Invertebrates Diversity in Arabuko-Sokoke Forest and Nearby Farmland at Gede, Kilifi County, Kenya

Authors

  • Simon Musila Mammalogy Section, National Museums of Kenya, P.O. Box 40658-00100, GPO Nairobi, Kenya
  • Ivan Castro Arellano Department of Biology, Texas State University-San Marcos, 601 University Drive, San Marcos, TX 7866-4684
  • Robert Syingi Mammalogy Section, National Museums of Kenya, P.O. Box 40658-00100, GPO Nairobi, Kenya
  • Nathan Gichuki School of Biological Sciences, University of Nairobi, Chiromo-Nairobi, Kenya

DOI:

https://doi.org/10.30564/jzr.v4i2.4666

Abstract

Insectivorous bats mainly feed on various types of invertebrates. The authors studied the abundance and diversity of invertebrates in the farmland in the eastern part of Arabuko-Sokoke Forest, mainly to assess their availability to insectivorous bats occurring in the two study sites. Solar powered light traps were used to attract aerial invertebrates to a white suspended cloth sheet used as a landing surface. The sampling was conducted for four hours in one trapping station each night, and in twelve different stations both in the ASF and farmland. A total of 6,557 invertebrates individuals were trapped, which included 48% in ASF and 52% in the farmland. The two most common invertebrate orders were Hymenoptera (ants, bees, wasps and sawflies) represented by 38.1%, and Coleoptera (beetles, 28.1%). The interior of ASF had higher invertebrate species diversity (Shannon-Weiner index 1.72 ± 0.1), than the farmland (1.41 ± 0.1). Although the farmland (260.5 ± 52.9, N=12) had higher mean number of invertebrates trapped per night, than the interior of ASF (200.3 ± 36.4, N=12), there was no significant difference between the medians of invertebrates captured in the two study areas (Mann-Whitney U-Test, U=61: P>0.544). Thus, the farmland and the interior of ASF had the same invertebrate abundance. This study indicates the value of human-modified areas (agricultural and human settlements) landscapes, always ignored in biodiversity surveys, in sustaining diverse invertebrates that are preyed by different species of insectivorous bats that occur in the two study areas.

Keywords:

Light traps, Sampling, Hymenoptera, Coleoptera, Abundance, Insectivorous bats, Prey

References

[1] MacKenzie, D.I., Nichols, J.D., Royle, J.A., et al., 2006. Occupancy estimation and modelling: inferring patterns and dynamics of species occurrence. Academic Press. Burlington, MA.

[2] Loeb, S.C., O’Keefe, J.M., 2006. Habitat use by forest bats in South Carolina in relation to local, stand, and landscape characteristics. Journal of Wildlife Management. 70, 1210-1218.

[3] Morrison, M.L., 2001. A proposed research emphasis to overcome the limits of wildlife-habitat relationship studies. Journal of Wildlife Management. 65, 613- 623.

[4] Ford, W.M., Menzel, J.M.A., Rodrigue, L., et al., 2005. Relating bat species presence to simple habitat measures in a central Appalachian Forest. Biological Conservation. 126, 528-539.

[5] Lacki, M.J., Hayes, J.P., Kurta, A., 2007. Bats in for-ests: Conservation and management. John Hopkins University. Baltimore, MD.

[6] Scanlon, A.T., Petit, S., 2008. Effects of site, time, weather and light on urban bat activity and richness: Considerations for survey effort. Wildlife Research. 35. 821-834.

[7] Bender, M.J., Castleberry, S.B., Miller, D.A., et al., 2015. Site occupancy of foraging bats on landscapes of managed pine forest. Forest Ecology and Management. 336, 1-10.

[8] Adams, M.D., Law, B.S., French, K.O., 2009. Vegetation structure influences the vertical stratification of open- and edge-space aerial-foraging bats in harvested forests. Forest Ecology and Management. 258, 2090-2100.

[9] Musila, S., Syingi, R., Gichuki, N., et al., 2018. Bat activity in the interior of Arabuko-Sokoke Forest and adjacent farmland in Kenya. Journal of Bat Research and Conservation. DOI: https://doi.org/10.14709/BarbJ.11.1.2018.05

[10] Musila, S., Gichuki, N., Castro-Arellano, I., et al., 2019. Composition and diversity of bat assemblages at Arabuko-Sokoke Forest and the adjacent farmland, Kenya. Mammalia. 84(2), 121-135.

[11] Musila, S., Bogdanowicz, W., Syingi, R., et al., 2019. No lunar phobia in insectivorous bats in Kenya. Mammalian Biology. 95. DOI: https://doi.org/10.1016/j.mambio.2019.03.002

[12] Bennun, L.A., Njoroge, P., 1999. Important bird areas in Kenya. Nature Kenya, Nairobi-Kenya.

[13] Muchiri, M.N., Kiriinya, C.K., Mbithi, D.M., 2001. Forestry Inventory Report for the Indigenous Forest in Arabuko-Sokoke Forest Reserve. Kenya Forestry Research Institute. Nairobi, Kenya.

[14] Arabuko-Sokoke Forest Management Team (ASFMP), 2002. Arabuko-Sokoke forest strategic forest management plan 2002-2007. Arabuko-Sokoke Forest Management Team: Forest Department and Partners, Nairobi.

[15] Kelsey, M.G., Langdon, T.E.S., 1984. The conservation of Arabuko-Sokoke Forest. International Council for Bird Preservation (ICBP Study Report No. 4). Cambridge-UK.

[16] Oyugi, J.O., Brown, J.S., Whelan, C.J., 2007. Effects of human disturbance on composition and structure of Brachystegia woodland in Arabuko-Sokoke Forest, Kenya. African Journal of Ecology. 46, 374-383.

