Harbour porpoise ( Phocoena phocoena) static acoustic monitoring: laboratory detection thresholds of T-PODs are reflected in field sensitivity
The T-POD (Timing POrpoise Detector) is a self-contained acoustic data logger used for detecting and monitoring the presence of echolocation clicks of small cetaceans. It has become a standard tool in environmental impact assessments and monitoring programmes. Yet, little is known about the variabil...
Published in: | Journal of the Marine Biological Association of the United Kingdom |
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Language: | English |
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2008
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Online Access: | http://dx.doi.org/10.1017/s0025315408000416 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315408000416 |
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crcambridgeupr:10.1017/s0025315408000416 2024-06-23T07:53:30+00:00 Harbour porpoise ( Phocoena phocoena) static acoustic monitoring: laboratory detection thresholds of T-PODs are reflected in field sensitivity Kyhn, Line A. Tougaard, Jakob Teilmann, Jonas Wahlberg, Magnus Jørgensen, Poul B. Bech, Nikolaj I. 2008 http://dx.doi.org/10.1017/s0025315408000416 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315408000416 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of the Marine Biological Association of the United Kingdom volume 88, issue 6, page 1085-1091 ISSN 0025-3154 1469-7769 journal-article 2008 crcambridgeupr https://doi.org/10.1017/s0025315408000416 2024-06-12T04:04:46Z The T-POD (Timing POrpoise Detector) is a self-contained acoustic data logger used for detecting and monitoring the presence of echolocation clicks of small cetaceans. It has become a standard tool in environmental impact assessments and monitoring programmes. Yet, little is known about the variability in sensitivity and detection range of T-PODs. In this study the field performance of ten v3 T-PODs was compared to detection thresholds measured in a tank. The T-POD thresholds ranged from 123 to 132 dB re 1μPa (pp). The detection thresholds of the ten individual T-PODs were different and the differences increased over time. The more sensitive a T-POD was in the laboratory (i.e. the lower the threshold) the more clicks were recorded by it in the field. Threshold correlated differently to the five analysed T-POD parameters (encounters, encounter duration, waiting time, porpoise positive minutes, clicks per porpoise positive minute). This study demonstrates that individual threshold calibrations of T-PODs are necessary to obtain comparable results when monitoring odontocetes with this tool. Regression equations for relationships between T-POD detection thresholds and study parameters obtained during field trials may allow comparisons of T-PODs with different detection thresholds. Article in Journal/Newspaper Harbour porpoise Phocoena phocoena Cambridge University Press Journal of the Marine Biological Association of the United Kingdom 88 6 1085 1091 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
The T-POD (Timing POrpoise Detector) is a self-contained acoustic data logger used for detecting and monitoring the presence of echolocation clicks of small cetaceans. It has become a standard tool in environmental impact assessments and monitoring programmes. Yet, little is known about the variability in sensitivity and detection range of T-PODs. In this study the field performance of ten v3 T-PODs was compared to detection thresholds measured in a tank. The T-POD thresholds ranged from 123 to 132 dB re 1μPa (pp). The detection thresholds of the ten individual T-PODs were different and the differences increased over time. The more sensitive a T-POD was in the laboratory (i.e. the lower the threshold) the more clicks were recorded by it in the field. Threshold correlated differently to the five analysed T-POD parameters (encounters, encounter duration, waiting time, porpoise positive minutes, clicks per porpoise positive minute). This study demonstrates that individual threshold calibrations of T-PODs are necessary to obtain comparable results when monitoring odontocetes with this tool. Regression equations for relationships between T-POD detection thresholds and study parameters obtained during field trials may allow comparisons of T-PODs with different detection thresholds. |
format |
Article in Journal/Newspaper |
author |
Kyhn, Line A. Tougaard, Jakob Teilmann, Jonas Wahlberg, Magnus Jørgensen, Poul B. Bech, Nikolaj I. |
spellingShingle |
Kyhn, Line A. Tougaard, Jakob Teilmann, Jonas Wahlberg, Magnus Jørgensen, Poul B. Bech, Nikolaj I. Harbour porpoise ( Phocoena phocoena) static acoustic monitoring: laboratory detection thresholds of T-PODs are reflected in field sensitivity |
author_facet |
Kyhn, Line A. Tougaard, Jakob Teilmann, Jonas Wahlberg, Magnus Jørgensen, Poul B. Bech, Nikolaj I. |
author_sort |
Kyhn, Line A. |
title |
Harbour porpoise ( Phocoena phocoena) static acoustic monitoring: laboratory detection thresholds of T-PODs are reflected in field sensitivity |
title_short |
Harbour porpoise ( Phocoena phocoena) static acoustic monitoring: laboratory detection thresholds of T-PODs are reflected in field sensitivity |
title_full |
Harbour porpoise ( Phocoena phocoena) static acoustic monitoring: laboratory detection thresholds of T-PODs are reflected in field sensitivity |
title_fullStr |
Harbour porpoise ( Phocoena phocoena) static acoustic monitoring: laboratory detection thresholds of T-PODs are reflected in field sensitivity |
title_full_unstemmed |
Harbour porpoise ( Phocoena phocoena) static acoustic monitoring: laboratory detection thresholds of T-PODs are reflected in field sensitivity |
title_sort |
harbour porpoise ( phocoena phocoena) static acoustic monitoring: laboratory detection thresholds of t-pods are reflected in field sensitivity |
publisher |
Cambridge University Press (CUP) |
publishDate |
2008 |
url |
http://dx.doi.org/10.1017/s0025315408000416 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315408000416 |
genre |
Harbour porpoise Phocoena phocoena |
genre_facet |
Harbour porpoise Phocoena phocoena |
op_source |
Journal of the Marine Biological Association of the United Kingdom volume 88, issue 6, page 1085-1091 ISSN 0025-3154 1469-7769 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0025315408000416 |
container_title |
Journal of the Marine Biological Association of the United Kingdom |
container_volume |
88 |
container_issue |
6 |
container_start_page |
1085 |
op_container_end_page |
1091 |
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1802645210025426944 |