Journal of Ecology and The Natural Environment
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Article Number - 6B3ABFC63783


Vol.9(4), pp. 53-61 , April 2017
DOI: 10.5897/JENE2016.0608
ISSN: 2006-9847



Full Length Research Paper

“Diet analysis of the African clawless otter (Aonyx capensis) in and around Lake Tana”



Engedasew Andarge*
  • Engedasew Andarge*
  • Department of Biology, College of Natural and Computational Sciences, Wolaita Sodo University, P. O. Box 138, Wolaita Sodo, Ethiopia.
  • Google Scholar
Tilaye Wube
  • Tilaye Wube
  • Department of Zoological Sciences, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia.
  • Google Scholar
Mundanthra Balakrishnan
  • Mundanthra Balakrishnan
  • Department of Zoological Sciences, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia.
  • Google Scholar







 Received: 11 September 2016  Accepted: 07 February 2017  Published: 30 April 2017

Copyright © 2017 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


The diet composition of the African clawless otter (Aonyx capensis) was studied by analyzing of 440 spraint samples collected during January, 2014 and December, 2015 in both dry and wet seasons from eight sites in and around Lake Tana, North West Ethiopia. Percentage frequency of occurrence and relative percentage frequency of diet items in the spraint samples were calculated.The statistical analysis was conducted using chi-square and one-way ANOVA tests.The number of diet categories per spraint ranged from 1 to 4 with a mean of 1.42 ± 0.591. Fish was the dominant prey item in all sites with an overall frequency of occurrence of 84.77% and a relative percentage frequency of 59.68%. Labeobarbus spp. was the most frequent fish prey (35.45%). Crabs were the second most frequent prey items with percentage frequency of 33.41% and a relative percentage frequency of 23.52%, while small mammals and birds were the least frequent dietary items with percentage frequency of 0.45 and 0.23%, respectively. Other identified diet items and the respective percentage frequency were plant matter (6.17%), insects (5.68%), amphibians (5%), mollusks (2.5%) and unidentified items (3.86%). Variation on fish and crab prey items were observed between seasons and sites, while no variation was observed for other prey items. The results suggested a dietary flexibility and shift in the African clawless otter from crabs to fish that can be explained by availability and accessibility.

Key words: African clawless otter, Aonyx capensis, food items, Lake Tana.

Anteneh W, Dejen E, Getahun A (2012). Shesher and Welala floodplain wetlands (Lake Tana, Ethiopia): are they important breeding habitats for Clarias gariepinus and the migratory Labeobarbus fish species? Sci. World J. 2012:1-10.
Crossref

 

Arden-Clarke CHG (1986). Population density, home range and spatial organization of the Cape clawless otter, Aonyx capensis, in a marine habitat. J. Zool. Lond. 209:201-211.
Crossref

 

Baltrunaite L (2009). Diet of otters in fish farms in Lithuania. Acta Zoologica Lituanica 19:182-187.
Crossref

 

Butler JRA, du Toit JT (1994). Diet and conservation status of cape clawless otters in eastern Zimbabwe. S. Afr. J. Wildl. Res. 24:41-47.

 

Carugati C, Perrin MR (2003). Habitat, prey and area requirements of otters (Aonyx capensis) and (Lutra maculicollis) in the Natal Drakensberg, South Africa, Proceedings of the Eighth International Otter Colloquium, Trebon. pp. 18-23.

 

Dejen E, Vijverberg J, Nagekerke LAJ, Sibbing FA (2004). Temporal and spatial distribution of microcrustacean zooplankton in relation to turbidity and other environmental factors in large tropical lake (Lake Tana, Ethiopia). Hydrobiologia 513:39-49.
Crossref

 

Dejen E, Vijverberg J, Nagelkerke LAJ, Sibbing FA (2009). Growth, biomass, and production of two small barbs (Barbus humilis and B. tanapelagius, Cyprinidae) and their role in the food web of Lake Tana (Ethiopia). Hydrobiologia 636:89-100.
Crossref

 

de la Hey DC (2008). The importance of birds in the diet of otter Lutra lutra on Shapwick Heath. Biosci. Horizons 1:143–147.
Crossref

 

Emmerson W, Philip S (2004). Diets of Cape clawless otters at two South African coastal localities. Afr. Zool. 39: 201-210.
Crossref

 

Foster-Turley PA (1990). Introduction and Overall Recommendations. In: Otters; An Action Plan for their Conservation, pp. 1–3, (Foster-Turley PA, Macdonald S and Mason C eds), International Union Conservation Nature and Natural Resources, Gland.
Crossref

 

Getahun A, Dejen E (2012). Fishes of Lake Tana: A Guide Book. Addis Ababa University Press, Addis Ababa.

