Neil Angelo S. Abreo, Darrell D. Blatchley, Kirsten F. Thompson
Strandings provide opportunities to collect data on interactions between megafauna and marine litter which help address the limited information available on the impacts of litter in developing countries, such as the Philippines. However, the perception that single‐individual strandings yield minimal data restricts the scope of publication, resulting in the limited dissemination of potentially valuable information. Here we present a case of plastic ingestion by a Bryde’s whale in the Philippines and discuss the importance of consistent long‐term collection of strandings data and the value of publishing these results.
{"title":"Short Communication: Marine litter ingestion by a Bryde’s whale (Balaenoptera edeni) in Mindanao, Philippines, and the need for consistent long-term recording of single-individual strandings","authors":"Neil Angelo S. Abreo, Darrell D. Blatchley, Kirsten F. Thompson","doi":"10.47536/jcrm.v24i1.403","DOIUrl":"https://doi.org/10.47536/jcrm.v24i1.403","url":null,"abstract":"Strandings provide opportunities to collect data on interactions between megafauna and marine litter which help address the limited information available on the impacts of litter in developing countries, such as the Philippines. However, the perception that single‐individual strandings yield minimal data restricts the scope of publication, resulting in the limited dissemination of potentially valuable information. Here we present a case of plastic ingestion by a Bryde’s whale in the Philippines and discuss the importance of consistent long‐term collection of strandings data and the value of publishing these results.","PeriodicalId":39929,"journal":{"name":"Journal of Cetacean Research and Management","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135538592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cathy E. Bacon, Katharine A. Hart, Ted Cheeseman, Lee Munson, Marianne H. Rasmussen, Valerie Chosson, Charla J. Basran
In the North Atlantic, some humpback whales (Megaptera novaeangliae) from the Icelandic feeding grounds are known to migrate to the breeding grounds in the West Indies. The Turks and Caicos Islands (TCI) are historically considered part of the larger breeding range; however, very little humpback whale data has been reported for TCI and there have been no previously confirmed matches or round‐trip migrations to the Icelandic feeding grounds. Here, we present the first documented photo‐identification match and round‐trip migration of a humpback whale between Iceland and the TCI.
{"title":"Short Communication: First-documented humpback whale (Megaptera novaeangliae) photo-identification match and round-trip migration between Iceland and the Turks and Caicos Islands","authors":"Cathy E. Bacon, Katharine A. Hart, Ted Cheeseman, Lee Munson, Marianne H. Rasmussen, Valerie Chosson, Charla J. Basran","doi":"10.47536/jcrm.v24i1.405","DOIUrl":"https://doi.org/10.47536/jcrm.v24i1.405","url":null,"abstract":"In the North Atlantic, some humpback whales (Megaptera novaeangliae) from the Icelandic feeding grounds are known to migrate to the breeding grounds in the West Indies. The Turks and Caicos Islands (TCI) are historically considered part of the larger breeding range; however, very little humpback whale data has been reported for TCI and there have been no previously confirmed matches or round‐trip migrations to the Icelandic feeding grounds. Here, we present the first documented photo‐identification match and round‐trip migration of a humpback whale between Iceland and the TCI.","PeriodicalId":39929,"journal":{"name":"Journal of Cetacean Research and Management","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135539169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Ganges river dolphin (Platanista gangetica) is an endangered freshwater species found in the rivers of India, Nepal and Bangladesh. The development of dams and barrages have severely affected this habitat as dolphins move into irrigation canals where they are at risk of injury or death due to a range of factors, such as rapidly receding waters, heat stroke, drowning and human interference. Between 2013–20, the TSA Foundation India and the Environment, Forest and Climate Change Department, Uttar Pradesh, rescued 24 dolphins in 18 entrapment events. While 19 dolphins were rescued, five died during capture or transportation. Here we describe our capture and transportation methods to raise awareness of the issue and improve survival rates in future entrapment events.
