Author reports on a stranding of a female sperm whale in the Peruvian southern coast and review other similar events.
作者报道了一头雌性抹香鲸在秘鲁南部海岸搁浅的事件,并回顾了其他类似事件。
{"title":"Recent strandings of sperm whale, Physeter macrocephalus, in southern Peru","authors":"Jose Pizarro-Neyra","doi":"10.5597/00236","DOIUrl":"https://doi.org/10.5597/00236","url":null,"abstract":"Author reports on a stranding of a female sperm whale in the Peruvian southern coast and review other similar events.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"30 5 1","pages":"50-52"},"PeriodicalIF":0.0,"publicationDate":"2018-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83319835","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}
S. Landeo-Yauri, Nataly Castelblanco-Martínez, M. Williams
The Amazonian manatee ( Trichechus inunguis) is endangered due to illegal hunting. In Peru, the Centro de Rescate Amazonico (CREA) rehabilitates and releases rescued manatees. Tree females and two males were released in El Dorado Lake in July 2011 and radio tracked until November 2011. Movements, habitat use and behavior recorded during the post-release period were used to evaluate the manatees’ adaptation to free-living conditions. A total of 140 locations was registered during 91 days of tracking. Females showed greater residence time than males, which migrated out of the lake. Females selectively used the micro habitats of the study area, preferring floating vegetation, followed by open water and lastly shore macrophytes. Most idling behaviors were registered in areas with floating macrophytes, and open water was mainly used for traveling. No correlation between sighting hour and sighting location (micro habitat type) was detected. The use of suitable zones, in addition to natural behavior, suggests that these rescued manatees responded well to free-living conditions after release. Some considerations are provided with the purpose of strengthening manatee rehabilitation programs and improving future releases, emphasizing the importance of choosing appropriate individuals, as well as suitable areas and times to help improve release outcome.
{"title":"Behavior and habitat use of released rehabilitated Amazonian manatees in Peru","authors":"S. Landeo-Yauri, Nataly Castelblanco-Martínez, M. Williams","doi":"10.5597/00234","DOIUrl":"https://doi.org/10.5597/00234","url":null,"abstract":"The Amazonian manatee ( Trichechus inunguis) is endangered due to illegal hunting. In Peru, the Centro de Rescate Amazonico (CREA) rehabilitates and releases rescued manatees. Tree females and two males were released in El Dorado Lake in July 2011 and radio tracked until November 2011. Movements, habitat use and behavior recorded during the post-release period were used to evaluate the manatees’ adaptation to free-living conditions. A total of 140 locations was registered during 91 days of tracking. Females showed greater residence time than males, which migrated out of the lake. Females selectively used the micro habitats of the study area, preferring floating vegetation, followed by open water and lastly shore macrophytes. Most idling behaviors were registered in areas with floating macrophytes, and open water was mainly used for traveling. No correlation between sighting hour and sighting location (micro habitat type) was detected. The use of suitable zones, in addition to natural behavior, suggests that these rescued manatees responded well to free-living conditions after release. Some considerations are provided with the purpose of strengthening manatee rehabilitation programs and improving future releases, emphasizing the importance of choosing appropriate individuals, as well as suitable areas and times to help improve release outcome.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"1 1","pages":"17-27"},"PeriodicalIF":0.0,"publicationDate":"2018-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85213056","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}
E. Vermeulen, R. Bastida, Leonardo G. Berninsone, P. Bordino, M. Failla, P. Fruet, G. Harris, M. Iñíguez, M. Marchesi, P. Petracci, Laura M. Reyes, M. Sironi, S. Bräger
Although bottlenose dolphins Tursiops truncatus are among the most common delphinid species, global population trends remain poorly understood. To improve the knowledge of the species in the Southwest Atlantic Ocean, this paper reviews all available data related to the distribution and occurrence, abundance, residency and ranging patterns, group size and composition, survival and reproduction and population structure of the coastal bottlenose dolphin in Argentina. Most information proved to be scattered in time and space. Based on the available data, total abundance of coastal bottlenose dolphins in Argentina appears to be low. Data show sightings decreased notably since the 1990s in the northern province of Buenos Aires and the province of Chubut, with the species having disappeared completely from the former region. Data also indicated that two genetically and morphologically distinct coastal populations occur in Argentinean coastal waters, with a sympatric distribution in the provinces of Rio Negro and Chubut. One is an isolated ‘Evolutionary Signifcant Unit’ within the larger Southwest Atlantic, whereas the other population appears to be genetically related to the Southwest Atlantic offshore ecotype. In the absence of more substantial data, the present information is pertinent to our scientifc knowledge of the species in the country, collating all published information as well as information from grey literature and previously unpublished data. However, the available information appears to remain insufcient to explain the apparent decline in sightings and to assess the remaining abundance nationwide accurately. Therefore, we strongly recommend increased research efforts for an in-depth assessment of the species’ population status in Argentina.
