Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/24943
Title: Niche segregation amongst sympatric species at exposed sandy shores with contrasting wrack availabilities illustrated by stable isotopic analysis
Authors: Bessa, Filipa 
Baeta, Alexandra 
Marques, João Carlos 
Keywords: Sandy beach; Primary consumers; Peracarid crustaceans; Diet; Stable isotopes; Niche segregation
Issue Date: 2014
Publisher: Elsevier Ltd.
Serial title, monograph or event: Ecological Indicators
Volume: 36
Abstract: Wrack supplies (macroalgae, seagrasses and carrion) are a common feature of sandy beaches worldwide. These allochthonous inputs are a potential high-quality food subsidy for beach fauna, but little is known about the feeding ecology and niche segregation strategies of these species in beaches with limited wrack availabilities. We used stable isotopic ratios of nitrogen and carbon to examine the diets and niche segregation among three sympatric crustaceans, the amphipods Talitrus saltator and Talorchestia brito, and the isopod Tylos europaeus, in two temperate beaches, Cabedelo and Quiaios, on the Portuguese Atlantic coast, with contrasting wrack availabilities, over winter and summer. In the beach with limited wrack (Quiaios), consumers showed significantly different interspecific and temporal isotopic signatures, suggesting a distinct foraging habitat and niche differentiation. Mixing models outputs (SIAR) revealed in this case a seasonal shift in the diet of consumers from terrestrial sources in winter towards marinebased sources (phytoplankton) in the summer. In contrast, at Cabedelo, consumers showed clear overlap in isotopic signatures, with similar contributions of the available wrack to their diets. As a whole, an opportunistic and generalist feeding behaviour was described for these species, namely for T. saltator. Isotopic profiles support the occurrence of spatial overlap during summer but different foraging strategies of the three species in these beaches during winter. Our results show that on temperate beaches with ephemeral wrack supplies, consumers might need to adopt different foraging strategies and niche segregation for their subsistence, and additionally illustrate the viability of using stable isotopes to capture subtle changes in trophic niches.
URI: http://hdl.handle.net/10316/24943
ISSN: 1470-160X
Rights: openAccess
Appears in Collections:FCTUC Ciências da Vida - Artigos em Revistas Internacionais

Files in This Item:
File Description SizeFormat
1-s2.0-S1470160X13003580-main.pdf1.24 MBAdobe PDFView/Open
Show full item record

Page view(s)

98
checked on Nov 20, 2019

Download(s)

113
checked on Nov 20, 2019

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.