{"title":"Rescuing Ganges river dolphins (Platanista gangetica) from irrigation canals in Uttar Pradesh, North India, 2013-2020","authors":"Shailendra Singh, Arunima Singh, Sreeparna Dutta, Sanjay Srivastava","doi":"10.47536/jcrm.v24i1.349","DOIUrl":"https://doi.org/10.47536/jcrm.v24i1.349","url":null,"abstract":"The Ganges river dolphin (Platanista gangetica) is an endangered freshwater species found in the rivers of India, Nepal and Bangladesh. The development of dams and barrages have severely affected this habitat as dolphins move into irrigation canals where they are at risk of injury or death due to a range of factors, such as rapidly receding waters, heat stroke, drowning and human interference. Between 2013–20, the TSA Foundation India and the Environment, Forest and Climate Change Department, Uttar Pradesh, rescued 24 dolphins in 18 entrapment events. While 19 dolphins were rescued, five died during capture or transportation. Here we describe our capture and transportation methods to raise awareness of the issue and improve survival rates in future entrapment events.","PeriodicalId":39929,"journal":{"name":"Journal of Cetacean Research and Management","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135536073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Strait of Gibraltar is an important habitat for seven regularly occurring cetacean species. These waters are heavily used for fishing and therefore experience extraordinary levels of shipping traffic. Photography provides a valuable and non‐invasive tool to monitor the health of cetacean populations, where external injuries may indicate specific anthropogenic impacts, such as vessel strikes or fishery interactions. We manually screened 27,866 photos taken during whale‐watching operations between 2016–20 for human‐induced injuries. Injuries of potential anthropogenic origin were detected in 228 cases. The severity of these injuries ranged from superficial linear marks to severe traumas that may affect survival and fitness. Severe injuries included a gunshot wound, vessel‐related traumata and abrasions, signs of previous severe entanglements and deep lacerations which could stem from recreational fishery activities or propellor cuts and occasionally served as an entry point for dermal infections. In 2007, Spanish legislation introduced regulations on how to approach cetaceans by boat, but recreational fishery vessels have been commonly observed to disregard this law. We therefore urge stricter control and enforcement of existing laws and collaboration between the Spanish and Moroccan authorities to mitigate the human impact on cetaceans in this region. KEYWORDS: CETACEANS, STRAIT OF GIBRALTAR, HUMAN IMPACT, WOUNDS, LACERATIONS, ENTANGLEMENTS
{"title":"Injuries in cetaceans in the Strait of Gibraltar: an update for the period 2016-2020","authors":"Eva-Maria Franziska Hanninger, Jörn Selling, Katharina Heyer, Patricia Burkhardt-Holm","doi":"10.47536/jcrm.v24i1.397","DOIUrl":"https://doi.org/10.47536/jcrm.v24i1.397","url":null,"abstract":"The Strait of Gibraltar is an important habitat for seven regularly occurring cetacean species. These waters are heavily used for fishing and therefore experience extraordinary levels of shipping traffic. Photography provides a valuable and non‐invasive tool to monitor the health of cetacean populations, where external injuries may indicate specific anthropogenic impacts, such as vessel strikes or fishery interactions. We manually screened 27,866 photos taken during whale‐watching operations between 2016–20 for human‐induced injuries. Injuries of potential anthropogenic origin were detected in 228 cases. The severity of these injuries ranged from superficial linear marks to severe traumas that may affect survival and fitness. Severe injuries included a gunshot wound, vessel‐related traumata and abrasions, signs of previous severe entanglements and deep lacerations which could stem from recreational fishery activities or propellor cuts and occasionally served as an entry point for dermal infections. In 2007, Spanish legislation introduced regulations on how to approach cetaceans by boat, but recreational fishery vessels have been commonly observed to disregard this law. We therefore urge stricter control and enforcement of existing laws and collaboration between the Spanish and Moroccan authorities to mitigate the human impact on cetaceans in this region. KEYWORDS: CETACEANS, STRAIT OF GIBRALTAR, HUMAN IMPACT, WOUNDS, LACERATIONS, ENTANGLEMENTS","PeriodicalId":39929,"journal":{"name":"Journal of Cetacean Research and Management","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135817069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chandro Salgado Kent, Curt Jenner, Micheline Jenner, Philippe Bouchet, Eric Rexstad
