8.2 Relevant Legislation, Standards & Guidelines
8.4 Description of Existing Ecological Baseline Conditions
8.5 Evaluation of Habitats and Species of Ecological Importance
8.8 Impact Avoidance and Mitigation Measures
8.10 Environmental Monitoring and Audit Requirements
Table 8.1 : Summary of the
Methodology for Ecological Baseline Surveys
Table 8.2 : Ecological
Evaluation of Mangroves within Study Area of Tai O
Table 8.3 : Ecological
Evaluation of Marsh/Reedbed within Study Area of Tai O
Table 8.4 : Ecological
Evaluation of Mudflat within Study Area of Tai O
Table 8.5 : Ecological Evaluation
of Pond within Study Area of Tai O
Table 8.6 : Ecological
Evaluation of Woodland within Study Area of Tai O
Table 8.7 : Ecological
Evaluation of Plantation within Study Area of Tai O
Table 8.8 : Ecological
Evaluation of Shrubland within Study Area of Tai O
Table 8.9 : Ecological
Evaluation of Grassland within Study Area of Tai O
Table 8.10 : Ecological
Evaluation of Watercourse within Study Area of Tai O
Table 8.11 : Ecological
Evaluation of Agricultural Land within Study Area of Tai O
Table 8.12 : Ecological
Evaluation of Developed Area / Village within Study Area of Tai O
Table 8.13 : Ecological
Evaluation of Coastal
Area within Study Area of Tai O
Table 8.16a : Estimated
Habitat Loss caused by the Project
Technical Memorandum for the Environmental Impact Assessment Ordinance (Cap 499) (EIAO TM);
EIAO Guidance Note No. 6/2010;
EIAO Guidance Note No. 7/2010;
EIAO Guidance Note No. 10/2010;
EIAO Guidance Note No. 11/2010
Hong Kong Planning Standards and Guidelines Chapter 10 (HKPSG);
Forests and Countryside Ordinance (Cap 96) and its subsidiary legislation the Forestry Regulations;
Wild Animals Protection Ordinance (Cap 170);
Protection of Endangered Species of Animals and Plants Ordinance (Cap 586);
Country Parks Ordinance (Cap 208);
Marine Parks Ordinance (Cap 476);
Town Planning Ordinance (Cap 131);
PRC Regulations and Guidelines;
IUCN Red List Categories and Criteria;
United Nations Convention on Biodiversity (1992);
The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES).
Table 8.1 : Summary of the Methodology for Ecological Baseline Surveys
Survey Type |
Brief Methodology |
Survey Period * |
Habitat and Vegetation |
Habitat mapping and vegetation identification through ground truthing in major habitats. |
Monthly from May to October 2011 |
Bird |
Quantitative (point count and transect count method) and qualitative (recorded within the Study Area) survey including day and night surveys covering the wet season. |
Monthly from May to October 2011 |
Mammal |
Quantitative (active searching along the survey transect) and qualitative (recorded within Study Area); including day and night surveys covering the wet season. |
Monthly from May to October 2011 |
Herpetofauna |
Quantitative (active searching along the survey transect) and qualitative (recorded within Study Area); including day and night surveys covering the wet season. |
Monthly from May to October 2011 |
Butterfly |
Quantitative (point count and transect count method) and qualitative (recorded within Study Area) survey; including only day-time surveys covering the wet season. |
Monthly from May to October 2011 |
Odonates (i.e. Dragonfly and Damselfly) |
Quantitative (point count and transect count method) and qualitative (recorded within Study Area) survey; including only day-time surveys covering the wet season. |
Monthly from May to October 2011 |
Freshwater Aquatic Assemblage |
Active searching in freshwater streams,; using hand net and kick sampling; including only day-time surveys in the wet season. |
Two times in July and August 2011 |
Intertidal Assemblages |
1. Qualitative walk-through surveys; and 2. Quantitative surveys at 3 sites (three 100m belt transect at each site, ie at high, mid and low intertidal zones) |
28 July, 27 September 2011 & 31 October 2011 |
Subtidal Hard Bottom Assemblages (Coral) |
1. Qualitative spot dive checks; 2. Semi-quantitative (Rapid Ecological Assessment (REA) technique) |
26 September 2011 |
Subtidal Benthic Assemblages |
Quantitative grab sampling surveys at 6 sites (three stations at each site) |
15 September 2011 |
* this column showed the main
survey period. A verification survey was conducted in March 2015
Table 8.2 : Ecological Evaluation of Mangroves within Study Area of Tai O
Criteria |
Mangroves |
Naturalness |
Largely undisturbed and the mangrove stands in the MRA are recreated habitat. |
Size |
Mangroves were found in several locations including
the stands around the pond at Po Chue Tam, the stands around some abandoned
fish ponds in the northeast of the Study Area, the stands along the
intertidal riparian zones of Tai O Creek, the stands along the pond bunds of
the designated MRA and a large area to the north of Leung Uk Tsuen, with an
overall area of approximately 19.7 ha (6.6% of the total Study Area). |
Diversity |
Low floral diversity (20 plant species recorded) with moderate to high structural complexity due to the stilt roots of mangrove plants. Moderate terrestrial faunal diversity. |
Rarity |
Bird species of conservation interest included Little Egret Egretta garzetta, Great Egret Ardea modesta, Grey Heron Ardea cinerea, Striated Heron Butorides striatus, Black Kite Milvus migrans and White-throated Kingfisher Halcyon smyrnensis. |
