Image_5_The energetic cost of early reproductive development in juvenile Antarctic krill at the Western Antarctic Peninsula.jpeg
The overwinter survival mechanisms of Antarctic krill, Euphausia superba, are poorly characterized, especially for juveniles. It has been suggested that juveniles adopt a mix of strategies characteristic of both larvae and adults. Like larvae, they may feed opportunistically throughout winter when f...
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Online Access: | https://doi.org/10.3389/fmars.2022.1009385.s006 https://figshare.com/articles/figure/Image_5_The_energetic_cost_of_early_reproductive_development_in_juvenile_Antarctic_krill_at_the_Western_Antarctic_Peninsula_jpeg/21701582 |
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ftfrontimediafig:oai:figshare.com:article/21701582 2023-05-15T13:50:38+02:00 Image_5_The energetic cost of early reproductive development in juvenile Antarctic krill at the Western Antarctic Peninsula.jpeg Kirsten B. Steinke Kim S. Bernard Julia M. Fontana Louise A. Copeman Lani M. Garcia 2022-12-09T12:04:00Z https://doi.org/10.3389/fmars.2022.1009385.s006 https://figshare.com/articles/figure/Image_5_The_energetic_cost_of_early_reproductive_development_in_juvenile_Antarctic_krill_at_the_Western_Antarctic_Peninsula_jpeg/21701582 unknown doi:10.3389/fmars.2022.1009385.s006 https://figshare.com/articles/figure/Image_5_The_energetic_cost_of_early_reproductive_development_in_juvenile_Antarctic_krill_at_the_Western_Antarctic_Peninsula_jpeg/21701582 CC BY 4.0 CC-BY Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Antarctic krill reproduction energy juvenile trade-off body condition Image Figure 2022 ftfrontimediafig https://doi.org/10.3389/fmars.2022.1009385.s006 2022-12-15T00:10:30Z The overwinter survival mechanisms of Antarctic krill, Euphausia superba, are poorly characterized, especially for juveniles. It has been suggested that juveniles adopt a mix of strategies characteristic of both larvae and adults. Like larvae, they may feed opportunistically throughout winter when food is available, and like adults they may be able to suppress their metabolism when food is scarce. In this study we look at the overwinter strategies of juvenile krill and how their reproductive development changes when energy input exceeds what is necessary for survival. We take a closer look at how the sexual maturation of juvenile krill progresses in response to different environmental conditions throughout the fall and winter. We exposed juvenile Antarctic krill to four different “food environment scenarios”, supplementing them with various diets from May to September 2019 that were representative of environmental conditions that they may encounter in different regions of the Western Antarctic Peninsula during autumn and winter. Each month, we measured the physiology and condition of the krill, and assessed the reproductive development of females. We found that when female juvenile krill have greater energy reserves than what is needed to survive the winter, they will begin to sexually mature. Further, when there are sufficient levels of the fatty acids eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA) and 16:4 (n-1), krill are likely to be in a more reproductive advanced stage. However, when lipids, EPA, DHA and 16:4 (n-1) are depleted throughout the winter, juvenile female krill lose their ability to develop reproductively. We also found that sexual development is an energy intensive process that requires high respiration rates in juvenile krill. Furthermore, when juvenile females expend energy maturing, their physiological condition declines. This trade-off between early reproductive development and condition in juvenile female krill has important implications for individual health and population ... Still Image Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Frontiers: Figshare Antarctic Antarctic Peninsula |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Antarctic krill reproduction energy juvenile trade-off body condition |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Antarctic krill reproduction energy juvenile trade-off body condition Kirsten B. Steinke Kim S. Bernard Julia M. Fontana Louise A. Copeman Lani M. Garcia Image_5_The energetic cost of early reproductive development in juvenile Antarctic krill at the Western Antarctic Peninsula.jpeg |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Antarctic krill reproduction energy juvenile trade-off body condition |
description |
The overwinter survival mechanisms of Antarctic krill, Euphausia superba, are poorly characterized, especially for juveniles. It has been suggested that juveniles adopt a mix of strategies characteristic of both larvae and adults. Like larvae, they may feed opportunistically throughout winter when food is available, and like adults they may be able to suppress their metabolism when food is scarce. In this study we look at the overwinter strategies of juvenile krill and how their reproductive development changes when energy input exceeds what is necessary for survival. We take a closer look at how the sexual maturation of juvenile krill progresses in response to different environmental conditions throughout the fall and winter. We exposed juvenile Antarctic krill to four different “food environment scenarios”, supplementing them with various diets from May to September 2019 that were representative of environmental conditions that they may encounter in different regions of the Western Antarctic Peninsula during autumn and winter. Each month, we measured the physiology and condition of the krill, and assessed the reproductive development of females. We found that when female juvenile krill have greater energy reserves than what is needed to survive the winter, they will begin to sexually mature. Further, when there are sufficient levels of the fatty acids eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA) and 16:4 (n-1), krill are likely to be in a more reproductive advanced stage. However, when lipids, EPA, DHA and 16:4 (n-1) are depleted throughout the winter, juvenile female krill lose their ability to develop reproductively. We also found that sexual development is an energy intensive process that requires high respiration rates in juvenile krill. Furthermore, when juvenile females expend energy maturing, their physiological condition declines. This trade-off between early reproductive development and condition in juvenile female krill has important implications for individual health and population ... |
format |
Still Image |
author |
Kirsten B. Steinke Kim S. Bernard Julia M. Fontana Louise A. Copeman Lani M. Garcia |
author_facet |
Kirsten B. Steinke Kim S. Bernard Julia M. Fontana Louise A. Copeman Lani M. Garcia |
author_sort |
Kirsten B. Steinke |
title |
Image_5_The energetic cost of early reproductive development in juvenile Antarctic krill at the Western Antarctic Peninsula.jpeg |
title_short |
Image_5_The energetic cost of early reproductive development in juvenile Antarctic krill at the Western Antarctic Peninsula.jpeg |
title_full |
Image_5_The energetic cost of early reproductive development in juvenile Antarctic krill at the Western Antarctic Peninsula.jpeg |
title_fullStr |
Image_5_The energetic cost of early reproductive development in juvenile Antarctic krill at the Western Antarctic Peninsula.jpeg |
title_full_unstemmed |
Image_5_The energetic cost of early reproductive development in juvenile Antarctic krill at the Western Antarctic Peninsula.jpeg |
title_sort |
image_5_the energetic cost of early reproductive development in juvenile antarctic krill at the western antarctic peninsula.jpeg |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.1009385.s006 https://figshare.com/articles/figure/Image_5_The_energetic_cost_of_early_reproductive_development_in_juvenile_Antarctic_krill_at_the_Western_Antarctic_Peninsula_jpeg/21701582 |
geographic |
Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba |
op_relation |
doi:10.3389/fmars.2022.1009385.s006 https://figshare.com/articles/figure/Image_5_The_energetic_cost_of_early_reproductive_development_in_juvenile_Antarctic_krill_at_the_Western_Antarctic_Peninsula_jpeg/21701582 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2022.1009385.s006 |
_version_ |
1766253791713165312 |