 

Heide FZ (2012). Feasibility Study for a Potential Biosphere Reserve Lake Tana. Michael Succow Foundation, Greifswald.

 

Hussain S A, Gupta SK, de Silva PK (2011). Biology and ecology of Asian small-clawed otter (Aonyx cinereus) (Illiger, 1815): a review. IUCN Otter Spec. Group Bull. 28:63-75.

 

Jacques H, Reed-Smith J, Somers MJ (2015). Aonyx capensis. The IUCN Red List of Threatened Species. <www.iucnredlist.org>. Downloaded on 1 December 2015.

 

Jordaan RK, McIntyre T, Somers MJ, Beste MN (2015). An assessment of spatial and temporal variation in the diet of Cape clawless otters (Aonyx capensis) in Marine environments. Afr. J. Wildl. Res. 45:342-353.
Crossref

 

Kanchanasaka B, Duplaix N (2011). Food habits of the Hairy-nosed otter (Lutra sumatrana) and the Small-clawed otter (Aonyx cinereus) in Pru Toa Daeng peat swamp forest, southern Thailand. IUCN Otter Spec. Group Bull. 28(A):139-149.

 

Kingdon J (1977). East African Mammals: An Atlas of Evolution in Africa. Volume IIIA:Carnivores. University of Chicago Press, Chicago.

 

Kingdon J (1997). The Kingdon Field Guide to African Mammals. Academic Press, London.

 

Krawczyk AJ, Bogdziewicz M, Majkowska K, Glazaczow A. (2016). Diet composition of the Eurasian otter Lutra lutra in different freshwater habitats of temperate Europe: a review and meta-analysis. Mammal Rev. 46:106-113.
Crossref

 

Kruuk H (2006). Otters: Ecology, Behaviour and Conservation. Oxford University Press, Oxford.
Crossref

 

Kruuk H, Goudswaard PC (1990). Effects of changes in fish populations in Lake Victoria on the food of otters (Lutra maculicollis Schinz and Aonyx capensis Lichtenstein). Afr. J. Ecol. 28:322-329.
Crossref

 

Lamb HF, Bates CR, Coombes PV, Marschall MH, Umer M, Davies SJ, Dejen E (2007). Late Pleistocene dessication of Lake Tana, source of the Blue Nile. Quarter. Res. 26:287-299.
Crossref

 

Lariviere S (2001). Aonyx capensis. Mammalian Species 671:1-6.
Crossref

 

Ligthart MF, Nel JA, Avenant NL (1994). Diet of Cape clawless otters in part of the Breede River system. S. Afr. J. Wildl. Res. 24:38-39.

 

Mason CF, Macdonald SM (1986). Otters: Ecology and Conservation. Cambridge University Press, Cambridge.

 

Melissa S (2006). Food Habits of a Re-Introduced River Otter (Lontra canadensis) Population in Western New York- Annual Diet, Temporal and Spatial Variation in Diet and Prey Selection Conclusions. MSc Thesis, Rochester Institute of Technology, Rochester.

 

Mirzaei R, Danehkar A, Abdoli A (2014). The diet of Eurasian otters in the Jajrood River System, Iran. Mammal Study 39:33-41.
Crossref

 

Nel JAJ, Somers MJ (2007). Distribution and habitat choice of Cape clawless otters in South Africa. S. Afr. J. Wildl. Res. 37: 61–70.
Crossref

 

Nowak RM (1991). Mammals of the World, 5th edn. Johns Hopkins University Press, Baltimore.

