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Ontogenetic trends in resource partitioning and trophic geography of sympatric skates (Rajidae) inferred from stable isotope composition across eye lenses

Ontogenetic trends in resource partitioning and trophic geography of sympatric skates (Rajidae) inferred from stable isotope composition across eye lenses
Ontogenetic trends in resource partitioning and trophic geography of sympatric skates (Rajidae) inferred from stable isotope composition across eye lenses

Resource partitioning is expected in sympatric assemblages of predators as a mechanism that reduces competition between individuals of different species or age classes, which in turn can affect population and community interactions as well as resource distribution and availability. However, for species such as benthic skates (Rajidae), the juveniles of which are cryptic and not easily sampled by traditional survey methods, there is a knowledge gap concerning the spatial and trophic ecology during early life stages. The eye lenses of vertebrates grow over their lifetime providing a chronological biochemical record that can be used to infer differences in diet and/or foraging location (trophic geography) throughout the ontogeny of the animal. For the first time, eye lenses of 4 sympatric Rajidae species from the northeast Atlantic were successfully used to recover stable isotope life histories for individual skates. Isotopic separation among species and across life stages within species suggests that habitat partitioning and differences in trophic ecology are present throughout ontogeny. Isotopic data imply that adults are separated from juveniles both spatially and in terms of their diet and the 4 species appear to partition resources more than expected based on previous studies.

Carbon, Nitrogen, Raja spp, Ray, Sclerochronology, Skate, Stable isotopes
0171-8630
103-116
Simpson, Samantha J.
362aed0b-bfb2-418e-8e3c-e36fa04cfcab
Sims, David W.
7234b444-25e2-4bd5-8348-a1c142d0cf81
Trueman, Clive N.
d00d3bd6-a47b-4d47-89ae-841c3d506205
Simpson, Samantha J.
362aed0b-bfb2-418e-8e3c-e36fa04cfcab
Sims, David W.
7234b444-25e2-4bd5-8348-a1c142d0cf81
Trueman, Clive N.
d00d3bd6-a47b-4d47-89ae-841c3d506205

Simpson, Samantha J., Sims, David W. and Trueman, Clive N. (2019) Ontogenetic trends in resource partitioning and trophic geography of sympatric skates (Rajidae) inferred from stable isotope composition across eye lenses. Marine Ecology Progress Series, 624, 103-116. (doi:10.3354/meps13030).

Record type: Article

Abstract

Resource partitioning is expected in sympatric assemblages of predators as a mechanism that reduces competition between individuals of different species or age classes, which in turn can affect population and community interactions as well as resource distribution and availability. However, for species such as benthic skates (Rajidae), the juveniles of which are cryptic and not easily sampled by traditional survey methods, there is a knowledge gap concerning the spatial and trophic ecology during early life stages. The eye lenses of vertebrates grow over their lifetime providing a chronological biochemical record that can be used to infer differences in diet and/or foraging location (trophic geography) throughout the ontogeny of the animal. For the first time, eye lenses of 4 sympatric Rajidae species from the northeast Atlantic were successfully used to recover stable isotope life histories for individual skates. Isotopic separation among species and across life stages within species suggests that habitat partitioning and differences in trophic ecology are present throughout ontogeny. Isotopic data imply that adults are separated from juveniles both spatially and in terms of their diet and the 4 species appear to partition resources more than expected based on previous studies.

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More information

Accepted/In Press date: 11 June 2019
e-pub ahead of print date: 15 August 2019
Keywords: Carbon, Nitrogen, Raja spp, Ray, Sclerochronology, Skate, Stable isotopes

Identifiers

Local EPrints ID: 436163
URI: http://eprints.soton.ac.uk/id/eprint/436163
ISSN: 0171-8630
PURE UUID: d7fa13bf-329f-4255-904f-49c683a71a38

Catalogue record

Date deposited: 29 Nov 2019 17:31
Last modified: 07 Oct 2020 00:53

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