Is silence golden? The recovery rationale for yielding—and enforcing—the maritime right-of-way to Southern Resident killer whales and their access to prey
Prey availability is recognized as one of three major limiting factors in the recovery of Southern Resident Killer Whales (SRKWs) by the US and Canada. In terms of inter-related, cumulative effects the most recent population viability analysis (Lacy et al. 2017) suggests that improving access to tho...
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ftwestwashington:oai:cedar.wwu.edu:ssec-2528 2023-05-15T17:03:41+02:00 Is silence golden? The recovery rationale for yielding—and enforcing—the maritime right-of-way to Southern Resident killer whales and their access to prey Hass, Todd 2018-04-04T23:00:00Z application/pdf https://cedar.wwu.edu/ssec/2018ssec/allsessions/93 https://cedar.wwu.edu/cgi/viewcontent.cgi?article=2528&context=ssec English eng Western CEDAR https://cedar.wwu.edu/ssec/2018ssec/allsessions/93 https://cedar.wwu.edu/cgi/viewcontent.cgi?article=2528&context=ssec This resource is displayed for educational purposes only and may be subject to U.S. and international copyright laws. For more information about rights or obtaining copies of this resource, please contact University Archives, Heritage Resources, Western Libraries, Western Washington University, Bellingham, WA 98225-9103, USA (360-650-7534; heritage.resources@wwu.edu) and refer to the collection name and identifier. Any materials cited must be attributed to the Salish Sea Ecosystem Conference Records, University Archives, Heritage Resources, Western Libraries, Western Washington University. Salish Sea Ecosystem Conference Killer whale disturbance enforcement Fresh Water Studies Life Sciences Marine Biology Natural Resources and Conservation Terrestrial and Aquatic Ecology text 2018 ftwestwashington 2022-09-14T06:02:54Z Prey availability is recognized as one of three major limiting factors in the recovery of Southern Resident Killer Whales (SRKWs) by the US and Canada. In terms of inter-related, cumulative effects the most recent population viability analysis (Lacy et al. 2017) suggests that improving access to those prey—by reducing (1) the masking effects of vessel noise on echolocation and intra-pod communication, and (2) the physical interference caused by nearby vessels on the water—could magnify the benefits of modest gains in the abundance of the residents’ primary prey, Chinook salmon. The transboundary SRKW Symposium in October 2017 highlighted emerging studies on underwater noise and potential opportunities for mitigation; also reflected in various sessions at this conference. Discussions there also revived regional recognition that—independent of the noise-masking effects of recreational fishing, whale-watching and other types of vessel activities—the physical presence of vessels may also disturb SRKWs. Using the behavior of Northern Resident Killer Whales as a proxy, Williams et al. (2011) found that even kayaks (essentially silent) evoked evasive, energetically expensive “outpace” responses and reduced foraging time. The effects of such disturbance appeared to worsen during periods of low Chinook salmon abundance. While Southern Residents appear to be more boat-tolerant than their northern counterparts, groups of 3-5+ boats still alter the whales’ behavior and reduce the proportion of time spent foraging and—by extension—consumption of prey (per Lusseau et al. 2009). This talk will summarize studies documenting this phenomenon in resident killer whales and other cetaceans. By more definitively documenting the potential pervasiveness and influence of boat presence alone, I seek to outline the benefits and tradeoffs of trying to reduce such potential interference by various precautionary methods: including enhanced regulatory enforcement and incentives for conservative approach-distances, speed limits, and the use of ... Text Killer Whale Killer whale Western Washington University: CEDAR (Contributing to Education through Digital Access to Research) Canada |
institution |
Open Polar |
collection |
Western Washington University: CEDAR (Contributing to Education through Digital Access to Research) |
op_collection_id |
ftwestwashington |
language |
English |
topic |
Killer whale disturbance enforcement Fresh Water Studies Life Sciences Marine Biology Natural Resources and Conservation Terrestrial and Aquatic Ecology |
spellingShingle |
Killer whale disturbance enforcement Fresh Water Studies Life Sciences Marine Biology Natural Resources and Conservation Terrestrial and Aquatic Ecology Hass, Todd Is silence golden? The recovery rationale for yielding—and enforcing—the maritime right-of-way to Southern Resident killer whales and their access to prey |
