Higher richness proportion of species with low

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Unformatted text preview: roportion of species with low abundance Lower richness PH PL Population abundance M3.10 BIO 3115 Université d’Ottawa / University of Ottawa M3 2009-2010.5 BIO 3115 Conservation Biology Rarity, population abundance and species richness: Caribbean birds On Caribbean islands, as richness of bird community increases, average relative abundance decreases Location Panama Number of Relative richness species per abundance habitat per species per habitat 135 30.2 2.95 Trinidad 108 28.2 3.31 Jamaica 156 21.4 4.97 St. Lucia 33 15.2 5.77 St. Kitts 20 11.9 5.88 M3.11 BIO 3115 Université d’Ottawa / University of Ottawa Rarity, population abundance and species richness: Trees on Barro Colorado Island, Panama Barro Colorado (central Panama) in 19th century eastern 1/2 cleared 1903-1914 construction of Panama Canal dammed the Chagras river to form Gatun Lake (flooded lowlands) Barro Colorado became a landbridge island (15 sq km) In 1923 designated a biological reserve At present, BCI supports fewer species of birds (375 originally versus 209 at present), among other taxa. M3.12 BIO 3115 Université d’Ottawa / University of Ottawa M3 2009-2010.6 BIO 3115 Conservation Biology Effect of species richness on population abundance and rarity: Trees on Barro Colorado Island, Panama Abundance class (individuals/species) Area 1-9 10-99 100-999 >1000 richness 1 7 27 33 23 58 2 8 35 33 24 3 14 22 43 21 71 4 35 17 39 9 60 114 On BCI, as overall richness of tree community on different plots increases, the proportion of species in the lowest abundance category increases M3.13 BIO 3115 Université d’Ottawa / University of Ottawa Rarity, population abundance and species richness: Moth communities Across N. and C. America, as the number of moth species in an area increases, the proportion having lower abundance increases, and the average abundance decreases (High a diversity is associated with small population sizes). 100 Number of species La Selva, Costa Rica 50 Orono, Maine 1...
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