| Autor: |
Carscadden, J. E., Frank, K. T., Leggett, W. C. |
| Předmět: |
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| Zdroj: |
ICES Journal of Marine Science / Journal du Conseil; Apr2000, Vol. 57 Issue 2, p412-418, 7p, 4 Graphs |
| Abstrakt: |
An earlier study reported that recruitment of the 1966–1978 year classes of beach-spawning capelin (Mallotus villosus) in NAFO Div. 2J3K was significantly correlated with onshore winds that facilitate larval emergence from the spawning beaches (WIND) and post-emergent sea surface temperatures during the first 6 months of pelagic life (TEMPSUM). We used this relationship to predict recruitment for the 1979–1990 year classes and found that these estimates were not significantly correlated with observed year-class abundance. However, there was a significant correlation when two outlying year classes were omitted. A new relationship was developed between survival (ln fraction recruitment/spawning stock biomass) and the original independent variables for the period 1974–1990. The new model was not significant (p=0.06) but for the individual independent variables, WIND was significant (p=0.04) and TEMPSUM was not (p=0.24). With WIND as the sole predictor, 25% of the variation in survival was explained (r=−0.50, p=0.04). The continued influence of WIND on pre-recruit survival of capelin is not an unexpected result considering that the mechanism linking wind effects to larval survival was established during intensive field studies. In contrast, TEMPSUM was derived through correlation analysis supported by a biologically plausible, but unproven, explanation of its effect on larval survival. We suggest that the retention of WIND in this re-evaluation is significant because it demonstrates that models based on realistic biological mechanisms are more likely to be retained when re-evaluated than are those models derived through exploratory analysis. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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