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...

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Autores principales:	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
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/aad6803c9e9e4d5da2c8ee60b4a548e7
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spelling	oai:doaj.org-article:aad6803c9e9e4d5da2c8ee60b4a548e72021-12-02T11:51:13ZPopulation variation in the trophic niche of the Trinidadian guppy from different predation regimes10.1038/s41598-017-06163-62045-2322https://doaj.org/article/aad6803c9e9e4d5da2c8ee60b4a548e72017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06163-6https://doaj.org/toc/2045-2322Abstract 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.Eugenia ZandonàChristopher M. DaltonRana W. El-SabaawiJason L. HowardMichael C. MarshallSusan S. KilhamDavid N. ReznickJoseph TravisTyler J. KohlerAlexander S. FleckerSteven A. ThomasCatherine M. PringleNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q 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
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.
format	article
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
title	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_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_sort	population variation in the trophic niche of the trinidadian guppy from different predation regimes
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/aad6803c9e9e4d5da2c8ee60b4a548e7
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Population variation in the trophic niche of the Trinidadian guppy from different predation regimes

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