Population variation in the trophic niche of the Trinidadian guppy from different predation regimes
Abstract 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 evol...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2017-07-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-017-06163-6 |
| _version_ | 1818420427600429056 |
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| author | Eugenia Zandonà Christopher M. Dalton Rana W. El-Sabaawi Jason L. Howard Michael C. Marshall Susan S. Kilham David N. Reznick Joseph Travis Tyler J. Kohler Alexander S. Flecker Steven A. Thomas Catherine M. Pringle |
| author_facet | Eugenia Zandonà Christopher M. Dalton Rana W. El-Sabaawi Jason L. Howard Michael C. Marshall Susan S. Kilham David N. Reznick Joseph Travis Tyler J. Kohler Alexander S. Flecker Steven A. Thomas Catherine M. Pringle |
| author_sort | Eugenia Zandonà |
| collection | DOAJ |
| description | Abstract 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. |
| first_indexed | 2024-12-14T12:54:18Z |
| format | Article |
| id | doaj.art-aad6803c9e9e4d5da2c8ee60b4a548e7 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-14T12:54:18Z |
| publishDate | 2017-07-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-aad6803c9e9e4d5da2c8ee60b4a548e72022-12-21T23:00:37ZengNature PortfolioScientific Reports2045-23222017-07-017111110.1038/s41598-017-06163-6Population variation in the trophic niche of the Trinidadian guppy from different predation regimesEugenia Zandonà0Christopher M. Dalton1Rana W. El-Sabaawi2Jason L. Howard3Michael C. Marshall4Susan S. Kilham5David N. Reznick6Joseph Travis7Tyler J. Kohler8Alexander S. Flecker9Steven A. Thomas10Catherine M. Pringle11Department of Biology, Drexel UniversityEcology and Evolutionary Biology, Cornell UniversityEcology and Evolutionary Biology, Cornell UniversityDepartment of Biology, Drexel UniversityOdum School of Ecology, University of GeorgiaDepartment of Biology, Drexel UniversityDepartment of Biology, University of CaliforniaDepartment of Biological Science, Florida State UniversitySchool of Natural Resources, University of NebraskaEcology and Evolutionary Biology, Cornell UniversitySchool of Natural Resources, University of NebraskaOdum School of Ecology, University of GeorgiaAbstract 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.https://doi.org/10.1038/s41598-017-06163-6 |
| spellingShingle | Eugenia Zandonà Christopher M. Dalton Rana W. El-Sabaawi Jason L. Howard Michael C. Marshall Susan S. Kilham David N. Reznick Joseph Travis Tyler J. Kohler Alexander S. Flecker Steven A. Thomas Catherine M. Pringle Population variation in the trophic niche of the Trinidadian guppy from different predation regimes Scientific Reports |
| title | Population variation in the trophic niche of the Trinidadian guppy from different predation regimes |
| title_full | Population variation in the trophic niche of the Trinidadian guppy from different predation regimes |
| title_fullStr | Population variation in the trophic niche of the Trinidadian guppy from different predation regimes |
| title_full_unstemmed | Population variation in the trophic niche of the Trinidadian guppy from different predation regimes |
| title_short | Population variation in the trophic niche of the Trinidadian guppy from different predation regimes |
| title_sort | population variation in the trophic niche of the trinidadian guppy from different predation regimes |
| url | https://doi.org/10.1038/s41598-017-06163-6 |
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