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1 January 2014 Feeding Effectiveness of Megaphobema mesomelas (Araneae, Theraphosidae) on Two Prey Types
Scott Kosiba, Pablo Allen, Gilbert Barrantes
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Prey selection is essential for individual fitness; therefore, it would be expected that a predator would select prey of a higher rank (energy/time) when exposed to prey of differing quality. In this paper, we compare the feeding effectiveness (biomass consumed/time) of Megaphobema mesomelas (O. P.-Cambridge, 1892) in captivity, and the preference between two prey types: beetles and crickets. Spiders are more effective when feeding on crickets. The heavy exoskeleton of beetles increases prey-handling time in order to access a relatively smaller amount of edible tissue. Effectiveness also increases with spider and prey size (mass), with larger spiders feeding more effectively on larger prey. Spiders show a strong preference for feeding upon crickets over beetles when both prey types are offered at the same time.

Scott Kosiba, Pablo Allen, and Gilbert Barrantes "Feeding Effectiveness of Megaphobema mesomelas (Araneae, Theraphosidae) on Two Prey Types," Arachnology 15(7), 228-230, (1 January 2014).
Published: 1 January 2014

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