DNA barcoding identifies a cosmopolitan diet in the ocean sunfish

Sousa, LL; Xavier, R; Costa, V; Humphries, NE; Trueman, C; Rosa, R; Sims, DW; Queiroz, N. 2016 DNA barcoding identifies a cosmopolitan diet in the ocean sunfish. Scientific Reports, 6. 28762. 10.1038/srep28762

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Official URL: http://dx.doi.org/10.1038/srep28762

Abstract/Summary

The ocean sunfish (Mola mola) is the world’s heaviest bony fish reaching a body mass of up to 2.3 tonnes. However, the prey M. mola consumes to fuel this prodigious growth remains poorly known. Sunfish were thought to be obligate gelatinous plankton feeders, but recent studies suggest a more generalist diet. In this study, through molecular barcoding and for the first time, the diet of sunfish in the north-east Atlantic Ocean was characterised. Overall, DNA from the diet content of 57 individuals was successfully amplified, identifying 41 different prey items. Sunfish fed mainly on crustaceans and teleosts, with cnidarians comprising only 16% of the consumed prey. Although no adult fishes were sampled, we found evidence for an ontogenetic shift in the diet, with smaller individuals feeding mainly on small crustaceans and teleost fish, whereas the diet of larger fish included more cnidarian species. Our results confirm that smaller sunfish feed predominantly on benthic and on coastal pelagic species, whereas larger fish depend on pelagic prey. Therefore, sunfish is a generalist predator with a greater diversity of links in coastal food webs than previously realised. Its removal as fisheries’ bycatch may have wider reaching ecological consequences, potentially disrupting coastal trophic interactions.

Item Type: Publication - Article
Additional Keywords: and
Subjects: Biology
Ecology and Environment
Marine Sciences
Divisions: Marine Biological Association of the UK > Ecosystems and Environmental Change > Movement ecology, behaviour and population structure
Depositing User: Nick Humphries
Date made live: 13 Sep 2016 11:58
Last Modified: 06 Jun 2017 16:17
URI: http://plymsea.ac.uk/id/eprint/7160

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