Have recent mass mortalities of the sardine Sardinops sagax facilitated an expansion in the distribution and abundance of the anchovy Engraulis australis in South Australia?

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dc.contributor.authorWard, T.
dc.contributor.authorHoedt, F.
dc.contributor.authorMcLeay, L.
dc.contributor.authorDimmlich, W.
dc.contributor.authorJackson, G.
dc.contributor.authorRogers, P.
dc.contributor.authorJones, K.
dc.date.issued2001
dc.descriptionCopyright © 2001 Inter-Research
dc.description.abstractThis paper examines the hypotheses (1) that Sardinops sagax and Engraulis australis are spatially segregated and do not interact directly, and (2) that recent mass mortalities of S. sagax have facilitated an expansion in the distribution and abundance of E. australis. In South Australian waters, S. sagax and E. australis both spawn during summer and autumn. Eggs and larvae of both species occur over the continental shelf, and are abundant in areas where upwelling occurs (e.g. off the Coffin Bay Peninsula and the western tip of Kangaroo Island) and frontal systems form (e.g. in Investigator Strait and the entrance of Spencer Gulf). After the mass- mortality events in 1995 and 1998, eggs and larvae of S. sagax were confined mainly to these areas, and estimates of the total abundance of S. sagax eggs and larvae in South Australian waters fell by between 48 and 83% respectively. Between 1996 and 1999, densities of E. australis eggs and larvae increased in both key spawning areas and the central and eastern Great Australian Bight, and total abundance of eggs and larvae increased by over 215 and 285% respectively. These results indicate that (1) S. sagax and E. australis are not spatially segregated and may interact directly, and (2) the mass mortalities of S. sagax may have facilitated an expansion in the distribution and abundance of E. australis. Hence, fluctuations in the relative abundance of S. sagax and Engraulis spp. observed in the world¹s productive boundary-current systems may also be possible in Australian waters.
dc.description.statementofresponsibilityT. M. Ward, F. Hoedt, L. McLeay, W. F. Dimmlich, G. Jackson, P. J. Rogers, K. Jones
dc.identifier.citationMarine Ecology Progress Series, 2001; 220:241-251
dc.identifier.doi10.3354/meps220241
dc.identifier.issn0171-8630
dc.identifier.issn1616-1599
dc.identifier.urihttp://hdl.handle.net/2440/12248
dc.language.isoen
dc.publisherInter-research
dc.source.urihttps://doi.org/10.3354/meps220241
dc.subjectSardine
dc.subjectAnchovy
dc.subjectDistribution and abundance
dc.subjectEggs and larvae
dc.subjectdepth
dc.subjectTemperature
dc.subjectSpawning Season
dc.subjectSpawning Area
dc.subjectCompetition
dc.titleHave recent mass mortalities of the sardine Sardinops sagax facilitated an expansion in the distribution and abundance of the anchovy Engraulis australis in South Australia?
dc.typeJournal article
pubs.publication-statusPublished

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