Scaling of the fast-start escape response of juvenile bluegills
Zoology, ISSN: 0944-2006, Vol: 119, Issue: 6, Page: 518-525
2016
- 2Citations
- 19Captures
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Article Description
Morphology, size and physiological properties change markedly across fish ontogeny. This impacts locomotor performance and organismal fitness, although the effects are unpredictable due to the complexity of phenotype–function relationships. Morphological and behavioral changes with growth are often paralleled by changes in habitat use, diet and vulnerability to predators. Our goal was to quantify the changes in external morphology and escape performance throughout post-larval development in bluegill sunfish ( Lepomis macrochirus ), and place these changes in context with known changes in habitat use in the field. Development into adult ecomorphs is associated with phenotypic plasticity in response to habitat-specific differences in diet. On this basis, we hypothesized that variation in morphology and performance would increase during bluegill ontogeny as diversification of adult ecomorphs occurred. However, we found that variation in phenotype and escape performance decreased during early ontogeny. Phenotypic variation expanded later in development, after fish gained access to the variety of habitats and food types that may favor phenotypic plasticity. Performance is predicted to decline with growth due to the differential scaling of inertia and cross-sectional area, a major determinant of muscle force. In contrast, acceleration increased with size, and velocity and acceleration increased more rapidly with size than predicted. Post-larval maturation in bluegill featured a shift to a deeper body shape, and an increase in the relative size of the anal and caudal fins. This was a likely factor in the deviation of escape performance scaling relationships from predictions based on geometric similarity.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0944200616300319; http://dx.doi.org/10.1016/j.zool.2016.05.006; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84976482449&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/27263833; https://linkinghub.elsevier.com/retrieve/pii/S0944200616300319; https://dx.doi.org/10.1016/j.zool.2016.05.006
Elsevier BV
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