Re-creatability |
This habitat can be readily re-created under the condition of proper sea level and flux. |
Fragmentation |
Fragmented. |
Ecological Linkage |
Most of the mangrove stands are linked to ponds and watercourse receiving intertidal influence, while in the north of Leung Uk Tsuen, this habitat is adjacent to a patch of reedbed and began to colonize the latter. |
Potential Value |
With a moderate to high potential value to increase in size if given sufficient time and proper sediment and tidal conditions. |
Nursery/ Breeding Ground |
Nil. |
Age |
Young. |
Abundance/ Richness of Wildlife |
High for birds, moderate for butterflies, and low for the other fauna groups. |
Overall Ecological Value |
Moderate to high. |
Table 8.3 : Ecological Evaluation of Marsh/Reedbed within Study Area of Tai O
Criteria |
Marsh/Reedbed |
Naturalness |
Largely undisturbed, mostly originated from abandoned fields and salt pans. |
Size |
Two patches of marsh were identified within the Study Area. One is to the north of Leung Uk Tsuen and the other to the north of Tai O Creek. The total area of this habitat was about 5.9 ha, accounting for 1.9% of the Study Area. |
Diversity |
Low to moderate floral diversity (31 plant species recorded) with low to moderate structural complexity. Moderate terrestrial faunal diversity. |
Rarity |
Bird species of conservation interest included Little Egret Egretta garzetta, Great Egret Ardea modesta, Cattle Egret Bubulcus coromandus, Striated Heron Butorides striatus, Black-crowned Night Heron Nycticorax nycticorax, Yellow Bittern Ixobrychus sinensis, Black Kite Milvus migrans, White-throated Kingfisher Halcyon smyrnensis and Greater Coucal Centropus sinensis. Reptile species of conservation interest included Tokay Gecko Gekko gecko andCheckered Keelback Xenochrophis piscator. Butterfly species of conservation interest included Magpie Flat Abraximorpha davidii. Odonate of conservation interest included Mortonagrion hirosei (recorded by AFCD). |
Re-creatability |
Able to be re-created under suitable hydrological conditions. |
Fragmentation |
Fragmented. |
Ecological Linkage |
Linked to adjacent mangrove and agricultural land. |
Potential Value |
Could be enhanced with the clearance of the mangrove seedlings in adjacent area and management of water levels, and therefore having the potential ability to support a variety of uncommon species (especially birds). |
Nursery / Breeding Ground |
Nil. |
Age |
Evolved since the cessation of salt-extraction activity, > 20 years. |
Abundance / Richness of Wildlife |
Moderate to high for all fauna groups. |
Overall Ecological Value |
Moderate to high. |
Table 8.4 : Ecological Evaluation of Mudflat within Study Area of Tai O
Criteria |
Mudflat |
Naturalness |
Largely natural but receiving human disturbances from nearby developed area. |
Size |
Approximately 5.6 ha, located in the sheltered area between Shek Tsai Po and Tai Chung in the Study Area. |
Diversity |
Low floral diversity (one plant species recorded) with low structural complexity. Mudflat generally supports high marine faunal diversity. |
Rarity |
Fauna species of conservation interest recorded in this habitat included Little Egret Egretta garzetta. |
Re-creatability |
Able to be re-created under suitable hydrological conditions. |
Fragmentation |
Not fragmented within the Study Area. |
Ecological Linkage |
Not functionally linked to any highly valued habitat in close proximity. |
Potential Value |
Could be enhanced with active clearance of the mangrove seedlings. |
Nursery/ Breeding Ground |
Mudflat recognised as an important nursery ground for marine organisms. |
Age |
Not applicable. |
Abundance/ Richness of Wildlife |
Low for all terrestrial fauna groups but mudflat recognised to support high abundance of marine organisms. |
Overall Ecological Value |
Moderate. |
Table 8.5 : Ecological Evaluation of Pond within Study Area of Tai O
Criteria |
Pond |
Naturalness |
The pond at Po Chue Tam had artificial bank and the others originated from abandoned fish ponds, fields and salt pans. |
Size |
Located at Po Chue Tam, north of Tai O Creek, the MRA and west of Buddhist Fat Ho Memorial School and some small and isolated ponds near village houses and agricultural lands, with an overall area of approximately 15.5 ha (5.2% of the total Study Area). |
Diversity |
Low floral diversity (25 plant species recorded). Low terrestrial faunal diversity. |
Rarity |
Plant species of conservation interest Wild Sensitive-plant Chamaecrista leschenaultiana. Fauna species of conservation interest recorded in this habitat included Little Egret Egretta garzetta and Striated Heron Butorides striatus, |
Re-creatability |
Could be re-created. |
Fragmentation |
Fragmented except for the continuous abandoned fish ponds to the north of Tai O Creek |
Ecological Linkage |
Linked to adjacent mangrove and agricultural land. |
Potential Value |
Would change into marsh or mangrove habitat given sufficient time and left the area without active management. |
Nursery/ Breeding Ground |
Nil. |
Age |
Over 30 years. Some fishponds have probably been abandoned for about 10 years |
