Literaturdatenbank
Literaturdatenbank |
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Moskovits, D. K. (1988). Sexual dimorphism and population estimates of the two amazonian tortoises (geochelone carbonaria and geochelone denticulata) in northwestern brazil. Herpetologica, 44, 209–217.
Added by: Sarina Wunderlich (13 Oct 2008 21:32:54 UTC) |
| Resource type: Journal Article BibTeX citation key: Moskovits1988 View all bibliographic details  |
Categories: General Keywords: Chelonoidis, Chelonoidis carbonaria, Chelonoidis denticulata, Geochelone, Habitat = habitat, Morphologie = morphology, Schildkröten = turtles + tortoises, Südamerika = South America, Testudinidae Creators: Moskovits Collection: Herpetologica |
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| Abstract |
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Testudinidae Geochelone carbonaria denticulata Geochelone carbonaria and G. denticulata were studied in a rainforest in northwestern Brazil, where the two species are syntopic. During the 20-mo study, 227 tortoises were marked, and G. carbonaria outnumbered G. denticulata by > 5:1. Although more males than females were marked for both species, sex ratios did not differ significantly from 1:1. Sexual dimorphism in size and shape was very pronounced for G. carbonaria but was slight for G. denticulata. The direction of size dimorphism (males larger than females) agrees with predictions of sexual selection theory, and the peculiarities of male shape seem to facilitate mating in G. carbonaria and combat in G. denticulata. Overall, the two species were similar in general body size at Maraca, Brazil, where individuals of G. carbonaria were relatively large compared to museum specimens and literature records from other geographic locations, and G. denticulata were slightly smaller.
Added by: Sarina Wunderlich |