|
OceanDocs >
Africa >
Namibia >
NatMIRC >
Articles >
Por favor, use este identificador para citar o enlazar este ítem:
http://hdl.handle.net/1834/2124
|
| Título : | A Comparison Of Condition Factor And Gonadosomatic Index Of Sardine Sardinops Sagax Stocks In The Northern And Southern Benguela Upwelling Ecosystems, 1984–1999 |
| Autor : | Van der Lingen, C.D.
Kreiner, A.
Fréon, P. |
| ASFA Terms: | Abstracts
Ecosystems
Sardine fisheries |
| Fecha de publicación : | 2001 |
| Editorial : | Department of Environmental Affairs and Tourism |
| Citación : | South African Journal Marine Science, 23. p. 123-134 |
| Resumen : | Time-series of condition factor (CF) and gonadosomatic index (GSI) were generated using general linear models
(GLM) for sardine Sardinops sagax stocks in the northern and southern Benguela ecosystems over the period
1984–1999. During this period the biomass of sardine in the northern Benguela remained at relatively low levels
of <500 000 tons, whereas that of southern Benguela sardine increased 40-fold to 1.3 million tons. The GLMs
explained 27 and 45% of the observed variation in CF, and 32 and 28% of the observed variation in GSI, for
sardine in the northern and southern Benguela subsystems respectively. Whereas the sardine CF in the northern
Benguela remained stable over time, that for the southern Benguela stock declined steadily during the study
period. Sardine CF showed a seasonal cycle in the southern but not in the northern Benguela. Time-series of
GSI showed high interannual variability but no trends in either subsystem, and the seasonal pattern was similar
for both stocks. The lack of coherence between the CF time-series for sardine in the two subsystems further
suggests that sardine stocks in the northern and southern Benguela subsystems are independent. |
| URI : | http://hdl.handle.net/1834/2124 |
| Related document: | http://www.ajol.info/viewarticle.php?id=28120 |
| ISSN : | 1814-232X |
| Aparece en las colecciones: | Articles
|
Los ítems de DSpace están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.
|