Abundance/ Richness of Wildlife |
Low for all fauna groups. |
Overall Ecological Value |
Low to moderate. |
Table 8.6 : Ecological Evaluation of
Criteria |
|
Naturalness |
Dominated by native plants with limited disturbances. |
Size |
Patches of woodland were found in foothills and ravines of Fu Shan, Sze Shan and Tsim Fung Sha, behind villages of Fan Kwai Tong Tsuen, Nam Chung Tsuen, Leung Uk Tsuen, Hang Mei Tsuen and Wang Hang Village and at a small elevated area at Po Chue Tam behind the Yeung Hau Temple; the largest habitat with an overall area of approximately 103.9 ha (34.7% of the total Study Area). |
Diversity |
Moderate to high floral diversity (86 plant species recorded) with high structural complexity. Moderate faunal diversity. |
Rarity |
Bird species of conservation interest included Black Kite Milvus migrans, Greater Coucal Centropus sinensis, Lesser Coucal Centropus bengalensis and Collared Scops Owl Otus lettia; Reptile species of conservation interest, Tokay Gecko Gekko gecko. |
Re-creatability |
Habitat characteristics and species composition are relatively natural. In the absence of disturbance, it would take at least 30 years for the woodland to be re-created. |
Fragmentation |
The north patch is largely continuous, while the close canopy of the southern patches is often opened or chopped by built-ups. |
Ecological Linkage |
Functionally links to the shrubland and
grassland in close proximity. Largely
fell within the |
Potential Value |
With a high potential value to become mature woodland if given sufficient time and protection from disturbances such as hillfires. |
Nursery/ Breeding Ground |
Nil. |
Age |
> 30 years based on tree size, woodland structure and species composition. |
Abundance/ Richness of Wildlife |
Moderate to high for birds, butterflies and odonates; low for the other fauna groups. |
Overall Ecological Value |
Moderate to high. |
Table 8.7 : Ecological Evaluation of
Criteria |
|
Naturalness |
Man-made habitat, dominated by exotic trees and shrubs. |
Size |
The total area of this habitat is approximately 1.9 ha (0.6% of the total Study Area). |
Diversity |
Moderate floral diversity (47 plant species recorded) with low structural complexity in the light of uniform tree height and absence of mid and understorey vegetation. Low faunal diversity. |
Rarity |
Two bird species of conservation interest, Little Egret Egretta garzetta, Black Kite Milvus migrans. |
Re-creatability |
For the plantation woodland along northern hillsides, it would take about 10 years for the trees to be re-created. For the plantation along |
Fragmentation |
Fragmented. |
Ecological Linkage |
Not functionally linked to any highly valued habitat in close proximity. |
Potential Value |
Generally low, but low to moderate for the plantation behind San Tsuen through colonization by native species if given sufficient time and protection from disturbances. |
Nursery/ Breeding Ground |
Nil. |
Age |
5 - 10 years. |
Abundance/ Richness of Wildlife |
Low for all fauna groups. |
Overall Ecological Value |
Low. |
Table 8.8 : Ecological Evaluation of Shrubland within Study Area of Tai O
Criteria |
Shrubland |
Naturalness |
Semi-natural habitats mainly covered by native species. |
Size |
Always adjacent to woodland with an overall area of approximately 60.7 ha (20.3% of the total Study Area). |
Diversity |
Moderate diversity of plants (62 species) with moderate structural complexity. Low to moderate faunal diversity. |
Rarity |
One bird species of conservation interest, Black Kite Milvus migrans. |
Re-creatability |
In the absence of disturbance, it would take at least 5 years for the shrubland to be re-created. |
Fragmentation |
Mainly existed as continuous patches and surrounded by woodland, grassland or developed area. |
Ecological Linkage |
Not functionally linked to any highly valued habitat,
bordering woodland in close proximity.
Largely fell within the |
Potential Value |
Low to moderate to become mature shrubland and then young woodland if given sufficient time and protection from disturbance. |
Nursery/ Breeding Ground |
Nil. |
Age |
5 - 8 years. |
Abundance/ Richness of Wildlife |
Moderate for butterflies and birds, low for the other fauna groups. |
Overall Ecological Value |
Low to moderate |
Table 8.9 : Ecological Evaluation of Grassland within Study Area of Tai O
Criteria |
Grassland |
Naturalness |
Natural succession would be frequently impeded by disturbances such as hill fires. |
Size |
The total area of this habitat is approximately 22.7 ha (7.6% of the total Study Area). |
Diversity |
Relatively low diversity of plants (32 species) with low structural complexity. Low faunal diversity. |
Rarity |
One bird species of conservation interest, Black Kite Milvus migrans. |
Re-creatability |
Readily re-creatable. |
Fragmentation |
Mainly concentrated in the upland area of Fu Shan and Sze Shan, generally not fragmented. |
Ecological Linkage |
Not functionally linked to any highly valued habitat,
bordering woodland and shrubland located at lower levels. Largely fell within the |
Potential Value |
Subject to practice of management and level of disturbance (e.g. hill fires). |
Nursery/Breeding Ground |
Nil. |
Age |
Very young. |
Abundance/Richness of Wildlife |
