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Red Data FISHES as EIA INDICATORS:CASE STUDY IN THE GREATER MEKONG SUBREGION
Chavalit Vidthayanon
Wetland Project, WWF Thailand
Criteria in EIASpecies base: Red list, Economic, Endemic, Global/Local-National Redlist Status
Habitat base: Diversity Hotspot, Area of Endemism, Rare Ecosystem, Critical habitat of spp.
A species is THREATENED when the best available evidence indicates that it meets any of the criteria for either Critically Endangered, Endangered or Vulnerable.
Endangered (EN)
Considered to be facing a very high risk of extinction in the wild.
Vulnerable (VU)
Considered to be facing a high risk of extinction in the wild
Considered to be facing an extremely high risk of extinction in the wild
Critically Endangered (CR) วิ�กฤติ�
ใกล้�สูญพั นธุ์��
มี�แนวิโน�มีใกล้�สูญพั นธุ์��
A species that has been evaluated against the criteria and does not qualify for a threatened category and is not Extinct or Extinct in the Wild is either:
Least Concern (LC)
When it does not qualify for a threatened category or Near Threatened. Widespread and abundant taxa are included in this category.
Data Deficient (DD)
When there is inadequate information to make a direct, or indirect, assessment of its extinction risk.
Near Threatened (NT)
When it is close to qualifying for or is likely to qualify for a threatened category in the near future.
ใกล้�ถูกคุ�กคุามี
ไมี�ถูกคุ�กคุามี
ข้�อมีล้ไมี�เพั�ยงพัอ
A Population reduction
B Restricted geographic range
C Small population size & decline
Very small or restricted populationD
E Quantitative analysis
CRITERIA
Quantitative thresholds
THREATENED CATEGORIES
Critically Endangered (CR)
Endangered (EN)
Vulnerable (VU)
Nature of the Red List Criteria
Taxa and assemblages to be focused/ reassessment
IUCN 2004-07 S/SE Asian outdated taxa
Highly endemism/exploited areas
Troglobitic taxa
Highly exploited wild stocks, but never / rarely been captive breed
30 Coral reef spp.
14 estuarine spp.
60 Sharks and rays. 49 Bony fishes.
34 Involve in Life Reef Fish Trade
Thai Redlist Seafishes
Betta simplex
• Inhabits only few limestone swamps in Krabi Province, South. Thailand.• EOO less than 100 km2
• AOO < 10 km2 or location < 10• Occurrence declining continuously including habitat alteration• Continuously exploited for aquarium trades as well as local exploitation as baitfish
CR A1acd by Thai Country Evaluation, 2006IUCN Redlist 2004 as VU D2
Probarbus jullieni2007 Red List AssessmentEN EN A1ac ver 2.3 (1994) (out of date)
Over-evaluated case
Fact• Population/fishing record reduction observed less than 30%• Wide ranging over Mekong basinwide and Pahang basin• Genetic diversity show healthy populations in the Mekong• Captive bred carrying out, commercially
2007 Thai Red List AssessmentVU E
Population SizePopulation Size(mature individuals only)(mature individuals only)
SubpopulationsSubpopulations
PopulationPopulation
Lake Lanao’s PaitPuntius amarus
Last 10 years or 3 generations (whichever is longer)
90% Critically Endangered90% Critically Endangered
70% Endangered70% Endangered
50% Vulnerable50% Vulnerable
Present
Sub-criterion A1Observed, estimated, inferred or suspected past decline where causes of decline are understood, AND are reversible, AND have now ceased
80% Critically 80% Critically EndangeredEndangered
50% Endangered50% Endangered
30% Vulnerable30% Vulnerable
Last 10 years or 3 generations (whichever is longer)
Present
Sub-criterion A2Observed, estimated, inferred or suspected past decline where causes of decline may not be understood, OR may not be reversible, OR may not have ceased
Points to remember: CR EN VU
• extent of occurrence, EOO <100 km2 <5000 km2 < 20,000 km2
• area of occupancy. AOO <10 km2 <500 km2 < 2,000 km2
• Severely fragmentation
by number of fragments =1 < 5 < 10
• IUCN (2004: 73 spp.)– 1 EW– 3 Critical– 12 Endangered
–22 Vulnerables– 12 Near Threatened– 12 Lower Risk– 11 D ata Deficient
• OEPP (1998: 224 spp.)– 3 Extinct– 29 Endangered– 155 Vulnerables– 4 Threatened in the wild– 33 D ata Deficient
Threatening Status of Thai Fishes
Species bases
This Thai Categorizes: 273
1 Extinct, 2 Extirpated18 Critical42 Endangered
155 Vulneraaaad21 Near Threatened30 D ataDeficient11 Threatened in situ
IUCN (2006: 70 Thai Marine spp.)4 Critical (> 90% losses)3 Endangered (>60-90%)
22 Vulnerabled (>40-60%)24 Near Threatened (15-40%)13 Lower Risk 7 Data Deficient from www.redlist.org
Including 20 species in LRFTMost of sharks/rays and others are bycatch and habitat loss threats
Criteria for indicator• Sensitive species
– Endemic species – Specialist (stenotopic)
spp.
