Different feeding strategies in Antarctic scavenging amphipods and their implications for colonisation success in times of retreating glaciers
Abstract Background Scavenger guilds are composed of a variety of species, co-existing in the same habitat and sharing the same niche in the food web. Niche partitioning among them can manifest in different feeding strategies, e.g. during carcass feeding. In the bentho-pelagic realm of the Southern...
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ftdatacite:10.6084/m9.figshare.c.3963249.v1 2023-05-15T13:33:02+02:00 Different feeding strategies in Antarctic scavenging amphipods and their implications for colonisation success in times of retreating glaciers Seefeldt, Meike Campana, Gabriela Deregibus, Dolores Quartino, María Abele, Doris Tollrian, Ralph Held, Christoph 2017 https://dx.doi.org/10.6084/m9.figshare.c.3963249.v1 https://figshare.com/collections/Different_feeding_strategies_in_Antarctic_scavenging_amphipods_and_their_implications_for_colonisation_success_in_times_of_retreating_glaciers/3963249/1 unknown Figshare https://dx.doi.org/10.1186/s12983-017-0248-3 https://dx.doi.org/10.6084/m9.figshare.c.3963249 CC BY 4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Physiology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified Inorganic Chemistry FOS Chemical sciences Collection article 2017 ftdatacite https://doi.org/10.6084/m9.figshare.c.3963249.v1 https://doi.org/10.1186/s12983-017-0248-3 https://doi.org/10.6084/m9.figshare.c.3963249 2021-11-05T12:55:41Z Abstract Background Scavenger guilds are composed of a variety of species, co-existing in the same habitat and sharing the same niche in the food web. Niche partitioning among them can manifest in different feeding strategies, e.g. during carcass feeding. In the bentho-pelagic realm of the Southern Ocean, scavenging amphipods (Lysianassoidea) are ubiquitous and occupy a central role in decomposition processes. Here we address the question whether scavenging lysianassoid amphipods employ different feeding strategies during carcass feeding, and whether synergistic feeding activities may influence carcass decomposition. To this end, we compared the relatively large species Waldeckia obesa with the small species Cheirimedon femoratus, Hippomedon kergueleni, and Orchomenella rotundifrons during fish carcass feeding (Notothenia spp.). The experimental approach combined ex situ feeding experiments, behavioural observations, and scanning electron microscopic analyses of mandibles. Furthermore, we aimed to detect ecological drivers for distribution patterns of scavenging amphipods in the Antarctic coastal ecosystems of Potter Cove. In Potter Cove, the climate-driven rapid retreat of the Fourcade Glacier is causing various environmental changes including the provision of new marine habitats to colonise. While in the newly ice-free areas fish are rare, macroalgae have already colonised hard substrates. Assuming that a temporal dietary switch may increase the colonisation success of the most abundant lysianassoids C. femoratus and H. kergueleni, we aimed to determine their consumption rates (g food x g amphipods−1 x day−1) and preferences of macroalgae and fish. Results We detected two functional groups with different feeding strategies among scavenging amphipods during carcass feeding: carcass ‘opener’ and ‘squeezer’. Synergistic effects between these groups were not statistically verified under the conditions tested. C. femoratus switched its diet when fish was not available by consuming macroalgae (about 0.2 day−1) but preferred fish by feeding up to 80% of its own mass daily. Contrary, H. kergueleni rejected macroalgae entirely and consumed fish with a maximal rate of 0.8 day−1. Conclusion This study reveals functional groups in scavenging shallow-water amphipods and provides new information on coastal intraguild niche partitioning. We conclude that the dietary flexibility of C. femoratus is a potential ecological driver and central to its success in the colonisation of newly available ice-free Antarctic coastal habitats. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Fourcade ENVELOPE(-62.490,-62.490,-64.612,-64.612) Fourcade Glacier ENVELOPE(-58.666,-58.666,-62.216,-62.216) Potter Cove Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Physiology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified Inorganic Chemistry FOS Chemical sciences |
spellingShingle |
Physiology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified Inorganic Chemistry FOS Chemical sciences Seefeldt, Meike Campana, Gabriela Deregibus, Dolores Quartino, María Abele, Doris Tollrian, Ralph Held, Christoph Different feeding strategies in Antarctic scavenging amphipods and their implications for colonisation success in times of retreating glaciers |
topic_facet |
