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Measurement of swimming ability in larval marine fishes: comparison of critical speed with in situ speed
Citation
Leis, JM, Measurement of swimming ability in larval marine fishes: comparison of critical speed with in situ speed, Marine Ecology - Progress Series, 650 pp. 203-215. ISSN 0171-8630 (2020) [Refereed Article]
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Copyright Statement
© Inter-Research 2020
Abstract
For much of their pelagic larval dispersal (PLD) stage, larval perciform fishes are able to directly influence their dispersal by horizontal swimming, but it is unclear which means of measuring swimming ability is most appropriate for modelling dispersal and studying demographic and genetic connectivity. Most studies use critical speed (Ucrit), a laboratory flume measure derived by increasing flow until larvae can no longer maintain their position. Most swimming ability data on fish larvae are Ucrit, usually for larvae nearing the end of PLD. Recognizing that a forced laboratory measure is inappropriate for dispersal, researchers have used decreased Ucrit values, usually by 50%, and have argued that Ucrit is strongly correlated with more relevant swimming measures. Here I examined the suitability of Ucrit versus in situ speed (ISS), wherein speed of larvae is measured by divers following them in the ocean with a flow meter. Considerations of dispersal require inclusion of swimming ontogeny. Swimming speed regressions of speed on size of 10 species in 8 families showed that Ucrit and ISS are not well correlated. The Ucrit:standard length (SL) slope was greater than the ISS:SL slope in 6 species, and did not differ in the other 4 species. No overall metric, e.g. X% of Ucrit = ISS, was appropriate for conversion of Ucrit to ISS. Conversion of Ucrit to ISS is not straightforward. Ucrit measures swimming potential, not what larvae do in the ocean, whereas ISS directly measures larvae swimming in the ocean. Ucrit ontogeny is less variable, but ISS ontogeny is more relevant to dispersal. Ucrit may be useful for other purposes.
Item Details
Item Type: | Refereed Article |
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Keywords: | larval biology, dispersal, population connectivity, fisheries, in-situ speed, larval behaviour, critical speed |
Research Division: | Biological Sciences |
Research Group: | Ecology |
Research Field: | Marine and estuarine ecology (incl. marine ichthyology) |
Objective Division: | Environmental Management |
Objective Group: | Marine systems and management |
Objective Field: | Marine biodiversity |
UTAS Author: | Leis, JM (Dr Jeff Leis) |
ID Code: | 141001 |
Year Published: | 2020 |
Web of Science® Times Cited: | 7 |
Deposited By: | Ecology and Biodiversity |
Deposited On: | 2020-09-18 |
Last Modified: | 2021-02-15 |
Downloads: | 0 |
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