Low to moderate for birds and butterflies; low for the other fauna groups. |
Overall Ecological Importance |
Low. |
Table 8.10 : Ecological Evaluation of Watercourse within Study Area of Tai O
Criteria |
Watercourse |
Naturalness |
Upstream (freshwater section): generally natural. Middle and down stream (subject to tidal influence): subject to a certain degree of channelisation or bank reinforcement. |
Size |
Total area of this habitat is 8.1 ha, accounting for 2.3% of the total Study Area |
Diversity |
Low to moderate diversity of plants (27 species) given its small area. Low terrestrial fauna diversity, moderate for freshwater fauna (esp. for fishes). |
Rarity |
Two bird species of conservation interest, Little Egret Egretta garzetta and Grey Heron Ardea cinerea. |
Re-creatability |
Moderate re-creatability, the characteristic of natural stream banks and stream bed can be recreated through the incorporation of ecologically friendly stream design |
Fragmentation |
Not applicable. |
Ecological Linkage |
The upstream section linked to adjacent woodland; the middle and down stream sections not functionally linked to any highly valued habitat. |
Potential Value |
Upstream: moderate in general if provided with sufficient time to allow more aquatic species to establish and protection from disturbance; Middle and down stream: low ecological potential expect the estuary area. |
Nursery/Breeding Ground |
Nil. |
Age |
Not applicable. |
Abundance/Richness of Wildlife |
Moderate for freshwater assemblage, low for the other fauna groups. |
Overall Ecological Importance |
Moderate for the freshwater upstream section Low to moderate for the middle and downstream. |
Table 8.11 : Ecological Evaluation of Agricultural Land within Study Area of Tai O
Criteria |
Agricultural Land |
Naturalness |
Man-made habitat although the patch at Hang Mei was abandoned. |
Size |
Two patches of agricultural lands identified at Hang Mei in the east and adjacent to a large patch of marsh in the north, with an overall area of approximately 2.6 ha (0.9% of the total Study Area). |
Diversity |
Low to moderate diversity of plants (29 species) given its small area. Low fauna diversity. |
Rarity |
One plant species of conservation interest, Aubert’s Blyxa Blyxa aubertii. |
Re-creatability |
Readily re-creatable. |
Fragmentation |
Isolated within the Study Area. |
Ecological Linkage |
In close proximity to marsh and woodland, but not functionally linked to any highly valued habitat. |
Potential Value |
Highly depending on the management practice of land owners, e.g. wet agricultural land often has higher ecological value due to the comparatively high diversity of fauna it supports. |
Nursery/Breeding Ground |
Nil. |
Age |
Not applicable. |
Abundance/Richness of Wildlife |
Low to moderate to odonates; low to all the other fauna groups. |
Overall Ecological Importance |
Low. |
Table 8.12 : Ecological Evaluation of Developed Area / Village within Study Area of Tai O
Criteria |
Developed Area/Village |
Naturalness |
Man-made habitat dominated by ornamental trees and fruit trees. |
Size |
Including all built-up areas and wastelands with an overall area of approximately 48.7 ha (16.3% of the total Study Area). |
Diversity |
Moderate to high floral diversity (101 plant species recorded). Moderate faunal diversity. |
Rarity |
Bird species of conservation interest included Little Egret Egretta garzetta. Black Kite Milvus migrans, White-throated Kingfisher Halcyon smyrnensis and Greater Coucal Centropus sinensis. One mammal species of an unidentified bat. Two butterfly species Grass Demon Udaspes folus and Danaid Egg-fly Hypolimnas misippus. |
Re-creatability |
Readily re-creatable. |
Fragmentation |
Continuously present along both sides of Tai O Creek as well as the lowland area long coastline; some small and isolated areas of public facilities were located at hillsides. |
Ecological Linkage |
Not functionally linked to any highly valued habitat, but bordering nearly all of the other habitats within the Study Area. |
Potential Value |
Low. |
Nursery/Breeding Ground |
Nil. |
Age |
Not applicable. |
Abundance/Richness of Wildlife |
Moderate to high for birds, moderate for butterflies, odonates and herpetofauna, low for mammals. |
Overall Ecological Importance |
Low to moderate. |
Table 8.13 : Ecological Evaluation of Coastal Area within Study Area of Tai O
Criteria |
Natural Rocky Shore |
Artificial Shoreline |
|
Naturalness |
Natural, largely undisturbed moderately-exposed rocky shores |
Artificially constructed seawall |
Natural, largely undisturbed |
Size |
The total length of the natural rocky shore in the Study Area is about 2km and is one of the predominant habitat type in the 500m Study Area. |
The total length of the artificial seawall is about 20 to 30m which is not the predominant habitat type in the 500m Study Area. |
The total length of the boulder / sandy shore is 1.5km which is one of the predominant habitat types in the 500m Study Area. |
Diversity |
Low.
The intertidal assemblages of the natural shore comprise of typical
biota of moderately-exposed rocky shores in |
Very low. Intertidal organisms were only found at the low-shore region on the artificial seawall. |
Low.