Physiology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified Inorganic Chemistry FOS Chemical sciences |
description |
Abstract Background Scavenger guilds are composed of a variety of species, co-existing in the same habitat and sharing the same niche in the food web. Niche partitioning among them can manifest in different feeding strategies, e.g. during carcass feeding. In the bentho-pelagic realm of the Southern Ocean, scavenging amphipods (Lysianassoidea) are ubiquitous and occupy a central role in decomposition processes. Here we address the question whether scavenging lysianassoid amphipods employ different feeding strategies during carcass feeding, and whether synergistic feeding activities may influence carcass decomposition. To this end, we compared the relatively large species Waldeckia obesa with the small species Cheirimedon femoratus, Hippomedon kergueleni, and Orchomenella rotundifrons during fish carcass feeding (Notothenia spp.). The experimental approach combined ex situ feeding experiments, behavioural observations, and scanning electron microscopic analyses of mandibles. Furthermore, we aimed to detect ecological drivers for distribution patterns of scavenging amphipods in the Antarctic coastal ecosystems of Potter Cove. In Potter Cove, the climate-driven rapid retreat of the Fourcade Glacier is causing various environmental changes including the provision of new marine habitats to colonise. While in the newly ice-free areas fish are rare, macroalgae have already colonised hard substrates. Assuming that a temporal dietary switch may increase the colonisation success of the most abundant lysianassoids C. femoratus and H. kergueleni, we aimed to determine their consumption rates (g food x g amphipods−1 x day−1) and preferences of macroalgae and fish. Results We detected two functional groups with different feeding strategies among scavenging amphipods during carcass feeding: carcass ‘opener’ and ‘squeezer’. Synergistic effects between these groups were not statistically verified under the conditions tested. C. femoratus switched its diet when fish was not available by consuming macroalgae (about 0.2 day−1) but preferred fish by feeding up to 80% of its own mass daily. Contrary, H. kergueleni rejected macroalgae entirely and consumed fish with a maximal rate of 0.8 day−1. Conclusion This study reveals functional groups in scavenging shallow-water amphipods and provides new information on coastal intraguild niche partitioning. We conclude that the dietary flexibility of C. femoratus is a potential ecological driver and central to its success in the colonisation of newly available ice-free Antarctic coastal habitats. |
format |
Article in Journal/Newspaper |
author |
Seefeldt, Meike Campana, Gabriela Deregibus, Dolores Quartino, María Abele, Doris Tollrian, Ralph Held, Christoph |
author_facet |
Seefeldt, Meike Campana, Gabriela Deregibus, Dolores Quartino, María Abele, Doris Tollrian, Ralph Held, Christoph |
author_sort |
Seefeldt, Meike |
title |
Different feeding strategies in Antarctic scavenging amphipods and their implications for colonisation success in times of retreating glaciers |
title_short |
Different feeding strategies in Antarctic scavenging amphipods and their implications for colonisation success in times of retreating glaciers |
title_full |
Different feeding strategies in Antarctic scavenging amphipods and their implications for colonisation success in times of retreating glaciers |
title_fullStr |
Different feeding strategies in Antarctic scavenging amphipods and their implications for colonisation success in times of retreating glaciers |
title_full_unstemmed |
Different feeding strategies in Antarctic scavenging amphipods and their implications for colonisation success in times of retreating glaciers |
title_sort |
different feeding strategies in antarctic scavenging amphipods and their implications for colonisation success in times of retreating glaciers |
publisher |
Figshare |
publishDate |
2017 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.3963249.v1 https://figshare.com/collections/Different_feeding_strategies_in_Antarctic_scavenging_amphipods_and_their_implications_for_colonisation_success_in_times_of_retreating_glaciers/3963249/1 |
long_lat |
ENVELOPE(-62.490,-62.490,-64.612,-64.612) ENVELOPE(-58.666,-58.666,-62.216,-62.216) |
geographic |
Antarctic Fourcade Fourcade Glacier Potter Cove Southern Ocean The Antarctic |
geographic_facet |
Antarctic Fourcade Fourcade Glacier Potter Cove Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
https://dx.doi.org/10.1186/s12983-017-0248-3 https://dx.doi.org/10.6084/m9.figshare.c.3963249 |
op_rights |
CC BY 4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.3963249.v1 https://doi.org/10.1186/s12983-017-0248-3 https://doi.org/10.6084/m9.figshare.c.3963249 |
_version_ |
1766037967607955456 |