Overlap in utilization of juvenile Cape Horse Mackerel by Cape Fur Seals and the purse-seine fishery in Namibia

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dc.contributor.authorMecenero, Silvia
dc.contributor.authorUnderhill, Les G
dc.contributor.authorKrakstad, Jens-Otto
dc.contributor.authorKirkman, Stephen P
dc.contributor.authorRoux, Jean-Paul
dc.date.accessioned2016-01-21T06:38:16Z
dc.date.available2016-01-21T06:38:16Z
dc.date.issued2007
dc.date.updated2016-01-19T08:25:54Z
dc.description.abstractThe Cape horse mackerel Trachurus trachurus capensisis one of Namibia's most valuable fish stocks, and an important component to the diet of Cape fur seals, Arctocephalus pusillus pusillus, off northern Namibia. The level of overlap in the utilization of this resource between seals and the purse-seine fishery was investigated using two overlap indices. For high overlap measures, seals and the purse-seine fishery utilized age-2 horse mackerel. For low overlap measures, seals mainly consumed age-0 fish whereas the fishery caught age-2 fish. Both indices were adjusted by the proportion of horse mackerel in the seal diet, with the assumption that the proportion consumed by the seals reflects the abundance of horse mackerel in the coastal waters of Cape Cross, Namibia. Both unadjusted and adjusted overlap indices showed that overlap between seals and the fishery in their utilization of juvenile horse mackerel was high only at times when horse mackerel abundance was high, and low when abundance was small. Confidence intervals and significance testing were included. Overall, there was little overlap between seals and the purse-seine fishery. This study provides important information that should be taken into account in the management of the horse mackerel resource.en_ZA
dc.identifier.apacitationMecenero, S., Underhill, L. G., Krakstad, J., Kirkman, S. P., & Roux, J. (2007). Overlap in utilization of juvenile Cape Horse Mackerel by Cape Fur Seals and the purse-seine fishery in Namibia. <i>South African Journal of Wildlife Research</i>, http://hdl.handle.net/11427/16469en_ZA
dc.identifier.chicagocitationMecenero, Silvia, Les G Underhill, Jens-Otto Krakstad, Stephen P Kirkman, and Jean-Paul Roux "Overlap in utilization of juvenile Cape Horse Mackerel by Cape Fur Seals and the purse-seine fishery in Namibia." <i>South African Journal of Wildlife Research</i> (2007) http://hdl.handle.net/11427/16469en_ZA
dc.identifier.citationMecenero, S., Underhill, L. G., Krakstad, J. O., Kirkman, S. P., & Roux, J. P. (2007). Overlap in utilization of juvenile Cape horse mackerel by Cape fur seals and the purse-seine fishery in Namibia. South African Journal of Wildlife Research, 37(1), 17-29.en_ZA
dc.identifier.issn2410-7220
dc.identifier.ris TY - Journal Article AU - Mecenero, Silvia AU - Underhill, Les G AU - Krakstad, Jens-Otto AU - Kirkman, Stephen P AU - Roux, Jean-Paul AB - The Cape horse mackerel Trachurus trachurus capensisis one of Namibia's most valuable fish stocks, and an important component to the diet of Cape fur seals, Arctocephalus pusillus pusillus, off northern Namibia. The level of overlap in the utilization of this resource between seals and the purse-seine fishery was investigated using two overlap indices. For high overlap measures, seals and the purse-seine fishery utilized age-2 horse mackerel. For low overlap measures, seals mainly consumed age-0 fish whereas the fishery caught age-2 fish. Both indices were adjusted by the proportion of horse mackerel in the seal diet, with the assumption that the proportion consumed by the seals reflects the abundance of horse mackerel in the coastal waters of Cape Cross, Namibia. Both unadjusted and adjusted overlap indices showed that overlap between seals and the fishery in their utilization of juvenile horse mackerel was high only at times when horse mackerel abundance was high, and low when abundance was small. Confidence intervals and significance testing were included. Overall, there was little overlap between seals and the purse-seine fishery. This study provides important information that should be taken into account in the management of the horse mackerel resource. DA - 2007 DB - OpenUCT DP - University of Cape Town J1 - South African Journal of Wildlife Research LK - https://open.uct.ac.za PB - University of Cape Town PY - 2007 SM - 2410-7220 T1 - Overlap in utilization of juvenile Cape Horse Mackerel by Cape Fur Seals and the purse-seine fishery in Namibia TI - Overlap in utilization of juvenile Cape Horse Mackerel by Cape Fur Seals and the purse-seine fishery in Namibia UR - http://hdl.handle.net/11427/16469 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/16469
dc.identifier.vancouvercitationMecenero S, Underhill LG, Krakstad J, Kirkman SP, Roux J. Overlap in utilization of juvenile Cape Horse Mackerel by Cape Fur Seals and the purse-seine fishery in Namibia. South African Journal of Wildlife Research. 2007; http://hdl.handle.net/11427/16469.en_ZA
dc.languageeng
dc.publisherSouthern African Wildlife Management Associationen_ZA
dc.publisher.departmentAnimal Demography Unit (ADU)en_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.sourceSouth African Journal of Wildlife Researchen_ZA
dc.source.urihttp://www.sawma.co.za/
dc.subject.otherCape fur seal, Arctocephalus pusillus pusillus, Cape horse mackerel, Trachurus trachurus capensis, Namibia, fishery, diet overlap.
dc.titleOverlap in utilization of juvenile Cape Horse Mackerel by Cape Fur Seals and the purse-seine fishery in Namibiaen_ZA
dc.typeJournal Articleen_ZA
uct.subject.keywordsCape fur sealen_ZA
uct.subject.keywordsCape horse mackerelen_ZA
uct.subject.keywordsNamibiaen_ZA
uct.subject.keywordsfisheryen_ZA
uct.subject.keywordsdiet overlapen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
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