The intertidal assemblages of the natural shore comprise of typical
biota of sheltered shores in |
Rarity |
No species recorded are considered rare or of recognised conservation interest |
No species recorded are considered rare or of recognised conservation interest |
Fauna species of recognised conservation interest included Little Egret Egretta garzetta and Grey-tailed Tattler Tringa brevipes |
Re-creatability |
Hard bottom substrata may be re-colonised by intertidal and subtidal organisms |
Hard bottom artificial seawall may be re-colonised by intertidal and subtidal organisms |
Soft bottom substrata may be re-colonised by intertidal and subtidal organisms |
Fragmentation |
Unfragmented |
The surrounding coastlines are composed natural rocky shores |
The surrounding coastlines are composed natural rocky shores |
Ecological linkage |
The habitat is not functionally linked to any high value habitat in a significant way. Generally linked with the open sea. |
The habitat is not functionally linked to any high value habitat in a significant way. Generally linked with the open sea. |
The habitat is not functionally linked to any high value habitat in a significant way. Generally linked with the open sea. |
Potential value |
Low. Unlikely to become an area of conservation value. |
Very low. This artificial habitat does not support any intertidal organisms. Unlikely to become an area of conservation value. |
Low. Unlikely to become an area of conservation value. |
Nursey / breeding ground |
Not identified during the literature review or field surveys |
Not identified in the literature review or field surveys |
Not identified in the literature review or field surveys |
Age |
n/a |
The artificial seawall has been in place for decade |
n/a |
Abundance / Richness of wildlife |
Low, and generally abundant in typical intertidal
assemblages found in moderately-exposed shores in |
Very low and generally occupied by very typical intertidal assemblages |
Low, and generally abundant in typical
intertidal assemblages found in sheltered shores in |
Summary |
Diversity and abundance of intertidal
species are low and they are typical among moderately-exposed rocky shores of
|
Diversity and abundance of intertidal species on artificial seawall are very low |
Diversity and abundance of intertidal
species are low and they are typical among sheltered shores of |
Ecological Importance |
Low-Moderate |
Low |
Low-Moderate |
Note:
1) n/a Not applicable
Table 8.14 : Ecological Evaluation of the Subtidal and Marine Waters Habitats of the Study Area of Tai O
|
Subtidal Hard Bottom Habitat |
Subtidal Soft Bottom Habitat |
Marine Waters Habitat |
Naturalness |
Natural and largely undisturbed |
Habitat in the vicinity of the Study Area is potentially affected by fishing activities, anchoring and regional water pollution to some extent |
Natural and largely undisturbed |
Size |
Habitat is large in extent |
Large in extent. Nearly all subtidal areas in the vicinity of the Study Area is comprised of soft-bottom habitat |
Large in extent. Cover all areas with hard bottom and soft bottom subtidal habitats inside and in the vicinity of the Study Area |
Diversity |
The assemblages are of low diversity
compared to other areas in the |
Assemblages are considered to be of low
diversity when compared with other areas in |
In general the diversity lower than the oceanic
eastern |
Rarity |
Gorgonian Echinomuricea sp. and ahermatypic cup coral Balanophyllia sp. which were commonly found in |
No organisms recorded in the area that were considered to be rare or of recognised conservation interest |
No rare organisms in the area. CWD are common in |
Re-creatability |
Habitat is re-creatable. Benthic organisms including corals may recolonise disturbed seabed area |
Subtidal soft bottom habitats can be easily re-created. Benthic organisms may recolonise the disturbed seabed area within a relatively short time |
No precedent case |
Fragmentation |
Low. Subtidal hard bottom habitat from long continuous expanses along the margins of neighboring rocky coasts |
The habitat is not fragmented |
The habitat is not fragmented |
Ecological linkage |
The habitat is generally linked with the open sea and is not functionally linked to any high value habitat in a significant way |
The habitat is not functionally linked to any high value habitat |
Connect with other marine waters |
Potential value |
Low. Development and growth of coral colonies constrained by estuarine environment |
Low. Subtidal soft bottom epifaunal
assemblages are unlikely to develop into habitat of
conservation value |
Low. |
Nursery/ |
Breeding/nursery ground for marine species |
No significant records identified in the literature review or field survey |
Part of the nursery grounds for dolphins |
Age |
n/a |
The sediments in the habitats are constantly accreting and eroding and the fauna present there are typically short-lived |
n/a |
Abundance/ Richness of wildlife |
Low. A sparse cover (<5%) of ahermatypic cup corals and octocorals were recorded. In comparison to parts of the southern waters, the hard and octocoral assemblages are of low abundance |
The assemblage at the habitat in the
Study Area is of low abundance compared with other areas in |
High for CWD. |
Summary |
The subtidal hard-bottom habitat is
supports a low diversity and abundance of benthic species which are common
and widespread within |
Subtidal soft bottom habitats within the
Study Area are disturbed to some extent by fisheries, anchoring and
pollution. Epibenthic faunal assmblages are in low abundance and diversity in
comparison with other areas in |
The ecological values of marine waters in
western |
Ecological Importance |
Low |
Low |
Generally High due to the presence of CWD, but
lower in some fringe areas such as the near shore shallow areas where CWD are
seldom present. |
Note:
1) n/a Not applicable
Table 8.15 : Evaluation of Species of
Conservation Importance recorded within
Study Area of Tai O during
Ecological Baseline Surveys
Species |
Location and Activities (if any) |
Protection Status |
Distribution |
Commonness in HK |
Plant |
||||
Wild Sensitive-plant Chamaecrista leschenaultiana |
On the grassy bund of a small abandoned fish pond along the southern side of Tai O Road |
- |
Previously recorded in Ngong Ping. |
Rare. |
Aubert’s Blyxa Blyxa aubertii |
In a small pool associated with the northern active agricultural land. |
