Distribution and Forage Potential of Some Insect Taxa Sampled with Sweep Nets in the Flood Plains of a Coastal Ramsar Site in Ghana

Francis Gbogbo, Daniel Osei Yeboah, Maxwell K. Billah

Department of Animal Biology and Conservation Science, University of Ghana, Legon.

DOI: 10.4236/oje.2014.43015                

Abstract

Wetland insect communities are an important food source for waterbirds. Yet studies on insect communities in West African coastal wetlands—a major foraging area for wintering waterbirds of the East Atlantic and Mediterranean flyways—are generally limited. This study investigated the forage potential, micro-spatial and temporal distribution of insects swept from air and low vegetation in Sakumo II—a coastal Ramsar site in Ghana. Insects of the families Thripidae, Coccinellidae, Tetrigidae and Acrididae dominated the wetland. Based on prey yield and abundance, Acrididae, Coccinellidae and Tetrigidae appeared to be most promising source of food for waterbirds. Despite the high abundance of Thripidae, their low per capita biomass rendered them a less promising food source particularly to large sized waterbird species. Spatial and temporal abundance and distributions of insects along both the latitudinal and longitudinal axes of the lagoon were non-significant. In recognition of the diversity and abundance of insects on the wetland, there is the need to investigate the disparity in the utilisation of the various taxa by waterbird species.

