Abrupt environmental shift associated with changes in the distribution of Cape anchovy Engraulis encrasicolus spawners in the southern Benguela
| dc.contributor.author | Roy, C | |
| dc.contributor.author | van der Lingen, C D | |
| dc.contributor.author | Coetzee, J C | |
| dc.contributor.author | Lutjeharms, J R E | |
| dc.date.accessioned | 2018-09-21T09:44:46Z | |
| dc.date.available | 2018-09-21T09:44:46Z | |
| dc.date.issued | 2007 | |
| dc.date.updated | 2016-01-22T09:30:16Z | |
| dc.description.abstract | Cape anchovy Engraulis encrasicolus spawners in the southern Benguela showed an eastward shift in their distribution on the Agulhas Bank that occurred abruptly in 1996 and has since persisted. We assessed whether this shift was environmentally mediated by examining sea surface temperature data from different regions of the Agulhas Bank, which showed that in 1996 the inner shelf of the Agulhas Bank to the east of Cape Agulhas abruptly became 0.5°C colder than in previous years and has since remained that way. In addition, signals, coherent with the 1996 shift recorded in sea surface temperatures, were also found in atmospheric surface pressure and zonal wind data for that region; interannual coastal SST variability is also shown to be correlated with zonal wind-stress forcing. As a result, increased wind-induced coastal upwelling east of Cape Agulhas is proposed as the main driver of the observed cooling in the coastal region. The synchrony between the environmental and biological signals suggests that the eastward shift in anchovy spawner distribution was environmentally mediated and arose from a change in environmental forcing that altered the relative favourability for spawning between regions to the west and east of Cape Agulhas. The results highlight how a relatively minor change in environmental conditions can lead to a drastic spatial reorganisation of the life history of one species in an ecosystem. | |
| dc.identifier | http://dx.doi.org/10.2989/AJMS.2007.29.3.1.331 | |
| dc.identifier.apacitation | Roy, C., van der Lingen, C. D., Coetzee, J. C., & Lutjeharms, J. R. E. (2007). Abrupt environmental shift associated with changes in the distribution of Cape anchovy Engraulis encrasicolus spawners in the southern Benguela. <i>African Journal of Marine Science</i>, http://hdl.handle.net/11427/28489 | en_ZA |
| dc.identifier.chicagocitation | Roy, C, C D van der Lingen, J C Coetzee, and J R E Lutjeharms "Abrupt environmental shift associated with changes in the distribution of Cape anchovy Engraulis encrasicolus spawners in the southern Benguela." <i>African Journal of Marine Science</i> (2007) http://hdl.handle.net/11427/28489 | en_ZA |
| dc.identifier.citation | Roy, C., Van der Lingen, C. D., Coetzee, J. C., & Lutjeharms, J. R. E. (2007). Abrupt environmental shift associated with changes in the distribution of Cape anchovy Engraulis encrasicolus spawners in the southern Benguela. African Journal of Marine Science, 29(3), 309-319. | |
| dc.identifier.ris | TY - AU - Roy, C AU - van der Lingen, C D AU - Coetzee, J C AU - Lutjeharms, J R E AB - Cape anchovy Engraulis encrasicolus spawners in the southern Benguela showed an eastward shift in their distribution on the Agulhas Bank that occurred abruptly in 1996 and has since persisted. We assessed whether this shift was environmentally mediated by examining sea surface temperature data from different regions of the Agulhas Bank, which showed that in 1996 the inner shelf of the Agulhas Bank to the east of Cape Agulhas abruptly became 0.5°C colder than in previous years and has since remained that way. In addition, signals, coherent with the 1996 shift recorded in sea surface temperatures, were also found in atmospheric surface pressure and zonal wind data for that region; interannual coastal SST variability is also shown to be correlated with zonal wind-stress forcing. As a result, increased wind-induced coastal upwelling east of Cape Agulhas is proposed as the main driver of the observed cooling in the coastal region. The synchrony between the environmental and biological signals suggests that the eastward shift in anchovy spawner distribution was environmentally mediated and arose from a change in environmental forcing that altered the relative favourability for spawning between regions to the west and east of Cape Agulhas. The results highlight how a relatively minor change in environmental conditions can lead to a drastic spatial reorganisation of the life history of one species in an ecosystem. DA - 2007 DB - OpenUCT DP - University of Cape Town J1 - African Journal of Marine Science LK - https://open.uct.ac.za PB - University of Cape Town PY - 2007 T1 - Abrupt environmental shift associated with changes in the distribution of Cape anchovy Engraulis encrasicolus spawners in the southern Benguela TI - Abrupt environmental shift associated with changes in the distribution of Cape anchovy Engraulis encrasicolus spawners in the southern Benguela UR - http://hdl.handle.net/11427/28489 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/28489 | |
| dc.identifier.vancouvercitation | Roy C, van der Lingen CD, Coetzee JC, Lutjeharms JRE. Abrupt environmental shift associated with changes in the distribution of Cape anchovy Engraulis encrasicolus spawners in the southern Benguela. African Journal of Marine Science. 2007; http://hdl.handle.net/11427/28489. | en_ZA |
| dc.language.iso | eng | |
| dc.publisher.department | Department of Biological Sciences | en_ZA |
| dc.publisher.faculty | Faculty of Science | en_ZA |
| dc.publisher.institution | University of Cape Town | |
| dc.source | African Journal of Marine Science | |
| dc.source.uri | https://www.tandfonline.com/loi/tams20 | |
| dc.subject.other | Agulhas Bank | |
| dc.subject.other | anchovy | |
| dc.subject.other | Cape Agulhas | |
| dc.subject.other | distributional shifts | |
| dc.subject.other | Engraulis encrasicolus | |
| dc.subject.other | environmental variability | |
| dc.subject.other | southern Benguela | |
| dc.title | Abrupt environmental shift associated with changes in the distribution of Cape anchovy Engraulis encrasicolus spawners in the southern Benguela | |
| dc.type | Journal Article | |
| uct.type.filetype | Text | |
| uct.type.filetype | Image |