Linking animal-borne video to accelerometers reveals prey capture variability
Understanding foraging is important in ecology, as it determines the energy gains and, ultimately, the fitness of animals. However, monitoring prey captures of individual animals is difficult. Direct observations using animal-borne videos have short recording periods, and indirect signals (e.g., sto...
Published in: | Proceedings of the National Academy of Sciences |
---|---|
Main Authors: | , |
Format: | Text |
Language: | English |
Published: |
National Academy of Sciences
2013
|
Subjects: | |
Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3568313 http://www.ncbi.nlm.nih.gov/pubmed/23341596 https://doi.org/10.1073/pnas.1216244110 |
id |
ftpubmed:oai:pubmedcentral.nih.gov:3568313 |
---|---|
record_format |
openpolar |
spelling |
ftpubmed:oai:pubmedcentral.nih.gov:3568313 2023-05-15T18:18:37+02:00 Linking animal-borne video to accelerometers reveals prey capture variability Watanabe, Yuuki Y. Takahashi, Akinori 2013-02-05 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3568313 http://www.ncbi.nlm.nih.gov/pubmed/23341596 https://doi.org/10.1073/pnas.1216244110 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3568313 http://www.ncbi.nlm.nih.gov/pubmed/23341596 http://dx.doi.org/10.1073/pnas.1216244110 Biological Sciences Text 2013 ftpubmed https://doi.org/10.1073/pnas.1216244110 2013-09-04T19:38:24Z Understanding foraging is important in ecology, as it determines the energy gains and, ultimately, the fitness of animals. However, monitoring prey captures of individual animals is difficult. Direct observations using animal-borne videos have short recording periods, and indirect signals (e.g., stomach temperature) are never validated in the field. We took an integrated approach to monitor prey captures by a predator by deploying a video camera (lasting for 85 min) and two accelerometers (on the head and back, lasting for 50 h) on free-swimming Adélie penguins. The movies showed that penguins moved the heads rapidly to capture krill in midwater and fish (Pagothenia borchgrevinki) underneath the sea ice. Captures were remarkably fast (two krill per second in swarms) and efficient (244 krill or 33 P. borchgrevinki in 78–89 min). Prey captures were detected by the signal of head acceleration relative to body acceleration with high sensitivity and specificity (0.83–0.90), as shown by receiver-operating characteristic analysis. Extension of signal analysis to the entire behavioral records showed that krill captures were spatially and temporally more variable than P. borchgrevinki captures. Notably, the frequency distribution of krill capture rate closely followed a power-law model, indicating that the foraging success of penguins depends on a small number of very successful dives. The three steps illustrated here (i.e., video observations, linking video to behavioral signals, and extension of signal analysis) are unique approaches to understanding the spatial and temporal variability of ecologically important events such as foraging. Text Sea ice PubMed Central (PMC) Proceedings of the National Academy of Sciences 110 6 2199 2204 |
institution |
Open Polar |
collection |
PubMed Central (PMC) |
op_collection_id |
ftpubmed |
language |
English |
topic |
Biological Sciences |
spellingShingle |
Biological Sciences Watanabe, Yuuki Y. Takahashi, Akinori Linking animal-borne video to accelerometers reveals prey capture variability |
topic_facet |
Biological Sciences |
description |
Understanding foraging is important in ecology, as it determines the energy gains and, ultimately, the fitness of animals. However, monitoring prey captures of individual animals is difficult. Direct observations using animal-borne videos have short recording periods, and indirect signals (e.g., stomach temperature) are never validated in the field. We took an integrated approach to monitor prey captures by a predator by deploying a video camera (lasting for 85 min) and two accelerometers (on the head and back, lasting for 50 h) on free-swimming Adélie penguins. The movies showed that penguins moved the heads rapidly to capture krill in midwater and fish (Pagothenia borchgrevinki) underneath the sea ice. Captures were remarkably fast (two krill per second in swarms) and efficient (244 krill or 33 P. borchgrevinki in 78–89 min). Prey captures were detected by the signal of head acceleration relative to body acceleration with high sensitivity and specificity (0.83–0.90), as shown by receiver-operating characteristic analysis. Extension of signal analysis to the entire behavioral records showed that krill captures were spatially and temporally more variable than P. borchgrevinki captures. Notably, the frequency distribution of krill capture rate closely followed a power-law model, indicating that the foraging success of penguins depends on a small number of very successful dives. The three steps illustrated here (i.e., video observations, linking video to behavioral signals, and extension of signal analysis) are unique approaches to understanding the spatial and temporal variability of ecologically important events such as foraging. |
format |
Text |
author |
Watanabe, Yuuki Y. Takahashi, Akinori |
author_facet |
Watanabe, Yuuki Y. Takahashi, Akinori |
author_sort |
Watanabe, Yuuki Y. |
title |
Linking animal-borne video to accelerometers reveals prey capture variability |
title_short |
Linking animal-borne video to accelerometers reveals prey capture variability |
title_full |
Linking animal-borne video to accelerometers reveals prey capture variability |
title_fullStr |
Linking animal-borne video to accelerometers reveals prey capture variability |
title_full_unstemmed |
Linking animal-borne video to accelerometers reveals prey capture variability |
title_sort |
linking animal-borne video to accelerometers reveals prey capture variability |
publisher |
National Academy of Sciences |
publishDate |
2013 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3568313 http://www.ncbi.nlm.nih.gov/pubmed/23341596 https://doi.org/10.1073/pnas.1216244110 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3568313 http://www.ncbi.nlm.nih.gov/pubmed/23341596 http://dx.doi.org/10.1073/pnas.1216244110 |
op_doi |
https://doi.org/10.1073/pnas.1216244110 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
110 |
container_issue |
6 |
container_start_page |
2199 |
op_container_end_page |
2204 |
_version_ |
1766195253019148288 |