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Department of Biology, Federal University of Technology Akure, Ondo State, Nigeria 2Department of Zoology, Obafemi Awolowo University, Ile-Ife

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Department of Biology, Federal University of Technology Akure, Ondo State, Nigeria 2Department of Zoology, Obafemi Awolowo University, Ile-Ife Ethiopian Journal of Environmental Studies & Management 9(3): 255 – 266, 2016. ISSN:1998-0507 doi: http://dx.doi.org/10.4314/ejesm.v9i3.1 Submitted: July 28, 2015 Accepted: April 15, 2016 RAPID SURVEY OF DRAGONFLIES (INSECTA: ODONATA) OF KRIBI FOREST AND CAMPO MA’AM NATIONAL PARK, SOUTHERN CAMEROON *ADU, B.W.,1 OGBOGU S.S.2 AND AKINDELE, E.O.2 1Department of Biology, Federal University of Technology Akure, Ondo State, Nigeria 2Department of Zoology, Obafemi Awolowo University, Ile-Ife Abstract A five day survey was carried out to assess the odonate fauna associated with the riverine sections of two forests (Kribi Forest and Campo Ma’am National Park) of southern Cameroon. The primary objective of the study was to determine the species composition and community structure of the odonate fauna occurring in the forests. The goal is to infer the health status of the two forests. Three study sites were selected, one in each of the main water bodies in the forests (Rivers Kienke and Linde in Kribi forest, and River Bitande in Campo Ma’am National Park). All the specimens collected were identified to the lowest taxonomic level. A total of one hundred and ninety four (194) individuals of Odonata were collected in the forests comprising 10 families, 24 species of Anisoptera and 30 species of Zygoptera. Anthropogenic activities were less prevalent at Campo Ma’am National Park, an area in which all the 10 families were incidentally recorded. The community structure of the southern forest revealed that only River Bitande with Shannon-Wiener diversity index (H`) of 3.80 was having a stable environmental condition. Others were close to stable condition (River Kienke H` 2.99 and River Linde H` 2.95) with mild disturbance caused by human activity. Simpson index range (0.94 – 0.98) at the three study sites revealed that the vegetation was matured and stable. The distribution of dragonflies and damselflies revealed a stable environment (Evenness 0.90 – 0.95). Kribi Forest appears to be more impacted by anthropogenic activities as fewer (six) families were recorded there. The relative distribution of the species in the two forest ecosystems seemed to have some relationship with human interference therein. Key Words : Damselfly, Dragonfly, Diversity, Forest, River Introduction felling of trees, point source discharge, Tropical countries especially in sub- damming and channelization of streams Saharan Africa are facing problem of and rivers have resulted in the opening up deforestation occasioned by increased of forests and degradation of the water human activities and poor management bodies (Smith et al ., 2009). of forest resources (Smith et al ., 2009). Channelization of rivers and streams This has resulted in loss of some flora affects the velocity of water leading to and fauna that are endemic to tropical deposition of silt and consequently forest ecosystems. Practices such as change in their substrate composition 255 *Corresponding Author: Adu, B.W. Email: [email protected] Rapid Survey of Dragonflies (Insecta : Odonata) of Kribi Forest ................ ADU et al. (Adu, et al ., 2014). This change is protected forests respectively). It was hazardous to the wellbeing of odonate hypothesized that the two forests would fauna both in water and within riparian have diverse forms of anthropogenic forest vegetation. These unhealthy activities which could influence their conditions usually result in habitat shift local flora and fauna. It was further or death of dragonflies and damselflies, hypothesized that, since the two forests especially those with narrow niche (Adu were experiencing different levels of and Ogunjobi, 2014). Odonate fauna with human disturbance, they would differ in broad niche and mostly the ubiquitous terms of Odonata species composition can cope considerably in disturbed and community structure. This study was habitat (Clausnitzer, 2006). They are also thus aimed at describing the health status good colonizers of temporary of the two forest ecosystems based on the environment and some are known to be species composition and community good indicators of polluted freshwater structure of dragonflies and damselflies and terrestrial environments (Corbet, in the forests. 