| Citation |
Ledesma, M., Rico, E., Gonzalez, J.C., Brown, R., Murphy, J., Voris, H. & Karns, D. 2010. Cerberus microlepis. The IUCN Red List of Threatened Species 2010: e.T169827A6679261. http://dx.doi.org/10.2305/IUCN.UK.2010-4.RLTS.T169827A6679261.en. Downloaded on 21 May 2019. |
Description |
Geographic Range
NATIVE
Extant (resident)
Philippines
NUMBER OF LOCATIONS
1
UPPER ELEVATION LIMIT
200 metres
LOWER ELEVATION LIMIT
200 metres
UPPER DEPTH LIMIT
LOWER DEPTH LIMIT
Geographic Range in detail
ESTIMATED AREA OF OCCUPANCY (AOO) (KM²)
19
CONTINUING DECLINE IN AREA OF OCCUPANCY (AOO)
EXTREME FLUCTUATIONS IN AREA OF OCCUPANCY (AOO)
ESTIMATED EXTENT OF OCCURRENCE (EOO) (KM²)
19
CONTINUING DECLINE IN EXTENT OF OCCURRENCE (EOO)
EXTREME FLUCTUATIONS IN EXTENT OF OCCURRENCE (EOO)
CONTINUING DECLINE IN NUMBER OF LOCATIONS
EXTREME FLUCTUATIONS IN THE NUMBER OF LOCATIONS
RANGE DESCRIPTION
This species is endemic to the Philippines, where it has only been recorded from Lake Buhi (19 km²), on the Bicol Peninsula of Luzon (Murphy 2007). A few additional specimens were collected in the early 1990s, but there have been no other sightings since this time (R. Brown pers. comm. 2007). A number of freshwater fish species present in Lake Buhi have also been found in two small neighbouring lakes (including the protected Lake Manapao), and it is considered possible that C. microlepis may also be present here, although this needs confirmation. Lake Buhi lies at around 200 m elevation (Karns et al. 2000).
Population
CURRENT POPULATION TREND
Decreasing
NUMBER OF MATURE INDIVIDUALS
POPULATION SEVERELY FRAGMENTED
No
CONTINUING DECLINE OF MATURE INDIVIDUALS
Population in detail
EXTREME FLUCTUATIONS
NO. OF SUBPOPULATIONS
CONTINUING DECLINE IN SUBPOPULATIONS
EXTREME FLUCTUATIONS IN SUBPOPULATIONS
ALL INDIVIDUALS IN ONE SUBPOPULATION
NO. OF INDIVIDUALS IN LARGEST SUBPOPULATION
DESCRIPTION
There are currently no data available on the abundance of this species. It is considered fairly common within its limited range (J. Murphy pers. comm. 2009), however, its known distribution is a single lake (19 km²) that continues to experience habitat degradation due to human encroachment.
Habitat and Ecology
SYSTEM
Terrestrial, Freshwater (=Inland waters)
HABITAT TYPE
Wetlands (inland), Artificial/Aquatic & Marine
GENERATION LENGTH (YEARS)
CONGREGATORY
MOVEMENT PATTERNS
CONTINUING DECLINE IN AREA, EXTENT AND/OR QUALITY OF HABITAT
Yes
Habitat and Ecology in detail
HABITAT AND ECOLOGY
This is a poorly-known freshwater snake, possibly with similar ecological requirements to the congener C. rynchops. Very little information is available on the natural history of this species. Individuals of this species are sometimes removed from shallow water in fish ponds near Lake Buhi during the night (Murphy 2007). This species most likely uses the forest floor habitat surrounding the lake. It is also likely that this species can live in relatively disturbed and modified habitats.
CLASSIFICATION SCHEME
Habitats Suitability Major importance
5. Wetlands (inland) 5.3. Wetlands (inland) - Shrub Dominated Wetlands Marginal
5.5. Wetlands (inland) - Permanent Freshwater Lakes (over 8ha) Suitable Yes
15. Artificial/Aquatic & Marine 15.3. Artificial/Aquatic - Aquaculture Ponds Marginal
Threats
Agriculture & aquaculture
Annual & perennial non-timber crops
Biological resource use
Logging & wood harvesting
Fishing & harvesting aquatic resources
Pollution
Domestic & urban waste water
Threats in detail
THREATS
The area surrounding the lake is fairly densely populated by humans which has caused habitat degradation of the shores of the lake and decreased water quality. Much of the forest habitat around the lake has been cleared with little remaining forest in patchy, secondary growth. Another threat may include pollution from domestic waste causing habitat degradation. Direct persecution from humans is also a possible threat (J.C. Gonsalez pers. comm. 2009).
CLASSIFICATION SCHEME
Threats Timing Stresses Scope Severity Impact score Invasive species Virus
2. Agriculture & aquaculture 2.1. Annual & perennial non-timber crops 2.1.2. Small-holder farming Ongoing
1. Ecosystem stresses 1.1. Ecosystem conversion
1.2. Ecosystem degradation
Low Impact: 3
5. Biological resource use 5.3. Logging & wood harvesting 5.3.5. Motivation Unknown/Unrecorded Ongoing
1. Ecosystem stresses 1.2. Ecosystem degradation
Low Impact: 3
5.4. Fishing & harvesting aquatic resources 5.4.5. Persecution/control
2. Species Stresses 2.1. Species mortality
No/Negligible Impact: 0
9. Pollution 9.1. Domestic & urban waste water 9.1.3. Type Unknown/Unrecorded Ongoing
1. Ecosystem stresses 1.2. Ecosystem degradation
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