Influence of variability in larval development on recruitment success in the euphausiid Euphausia pacifica : elasticity and sensitivity analyses |
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Authors: | S M Rumsey P J S Franks |
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Institution: | (1) Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92093-0218, USA Fax: +1 (0) 619 822-0562 e-mail: srumsey@ucsd.edu, US |
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Abstract: | Simple life-history models were employed to identify those larval stages of Euphausia pacifica (Hansen) with the greatest potential contribution to variability in recruitment success. Using stage-specific vital parameters
(i.e. stage duration and specific mortality) the models explored the influence of developmental variability without ascribing
the variability to any particular cause or forcing. Through such a non-mechanistic modelling approach, the critical periods
in larval development were determined. The results led to inferences about larval population responses to temperature/food
heterogeneity in the natural environment. Peaks in recruitment-success elasticity were evident for variability imposed during
the egg and Furcilia I and II stages. The high elasticity of the egg stage suggested the importance of female nutrition and
the timing and location of egg release in determining their viability and subsequent recruitment success. Peak elasticity
during the Furcilia I and II stages supported the notion that indirect developmental pathways of pleopod development during
these stages may be associated with diminished recruitment success. Sensitivity analyses further highlighted the influence
of these early furcilia stages in determining recruitment success, and also suggested the importance of the Furcilia III and
VII stages. The robustness of elasticity and sensitivity results with respect to the life-history structure utilized is discussed.
A criterion is presented for the identification of life-history structures which might obscure the true elasticity relationships
of a developmental sequence.
Received: 27 April 1998 / Accepted: 14 September 1998 |
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