Interannual variability in feeding rate and niche breadth of radiated shanny (Ulvaria subbifurcata) larvae from coastal Newfoundland
Using 6 years of data for radiated shanny ( Ulvaria subbifurcata ) larvae from coastal Newfoundland, we examine relationships between prey availability, specific consumption rates (SPC) and niche breadth ( S ) as a function of both larval size and cohort. We also examine the extent to which specific...
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fthighwire:oai:open-archive.highwire.org:plankt:32/6/815 2023-05-15T17:21:46+02:00 Interannual variability in feeding rate and niche breadth of radiated shanny (Ulvaria subbifurcata) larvae from coastal Newfoundland Young, Kelly V. Pepin, Pierre Dower, John F. 2010-06-01 00:00:00.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/32/6/815 https://doi.org/10.1093/plankt/fbq007 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/32/6/815 http://dx.doi.org/10.1093/plankt/fbq007 Copyright (C) 2010, Oxford University Press ORIGINAL ARTICLES TEXT 2010 fthighwire https://doi.org/10.1093/plankt/fbq007 2013-05-27T04:24:59Z Using 6 years of data for radiated shanny ( Ulvaria subbifurcata ) larvae from coastal Newfoundland, we examine relationships between prey availability, specific consumption rates (SPC) and niche breadth ( S ) as a function of both larval size and cohort. We also examine the extent to which specific consumption rates correlate with interannual variations in otolith-based estimates of average growth rate (mm day−1) and variability in individual growth rates. In all years, we observed an ontogenetic dietary shift, from nauplii to larger copepods, as the Ulvaria larvae grew. There were significant differences in SPC both across size categories and among years. There was also a significant increase in S with increasing body size in most years. There was a positive, but variable, correlation between SPC and average growth rates for small- and intermediate-sized fish, but no significant relationship with variability in individual growth rates. Overall, we found that foraging success increased with larval size, whereby the majority of large larvae were feeding above maintenance levels while small larvae fed at or below maintenance levels. Food limitation may therefore be an important factor that directly affects the mortality of small, but not necessarily large, larvae. Coupled with the observed ontogenetic change in diet, quantifying the relationship between food availability and larval growth will thus depend not only on prey availability, but also on the size-based foraging abilities of larval fish. Text Newfoundland Copepods HighWire Press (Stanford University) Journal of Plankton Research 32 6 815 827 |
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HighWire Press (Stanford University) |
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English |
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ORIGINAL ARTICLES |
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ORIGINAL ARTICLES Young, Kelly V. Pepin, Pierre Dower, John F. Interannual variability in feeding rate and niche breadth of radiated shanny (Ulvaria subbifurcata) larvae from coastal Newfoundland |
topic_facet |
ORIGINAL ARTICLES |
description |
Using 6 years of data for radiated shanny ( Ulvaria subbifurcata ) larvae from coastal Newfoundland, we examine relationships between prey availability, specific consumption rates (SPC) and niche breadth ( S ) as a function of both larval size and cohort. We also examine the extent to which specific consumption rates correlate with interannual variations in otolith-based estimates of average growth rate (mm day−1) and variability in individual growth rates. In all years, we observed an ontogenetic dietary shift, from nauplii to larger copepods, as the Ulvaria larvae grew. There were significant differences in SPC both across size categories and among years. There was also a significant increase in S with increasing body size in most years. There was a positive, but variable, correlation between SPC and average growth rates for small- and intermediate-sized fish, but no significant relationship with variability in individual growth rates. Overall, we found that foraging success increased with larval size, whereby the majority of large larvae were feeding above maintenance levels while small larvae fed at or below maintenance levels. Food limitation may therefore be an important factor that directly affects the mortality of small, but not necessarily large, larvae. Coupled with the observed ontogenetic change in diet, quantifying the relationship between food availability and larval growth will thus depend not only on prey availability, but also on the size-based foraging abilities of larval fish. |
format |
Text |
author |
Young, Kelly V. Pepin, Pierre Dower, John F. |
author_facet |
Young, Kelly V. Pepin, Pierre Dower, John F. |
author_sort |
Young, Kelly V. |
title |
Interannual variability in feeding rate and niche breadth of radiated shanny (Ulvaria subbifurcata) larvae from coastal Newfoundland |
title_short |
Interannual variability in feeding rate and niche breadth of radiated shanny (Ulvaria subbifurcata) larvae from coastal Newfoundland |
title_full |
Interannual variability in feeding rate and niche breadth of radiated shanny (Ulvaria subbifurcata) larvae from coastal Newfoundland |
title_fullStr |
Interannual variability in feeding rate and niche breadth of radiated shanny (Ulvaria subbifurcata) larvae from coastal Newfoundland |
title_full_unstemmed |
Interannual variability in feeding rate and niche breadth of radiated shanny (Ulvaria subbifurcata) larvae from coastal Newfoundland |
title_sort |
interannual variability in feeding rate and niche breadth of radiated shanny (ulvaria subbifurcata) larvae from coastal newfoundland |
publisher |
Oxford University Press |
publishDate |
2010 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/32/6/815 https://doi.org/10.1093/plankt/fbq007 |
genre |
Newfoundland Copepods |
genre_facet |
Newfoundland Copepods |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/32/6/815 http://dx.doi.org/10.1093/plankt/fbq007 |
op_rights |
Copyright (C) 2010, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/fbq007 |
container_title |
Journal of Plankton Research |
container_volume |
32 |
container_issue |
6 |
container_start_page |
815 |
op_container_end_page |
827 |
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1766107423975669760 |