Life history variation in capelin (Mallotus villosus) - a forage fish in the north Atlantic
Capelin (Mallotus villosus) is the key forage fish in the north Atlantic. A short-term anomalous event in Newfoundland waters in the early 1990’s caused many changes to their biology, including excursions into alternate (subtidal) spawning habitats. Subtidal spawning sites have drastically different...
Published in: | Journal of Experimental Marine Biology and Ecology |
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Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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Elsevier - Journal of Experimental Marine Biology and Ecology
2013
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Online Access: | http://hdl.handle.net/1993/23300 |
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ftunivmanitoba:oai:mspace.lib.umanitoba.ca:1993/23300 2023-06-18T03:41:47+02:00 Life history variation in capelin (Mallotus villosus) - a forage fish in the north Atlantic Penton, Paulette Davoren, Gail (Biological Sciences) Docker, Margaret (Biological Sciences, formerly Zoology) Piercey-Normore, Michele (Biological Sciences, formerly Botany) Chambers, Christopher (National Marine Fisheries Services) 2013-07 application/pdf http://hdl.handle.net/1993/23300 eng eng Elsevier - Journal of Experimental Marine Biology and Ecology Springer-Verlag - Marine Biology Penton P and Davoren GK. 2013. A common garden experiment on capelin (Mallotus villosus early life history stages to examine use of beach and deep-water spawning habitats. Journal of Experimental Marine Biology and Ecology 439: 54-60. doi:10.1016/j.jembe.2012.10.009 Penton P and Davoren GK. 2013. Capelin (Mallotus villosus) fecundity in post-1990s coastal Newfoundland. Marine Biology 160: 1625-1632. doi:10.1007/s00227-013-2215-7 http://hdl.handle.net/1993/23300 open access Reproductive biology spawning habitat forage fish life history doctoral thesis 2013 ftunivmanitoba https://doi.org/10.1016/j.jembe.2012.10.00910.1007/s00227-013-2215-7 2023-06-04T17:37:10Z Capelin (Mallotus villosus) is the key forage fish in the north Atlantic. A short-term anomalous event in Newfoundland waters in the early 1990’s caused many changes to their biology, including excursions into alternate (subtidal) spawning habitats. Subtidal spawning sites have drastically different environmental conditions than the beach sites that they have been using since at least the 1940’s. This thesis examines various aspects of the reproductive biology of capelin to understand the mechanisms underlying the use of two environmentally divergent spawning habitats. Local adaptation in early life history stages was examined by raising artificially fertilized capelin eggs across three temperatures that capelin are likely to encounter at both spawning habitats. At cool to medium temperatures, larvae experienced higher hatching success, were larger at hatching and had more nutritional reserves relative to warm temperature conditions. There was no evidence of local adaptation, providing the first support for a facultative spawning strategy. The influence of global warming temperatures may be buffered through the utilization of either spawning habitat provided it is within this thermal optimum. A comparative analysis of adult body shape and condition between the two habitats provided further evidence that spawning habitat use in a given year is facultative. Patterns in fecundity drastically changed for capelin since it was last examined prior to the 1990’s. In addition to lower average population fecundity, a wide range of fecundities was also observed across all length-classes. I show that the strong relationship between length and fecundity in capelin has broken down in recent years, making easily collected size measurements an inappropriate proxy for the reproductive potential of this fish. Within-female variation in offspring size and developmental duration was higher when compared to among-female variation. This supports diversified bet-hedging in capelin, a strategy that would allow capelin to spawn in ... Doctoral or Postdoctoral Thesis Newfoundland North Atlantic MSpace at the University of Manitoba Journal of Experimental Marine Biology and Ecology 439 54 60 |
institution |
Open Polar |
collection |
MSpace at the University of Manitoba |
op_collection_id |
ftunivmanitoba |
language |
English |
