Abstract
The diet of three Patagonotothen species was investigated from the bycatch of near-bottom trawls for squid on the southern Falkland Island shelf. Patagonotothen ramsayi had a moderately diverse diet that was mostly zooplankton, especially amphipods, but included benthos and discards from the fishery, especially squid. P. guntheri also had a moderately diverse zooplankton diet, especially copepods, and benthos and squid damaged by the fishery. The diet of P. tessellata was the most diverse and was mainly benthos, including damaged scallops, with some euphausiids and amphipods. Feeding niche overlap of fish between 10 and 20 cm TL for the three species was between 5.8 and 9.2% for each pair of species, indicating relatively little overlap even though all species scavenged on organisms made available by the fishery. Thus the diet of these three Patagonotothen species indicates substantial feeding niche separation, and that the three species are moderately specialised feeders.
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References
Cortés E (1997) A critical review of methods of studying fish feeding based on analysis of stomach contents: application to the elasmobranch fishes. Can J Fish Aquat Sci 54:726–738
Eastman JT (1993) Antarctic fish biology. Evolution in a unique environment. Academic, San Diego
Eastman JT, Eakin RR (2000) An updated species list for notothenioid fish (Perciformes; Notothenioidei), with comments on Antarctic species. Arch Fish Mar Res 48:11–20
Falkland Islands Government (2002) Fisheries Department Fisheries Statistics, 7, 1993–2002. FIG Fisheries Department, Stanley, Falkland Islands
Hutchinson GE (1965) The ecological theater and the evolutionary play. Yale University Press, New Haven
Kock KH (1992) Antarctic fish and fisheries. Cambridge University Press, Cambridge
Krebs CJ (1989) Ecological methodology. Harper Collins, New York
Laptikhovsky V, Arkhipkin A (2003) An impact of seasonal squid migrations and fishery on the feeding spectra of subantarctic notothenioids Patagonotothen ramsayi and Cottoperca gobio around the Falkland Islands. J Appl Ichthyol 19:35–39
Laptikhovsky V, Fetisov A (1999) Scavenging by fish of discards from the Patagonian squid fishery. Fish Res 41:93–97
Pakhomov EA (1998) Feeding plasticity of the Antarctic fish Trematomus hansoni Boulenger, 1902 (Pisces: Nototheniidae): the influence of fishery waste on the diet. Polar Biol 19:289–292
Zaret TM, Rand S (1971) Competition in tropical stream fishes: support for the competitive exclusion principle. Ecology 52:336–342
Acknowledgements
I would like to thank the crew of FV “Sil” for their valuable help during sampling procedures and their hospitality onboard, Dr. A.W. North for his scrupulous revision of the manuscript, Dr. D. Lloris, Dr. A.I. Arkhipkin, P. Brickle and an anonymous referee for valuable comments, and the Director of Fisheries, John Barton, for supporting this work.
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Laptikhovsky, V.V. A comparative study of diet in three sympatric populations of Patagonotothen species (Pisces: Nototheniidae). Polar Biol 27, 202–205 (2004). https://doi.org/10.1007/s00300-003-0573-1
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DOI: https://doi.org/10.1007/s00300-003-0573-1