- |
Previously recorded in Tai O and Sai Keng. |
Rare. |
Mammal |
||||
Unidentified Bat |
- |
Listed in
Wild Animals Protection Ordinance (Cap. 170) |
- |
- |
Chinese White Dolphin Sousa
chinensis |
Commonly present year-round in the waters north and west of Lantau. |
WAPO (Cap
170); Cap. 586; CITES:
Appendix I; IUCN
(2015): Near Threatened; China
Species Red List: Endangered |
Individuals
in the western Hong Kong waters forming part of the population in the Pearl
River Estuary. |
Common in
the Western Hong Kong waters |
Birds* |
||||
Little Egret Egretta
garzetta |
Perched at or flew over many
habitats including grassland, plantation, shrubland, woodland, developed
area, coastal area, marsh/reed bed and mangrove. |
Fellowes et al. (2002):
PRC, (RC) |
Widely distributed in coastal area throughout Hong Kong |
Common resident |
Great Egret Ardea
modesta |
Heard calling in the marsh/reed bed
and mangrove habitats |
Fellowes et al. (2002):
PRC, (RC) |
Widely distributed in Hong Kong |
Common resident and a winter visitor |
Cattle Egret Bubulcus
coromandus |
Calling was heard in the marsh/reed bed habitat |
Fellowes et al. (2002):
(LC) |
Widely distributed in Hong Kong |
Resident and a common passage migrant |
Grey Heron Ardea
cinerea |
Calling was heard in the watercourse and mangrove habitats |
Fellowes et al. (2002): PRC |
Deep Bay area, Starling Inlet, Kowloon Park and Cape D’Aguilar |
Common winter visitor |
Striated Heron Butorides
striatus |
Calling heard in the pond, marsh/reed bed and mangrove habitats |
Fellowes et al. (2002): (LC) |
Widely distributed in Hong Kong |
Present all year round; however it is uncommon in summer and
scarce in winter |
Black-crowned Night Heron Nycticorax
nycticorax |
Calling was heard in the mash/reed bed habitat |
Fellowes et al. (2002): (LC) |
Widely distributed in Hong Kong |
Common resident and winter visitor |
Yellow Bittern Ixobrychus
sinensis |
Calling was heard in the mash/reed bed habitat |
Fellowes et al. (2002): (LC) |
Found in Deep Bay area, Chek Keng and Tai Long Wan |
Uncommon summer visitor and passage migrant |
Black Kite Milvus migrans |
Perched at or flew over many habitats including grassland, plantation, shrubland, woodland, developed area, coastal area, marsh/reedbed and mangrove. |
Appendix II of CITES; Class II Protected Animal of PRC; Protected under Protection of Endangered Species of Animals and Plants Ordinance (Cap. 586). |
Found in a wide variety of coastal and inland habitats, including small islands, sea-coasts, intertidal mudflat, fish ponds, reservoirs, landfills and grassy hillsides at all altitudes; East Eurasia |
Common and widespread. Resident and Winter Visitor. |
Grey-tailed Tattler Tringa
brevipes |
Recorded in coastal area within
the Study Area |
‘Near Threatened’ of the IUCN Red List; Fellowes et al. (2002): LC |
Found in Deep Bay area. |
Common passage migrant. |
White-throated
Kingfisher Halcyon smyrnensis |
Heard calling in the marsh/reed bed,
developed area and mangrove habitat |
Fellowes et al. (2002): (LC) |
Widely distributed in coastal areas throughout Hong Kong |
Common resident. |
Greater Coucal Centropus sinensis |
Calling heard at several spots in marsh/reedbed, woodland and developed area/village. |
Class II Protected Animal of PRC; Listed as ‘Vulnerable‘ in China Red Data Book. |
Resident throughout the Oriental region, apart from Taiwan, the Philippines and Sulawesi; Found in many types of habitats in Hong Kong. |
Common and widespread resident in Hong Kong. |
Lesser Coucal Centropus bengalensis |
Calling heard in the woodland at Shek Tsai Po. |
Class II Protected Animal in PRC; listed as ‘Vulnerable’ in China Red Data Book. |
Oriental and lives in South China; favoring shrub-and tree-covered hillsides. |
Common and Widely distributed in Hong Kong. |
Collared Scops Owl Otus bakkamoena |
Calling heard in the woodlands behind Wang Hang Village and Hang Mei Tsuen during the night survey |
Class II Protected Animal of the PRC; protected under Cap 586 in Hong Kong; Listed in Appendix II of CITES |
East and southeast Asia, resident in Southern and eastern China. |
Common resident. Widely distributed in shrubland throughout Hong Kong. |
Reptile |
||||
Tokay Gecko Gekko gecko |
Calling heard in the marsh near Leung Uk Tsuen and in woodland behind Wang Hang Village. |
Appendix I of CITES; Class II Protected Animal in PRC; listed as ‘Endangered’ in China Red Data Book. |
Rocky areas surrounded by thick bush or forest |
Recorded in Tung Chung and Sham Wat on Lantau Island, Lion Rock Country Park |
Checkered Keelback Xenochrophis
piscator |
Showed up above the water surface in the reedbed near Leung Uk Tsuen during night survey |
Appendix III of CITES |
Marsh/Reed bed |
Widely distributed in streams in the New Territories and Lantau Island. |
Butterfly |
||||
Grass Demon Udaspes folus |
Found flying near developed area |
- |
Widely distributed in agricultural field throughout Hong Kong |
Rare |
Magpie Flat Abraximorpha davidii |
Observed in marsh/reed bed |
- |
Widely distributed throughout Hong Kong |
Rare |
Small Cabbage White Pieris rapae |
Flying in coastal area |
- |
Shep Mun Kap, Fan Lau, Ngong Ping, Kam Tin, Ho Chung, Luk Keng, Tuen Mun Ash Lagoon |
Rare |
Danaid Egg-fly Hypolimnas
misippus |
Developed area/village habitat |
Fellowes et al. (2002): LC |
Found in Ngau Ngak Shan, Lung Kwu Tan, Hong Kong Wetland Park, Mount Parker, Cloudy Hill, Lin Ma Hang |
Uncommon |
Dragonfly |
||||
Mortonagrion hirosei |
Recorded by AFCD. |
IUCN: near-threatened; Fellowes et al. (2002): GC |
Double Island, Luk Keng, Mai Po Marshes, Nam Chung, Sam A Tsuen and Sha Po |
Common |
Sub-tidal |
||||
Gorgonian Echinomuricea sp. |
Subtidal hard bottom habitat between -2 to -4m CD |
-- |
|
Common |
Ahermatypic cup coral Balanophyllia sp. |
Subtidal hard bottom habitat between -2 to -4m CD |
Protection of Endangered Species of Animals and Plants Ordinance (Cap. 586) |
|
Common |
Note:
* All birds in
Expansion, improvement and upgrading of the existing sewage system at Tai O to provide new sewerage to unsewered areas at Tai O;
Construction of new Fan Kwai Tong and Hang Mei Sewerage Pumping Station (SPS) and the associated rising mains;
Expansion of the existing Tai O Sewage Treatment Works;
Construction of a new submarine sewage outfall of 300mm diameter and 130m long at Tai O STW; and
a new sewerage system and some effluent reuse facilities.