Estimates of the abundance of Breeding Stock D humpback whales (Megaptera novaeangliae) are key to the conservation and management of what is thought to be one of the largest populations of the species. Five years (2000, 2001, 2006, 2007 and 2008) of aerial surveys carried out over an eight-year period at North West Cape (Western Australia) using line transect methodology allowed trends in whale numbers to be investigated, and provided a base for comparison with estimates made approximately 400km south at Shark Bay (Western Australia). A total of 3,127 whale detections were made during 74 surveys of the 7,043km2 study area west of NWC. Pod abundance for each flight was computed using a HorvitzThompson like estimator and converted to an absolute measure of abundance after corrections were made for estimated mean cluster size, unsurveyed time, swimming speed and animal availability. Resulting estimates from the migration model of best fit with the most credible assumptions were 7,276 (CI = 4,993–10,167) for 2000, 12,280 (CI = 6,830–49,434) for 2001, 18,692 (CI = 12,980–24,477) for 2006, 20,044 (CI = 13,815–31,646) for 2007, and 26,100 (CI = 20,152–33,272) for 2008. Based on these data, the trend model with the greatest r2 was exponential with an annual increase rate of 13% (CI = 5.6%–18.1%). While this value is above the species’ estimated maximum plausible growth rate of 11.8%, it is reasonably close to previous reports of between 10–12%. The coefficient of variation, however, was too large for a reliable trend estimate. Perception bias was also not accounted for in these calculations. Based on a crude appraisal which yielded an estimated p(0) of 0.783 (from independent observer effort, CV = 0.973), the 2008 humpback population size may be as large as 33,300. In conclusion, the work here provides evidence of an increasing Breeding Stock D population, but further surveys are necessary to confirm whether the population is indeed increasing at its maximum rate.
{"title":"Southern Hemisphere Breeding Stock D humpback whale population estimates from North West Cape, Western Australia","authors":"Chandro Salgado Kent, Curt Jenner, Micheline Jenner, Philippe Bouchet, Eric Rexstad","doi":"10.47536/jcrm.v12i1.588","DOIUrl":"https://doi.org/10.47536/jcrm.v12i1.588","url":null,"abstract":"Estimates of the abundance of Breeding Stock D humpback whales (Megaptera novaeangliae) are key to the conservation and management of what is thought to be one of the largest populations of the species. Five years (2000, 2001, 2006, 2007 and 2008) of aerial surveys carried out over an eight-year period at North West Cape (Western Australia) using line transect methodology allowed trends in whale numbers to be investigated, and provided a base for comparison with estimates made approximately 400km south at Shark Bay (Western Australia). A total of 3,127 whale detections were made during 74 surveys of the 7,043km2 study area west of NWC. Pod abundance for each flight was computed using a HorvitzThompson like estimator and converted to an absolute measure of abundance after corrections were made for estimated mean cluster size, unsurveyed time, swimming speed and animal availability. Resulting estimates from the migration model of best fit with the most credible assumptions were 7,276 (CI = 4,993–10,167) for 2000, 12,280 (CI = 6,830–49,434) for 2001, 18,692 (CI = 12,980–24,477) for 2006, 20,044 (CI = 13,815–31,646) for 2007, and 26,100 (CI = 20,152–33,272) for 2008. Based on these data, the trend model with the greatest r2 was exponential with an annual increase rate of 13% (CI = 5.6%–18.1%). While this value is above the species’ estimated maximum plausible growth rate of 11.8%, it is reasonably close to previous reports of between 10–12%. The coefficient of variation, however, was too large for a reliable trend estimate. Perception bias was also not accounted for in these calculations. Based on a crude appraisal which yielded an estimated p(0) of 0.783 (from independent observer effort, CV = 0.973), the 2008 humpback population size may be as large as 33,300. In conclusion, the work here provides evidence of an increasing Breeding Stock D population, but further surveys are necessary to confirm whether the population is indeed increasing at its maximum rate.","PeriodicalId":39929,"journal":{"name":"Journal of Cetacean Research and Management","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136131616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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