doi:

DOI: 10.3724/SP.J.1245.2014.00255

Asian Herpetological Research 2014/5:4 PP.255-262

Food Habits and Distribution of the Lake Taal Sea Snake(Hydrophis semperi Garman 1881) and the Sympatric Little File Snake(Acrochordus granulatus Schneider 1799) in Lake Taal, Philippines


Abstract:
Our knowledge about the food habits of sea snakes and how it is associated with their distribution has seen much development through its description across a number of species available through published literature except for the key threatened species such as Hydrophis semperi. This paper aims to describe the food habits of H. semperi through gut content and stable isotope analyses. We also compared data with the Little File Snake, Acrochordus granulatus, sympatric with H. semperi. Recorded captures of H. semperi suggest that the sea snake tends to occur in the littoral zones and the shallower portions of the limnetic zone. Gut content analysis of H. semperi have shown that gobies and eels are primary prey items. Halfbeaks(Family Hemiramphidae) were recorded as one of the Lake Taal Sea Snake's prey items which is considered as a new prey record for sea snakes. These extracted gut contents are confirmed to be the temporal food preference of H. semperi given our detected stable isotope signatures. It appears that A. granulatus and H. semperi share common prey items suggesting possible diet overlap and resource competition. This study reports the first account of the endemic Lake Taal Sea Snake's distribution and food habits which poses implications towards its conservation as it occurs in a restricted ecosystem that has undergone considerable habitat alteration.

Key words:freshwater,diet,feeding,Hydrophis semperi,Hydrophiidae

ReleaseDate:2015-03-27 09:32:50



Alcala A. 1986. Guide to Philippine flora and fauna-amphibians and reptiles. Quezon City, Philippines: Ministry of Natural Resources and University of the Philippines

Barletta M., Blaber S. J. M. 2007. Comparison of fish assemblages and guilds in tropical habitats of the Embley (Indo-West Pacific) and Caete (Western Atlantic) estuaries. Bull Mar Sci, 80(3): 647-680

Carpenter C. C. 1958. Reproduction, young, eggs, and food of Oklahoma snakes. Herpetologica 14: 113-115

Dodd Jr. C. K. 1987. Status, conservation, and management. In Seigel R. A., Collins J. T., Novak S. S. (Eds.), Snakes: Ecology and evolutionary biology. New York: Macmillan Publishing Company

Dunson W., Minton S. 1978. Diversity, distribution, and ecology of Philippine marine snakes (Reptilia, Serpentes). J Herpetol, 281-286

Dunson, W. A. 1975. Adaptations of sea snakes. Baltimore, Maryland: University Park Press

France R. L., Peters, R. H. 1997. Ecosystem differences in the trophic enrichment of 13C in aquatic food webs. Can J Fish Aquat Sci, 54(6): 1255-1258

Fukumori K., Okuda N., Hamaoka H., Fukumoto T., Takahashi D., Omori K. 2008. Stable isotopes reveal life history polymorphism in the coastal fish Apogon notatus. Mar Ecol Prog Ser, 362: 279-289

Garman S. 1881. New and little-known reptiles and fishes in the museum collection. Bull Mus Comp Zool, III: 85

Gatus J. 2010. Hydrophis semperi. The IUCN red list of threatened species. Version 2014.1. Retrieved from http://www.iucnredlist.org/details/176747/0 18/7/2014

Glodek G. S., Voris H. K. 1982. Marine snake diets: prey composition, diversity and overlap. Copeia, 1982(3): 661-666

Hallare A. V., Factor P. A., Santos E. K., Hollert H. 2009. Assessing the impact of fish cage culture on Taal Lake (Philippines) water and sediment quality using the zebrafish embryo assay. Philipp J Sci, 138: 91-104

Heatwole H. F., Minton S. A., Taylor R., Taylor V. 1978. Underwater observations on sea snake behaviour. Rec Aust Mus, 31(18): 737-761Herre A. 1942. Notes on Philippine sea-snakes. Copeia, 7-9

Jardine T. D., McGeachy S. A., Paton C. M., Savoie M., Cunjak R. A. 2003. Stable isotopes in aquatic systems: Sample preparation, analysis, and interpretation. Can Manuscr Rep Fish Aquat Sci, 2656: 39