1999). Studying Odonata of southern Vegetation architecture plays Cameroon dates back to 1884 (Vick important role in regulating the 2003) when the Germans took over the distribution and assemblage of Odonata coastal part of Duala territory species (Korkeamaki and Suhonen, (Mbuagbaw et al ., 1987). Series of 2002). Therefore, a depleted forest will research works on Odonata have been be too open for shade-lovers, who might carried out in the country ever since. have been killed or migrated out of the Contributions of odonatologists like environment. River ecosystems Karsch (1890) laid the foundation of the especially the adjacent riparian study of dragonflies in Cameroon. Pinhey vegetation usually have a high (1962, 1964, and 1974) gave detailed assemblage of Odonate fauna. Streams, records of Odonata from Fernando Po, freshwater swamps and peat swamps are Malende, Koto Barombi and Nyasoso. known to be rich in dragonflies and Recent works on dragonflies of southern damselflies (Che Salmah et al. , 2005). Cameroon include that of Vick (2003), Although Odonata occurs in almost every which provided a checklist of the form of freshwater ecosystem, Odonata of the southwestern Province of microhabitats with high heterogeneity of Cameroon and biodiversity assessment of vegetation are believed to be the primary the Odonate fauna of the Takamanda factor determining their composition, Forest Reserve. Other scholarly works diversity and distribution (Watanabe et include Chelmick (1999, 2001) who al. , 2004). worked on the larvae of a member of Dragonflies and damselflies are Aeshnidae. The contributions of these sensitive to anthropogenic activity (Clark scholars have revealed that southern and Samways, 1996; Stewart and Cameroon forests are very rich in Samways, 1998). The two areas selected Odonata. This particular study was a for this study (Kribi Forest and Campo quick and brief assessment of two forests Ma’am National Park) have in southern Cameroon, viz Kribi Forest heterogeneous vegetation, although they and Campo Ma’am National Park. are of different status (unprotected and According to Dijkstra (2007), a rapid 256 Ethiopian Journal of Environmental Studies and Management Vol. 9 no.3 2016 survey of a forest is able to give a fair Materials and Methods picture of the local diversity of Odonata Study Site within a short period of time. Although Two forests in Southern Cameroon previous scholars agreed that the forests were surveyed with the intention of are hotspots of Odonate fauna, data on identifying odonate species inhabiting the the local faunal composition of Odonata forests. These two forests, like most in the forests are lacking. forests in sub-Saharan Africa, are This paper is a product of the subjected to degradation owing to fieldwork carried out during a brief visit anthropogenic activities. Human to the forests. Although it was a rapid activities in the two forests include assessment of Odonate fauna in the farming; logging and construction work forests, it was meant to supplement especially in Kribi forest. These activities already known information on Odonata were however minimal at the Campo of Cameroon in general and of the forests Ma’am National Park due to strict in particular. Besides, the effect of compliance with government forest climate change and human activities conservation and management policies. prevailing in sub-Saharan forests, which Nevertheless, limited logging was could have altered composition, allowed in some part of the park. distribution and species diversity of Subsistence farming was observed at the odonate fauna in the forest, necessitated camps adjacent to the forest. Three study the need for an assessment of the current sites were established in the two forests: status forests. two in Kribi forest and one site at Campo-Ma’am National Park. Table 1 presents the Geo- reference coordinate of the three study sites while Figure 1 presents the map of south Cameroon forest. Table 1: Geo-reference coordinates of the three study sites at Kienke, Linde, and Bitande Rivers. Study Site Location Geo-Reference Coordinate River Kienke Kribi Forest 02° 28`12 - 02° 28` 56 N, 09° 51`28 -09° 51` 47 ʹE River Linde Kribi Forest 02°25 ʹ33 - 02° 26 ʹ08 N, 09° 51 ʹ48-09° 52 ʹ06 ʹE River Bitande Campo Ma'am 02° 21 ʹ42- 02° 21 ʹ58 N, 09° 55 ʹ58-09° 56 ʹ10 ʹE National Park 257 Rapid Survey of Dragonflies (Insecta: Odonata) of Kribi Forest ................ ADU et al. Figure 1: Map of Southern Cameroon Forest Reserve. The Stars ( ) on the map indicate the three study sites Collection, Preservation and acetone for a minimum of 12 hours, after Identification of Specimens which they were dried on tissue paper in Samples of adult dragonflies and open air and then kept in cellophane damselflies were caught using a sweep envelopes. All specimens collected were net. The sampling was carried out in the deposited in the National Museum of two forests between 9.00 am and 4.00 Natural History Naturalis, Leiden, pm. The survey lasted for 5 days (10 th - Netherlands. Identification of all the 14 th June, 2008). Kribi Forest was samples collected was carried out by an surveyed from 10 th to 12 th of June and odonatological expert in Cameroon. Campo-Ma’am forest surveyed on 13 th Data Analysis and 14 th of June. All the specimens Species richness of the three study collected were kept in small triangular sites was determined using diversity envelopes. Males and females caught in indices which include Shannon-Wiener tandem were placed together inside one index (H`) Margalef index d Simpson’s envelope and then labeled. Adult Dominion index (C) and Evenness E. specimens were preserved by placing Simple descriptive statistic like each catch in a triangular envelope and percentage was also used in the analysis then immersing them in acetone.
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