Measured and inferred gross energy content in diapausing Calanus spp. in a Scotian shelf basin
Calanus finmarchicus stage-C5 and C. hyperboreus stage-C4 diapausing in Scotian Shelf basins are high-quality food sources because they are abundant and high in energy content. When combined, these two variables are informative for quantifying energy density, carrying capacity and energy transfer in...
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fthighwire:oai:open-archive.highwire.org:plankt:fbs031v1 2023-05-15T15:48:02+02:00 Measured and inferred gross energy content in diapausing Calanus spp. in a Scotian shelf basin Davies, Kimberley T.A. Ryan, Amy Taggart, Christopher T. 2012-05-02 08:44:11.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/fbs031v1 https://doi.org/10.1093/plankt/fbs031 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/fbs031v1 http://dx.doi.org/10.1093/plankt/fbs031 Copyright (C) 2012, Oxford University Press Article TEXT 2012 fthighwire https://doi.org/10.1093/plankt/fbs031 2016-11-16T18:35:52Z Calanus finmarchicus stage-C5 and C. hyperboreus stage-C4 diapausing in Scotian Shelf basins are high-quality food sources because they are abundant and high in energy content. When combined, these two variables are informative for quantifying energy density, carrying capacity and energy transfer in marine ecosystems. However, measuring energy content directly can be difficult and expensive. Here, we present energy (caloric) content estimates for two co-located diapausing copepod species; C. finmarchicus C5 and C. hyperboreus C4 collected during late-summer when their energy content is at or near the annual maximum. We then develop several practical energy content calibrations, each designed to estimate energy content using simple measures of Calanus spp. body size or weight. Weight-specific energy content (energy quality, kJ g−1) did not differ between C. finmarchicus and C. hyperboreus i.e. body size explained the majority of inter-species variation in individual energy content (J ind.−1). Energy content estimated directly using calorimetry did not differ from energy inferred from oil sac volume (OSV), demonstrating that energy content can be inferred when direct energy estimates are unavailable. We also assess the effect of formalin preservation on energy content to determine the utility of using archived samples when addressing energy-related questions. There was no difference between directly measured energy content in frozen- and formalin-preserved specimens. However, formalin preservation appears to alter oil sac shape in C. hyperboreus , thereby altering energy content estimates inferred from OSV for the species. Formalin-preserved samples can be used for direct energy content estimation if individuals with intact oil sacs are selected. Text Calanus finmarchicus HighWire Press (Stanford University) Journal of Plankton Research 34 7 614 625 |
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Article Davies, Kimberley T.A. Ryan, Amy Taggart, Christopher T. Measured and inferred gross energy content in diapausing Calanus spp. in a Scotian shelf basin |
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description |
Calanus finmarchicus stage-C5 and C. hyperboreus stage-C4 diapausing in Scotian Shelf basins are high-quality food sources because they are abundant and high in energy content. When combined, these two variables are informative for quantifying energy density, carrying capacity and energy transfer in marine ecosystems. However, measuring energy content directly can be difficult and expensive. Here, we present energy (caloric) content estimates for two co-located diapausing copepod species; C. finmarchicus C5 and C. hyperboreus C4 collected during late-summer when their energy content is at or near the annual maximum. We then develop several practical energy content calibrations, each designed to estimate energy content using simple measures of Calanus spp. body size or weight. Weight-specific energy content (energy quality, kJ g−1) did not differ between C. finmarchicus and C. hyperboreus i.e. body size explained the majority of inter-species variation in individual energy content (J ind.−1). Energy content estimated directly using calorimetry did not differ from energy inferred from oil sac volume (OSV), demonstrating that energy content can be inferred when direct energy estimates are unavailable. We also assess the effect of formalin preservation on energy content to determine the utility of using archived samples when addressing energy-related questions. There was no difference between directly measured energy content in frozen- and formalin-preserved specimens. However, formalin preservation appears to alter oil sac shape in C. hyperboreus , thereby altering energy content estimates inferred from OSV for the species. Formalin-preserved samples can be used for direct energy content estimation if individuals with intact oil sacs are selected. |
format |
Text |
author |
Davies, Kimberley T.A. Ryan, Amy Taggart, Christopher T. |
author_facet |
Davies, Kimberley T.A. Ryan, Amy Taggart, Christopher T. |
author_sort |
Davies, Kimberley T.A. |
title |
Measured and inferred gross energy content in diapausing Calanus spp. in a Scotian shelf basin |
title_short |
Measured and inferred gross energy content in diapausing Calanus spp. in a Scotian shelf basin |
title_full |
Measured and inferred gross energy content in diapausing Calanus spp. in a Scotian shelf basin |
title_fullStr |
Measured and inferred gross energy content in diapausing Calanus spp. in a Scotian shelf basin |
title_full_unstemmed |
Measured and inferred gross energy content in diapausing Calanus spp. in a Scotian shelf basin |
title_sort |
measured and inferred gross energy content in diapausing calanus spp. in a scotian shelf basin |
publisher |
Oxford University Press |
publishDate |
2012 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/fbs031v1 https://doi.org/10.1093/plankt/fbs031 |
genre |
Calanus finmarchicus |
genre_facet |
Calanus finmarchicus |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/fbs031v1 http://dx.doi.org/10.1093/plankt/fbs031 |
op_rights |
Copyright (C) 2012, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/fbs031 |
container_title |
Journal of Plankton Research |
container_volume |
34 |
container_issue |
7 |
container_start_page |
614 |
op_container_end_page |
625 |
_version_ |
1766383037275176960 |