• Alien invasion • Fish anomalies
Habitat integrity – Existing of Keystone
species/Umbrella spp.– Can be use as Flagship
species
Sensitive species• Endemic species : good in
local base• Specialist (stenotopic)
spp. : good in habitat base
• Wide ranging taxa: best for all ranges and types
• Large/top predatory and trophic diversity: Ecosystem health and fish stocks
Habitat bases
• Habitat diversity– Habitat types/landscapes– Heterozygousity
• Species diversity and Taxonomic diversity
• Genetic diversity– Population sizes– Size compositions– Juveniles and spawners diversity
• Ethno-diversity– Ethno-fisheries– Socio-economic value– Fish ecosystem function and
services
• Taxonomic diversity– Fish in higher taxa– Aquatic fauna and
flora in higher taxa• Invertebrate phyla• Vertebrate taxa• Submerge and
riparian dominant vegetation
Biodiversity indices• Number of indigenous spp.• Stock of alien spp.• Relative % of tolerant and sensitive
spp.• % of trophic and habitat specialist• Incident of disease and anomalies• % of mature, large individuals• Reproduction of sensitive spp.• Number of size-, age-classes
20 hotspots of future Ramsar Sites potential
Cave fishes
FW Fish Significant
Coastal/marine habitats
Mekong Giant catfish
Endemic fishes
High diversity150-300 spp.
Good place to see indicator fishes: Local markets
Dominate replacement of farm/alien species indicate degradations of the wetlands: as well as abandon of local fishing gears/ knowledge
Over 27 Fishing methods
• Kut Ting 27 types• Bueng Khong Long 17 types
Ethno-Diversity
Over 25 types of fishing gears from hand collecting to larger barrages
6 Trophic diversity
Planktivores
Insectivores
Herbivores
Large piscivores
Small carnivores
Benthic feeders
insectivore
Herbivore
Larger piscivore
Small predator
Benthic carnivore
Benthic herbivore
Trophic diversity
Planktivores
Juvenile diversity
At least 70 spp. juveniles occurred
Over 30 species in 2 wetlands
Taxonomic Diversity
9 crustacean 18 mollusks11 FW reptiles 16 amphibians
Taxonomic Diversity
Kut Ting
Bueng Kong Long
Waterplant Vegetation profiles
Bio-indicator in Hillstreams
Sensitive taxa
Tolerant taxa
Ecological impact
Bio-indicator in
marshlands
Sensitive species
Tolerant species
Indicator in Mainstream rivers
Sensitive and larger species
Tolerant and small species
Fishing impact
Ecological impact
Mekong Delta Fish
68 families/>460 species80 cyprinids
70 Gobiids
70 catfishes
Estuaries-lower reaches Fish
Gobies diversity
mudskippers
Up to 70 species in the Delta
Bio-indicator in Estuaries
Sensitive and larger species
Tolerant/ alien species
Fishing impact
Ecological impact
Elasmobranches
Criteria for Red Data VS EIA• Thai/Over all population,
ranges ?• Refill opportunity ?• Sub population/subspecies?• Habitat health function
indicator• Ecosystem services
Socio-Economic Importance
: Fisheries
: Tourism
: Flagshipness
Sensitive species• Endemic species : Material
or non material value
• Specialist (stenotopic) spp. : Rare Ecosystem
• Wide ranging taxa: % of existing populations
• Large/top predatory and trophic diversity: Ecosystem health and stock indices
Mitigation process• No-take Zones designation
• Fishing regulation
• Breeding and restocking
• Translocate to Satellite habitats
• Habitat rehab.
• Habitat Zoning
• Modified Project
• Cancel project !!?
Local participation
base
Thank you
www.wwfthai.orgwww.wwfgreatermekong.org
www.siamensis.org
WWF-Canon/R. Kongmoung