 

Ogada MO (2006). Effects of the Louisiana Crayfish (Procambarus Clarkii) Invasion on the Food and Territorial Ecology of the African Clawless Otter (Aonyx capensis) in the Ewaso Ng'iro Ecosystem, Kenya. PhD Dissertation, Kenyatta University, Nairobi.

 

Ottino P, Giller P (2004). Distribution, density, diet and habitat use of the otter in relation to land use in the Araglin valley, southern Ireland. Biology and Environment: Proceedings of the Royal Irish Academy 104:1-17.
Crossref

 

Perrin MR, Carugati C (2000). Food habits of coexisting Cape clawless otter and spotted- necked otter in the KwaZulu-Natal Drakensburg, South Africa. S. Afr. J. Wildl. Res. 30:85-92.

 

Poppe L, Frankl A, Poesen J, Admasu T, Dessie M, Adgo E, Deckers J, Nyssen J (2013). Geomorphology of the Lake Tana basin, Ethiopia. J. Maps 9:431-437.
Crossref

 

Reyes RK (2007). Ecology and Behaviour of the Southern River Otter (Lontra provocax) in Chile. PhD Dissertation, University of Osnabruck, Osnabruck.

 

Rowe-Rowe DT (1977). Food ecology of otters in Natal, South Africa. Oikos 28:210-219.
Crossref

 

Rowe-Rowe DT (1978). Biology of the two otter species in South Africa. In: (Duplaix, ed.), Otters, Proceedings of the first working meeting of the Otter Specialist Group, IUCN, Gland.

 

Rowe-Rowe DT, Somers MJ (1998). Diet, foraging behaviour and coexistence of African otters and the water mongoose. Symposium Zoological Society of London 71:216-227.
Crossref

 

Sales-Luis T, Pedroso NM, Santos-Reis M (2007). Prey availability and diet of the Eurasian otter (Lutra lutra) on a large reservoir and associated tributaries. Can. J. Zool. 85:1125-1135.
Crossref

 

Somers MJ, Purves MG (1996). Trophic overlap between three syntopic semi-aquatic carnivores: Cape clawless otter, Spotted-necked otter and water mongoose. Afr. J. Ecol. 34:158-166.
Crossref

 

Somers MJ (2000). Seasonal variation in the diet of Cape clawless otters (Aonyx capensis) in a marine habitat. Afr. Zool. 35:261-268.
Crossref

 

Somers MJ, Nel JAJ (2003). Diet in relation to prey of Cape clawless otters in two rivers in the western Cape Province, South Africa. Afr. Zool. 38: 317-326.

 

Van der Zee D (1981). Prey of the Cape clawless otter (Aonyx capensis) in the Tsitsikama Coastal National Park, South Africa. J. Zool., Lond. 194:467-483.
Crossref

 

Verwoerd D (1987). Observations on the food and status of the Cape clawless otter Aonyx capensis at Betty's Bay, South Africa. S. Afr. J. Wildl. Res. 22:33-39.

 

Watson LH, Lang AJ (2003). Diet of Cape clawless otters in Groenvlei Lake, South Africa. S. Afr. J. Wildl. Res. 33:135-137.

 

Yalden DW, Largen MJ, Kock D, Hillman JC (1996). Catalogue of the mammals of Ethiopia and Eritrea. 7. Revised checklist, zoogeography and conservation. Trop.Zool. 9:73-164.
Crossref

 


APA Andarge, E., Wube, T., & Balakrishnan, M. (2017). “Diet analysis of the African clawless otter (Aonyx capensis) in and around Lake Tana”. Journal of Ecology and The Natural Environment, 9(4), 53-61.
Chicago Engedasew Andarge, Tilaye Wube and Mundanthra Balakrishnan. "“Diet analysis of the African clawless otter (Aonyx capensis) in and around Lake Tana”." Journal of Ecology and The Natural Environment 9, no. 4 (2017): 53-61.
MLA Engedasew , et al. "“Diet analysis of the African clawless otter (Aonyx capensis) in and around Lake Tana”." Journal of Ecology and The Natural Environment 9.4 (2017): 53-61.
   
DOI 10.5897/JENE2016.0608
URL http://academicjournals.org/journal/JENE/article-abstract/6B3ABFC63783

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