Evidence of iteroparity in the widely distributed diadromous fish inanga Galaxias maculatus and potential implications for reproductive output
| Autor: | J. C. B. Stevens, David R. Schiel, Michael J. H. Hickford |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Fish migration biology Ecology 010604 marine biology & hydrobiology Marine habitats Aquatic Science biology.organism_classification Fecundity 010603 evolutionary biology 01 natural sciences Fishery Galaxias maculatus Habitat Reproductive biology Whitebait Ecology Evolution Behavior and Systematics Semelparity and iteroparity |
| Zdroj: | Journal of Fish Biology. 89:1931-1946 |
| ISSN: | 0022-1112 |
| DOI: | 10.1111/jfb.13083 |
| Popis: | Gaps in understanding variability among populations of inanga Galaxias maculatus in the timing of reproduction were addressed in southern New Zealand (NZ), where G. maculatus constitutes a declining fishery. Reproductive activity was delayed by 1 month on the west coast compared with the east coast and the west coast spawning season was prolonged into winter. The evidence for post-spawning survival of some fish was unequivocal from histological studies. These older and larger fish contributed disproportionately to egg production. Estimates of fecundity were considerably lower than those previously calculated for NZ populations. The importance of quality habitats being available during critical life history periods are highlighted. It was apparent that some streams supported fish that were larger and in better condition and that this translated into greatly increased fecundity. Future research should focus on whether this is a legacy of these fish experiencing better pre-settlement marine habitat as larvae, or higher quality instream habitat enhancing the growth and development of adults. |
| Databáze: | OpenAIRE |
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