Lukoschek V., Beger M., Ceccarelli, D., Richards, Z., Pratchett, M. 2013. Enigmatic declines of Australia's sea snakes from a biodiversity hotspot. Biol Cons, 166(0): 191-202

Lillywhite H. B., Ellis T. M. 1994. Ecophysiological aspects of the coastal-estuarine distribution of Acrochordid snakes. Estuaries, 17(1): 53-61

Lobo A. S., Vasudevan K., Pandav B. 2005. Trophic ecology of Lapemis curtus (Hydrophiinae) along the western coast of India. Copeia, 2005(3): 637-641

McCosker J. E. 1975. Feeding behavior of Indo-Australian Hydrophiidae. Baltimore, Maryland: University Park Press

Minton S. A. 1975. Geographic distribution of sea snake. Baltimore, Maryland: University Park Press

Mushinsky H. R. 1987. Foraging ecology. In Seigel R. A., Collins J. T., Novak S. S. (Eds.), Snakes: Ecology and evolutionary biology. New York: MacMillan Publishing Company

Papa R. D. S., Zafaralla M. T., Eckmann R. 2011. Spatio-temporal variation of the zooplankton community in a tropical caldera lake with intensive aquaculture (Lake Taal, Philippines). Hydrobiologia, 664(1): 119-133

Perez T. E., Enriquez E. E., Guerrero III R. D., Simon D., Schiemer F. 2008. Catchment characteristics, hydrology, limnology and socio-economic features of Lake Taal, Philippines. In Schiemer F., Simon D., Amarasinghe U. S., Moreau (Eds.), Aquatic ecosystems and development: comparative Asian perspectives. Biology of Inland Waters Series. Leiden: Backhuys Publishers

Ramos E. G. 2002. Origin and geologic features of Taal Lake, Philippines. Aquatic Ecosystem Health and Management, 5(2): 155-162

Rezaie-Atagholipour M., Riyahi-Bakhtiari A., Sajjadi M. 2013. Feeding habits of the annulated sea snake, Hydrophis cyanocinctus, in the Persion Gulf. J Herpetol, 47(2): 328-330

Shibata J.-y., Karube Z. i., Oishi M., Yamaguchi M., Goda Y., Okuda N. 2011. Physical structure of habitat network differently affects migration patterns of native and invasive fishes in Lake Biwa and its tributary lagoons: stable isotope approach. Popul Ecol, 53(1): 143-153

Smith M. 1926. Monograph of the sea snakes (Hydrophiidae). London: British Museum of Natural History

Su Y., Fong S. C., Tu M. C. 2005. Food habits of the sea snake, Laticauda semifasciata. Zool Stud, 403-408

Tayasu I., Hirasawa R., Ogawa N., Ohkouchi N., Yamada K. 2011. New organic reference materials for carbon- and nitrogen-stable isotope ratio measurements provided by Center for Ecological Research, Kyoto University, and Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology. Limnology, 12(3): 261-266

Voris H. K. 1966. Fish eggs as the apparent sole food item for a genus of sea snake, Emydocephalus (Krefft). Ecology 47(1): 152-154

Voris H. K., Glodek G. S. 1980. Habitat, diet, and reproduction of the File Snake, Acrochordus granulatus, in the Straits of Malacca. J Herpetol, 14(1): 108-111

Voris H. K., Moffett M. W. 1981. Size and proportion relationship between the Beaked Sea Snake and its prey. Biotropica, 13(1): 15-19

Voris H. K., Voris H. H. 1983. Feeding strategies in marine snakes: an analysis of evolutionary, morphological, behavioral and ecological relationships. Am Zool, 23(2): 411-425

Voris H. K., Voris H. H., Liat L. B. 1978. The food and feeding behavior of a marine snake, Enhydrina schistose (Hydrophiidae). Copeia, 1978(1): 134-146

Zanden M. J. V., Rasmussen J. B. 1999. Primary consumer δ13C and δ15N and the trophic position of aquatic consumers. Ecology, 80(4): 1395-1404