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Free Content Large scale pattern of recruitment by the labrid, Semicossyphus pulcher: Causes and implications

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The pattern of recruitment of sheephead, Semicossyphus pulcher, is described throughout a major portion of its range over a period of 7–9 years. The relative recruitment success was determined using both field transects and age-structure data. The observed pattern of recruitment was compared to both spatial and year-to-year variations in the current regime within the region using both average flow data (CalCOFI data base) and satellite imagery. It was found that in areas with larval sources to the north and south, recruitment occurred consistently from year-to-year. However, in areas where there was no larval sources "upstream" of the typical current direction, recruitment was highly variable and dependent upon anomalous events in the current flow. These anomalous events are considered on two levels: low-level events, which last from days to weeks, thereby affecting recruitment of only one or a few species, and high-level events, which last from months to years (e.g. El NiƱo events), affecting recruitment of many species. A positive relationship is found between frequency of recruitment events and density of adult populations. In addition, the persistence of populations is dependent upon recruitment frequency and the longevity of the individuals. The interaction between recruitment frequency, population density and persistence is considered to be important in determining the northern distribution limit of sheephead at Point Conception (also a major break for many other species). In the past, this faunal break has typically been attributed to temperature differences and inferred physiological constraints. It is concluded, from the findings in this study, that the faunal break at Point Conception is heavily influenced by hydrographic constraints on dispersal.

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Document Type: Research Article

Publication date: 01 August 1985

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  • The Journal of Marine Research publishes peer-reviewed research articles covering a broad array of topics in physical, biological and chemical oceanography. Articles that deal with processes, as well as those that report significant observations, are welcome. In the area of biology, studies involving coupling between ecological and physical processes are preferred over those that report systematics. Authors benefit from thorough reviews of their manuscripts, where an attempt is made to maximize clarity. The time between submission and publication is kept to a minimum; there is no page charge.
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