| Interactions of bullfrog tadpole predators and an insecticide: predation release and facilitation. | |
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MedLine Citation:
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PMID: 14505025 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effect of a contaminant on a community may not be easily predicted, given that complex changes in food resources and predator-prey dynamics may result. The objectives of our study were to determine the interactive effects of the insecticide carbaryl and predators on body size, development, survival, and activity of tadpoles of the bullfrog (Rana catesbeiana). We conducted the study in cattle tank mesocosm ponds exposed to 0, 3.5, or 7.0 mg/l carbaryl, and no predators or two red-spotted newts (Notophthalmus viridescens), bluegill sunfish (Lepomis macrochirus), or crayfish (Orconectes sp.). Carbaryl negatively affected predator survival by eliminating crayfish from all ponds, and by eliminating bluegill sunfish from ponds exposed to the highest concentration of carbaryl; carbaryl exposure did not effect survival of red-spotted newts. Because crayfish were eliminated by carbaryl, bullfrogs were released from predation and survival was near that of predator controls at low concentrations of carbaryl exposure. High concentrations of carbaryl reduced tadpole survival regardless of whether predators survived carbaryl exposure or not. Presence of crayfish and newts reduced tadpole survival, while bluegill sunfish appeared to facilitate bullfrog tadpole survival. Presence of carbaryl stimulated bullfrog tadpole mass and development. Our study demonstrates that the presence of a contaminant stress can alter community regulation by releasing prey from predators that are vulnerable to contaminants in some exposure scenarios. |
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Authors:
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Michelle D Boone; Raymond D Semlitsch |
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Publication Detail:
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Type: Journal Article Date: 2003-09-23 |
Journal Detail:
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Title: Oecologia Volume: 137 ISSN: 0029-8549 ISO Abbreviation: Oecologia Publication Date: 2003 Dec |
Date Detail:
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Created Date: 2003-11-17 Completed Date: 2004-03-16 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 0150372 Medline TA: Oecologia Country: Germany |
Other Details:
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Languages: eng Pagination: 610-6 Citation Subset: IM |
Affiliation:
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Division of Biological Sciences, University of Missouri, 105 Tucker Hall, Columbia, MO 65211, USA. michelle_boone@usgs.gov |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Astacoidea Body Constitution Carbaryl / poisoning* Food Chain Insecticides / poisoning* Larva / growth & development Notophthalmus viridescens Perciformes Population Dynamics Predatory Behavior* Rana catesbeiana / growth & development* Survival Analysis Water Pollutants, Chemical / poisoning* |
| Chemical | |
Reg. No./Substance:
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0/Insecticides; 0/Water Pollutants, Chemical; 63-25-2/Carbaryl |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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