Trophodynamics of Southern Ocean pteropods on the southern Kerguelen Plateau

Ecology and Evolution
Christine K WeldrickKerrie M Swadling

Abstract

Pteropods are a group of small marine gastropods that are highly sensitive to multiple stressors associated with climate change. Their trophic ecology is not well studied, with most research having focused primarily on the effects of ocean acidification on their fragile, aragonite shells. Stable isotopes analysis coupled with isotope-based Bayesian niche metrics is useful for characterizing the trophic structure of biological assemblages. These approaches have not been implemented for pteropod assemblages. We used isotope-based Bayesian niche metrics to investigate the trophic relationships of three co-occurring pteropod species, with distinct feeding behaviors, sampled from the Southern Kerguelen Plateau area in the Indian Sector of the Southern Ocean-a biologically and economically important but poorly studied region. Two of these species were gymnosomes (shell-less pteropods), which are traditionally regarded as specialist predators on other pteropods, and the third species was a thecosome (shelled pteropod), which are typically generalist omnivores. For each species, we aimed to understand (a) variability and overlap among isotopic niches; and (b) whether there was a relationship between body size and trophic position. Obse...Continue Reading

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Jan 13, 2019·Rapid Communications in Mass Spectrometry : RCM·Christine K WeldrickKerrie M Swadling

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Methods Mentioned

BETA
chemical stress

Software Mentioned

R package tRophicPosition
R
Fiji
R ( SIBER )
nicheRover
ImageJ
SIBER
Stable Isotope Bayesian Ellipses package
R Development Core Team

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