Construction Phase – Direct Impacts
Terrestrial
Marine
Construction Phase – Indirect Impacts
Terrestrial
Marine
Dredging for the construction of submarine outfall;
Seawall construction;
Reclamation filling behind seawall;
Construction site runoff; and
Wastewater from construction activities
Table 8.16a : Estimated Habitat Loss caused by the Project
Project Elements |
Permanent Loss (ha) |
Temporary Disturbance (ha) |
||||
Developed area / village |
Intertidal rocky shore |
Subtidal habitat |
Developed area / village |
|
Subtidal habitat |
|
Proposed Upgraded Tai O STW |
0.24 |
83 m |
0.26 |
|
|
1.1 |
Proposed Sewage Pumping Station |
0.03 |
|
|
|
|
|
Proposed Sewer |
|
|
|
0.46 |
|
|
Proposed Rising |
|
|
|
0.19 |
|
|
Temporary Works Area |
|
|
|
0.37 |
0.04 |
|
Total |
0.27 |
83 m |
0.26 |
1.02 |
0.04 |
1.1 |
Table 8‑16b Potential direct
ecological impacts to habitats in the Project Area
Criteria |
Developed area / village |
Plantation |
Intertidal habitat |
Subtidal habitat |
Habitat Quality |
Low to Moderate |
Low |
Low to Moderate |
Low |
Species |
Very low flora and fauna diversity; No flora or fauna species of conservation
importance |
Very low flora and fauna diversity; No flora or fauna species of conservation
importance |
Very low flora and fauna diversity; No flora or fauna species of conservation
importance |
Very low flora and fauna diversity; No flora or fauna species of conservation
importance |
Size/ Abundance |
Very small |
Very small |
Very small |
Very small |
Duration |
Permanent loss: 0.27ha Temporary loss: 1.02ha |
Temporary loss: 0.04ha |
Permanent loss: 83m of rocky shore |
Permanent loss: 0.26ha Temporary loss: 1.1ha |
Reversibility |
Habitat loss would be permanent and irreversible. |
Habitat loss would be temporary |
Habitat loss would be permanent and irreversible. |
Habitat loss would be permanent and irreversible. |
Magnitude |
Insignificant |
Insignificant |
Insignificant |
Insignificant |
Overall Impact Severity |
Insignificant |
Insignificant |
Insignificant |
Insignificant |
Construction Phase – Recognised Sites of Conservation Importance
Construction Phase – Impact to Species of Conservation Importance
Operation Phase – Direct Impacts
Operation Phase – Indirect Impacts
Operation Phase – Impact to Site of Conservation Importance
Operation Phase – Impact to Species of Conservation Importance
Impact |
Source |
Receiver |
Nature of Impacts |
Significance of an ecological impact |
Mitigation Required |
|||||
|
|
|
Habitat quality |
Species affected |
Size-abundance |
Duration |
Reversibility |
Magnitude |
|
|
Construction
phase |
||||||||||
Terrestrial habitat loss |
Temporary Works Area |
|
Low |
Common flora and fauna species |
0.04 ha |
Temporary |
Reversible |
Small |
Insignificant |
No |
|
Proposed Upgraded Tai O STW, Fan Kwai Tong and Hang Mei Sewage
Pumping Stations, Sewer, Rising Main and Temporary Works Area |
Developed area/village |
Low to moderate |
Disturbance tolerant fauna |
1.29 |
Permanent: 0.27 ha; Temporary: 1.02 ha |
Irreversible for permanent loss; temporary works areas can be
reinstated |
Small |
Insignificant |
No |
Terrestrial noise and dust |
Proposed Upgraded Tai O STW, Sewage Pumping Station, Sewer, Rising |
Area adjacent to the works areas |
Terrestrial habitats affected are mostly of low ecological
importance, but the construction works of Hang Mei SPS and Proposed Upgraded
Tai O STW might affect woodland habitat of moderate to high ecological
importance, Also some sections of sewer alignments will be adjacent to habitats
of moderate to high ecological importance, including mangrove and
marsh/reedbed |
Organisms adjacent to the works areas, mostly common and disturbance
tolerant species |
Low |
Temporary |
Reversible |
Small |
Minor to moderate for the construction works of Hang Mei SPS and
Proposed Upgraded Tai O STW due to potential disturbance to woodland habitats
and associated wildlife Minor for other construction works |
Yes for the construction works of Hang Mei SPS and Proposed Upgraded
Tai O STW. Hoardings of 3m tall will be erected along the boundary of the
works areas. Uses of quiet machinery/construction method Good site practice will be implemented at all construction sites to
minimize the impact for all construction works |
Potential water quality
impacts |
Land works including site
runoff, sewage from workforce and wastewater from various construction
activities, and accidental spillage |
Tai O Creek, mangroves, marsh/reedbed, subtidal habitat |
Low for subtidal habitats, moderate to high for mangroves and marsh/reedbed, Tai O Creek: moderate for upstream section, low to moderate for
middle and downstream section |
Common aquatic life |
Low |
Temporary |
Reversible |
Small |
Minor to moderate for Mortonagrion
hirosei Moderate for other aqutic life |
