Competitive Interactions in Phytotelmata—Breeding Pools of Two Poison-Dart Frogs (Anura: Dendrobatidae) in Costa Rica

Competition and predation are two of the most important factors structuring communities, and these interactions may be exaggerated when two closely related species share similar resource requirements. We studied size-based habitat selection of artificial phytotelmata for deposition of tadpoles in tw...

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Published inJournal of herpetology Vol. 45; no. 4; pp. 438 - 443
Main Authors Ryan, Mason J, Barry, Deborah S
Format Journal Article
LanguageEnglish
Published P.O. Box 58517, Salt Lake City, Utah 84158, USA Society for the Study of Amphibians and Reptiles 01.12.2011
Subjects
Amphibians
Anura
BEHAVIOR
Biological taxonomies
Breeding
Dendrobates auratus
Dendrobatidae
Ecological competition
Frogs
Granulifera
Habitat selection
Predators
Synecology
Tadpoles
Trophic relationships
Costa Rica
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Abstract Competition and predation are two of the most important factors structuring communities, and these interactions may be exaggerated when two closely related species share similar resource requirements. We studied size-based habitat selection of artificial phytotelmata for deposition of tadpoles in two species of poison-dart frogs, Dendrobates auratus and Oophaga granulifera, in Costa Rica. Dendrobates auratus exhibits male parental care, and its tadpoles are predaceous, whereas O. granulifera exhibits biparental care, and its tadpoles are obligatory trophic egg eaters. These behavioral traits are integral factors in habitat selection for these two species. We found that the predaceous D. auratus selected large- and medium-sized pools, whereas O. granulifera selected all pool sizes but had a preference for small pools. Oophaga granulifera paid a high cost for exploiting large pools experiencing 100% mortality when sharing a pool with D. auratus. The use of small versus large pools in these species is rooted in each species' divergent parental care strategies and tadpole feeding behaviors.
AbstractList Competition and prédation are two of the most important factors structuring communities, and these interactions may be exaggerated when two closely related species share similar resource requirements. We studied size-based habitat selection of artificial phytotelmata for deposition of tadpoles in two species of poison-dart frogs, Dendrobates auratus and Oophaga granulifera, in Costa Rica. Dendrobates auratus exhibits male parental care, and its tadpoles are predaceous, whereas O. granulifera exhibits biparental care, and its tadpoles are obligatory trophic egg eaters. These behavioral traits are integral factors in habitat selection for these two species. We found that the predaceous D. auratus selected large-and medium-sized pools, whereas O. granulifera selected all pool sizes but had a preference for small pools. Oophaga granulifera paid a high cost for exploiting large pools experiencing 100% mortality when sharing a pool with D. auratus. The use of small versus large pools in these species is rooted in each species' divergent parental care strategies and tadpole feeding behaviors.
Competition and predation are two of the most important factors structuring communities, and these interactions may be exaggerated when two closely related species share similar resource requirements. We studied size-based habitat selection of artificial phytotelmata for deposition of tadpoles in two species of poison-dart frogs, Dendrobates auratus and Oophaga granulifera, in Costa Rica. Dendrobates auratus exhibits male parental care, and its tadpoles are predaceous, whereas O. granulifera exhibits biparental care, and its tadpoles are obligatory trophic egg eaters. These behavioral traits are integral factors in habitat selection for these two species. We found that the predaceous D. auratus selected large- and medium-sized pools, whereas O. granulifera selected all pool sizes but had a preference for small pools. Oophaga granulifera paid a high cost for exploiting large pools experiencing 100% mortality when sharing a pool with D. auratus. The use of small versus large pools in these species is rooted in each species' divergent parental care strategies and tadpole feeding behaviors.
Author Barry, Deborah S
Ryan, Mason J
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Competition and prédation are two of the most important factors structuring communities, and these interactions may be exaggerated when two closely related...
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SubjectTerms Amphibians
Anura
BEHAVIOR
Biological taxonomies
Breeding
Dendrobates auratus
Dendrobatidae
Ecological competition
Frogs
Granulifera
Habitat selection
Predators
Synecology
Tadpoles
Trophic relationships
Title Competitive Interactions in Phytotelmata—Breeding Pools of Two Poison-Dart Frogs (Anura: Dendrobatidae) in Costa Rica
URI http://www.bioone.org/doi/abs/10.1670/10-253.1
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