Do man‐made structures and water depth affect the diel rhythms in click recordings of harbor porpoises ( Phocoena phocoena)?
Abstract The construction of industrial offshore structures may lead to colonization by a variety of marine organisms resulting in locally enhanced biodiversity and biomass, which may then affect the habitat use and behavior of marine predators. For harbor porpoises high nocturnal echolocation activ...
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crwiley:10.1111/mms.12112 2024-09-15T18:30:27+00:00 Do man‐made structures and water depth affect the diel rhythms in click recordings of harbor porpoises ( Phocoena phocoena)? Brandt, Miriam J. Hansen, Sophie Diederichs, Ansgar Nehls, Georg Femern Belt A/S 2014 http://dx.doi.org/10.1111/mms.12112 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmms.12112 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mms.12112 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 30, issue 3, page 1109-1121 ISSN 0824-0469 1748-7692 journal-article 2014 crwiley https://doi.org/10.1111/mms.12112 2024-08-09T04:21:04Z Abstract The construction of industrial offshore structures may lead to colonization by a variety of marine organisms resulting in locally enhanced biodiversity and biomass, which may then affect the habitat use and behavior of marine predators. For harbor porpoises high nocturnal echolocation activity was demonstrated near industrial structures and it was hypothesized that this was caused by increased feeding opportunities at night. Here we tested the hypothesis that bridge pillars will lead to more nocturnal echolocation activity by porpoises near them than at positions further away. The daily rhythms in porpoise detections near bridge pillars tended to be slightly more pronounced and a greater proportion of clicks occurred during the night. However, water depth had a greater impact on these rhythms, with more nocturnal porpoise echolocation activity and more pronounced daily rhythms in deeper waters. This may be related to different feeding techniques and prey choice by porpoises in deep and shallow water. In deeper water porpoises may be feeding pelagically on herring and cod, which show more activity and are easier to catch at night. In shallow water they may be targeting mainly gobies using a bottom feeding technique and this may not be more efficient at night. Article in Journal/Newspaper Phocoena phocoena Wiley Online Library Marine Mammal Science 30 3 1109 1121 |
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Abstract The construction of industrial offshore structures may lead to colonization by a variety of marine organisms resulting in locally enhanced biodiversity and biomass, which may then affect the habitat use and behavior of marine predators. For harbor porpoises high nocturnal echolocation activity was demonstrated near industrial structures and it was hypothesized that this was caused by increased feeding opportunities at night. Here we tested the hypothesis that bridge pillars will lead to more nocturnal echolocation activity by porpoises near them than at positions further away. The daily rhythms in porpoise detections near bridge pillars tended to be slightly more pronounced and a greater proportion of clicks occurred during the night. However, water depth had a greater impact on these rhythms, with more nocturnal porpoise echolocation activity and more pronounced daily rhythms in deeper waters. This may be related to different feeding techniques and prey choice by porpoises in deep and shallow water. In deeper water porpoises may be feeding pelagically on herring and cod, which show more activity and are easier to catch at night. In shallow water they may be targeting mainly gobies using a bottom feeding technique and this may not be more efficient at night. |
author2 |
Femern Belt A/S |
format |
Article in Journal/Newspaper |
author |
Brandt, Miriam J. Hansen, Sophie Diederichs, Ansgar Nehls, Georg |
spellingShingle |
Brandt, Miriam J. Hansen, Sophie Diederichs, Ansgar Nehls, Georg Do man‐made structures and water depth affect the diel rhythms in click recordings of harbor porpoises ( Phocoena phocoena)? |
author_facet |
Brandt, Miriam J. Hansen, Sophie Diederichs, Ansgar Nehls, Georg |
author_sort |
Brandt, Miriam J. |
title |
Do man‐made structures and water depth affect the diel rhythms in click recordings of harbor porpoises ( Phocoena phocoena)? |
title_short |
Do man‐made structures and water depth affect the diel rhythms in click recordings of harbor porpoises ( Phocoena phocoena)? |
title_full |
Do man‐made structures and water depth affect the diel rhythms in click recordings of harbor porpoises ( Phocoena phocoena)? |
title_fullStr |
Do man‐made structures and water depth affect the diel rhythms in click recordings of harbor porpoises ( Phocoena phocoena)? |
title_full_unstemmed |
Do man‐made structures and water depth affect the diel rhythms in click recordings of harbor porpoises ( Phocoena phocoena)? |
title_sort |
do man‐made structures and water depth affect the diel rhythms in click recordings of harbor porpoises ( phocoena phocoena)? |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.1111/mms.12112 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmms.12112 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mms.12112 |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_source |
Marine Mammal Science volume 30, issue 3, page 1109-1121 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/mms.12112 |
container_title |
Marine Mammal Science |
container_volume |
30 |
container_issue |
3 |
container_start_page |
1109 |
op_container_end_page |
1121 |
_version_ |
1810471908382081024 |