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Abundance, recruitment and residency of two sparids in an intermittently open estuary in South Africa
James, N.P.; Cowley, P.D.; Whitfield, A.K. (2007). Abundance, recruitment and residency of two sparids in an intermittently open estuary in South Africa. Afr. J. Mar. Sci. 29(3): 527-538
In: African Journal of Marine Science. NISC: Grahamstown. ISSN 1814-232X , more
Peer reviewed article

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Keyword
    Marine

Authors  Top 
  • James, N.P.
  • Cowley, P.D.
  • Whitfield, A.K.

Abstract
    The recruitment of distinct year-class cohorts in two sparid species, Rhabdosargus holubi and Lithognathus lithognathus, were linked to records of daily mouth state in the intermittently open East Kleinemonde Estuary, South Africa, between 1995 and 2006. L. lithognathus only recruited into the estuary in years when the mouth opened between late August and January. This was attributed to a limited spawning season and inability to recruit during wave overwash events. In contrast, R. holubi recruitment was uninterrupted and not influenced by seasonality of estuary access opportunities (mouthopening and overwash events). Estuarine-dependent residency periods ranged from 27 months to 48 months for L. lithognathus and 12 months to 23 months for R. holubi. The interannual abundances of these estuarydependent sparids were determined by reproductive seasonality, recruitment strategy and seasonal timing of estuarine access opportunities.

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