Chabi A.M.S. Djagoun 1, Brice Sinsin, Nicole Wrage-Mönnig 1. Contact
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1 Niche overlap and resource partitioning between rare topi antelope (Damaliscus korrigum) and other sympatric bulk grazers in Pendjari Biosphere Reserve (Northern Benin): Implication for topi conservation Chabi A.M.S. Djagoun 1, Brice Sinsin, Nicole Wrage-Mönnig 1 Contact dchabi@gmail.com
2 Mammalian herbivores Diversity and global distribution Orders Families Genera Species Africa Eurasia Americas African refuge? Codron D (2013) In: Grzimek B, MacLeod N, Archibald JD, Levin PS, Blanchfield DS (eds) Grzimek's animal life encyclopedia: Extinction. Gale/Cengage Learning, Detroit, pp To prevent from biodiversity extinction PA have been created worldwide including Africa
3 High-Human population density-low Low-large mammal density-high Worldwide: large mammal populations are restricted to protected areas of minimal human disturbance Cause: Human population growth and land transformations also negatively influence ungulate population dynamics through the degradation and destruction of animal natural habitats with high exploitation (Ogutu et al., 2009) NETWORK OF BENIN PROTECTED AREA
4 Reduncinae Alcelaphinae Damaliscus lunatus Population: 209 ind Diet: Gr Alcelaphus buselaphus Population: 1117 ind Diet: Gr Redunca redunca Population: 957 Diet: Gr Kobus defassa Population: 1235 ind Diet: MF Kobus kob Population: ind Diet: Gr GRAZER herbivores diversity Population Density in Pendjari Biosphere Reserve Hippotraginae Bovinae Syncerus cafer Population: ind Diet: Gr Tragelaphus scriptus Population: 42Kg Diet: Br Hippotragus equinus Population: 2975 ind Diet: Gr
5 One of the major problems associated with management of animal community confined in protected area is the accommodation of the number of different species in equilibrium with one another and their natural environment.
6 Topi population has registered persistent declines (Kidjo et al. 1991, RBP, 2012, Bouché et al. 2015) 1991: 2240 individuals 2011: 650 individuals 2015: 209 individuals
7 Predictions Competition for available habitat and natural resources, such as water and food, could lead to gradual decline of less dominant species (Macandza 2009). Accordingly, low density species should avoid sharing space with trophically similar much more abundant and competitively superior species, particularly during seasons of limited food availability As selective grazers and in very low density in PBR, topi antelope is predicted to be sensitive to habitat change and competition from sympatric grazers, and are susceptible to nutritional deficiencies (Codron et al. 2009).
8 Data collection: Dependent variable: Number of individual per species along 38 transects of 7 km each. Independent variables: habitat types, wood density, fire, grass and canopy cover, the nearest distance to roads, distance to the closest river, distance to the closest pond and tree density. Collagen samples from herbivore tooth were analyzed for 13C/12C and 15N/14N ratios by stable light isotope ratio mass spectrometry (Codron et al., 2007).
9 Data analysis Poisson regression: Crucial variables in habitat selection. Discriminant Function Analysis (DFA): to determine whether the areas used by western kob, waterbuck and the unused but available discriminated on the basis of the most crucial variables identified. The extent of diet separation along the C and/or N isotope niche axis: SIBER (Stable Isotope Baesyian Ecology in R) and nicherover (Niche Region and Niche Overlap Metrics for Multidimensional Ecological Niches) R Core Team, 2013
10 Wet Season Dry Season Output of linear discriminant function analysis to examine whether the areas used by Topi, Hartebeest and Roan at seasonality scale could be discriminated on the basis of habitat features in the areas. Locations used by the Hartebeest differ from those used by Topi in Dry season could be well discriminated by canopy and grass cover. In wet season Distance watering point and tree density could explain that discrimination but with no clear parttern
11 Ten random elliptical projections of trophic niche region (NR) for each species and pair of isotopes (elliptical plots) Higher segregation is noticed on the Nitrogen stable isotope partitioning between the Roan and the two other species (Topi and Hartebeest) The isotopic niche area of high density species such as Roan is higher than the one for the hartebeest and the Topi which has the lowest population density. This suggest that rare antelope could narrow their dietary niche to limit competition in the coexisting system Partial segregation could be noticed on the Carbone stable isotope axis for the three species Higher niche overlap occurs between tree species on the Carbone stable isotope axis, but on the Nitrogen stable isotope axis only topi and hartebeest show the same pattern.
12 Posterior distribution of the probabilistic niche overlap (Oij) metric (%) for a specified Niche Region of 95% for topi, hartebeest and Roan Oij=78% Oij=48% Oij=92 % Oij=62 % Oij=12 % Oij=8 %
13 Isotopic niche sizes of Hartebeest, Roan and Topi Large isotopic niche breath at individual level in Roan antelope. Large isotopic niche breath at individual level in Roan antelope. This result revealed that within species variation of stable isotope ratios explained the isotopic niche breadth of the study species better than betweenspecies variation.
14 δ 13 C V P D B ( ) δ 13 C V P D B ( ) δ 13 C V P D B ( ) D. Korrigum mm from DE junction Topi1 Topi2 Topi3 Topi4 Topi5 Topi6 Topi7-5 A. buselaphus Hartebeest1 Hartebeest2 Hartebeest3 Hartebeest4 Hartebeest5 Hartebeest mm from DE junction -5 H.equinus mm from DE junction Roan1 Roan2 Roan3 Roan4 Roan5 Roan6 Roan7
15 δ 15 N Air ( ) δ 15 N Air ( ) δ 15 N Air ( ) 6 D. Korrigum mm from 15 DE junction Topi1 Topi2 Topi3 Topi4 Topi5 Topi6 Topi A. buselaphus mm from DE junction Hartebeest1 Hartebeest2 Hartebeest3 Hartebeest4 Hartebeest5 Hartebeest H.equinus mm from DE junction Roan1 Roan2 Roan3 Roan4 Roan5 Roan6 Roan7
16 The sections of the landscape supporting the low density topi were distinct from areas frequently used by high density grazers (Roan and Hartebeest) in dry season. stable isotope ratios of teeth increments indicated that isotopic dietary niches were distinct and, overall, separated from each other in individuals of Roan (the high density species), Hartebeest and Topi co-existing in Pendjari. This could contribute to explaining why topi occur in low density as well as the decline and the lack of recovery by the population.
17 THANKS FOR YOUR ATTENTION
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