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Population variation in the trophic niche of the Trinidadian guppy from different predation regimes

E. Zandonà, CM. Dalton, RW. El-Sabaawi, JL. Howard, MC. Marshall, SS. Kilham, DN. Reznick, J. Travis, TJ. Kohler, AS. Flecker, SA. Thomas, CM. Pringle,

. 2017 ; 7 (1) : 5770. [pub] 20170718

Jazyk angličtina Země Anglie, Velká Británie

Typ dokumentu časopisecké články, práce podpořená grantem, Research Support, U.S. Gov't, Non-P.H.S.

Perzistentní odkaz   https://www.medvik.cz/link/bmc19013120

Population variation in trophic niche is widespread among organisms and is of increasing interest given its role in both speciation and adaptation to changing environments. Trinidadian guppies (Poecilia reticulata) inhabiting stream reaches with different predation regimes have rapidly evolved divergent life history traits. Here, we investigated the effects of both predation and resource availability on guppy trophic niches by evaluating their gut contents, resource standing stocks, and δ15N and δ13C stable isotopes across five streams during the wet season. We found that guppies from low predation (LP) sites had a consistently higher trophic position and proportion of invertebrates in their guts and assimilate less epilithon than guppies from high predation (HP) sites. Higher trophic position was also associated with lower benthic invertebrate availability. Our results suggest that LP guppies could be more efficient invertebrate consumers, possibly as an evolutionary response to greater intraspecific competition for higher quality food. This may be intensified by seasonality, as wet season conditions can alter resource availability, feeding rates, and the intensity of intraspecific competition. Understanding how guppy diets vary among communities is critical to elucidating the role of niche shifts in mediating the link between environmental change and the evolution of life histories.

Citace poskytuje Crossref.org

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$a Zandonà, Eugenia $u Department of Biology, Drexel University, Philadelphia, PA, 19104, USA. eugenia.zandona@gmail.com. Department of Ecology - IBRAG, Universidade do Estado do, Rio de Janeiro, RJ, 20550-013, Brazil. eugenia.zandona@gmail.com.
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$a Population variation in trophic niche is widespread among organisms and is of increasing interest given its role in both speciation and adaptation to changing environments. Trinidadian guppies (Poecilia reticulata) inhabiting stream reaches with different predation regimes have rapidly evolved divergent life history traits. Here, we investigated the effects of both predation and resource availability on guppy trophic niches by evaluating their gut contents, resource standing stocks, and δ15N and δ13C stable isotopes across five streams during the wet season. We found that guppies from low predation (LP) sites had a consistently higher trophic position and proportion of invertebrates in their guts and assimilate less epilithon than guppies from high predation (HP) sites. Higher trophic position was also associated with lower benthic invertebrate availability. Our results suggest that LP guppies could be more efficient invertebrate consumers, possibly as an evolutionary response to greater intraspecific competition for higher quality food. This may be intensified by seasonality, as wet season conditions can alter resource availability, feeding rates, and the intensity of intraspecific competition. Understanding how guppy diets vary among communities is critical to elucidating the role of niche shifts in mediating the link between environmental change and the evolution of life histories.
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$a Dalton, Christopher M $u Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, 14853, USA.
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$a El-Sabaawi, Rana W $u Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, 14853, USA. Department of Biology, University of Victoria, PO Box 1700 Station CSC, Victoria, BC, V8W 2Y2, Canada.
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$a Howard, Jason L $u Department of Biology, Drexel University, Philadelphia, PA, 19104, USA. Department of Biological Sciences, Florida International University, Miami, FL, 33199, USA.
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$a Marshall, Michael C $u Odum School of Ecology, University of Georgia, Athens, GA, 30602, USA.
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$a Kilham, Susan S $u Department of Biology, Drexel University, Philadelphia, PA, 19104, USA.
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$a Reznick, David N $u Department of Biology, University of California, Riverside, CA, 92521, USA.
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$a Kohler, Tyler J $u School of Natural Resources, University of Nebraska, Lincoln, NE, 68583, USA. Faculty of Science, Department of Ecology, Charles University in Prague, Viničná 7, Prague, 2 - 128 44, Czech Republic.
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$a Flecker, Alexander S $u Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, 14853, USA.
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$a Thomas, Steven A $u School of Natural Resources, University of Nebraska, Lincoln, NE, 68583, USA.
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$a Pringle, Catherine M $u Odum School of Ecology, University of Georgia, Athens, GA, 30602, USA.
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