topic |
Reproductive biology spawning habitat forage fish life history |
spellingShingle |
Reproductive biology spawning habitat forage fish life history Penton, Paulette Life history variation in capelin (Mallotus villosus) - a forage fish in the north Atlantic |
topic_facet |
Reproductive biology spawning habitat forage fish life history |
description |
Capelin (Mallotus villosus) is the key forage fish in the north Atlantic. A short-term anomalous event in Newfoundland waters in the early 1990’s caused many changes to their biology, including excursions into alternate (subtidal) spawning habitats. Subtidal spawning sites have drastically different environmental conditions than the beach sites that they have been using since at least the 1940’s. This thesis examines various aspects of the reproductive biology of capelin to understand the mechanisms underlying the use of two environmentally divergent spawning habitats. Local adaptation in early life history stages was examined by raising artificially fertilized capelin eggs across three temperatures that capelin are likely to encounter at both spawning habitats. At cool to medium temperatures, larvae experienced higher hatching success, were larger at hatching and had more nutritional reserves relative to warm temperature conditions. There was no evidence of local adaptation, providing the first support for a facultative spawning strategy. The influence of global warming temperatures may be buffered through the utilization of either spawning habitat provided it is within this thermal optimum. A comparative analysis of adult body shape and condition between the two habitats provided further evidence that spawning habitat use in a given year is facultative. Patterns in fecundity drastically changed for capelin since it was last examined prior to the 1990’s. In addition to lower average population fecundity, a wide range of fecundities was also observed across all length-classes. I show that the strong relationship between length and fecundity in capelin has broken down in recent years, making easily collected size measurements an inappropriate proxy for the reproductive potential of this fish. Within-female variation in offspring size and developmental duration was higher when compared to among-female variation. This supports diversified bet-hedging in capelin, a strategy that would allow capelin to spawn in ... |
author2 |
Davoren, Gail (Biological Sciences) Docker, Margaret (Biological Sciences, formerly Zoology) Piercey-Normore, Michele (Biological Sciences, formerly Botany) Chambers, Christopher (National Marine Fisheries Services) |
format |
Doctoral or Postdoctoral Thesis |
author |
Penton, Paulette |
author_facet |
Penton, Paulette |
author_sort |
Penton, Paulette |
title |
Life history variation in capelin (Mallotus villosus) - a forage fish in the north Atlantic |
title_short |
Life history variation in capelin (Mallotus villosus) - a forage fish in the north Atlantic |
title_full |
Life history variation in capelin (Mallotus villosus) - a forage fish in the north Atlantic |
title_fullStr |
Life history variation in capelin (Mallotus villosus) - a forage fish in the north Atlantic |
title_full_unstemmed |
Life history variation in capelin (Mallotus villosus) - a forage fish in the north Atlantic |
title_sort |
life history variation in capelin (mallotus villosus) - a forage fish in the north atlantic |
publisher |
Elsevier - Journal of Experimental Marine Biology and Ecology |
publishDate |
2013 |
url |
http://hdl.handle.net/1993/23300 |
genre |
Newfoundland North Atlantic |
genre_facet |
Newfoundland North Atlantic |
op_relation |
Penton P and Davoren GK. 2013. A common garden experiment on capelin (Mallotus villosus early life history stages to examine use of beach and deep-water spawning habitats. Journal of Experimental Marine Biology and Ecology 439: 54-60. doi:10.1016/j.jembe.2012.10.009 Penton P and Davoren GK. 2013. Capelin (Mallotus villosus) fecundity in post-1990s coastal Newfoundland. Marine Biology 160: 1625-1632. doi:10.1007/s00227-013-2215-7 http://hdl.handle.net/1993/23300 |
op_rights |
open access |
op_doi |
https://doi.org/10.1016/j.jembe.2012.10.00910.1007/s00227-013-2215-7 |
container_title |
Journal of Experimental Marine Biology and Ecology |
container_volume |
439 |
container_start_page |
54 |
op_container_end_page |
60 |
_version_ |
1769007458579120128 |