Keywords

Insecta; Waterbirds; Distribution; Forage; Biomass

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Novotny, V., Drozd, P., Miller, S.E., Kulfan, M., Janda, M., Basset, Y. and Weiblen, G.D. (2006) Why Are There So Many Species of Herbivorous Insects in Tropical Rainforests? Science, 313, 1115-1118. http://dx.doi.org/10.1126/science.1129237
[2]	Liordos, V. (2010) Foraging Guilds of Waterbirds Wintering in a Mediterranean Coastal Wetland. Zoological Studies, 49, 311-323.
[3]	Mauco, L., Marco, F. and Bo, S.A. (2001) Food and Feeding Biology of the Common Tern during the Non-Breeding Season in Samborombon Bay, Beunos Aires, Argentina. Waterbird, 24, 89-96.
[4]	Gordon, I and Cobblah, M. (2000) Insects of the Muni-Pomadze Ramsar Site. Biodiversity & Conservation, 9, 479-486. http://dx.doi.org/10.1023/A:1008910629152
[5]	Gbogbo, F., Langpuur, R. and Billah, M.K. (2012) Forage Potential, Micro-Spatial and Temporal Distribution of Ground Arthropods in the Flood Plain of a coastal ramsar Site in Ghana. African Journal of Science and Technology, 12, 80-88.
[6]	Batzer, D.P. (1996) Ecology of Insect Communities in Non-Tidal Wetlands. Annual Review of Entomology, 41, 75-100. http://dx.doi.org/10.1146/annurev.en.41.010196.000451
[7]	Batzer, D.P, McGee, M., Resh, V.H. and Smith, R.R. (1993) Characteristics of Invertebrates Consumed by Mallards and Prey Response to Wetland Flooding Schedules. Wetlands, 13, 4149. http://dx.doi.org/10.1007/BF03160864
[8]	Suapim, R.H., Attuquayefio, D.K., Gbogbo, F. and Owusu, E.H. (2007) Aspects of the Feeding Ecology of Wintering Waterbirds on the Densu Delta Ramsar Site, Ghana. Ghana Journal of Science, 42, 17-34.
[9]	Ntiamoa-Baidu, Y., Piersma, T., Wiersma, P., Poot M., Battley, P. and Gordon, C. (1998) Habitat Selection, Daily Foraging Routines and Diet of Waterbirds in Coastal Lagoons in Ghana. Ibis, 140, 89-103. http://dx.doi.org/10.1111/j.1474-919X.1998.tb04545.x
[10]	Piersma, T. and Ntiamoa-Baidu, Y. (1995) Waterbird Ecology and the Management of Coastal Wetlands in Ghana, NIOZ Report 1996-6, Netherlands, 105.
[11]	Wetland International (1998) Coastal Wetland Management Project, Wildlife Department. www.wetlands.org/reports/ris/1GH004en.pdf
[12]	Pauly, D. (1975) On the Ecology of a Small West African Lagoon. Berichte der Deutschen Wissenschaftlichen Kommission fur Meeresforschung, 24, 46-62.
[13]	Oteng-Yeboah, A.A. (1999) Biodiversity Studies in Three Coastal Wetlands in Ghana West Africa. Journal of the Ghana Science Association, 3, 147-149.
[14]	BirdLife International (2012) Important Bird Areas Factsheet: Sakumo Lagoon Ramsar Site. http://www.birdlife.org
[15]	Ashcroft, S. and Pereira, C. (2003) Practical Statistics for the Biological Science: Simple Pathway to Statistical Analyses. Palgrave Macmillan, New York, 167.
[16]	Magurran, A.E. (1988) Ecological Diversity and Its Measurements. Princeton University Press, New Jersey, 179. http://dx.doi.org/10.1007/978-94-015-7358-0
[17]	Charnov, E.L. (1976) Optimal Foraging, the Marginal Value Theorem. Theoretical Population Biology, 9, 129-136. http://dx.doi.org/10.1016/0040-5809(76)90040-X
[18]	Yahnke, C.J. (2006) Optimal Foraging Theory: Using Bird Predation on Goldenrod Galls. The American Biology Teacher, 68, 471-475. http://dx.doi.org/10.1662/0002-7685(2006)68[471:TOFTUB]2.0.CO;2
[19]	Van de Kam, J., Ens, B., Piersma, T. and Zwarts, L. (2004) Shorebirds—An Illustrated Behavioural Ecology. KNNV, Netherlands, 368.
[20]	Bloksma, J. Ens, B.J. and de Vries, M. (1979). Voedseloecologie van de Wulp op het Fries Wad. Student Report, Zoological Laboratory, University of Groningen, Groningen.
[21]	Scharf, F.S., Juanes, F. and Rountree, R.A. (2000) Predator Size—Prey Size Relationships of Marinefish Predators: Interspecific Variation and Effects of Ontogeny and Body Size on Trophic-Niche Breadth. Marine Ecology Progress Series, 208, 229-248. http://dx.doi.org/10.3354/meps208229
[22]	Gbogbo, F. (2007) The Importance of Unmanaged Wetlands to Waterbirds in Coastal Ghana. African Journal of Ecology, 45, 599-606. http://dx.doi.org/10.1111/j.1365-2028.2007.00778.x
[23]	Montague, C.L. and Ley, J.A. (1993) A Possible Effect of Salinity Fluctuation on Abundance of Benthic Vegetation and Associated Fauna in Northeastern Florida Bay. Estuaries, 16, 703-717. http://dx.doi.org/10.2307/1352429
[24]	Gordon, C. (2000) Hypersaline Lagoons as Conservation Habitats: Macro-Invertebrates at Muni Lagoon, Ghana. Biodiversity and Conservation, 9, 465-478. http://dx.doi.org/10.1023/A:1008906503227
[25]	Ntiamoa-Baidu, Y. (1991) Seasonal Changes in the Importance of Coastal Wetlands in Ghana for Wading Birds. Biological Conservation, 57,139-158. http://dx.doi.org/10.1016/0006-3207(91)90135-V
[26]	Landys-Ciannelli, M.M., Piersma, T. and Jukema, J. (2003) Strategic Size Changes of Internal Organs and Muscle Tissues in the Bar-Tailed Godwit during Fat Storage on a Spring Stopover Site. Functional Ecology, 17, 151-159. http://dx.doi.org/10.1046/j.1365-2435.2003.00715.x
[27]	Battley, P.F., Piersma, T., Dietz, M.W., Tang, S., Dekinga, A. and Hulsman, K. (2000) Empirical Evidence for Differential Organ Reductions during Trans-Oceanic Bird-Flight. Biological Sciences, 267, 191-195. http://dx.doi.org/10.1098/rspb.2000.0986
[28]	Piersma, T. and Jukema, J. (2002) Contrast in Adaptive Mass Gains: Eurasian Golden Plovers Store Fat before Midwinter and Protein before Pre-Breeding Flight. Proceedings of the Royal Society of London, 269, 1101-1105. http://dx.doi.org/10.1098/rspb.2002.1990