n African Zoology - Juvenile population dynamics of in an intermittently open estuary at the limit of its natural distribution - : short communication

Volume 43, Issue 2
  • ISSN : 1562-7020
  • E-ISSN: 2224-073X
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Juvenile in the 25 ha, temperate, intermittently open, East Kleinemonde Estuary in the Eastern Cape, South Africa (33°32'S, 27°03'E), showed a seasonal shift in distribution, occupying all areas of the estuary in summer and, subsequently, being limited to the upper reaches in winter. The young of the year in the littoral zone were rapidly depleted and resultant estimates of the instantaneous rate of total mortality (Z) ranged from 5.4 / yr to 6.9 / yr. High annual rates of juvenile mortality and small adult populations imply that stock recovery after a reduction in adult population numbers, through activities such as fishing, may be slow. This work adds to the knowledge base of ecology and population dynamics in temperate estuaries at the limit of its natural distribution.

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