The Nile perch invasion in Lake Victoria: cause or consequence of the haplochromine decline?

Simple item page
dc.contributor.authorvan Zwieten, P.A.M.
dc.contributor.authorKolding, J.
dc.contributor.authorPlank, M.J.
dc.contributor.authorHecky, R.E.
dc.contributor.authorBridgeman, T.B.
dc.contributor.authorMacIntyre, S.
dc.contributor.authorSeehausen, O.
dc.contributor.authorSilsbe, G.M.
dc.date.accessioned2017-01-09T19:14:45Z
dc.date.available2017-01-09T19:14:45Z
dc.date.issued2016en
dc.description.abstractWe review alternative hypotheses and associated mechanisms to explain Lake Victoria’s Nile perch takeover and concurrent reduction in haplochromines through a (re)analysis of long term climate, limnological and stock observations in comparison with size-spectrum model predictions of co-existence, extinction and demographic change. The empirical observations are in agreement with the outcomes of the model containing two interacting species with life-histories matching Nile perch and a generalized haplochromine. The dynamic interactions may have depended on size related differences in early juvenile mortality: mouth-brooding haplochromines escape predation mortality in early life stages, unlike Nile perch that have miniscule planktonic eggs and larvae. In our model predation on the latter by planktivorous haplochromine fry act as a stabilizing factor for co-existence, but external mortality on the haplochromines would disrupt this balance in favor of Nile perch. To explain the observed switch, mortality on haplochromines would need to be much higher than the fishing mortality that can be realistically re-constructed from observations. Abrupt concomitant changes in algal and zooplankton composition, decreased water column transparency, and widespread hypoxia from increased eutrophication most likely caused haplochromine biomass decline. We hypothesize that the shift to Nile perch was a consequence of an externally caused, climate triggered, decrease in haplochromine biomass and associated recruitment failure rather than a direct cause of the introduction.en
dc.identifier.citationvan Zwieten, P.A.M., Kolding, J., Plank, M.J., Hecky, R.E., Bridgeman, T.B., MacIntyre, S., Seehausen, O., Silsbe, G.M. (2016) The Nile perch invasion in Lake Victoria: cause or consequence of the haplochromine decline?. Canadian Journal of Fisheries and Aquatic Sciences, 73, pp. 1-22.en
dc.identifier.doihttps://doi.org/10.1139/cjfas-2015-0130
dc.identifier.urihttp://hdl.handle.net/10092/13005
dc.language.isoen
dc.publisherUniversity of Canterbury. Mathematics and Statisticsen
dc.rights.urihttps://hdl.handle.net/10092/17651
dc.subjectLakesen
dc.subjectEutrophicationen
dc.subjectPredator-prey interactionen
dc.subjectInvasive speciesen
dc.subjectClimate changeen
dc.subject.anzsrcFields of Research::31 - Biological sciences::3103 - Ecology::310304 - Freshwater ecologyen
dc.subject.anzsrcFields of Research::30 - Agricultural, veterinary and food sciences::3005 - Fisheries sciences::300502 - Aquaculture and fisheries stock assessmenten
dc.subject.anzsrcField of Research::05 - Environmental Sciences::0501 - Ecological Applications::050101 - Ecological Impacts of Climate Changeen
dc.subject.anzsrcFields of Research::41 - Environmental sciences::4102 - Ecological applications::410202 - Biosecurity science and invasive species ecologyen
dc.titleThe Nile perch invasion in Lake Victoria: cause or consequence of the haplochromine decline?en
dc.typeJournal Article
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
12657914_j055_cjfas15.pdf
Size:
3.51 MB
Format:
Adobe Portable Document Format
Download
Collections
Engineering: Journal Articles