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

Title: Population variation in the trophic niche of the Trinidadian guppy from different predation regimes.
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Name(s): Zandonà, Eugenia, author
Dalton, Christopher M, author
El-Sabaawi, Rana W, author
Howard, Jason L, author
Marshall, Michael C, author
Kilham, Susan S, author
Reznick, David N, author
Travis, Joseph, author
Kohler, Tyler J, author
Flecker, Alexander S, author
Thomas, Steven A, author
Pringle, Catherine M, author
Type of Resource: text
Genre: Journal Article
Text
Date Issued: 2017-07-18
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: 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 δN and δC 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.
Identifier: FSU_pmch_28720857 (IID), 10.1038/s41598-017-06163-6 (DOI), PMC5515894 (PMCID), 28720857 (RID), 28720857 (EID), 10.1038/s41598-017-06163-6 (PII)
Publication Note: This NIH-funded author manuscript originally appeared in PubMed Central at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5515894.
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_pmch_28720857
Owner Institution: FSU
Is Part Of: Scientific reports.
2045-2322
Issue: iss. 1, vol. 7

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Zandonà, E., Dalton, C. M., El-Sabaawi, R. W., Howard, J. L., Marshall, M. C., Kilham, S. S., … Pringle, C. M. (2017). Population variation in the trophic niche of the Trinidadian guppy from different predation regimes. Scientific Reports. Retrieved from http://purl.flvc.org/fsu/fd/FSU_pmch_28720857