Yes, good site practice will be implemented to minimize the impact |
Intertidal habitat loss |
Proposed Upgraded Tai O STW |
Intertidal rocky shore |
Low – moderate |
Common intertidal organisms |
83 m |
Permanent |
Irreversible |
Small |
Insignificant |
No |
Seabed loss and loss of dolphin habitat above the seabed |
Proposed Upgraded Tai O STW |
Subtidal habitat |
Low |
Common benthic organisms; Gorgonians and ahermatypic corals; and Chinese White Dolphin |
1.36 ha |
Permanent: 0.26 ha; Temporary: 1.1 ha |
Irreversible for the 0.26 ha reclamation footprint, reversible for the 1.1 ha
temporary loss from dredging and works area. |
Small |
Insignificant |
No |
Marine water quality |
Reclamation and seawall construction works for the proposed Tai O
STW; and dredging works for submarine outfall |
Marine and coastal fauna in the nearby waters |
Moderate for dolphin; Low for gorgonians, ahermatypic corals and benthic organisms No
horseshoe crab recorded |
Chinese White Dolphin gorgonians, ahermatypic corals and benthic organisms |
Moderate for dolphin Low for gorgonians, ahermatypic corals and benthos |
Temporary |
Reversible |
Medium |
Minor to moderate |
Yes, There would be water quality mitigation measures; closed grab dredgers and installing cage type silt curtains |
Marine noise |
Reclamation and seawall construction works for the proposed Tai O
STW; and dredging works for submarine outfall |
Nearby waters |
Moderate |
Chinese White Dolphin |
Moderate |
Temporary |
Reversible |
Medium |
Moderate |
Yes, Decoupling of noisy equipment on vessels and establishment of
dolphin exclusion zone |
Marine traffic during construction |
Reclamation and seawall construction works for the proposed Tai O
STW; and dredging works for submarine outfall |
Nearby waters |
Moderate |
Chinese White Dolphin |
Moderate |
Temporary |
Reversible |
Small |
Moderate |
Yes, Set up regular routes for vessels to avoid dolphin hotspots;
vessel speed limits |
Spillage of oil or chemicals |
Vessels working in the area |
Nearby waters |
Moderate |
Chinese White Dolphin gorgonians, ahermatypic corals and benthic organisms |
Moderate |
Temporary |
Reversible |
Small |
Insignificant due to the small volume of oil and chemicals involved |
No |
Operation phase |
||||||||||
Habitat loss |
Sewerage facilities |
Developed area/village, subtidal habitat and rocky shore |
Low for subtidal habitat, low to moderate for developed area/village
and rocky shore |
Mostly common and disturbance tolerant species |
0.27a of developed area/village, 0.26ha subtidal habitat, 83m of
rocky shore |
Permanent |
Irreversible |
Low |
Insignificant |
No |
Noise from pumping stations and sewage treatment works |
Operation of sewerage facilities |
Surrounding habitats |
Mainly developed area/village, which is of low to moderate ecological
value |
Mostly disturbance tolerant species |
Small areas adjacent to the pumping stations and sewage treatment
works as noise is expected to be low |
Permanent |
Irreversible |
Low |
Insignificant |
No |
Marine water quality |
Sewage overflow from the SPS during pump failure, power supply
failure, and damage to pressure main or flooding |
Nearby waters |
Moderate for dolphin; Low for gorgonians, ahermatypic corals and benthic organisms |
Chinese White Dolphin gorgonians, ahermatypic corals and benthic organisms |
Moderate for dolphin Low for gorgonians and benthos |
Temporary |
Reversible |
Medium |
Insignificant |
Provision of standby power to secure electricity supply, and
provision of standby pumps as precautionary measures |
Tai O Creek |
Sewage overflow from the Hang Mei SPS during pump failure |
Aquatic habitats downstream of the emergency outfall |
Low |
Pollution tolerated aquatic species, mostly common species |
Low |
Temporary |
Reversible |
Small |
Insignificant |
Provision of standby pump and power supply, alarm system to reduce
the possibility of emergency bypass of sewage, as stated in Water Quality
Chapter |
Habitat fragmentation |
Operation of sewerage facilities |
Non-volant fauna |
Terrestrial habitats affected are mostly of low ecological importance |
Non-volant fauna, mostly disturbance tolerant |
Low |
Permanent |
Irreversible |
Minimal |
Insignificant as the operation of the sewerage facilities will not
cause habitat discontinuities |
No |
https://www.afcd.gov.hk/english/conservation/con_mar
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AECOM. (2010). Agreement No. 31/2007. Upgrading of Cheung Chau and Tai O Sewage Collection, Treatment and Disposal facilities – Investigation. Tree Survey, Felling, Transplanting and Landscaping Plan for Tai O. Final. Submitted to Drainge Services Department. September 2010.
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CEDD 2005.EIA-109/2005 Road P1 Advance Works at Yam O on Lantau Island.
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