NDLI: Sexual selection vs ecological causation in a sexually dimorphic caecilian, Schistometopum thomense (Amphibia Gymnophiona Caeciliidae)

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Sexual selection vs ecological causation in a sexually dimorphic caecilian, Schistometopum thomense (Amphibia Gymnophiona Caeciliidae)

Content Provider	Semantic Scholar
Author	Delêtre, Marc Measey, G. John
Copyright Year	2004
Abstract	Determination of the proximate cause of sexual dimorphism remains difficult, especially when trying to discriminate between sexual selection and ecological causation. A clear rejection of one of these hypotheses would advance the direction of future investigations, especially for cryptic and/or subterranean species. Sexual dimorphism in head size, but not body size, is confirmed for Schistometopum thomense, a fossorial caecilian from the island of São Tomé, in the Gulf of Guinea. However, a quantitative and qualitative study of diet reveals no significant difference between males and females sampled from three sites on the island. Females appear to take larger and heavier prey (principally earthworms) than males, despite having a significantly smaller head size. We tentatively reject the ecological causation hypothesis, and discuss several testable hypotheses for evidence of sexual selection.
Starting Page	243
Ending Page	253
Page Count	11
File Format	PDF HTM / HTML
DOI	10.1080/08927014.2004.9522635
Alternate Webpage(s)	http://john.measey.com/media/8ab0d19b-9385-4828-96ba-a3cce433a6a2/kuHVuA/PDFs/Deletre_Measey_2004.pdf
Alternate Webpage(s)	http://john.measey.com/pdf/Deletre_Measey_2004.pdf
Alternate Webpage(s)	https://doi.org/10.1080/08927014.2004.9522635
Volume Number	16
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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