Distribution of marine mammals and its relationship with krill in Bransfield Strait. ANTAR XXI
Keywords:
Marine mammals, krill, Bransfield StraitAbstract
The observations were made along 332.14 nm, during the Expedition Peru Antar XXI, from 15th to 22nd February 2013 along the Bransfield Strait and surroundings of Gibbs island. A total of 86 sightings of marine mammals were recorded: 55 cetaceans and 31 pinnipeds. Out of the 135 individuals of marine mammals; 96 were cetaceans and 39 were pinnipeds. The three species of cetaceans identified belonged to the Family Balaenopteridae: humpback whale (Megaptera novaeangliae), fin whale (Balaenoptera physalus) and minke whale (Balaenoptera bonaerensis). The relative abundances indices were: 0.361 individual per 10 nm observed for fin whales, 0.481 individuals per 10 nm observed minke whales and 0.840 individuals per 10 nm observed for humpback whales. The pinnipeds identified belonged to a single species of the Familiy Otariidae: Antarctic fur seals (Arctocephalus gazella), which accounted for 36.05% of the mammal sightings. Relative abundance of pinnipeds was 1.174 individuals per 10 miles observed. Humpback whales were associated with krill aggregations on top of the water column, while minke whales were associated with krill aggregations in deeper areas.
Downloads
Metrics
References
Boyd I, Mc Cafferty D, Walker T. 1997. Variation in foraging effort by lactating Antarctic fur seals response to simulated increased foraging costs. Behav. Bol. Sociobiol. 40: 135-144.
Buccicardi U, Takahashi D. 2004. Mamíferos antárticos en el estrecho de Bransfield y alrededores de isla Elefante. Verano austral 2003. Inf Inst Mar Perú 32(4): 373-379.
Friedlaender A S, Lawson G L, Halpin P N. 2009. Evidence of resource partitioning between humpback and minke whales around the Western Antarctic Peninsula. Marine Mammal Science 25(2): 402-415. April 2009. Society for Marine Mammalogy.
Furness R W, Monaghan P. 1987. Seabird ecology. Blackie and Son Ltd. Glasgow and London. 164 p.
Hunt G L. 1991. Occurrence of polar seabirds at sea in relation to prey concentrations and oceanographic factors In: Proceedings of the Pro Mare Symposium on Polar Marine Ecology, Trondheim, 12-16 May 1990. Sakshaug E, Hopkins CCE, Øritsland NA eds. Polar Research 10(2): 553-559.
Larkin P A. 1996. Concepts and issues in marine ecosystem management. Rev. Fish. Bio. Fish. 6: 139-164.
McCafferty D, Boyd I, Taylor R. 1998. Diving behavior of Antarctic fur seal (Arctocephalus gazella) pups. Can. J. Zool. 6: 513-520.
Ontón K, Vega D, Arias-Schreiber M. 1999. Distribución e Índices de avistamientos de mamíferos marinos y su relación con la abundancia del krill Euphausia superba. Perú ANTAR IX. Inf Inst Mar Perú. N° 145: 63-68.
Santora J A, Reiss C C, Loeb V J, Veit R R. 2010. Spatial association between hotspots of baleen whales and demographic patterns of Antarctic krill Euphasia superba suggests size-dependent predation. Mar. Ecol. Prog. Ser. Vol. 405:255-269.
Santora, J A, Force M P, Ampela K, Van Cise A. 2009. Distribution, abundance and behavior of seabirds and mammals at sea. 2008-2009 Field Season Report. United States Antarctic Marine Living Resources Program. NOAA-TM-NMFS-SWFSC-445. pp 44-48.
Sutherland W J. 1996. Ecological Census Techniques. A Handbook. Cambridge University Press. 336 pp.
Trites A W. 2003. Food webs in the ocean: who eats whom, and how much? In: Responsible Fisheries in the Marine Ecosystem. M. Sinclair M, Valdimarsson G, eds. FAO, Rome and CABI Publishing, Wallingford. pp 125-143.
Trites A W. 2001. Marine mammal trophic levels and interactions. In: Encyclopedia of Ocean Sciences. Academic Press, London. pp. 1628-1633.
Trites A W, Pauly D, Christensen V. 1997. Competition between fisheries and marine mammals for prey and primary production in the Pacific Ocean. Journal of Northwest Atlantic Fishery Science 22: 173-187.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2016 Instituto del Mar del Perú
This work is licensed under a Creative Commons Attribution 4.0 International License.
© Bol Inst Mar Perú. La revista retiene los derechos patrimoniales de los autores con la finalidad de garantizar el acceso abierto de los manuscritos.
Todos los manuscritos publicados en la revista se distribuyen bajo la licencia “Creative Commons Atribución - NoComercial - CompartirIgual 4.0 Internacional” (CC BY-NC-SA 4.0). Implica que autores y lectores pueden de forma gratuita descargar, almacenar, copiar, redistribuir, remezclar, transformar o generar obras derivadas a partir del manuscrito, siempre y cuando mencionen la fuente primaria de publicación y la autoría del manuscrito, así como que se realice sin fines comerciales y se distribuya bajo la misma licencia que el original. Puede consultar desde aquí la versión informativa y el texto legal de la licencia.