topic_facet |
Killer whale disturbance enforcement Fresh Water Studies Life Sciences Marine Biology Natural Resources and Conservation Terrestrial and Aquatic Ecology |
description |
Prey availability is recognized as one of three major limiting factors in the recovery of Southern Resident Killer Whales (SRKWs) by the US and Canada. In terms of inter-related, cumulative effects the most recent population viability analysis (Lacy et al. 2017) suggests that improving access to those prey—by reducing (1) the masking effects of vessel noise on echolocation and intra-pod communication, and (2) the physical interference caused by nearby vessels on the water—could magnify the benefits of modest gains in the abundance of the residents’ primary prey, Chinook salmon. The transboundary SRKW Symposium in October 2017 highlighted emerging studies on underwater noise and potential opportunities for mitigation; also reflected in various sessions at this conference. Discussions there also revived regional recognition that—independent of the noise-masking effects of recreational fishing, whale-watching and other types of vessel activities—the physical presence of vessels may also disturb SRKWs. Using the behavior of Northern Resident Killer Whales as a proxy, Williams et al. (2011) found that even kayaks (essentially silent) evoked evasive, energetically expensive “outpace” responses and reduced foraging time. The effects of such disturbance appeared to worsen during periods of low Chinook salmon abundance. While Southern Residents appear to be more boat-tolerant than their northern counterparts, groups of 3-5+ boats still alter the whales’ behavior and reduce the proportion of time spent foraging and—by extension—consumption of prey (per Lusseau et al. 2009). This talk will summarize studies documenting this phenomenon in resident killer whales and other cetaceans. By more definitively documenting the potential pervasiveness and influence of boat presence alone, I seek to outline the benefits and tradeoffs of trying to reduce such potential interference by various precautionary methods: including enhanced regulatory enforcement and incentives for conservative approach-distances, speed limits, and the use of ... |
format |
Text |
author |
Hass, Todd |
author_facet |
Hass, Todd |
author_sort |
Hass, Todd |
title |
Is silence golden? The recovery rationale for yielding—and enforcing—the maritime right-of-way to Southern Resident killer whales and their access to prey |
title_short |
Is silence golden? The recovery rationale for yielding—and enforcing—the maritime right-of-way to Southern Resident killer whales and their access to prey |
title_full |
Is silence golden? The recovery rationale for yielding—and enforcing—the maritime right-of-way to Southern Resident killer whales and their access to prey |
title_fullStr |
Is silence golden? The recovery rationale for yielding—and enforcing—the maritime right-of-way to Southern Resident killer whales and their access to prey |
title_full_unstemmed |
Is silence golden? The recovery rationale for yielding—and enforcing—the maritime right-of-way to Southern Resident killer whales and their access to prey |
title_sort |
is silence golden? the recovery rationale for yielding—and enforcing—the maritime right-of-way to southern resident killer whales and their access to prey |
publisher |
Western CEDAR |
publishDate |
2018 |
url |
https://cedar.wwu.edu/ssec/2018ssec/allsessions/93 https://cedar.wwu.edu/cgi/viewcontent.cgi?article=2528&context=ssec |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Killer Whale Killer whale |
genre_facet |
Killer Whale Killer whale |
op_source |
Salish Sea Ecosystem Conference |
op_relation |
https://cedar.wwu.edu/ssec/2018ssec/allsessions/93 https://cedar.wwu.edu/cgi/viewcontent.cgi?article=2528&context=ssec |
op_rights |
This resource is displayed for educational purposes only and may be subject to U.S. and international copyright laws. For more information about rights or obtaining copies of this resource, please contact University Archives, Heritage Resources, Western Libraries, Western Washington University, Bellingham, WA 98225-9103, USA (360-650-7534; heritage.resources@wwu.edu) and refer to the collection name and identifier. Any materials cited must be attributed to the Salish Sea Ecosystem Conference Records, University Archives, Heritage Resources, Western Libraries, Western Washington University. |
_version_ |
1766057596718940160 |