[17] Collar, N.J., Stuart, S.N., 1988. Key Forests for Threatened Birds in Africa. ICBP Monographs No. 3. Cambridge: ICBP. pp. 109.

[18] Musila, S., Webala, P.W., Syingi, R., et al., 2019. Bat roosting crisis in Kenya. African Conservation Telegraph. 15(1).

[19] Nag, A., Nath, P., 1991. Effect of moon light and lunar periodicity on the light trap catches of cutworm Agrotis ipsilon (Hufn.) moths. Journal of Applied Entomology. 111, 358-360.

[20] Holyoak, M., Jarosik, V., Novak, I., 1997. Weather-induced changes in moth activity bias measurement of long-term population dynamics from light trap samples. Entomologia Experimentalis et Applicata. 83, 329-335.

[21] Sanyal, A.K., Uniyal, V.P., Chandra, K., et al., 2013. Diversity, distribution pattern and seasonal variation in moth assemblages along altitudinal gradient in Gangotri landscape area, Western Himalaya, Uttarakhand, India. Journal of Threatened Taxa. 5(2), 3646- 3653.

[22] Fry, R., Waring, P., 2001. A guide to moth traps and their use. The Amateur Entomologists’ Society. 24, 1-68.

[23] Wolbert, S.J., Zellner, A.S., Whidde, H.P., 2014. Bat activity, insect biomass, and temperature along an elevational gradient. Northeastern Naturalist. 21, 72- 85.

[24] Anthony, E.L.P., Kunz, T.H., 1997. Feeding strategies of the little brown bat, Myotis lucifugus, in southern New Hampshire. Ecology. 58, 775-786.

[25] Barclay, R.M.R., 1985. Foraging strategies of tropical bat Scotophilus leucogaster. Biotropica. 17, 65-70.

[26] Aguiar, A.P., Santos, B.F., 2010. Discovery of potent, unsuspected sampling disparities for Malaise and Mo¨ricke traps, as shown for Neotropical Cryptini (Hymenoptera, Ichneumonidae). Journal of Insect Conservation. 4, 199-206.

[27] Russo, L., Stehouwer, R., Heberling, J.M., et al., 2011. The Composite Insect Trap: An Innovative Combination Trap for Biologically Diverse Sampling. PLoS ONE. 6(6), e21079.

[28] Shannon, C.E., Weaver, W., 1963. The mathematical theory of communication. University of University of Illinois Press. Urbana-USA.

[29] Coleman, J.L., Barclay, R.M.R., 2013. Prey availability and foraging activity of grassland bats in relation to urbanization. Journal of Mammalogy. 94(5), 1111- 1122.

[30] Hammer, Ø., Harper, D.A.T., Ryan, P.D., 2001. PAST: Paleontological Statistics Software package for education and data. http://palaeo-electronica. org/2001_1/past/issue1_01.htm (Accessed 27th January 2022).

[31] Wickramasinghe, L.P., Harris, S., Jones, G., et al., 2004. Abundance and species richness of nocturnal invertebrates on organic and conventional farms:effects of agricultural intensification on bat foraging. Conservation Biology. 18, 1283-1292.

[32] Merckx, T., Van Dongen, S., Matthysen, E., et al., 2008. Thermal flight budget of a woodland butterfly in woodland versus agricultural landscapes: an experimental assessment. Basic and Applied Ecology. 9, 433-442.

[33] Khadijah, A.R., Azidah, A.A., Meor, S.R., 2013. Diversity and abundance of insect species at Kota Damansara Community Forest Reserve, Selangor. Scientific Research and Essays. 8, 359-374.

[34] Mason, W.R.M., Huber, J.T., 1993. Chapter 2 Order Hymenoptera in: Hymenoptera of the world: An identification guide to families (H. Goulet and JT Huber, eds). Centre for Land and Biological Resources Research Ottawa, Ontario. pp. 14-56.

[35] Pavey, C.R., Burwell, C.J., Grunwald, J.E., et al., 2001. Dietary benefits of twilight foraging by insectivorous bats. Biotropica. 33, 670-681.

[36] Beck, J., Brehm, G., Fiedler, K., 2011, Links between the Environment, Abundance and Diversity of Andean Moths. Biotropica. 43, 208-217.

[37] Hosaka, T., Niino, M., Kon, M., et al., 2014. Impacts of smallscale clearings due to selective logging on dung beetle communities. Biotropica. 46, 720-731.

[38] Wirooks, L., 2005. Die ökologische Aussagekraft des Lichtfangs: Eine Studie zur Habitatanbindung und kleinräumigen Verteilung von Nachtfaltern und ihren Raupen. Wolf and Kreuels, Havixbeck-Hohenholte. pp. 302.

[39] Kalcounis, M.C., Brigham, R.M., 1995. Intraspecific variation in wing-loading affects habitat use by little brown bats (Myotis lucifogus). Canadian journal of Zoology. 73, 89-95.

[40] Chung, A.Y.C., Eggleton, P., Speight, M.R., et al., 2004. The diversity of beetle assemblages in different habitat types in Sabah, Malaysia. Bulletin of Entomological Research. 90, 475-496.

[41] Bowden, J., 1982. An analysis of factors affecting catches of insects in light traps. Bulletin of Entomological Research. 72, 535-556.

[42] Webala, P.W., Craig, M.D., Law, B.S., et al., 2011. Bat habitat use in logged jarrah eucalypt forests of south-western Australia. Journal of Applied Ecology. 48, 398-406.

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Vol. 4 , Iss. 2 (April 2022)

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