{"title":"A review on the distribution, abundance, residency, survival and population structure of coastal bottlenose dolphins in Argentina","authors":"E. Vermeulen, R. Bastida, Leonardo G. Berninsone, P. Bordino, M. Failla, P. Fruet, G. Harris, M. Iñíguez, M. Marchesi, P. Petracci, Laura M. Reyes, M. Sironi, S. Bräger","doi":"10.5597/00233","DOIUrl":"https://doi.org/10.5597/00233","url":null,"abstract":"Although bottlenose dolphins Tursiops truncatus are among the most common delphinid species, global population trends remain poorly understood. To improve the knowledge of the species in the Southwest Atlantic Ocean, this paper reviews all available data related to the distribution and occurrence, abundance, residency and ranging patterns, group size and composition, survival and reproduction and population structure of the coastal bottlenose dolphin in Argentina. Most information proved to be scattered in time and space. Based on the available data, total abundance of coastal bottlenose dolphins in Argentina appears to be low. Data show sightings decreased notably since the 1990s in the northern province of Buenos Aires and the province of Chubut, with the species having disappeared completely from the former region. Data also indicated that two genetically and morphologically distinct coastal populations occur in Argentinean coastal waters, with a sympatric distribution in the provinces of Rio Negro and Chubut. One is an isolated ‘Evolutionary Signifcant Unit’ within the larger Southwest Atlantic, whereas the other population appears to be genetically related to the Southwest Atlantic offshore ecotype. In the absence of more substantial data, the present information is pertinent to our scientifc knowledge of the species in the country, collating all published information as well as information from grey literature and previously unpublished data. However, the available information appears to remain insufcient to explain the apparent decline in sightings and to assess the remaining abundance nationwide accurately. Therefore, we strongly recommend increased research efforts for an in-depth assessment of the species’ population status in Argentina.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"176 1","pages":"2-16"},"PeriodicalIF":0.0,"publicationDate":"2018-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77688059","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}
L. F. S. Mayorga, R. C. C. Bhering, R. Hurtado, R. Vanstreels
We report four years (2012-2015) of consecutive observations of the same juvenile male Southern elephant seal along the coast Espirito Santo (ES), Brazil, identified based on scars of cookiecutter shark bites. In 2015 three bacteries were isolated from a recent lesion using routine methods of bacterial culture and identification, and a large number of barnacles were seen attached to the fur of other body regions, especially on the pelvic limbs and lower back. We collected 12 barnacles from different body areas, and identified all of them as Eared barnacles ( Conchoderma aurita ). Additionally, a sample of feces was obtained and analyzed through simple-flotation, revealing helminth eggs compatible with Contracaecum sp.
{"title":"Recurrent sightings of a Southern elephant seal (Mirounga leonina) on the southeast coast of Brazil, 2012 – 2017","authors":"L. F. S. Mayorga, R. C. C. Bhering, R. Hurtado, R. Vanstreels","doi":"10.5597/00237","DOIUrl":"https://doi.org/10.5597/00237","url":null,"abstract":"We report four years (2012-2015) of consecutive observations of the same juvenile male Southern elephant seal along the coast Espirito Santo (ES), Brazil, identified based on scars of cookiecutter shark bites. In 2015 three bacteries were isolated from a recent lesion using routine methods of bacterial culture and identification, and a large number of barnacles were seen attached to the fur of other body regions, especially on the pelvic limbs and lower back. We collected 12 barnacles from different body areas, and identified all of them as Eared barnacles ( Conchoderma aurita ). Additionally, a sample of feces was obtained and analyzed through simple-flotation, revealing helminth eggs compatible with Contracaecum sp.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"56 1","pages":"53-58"},"PeriodicalIF":0.0,"publicationDate":"2018-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90945165","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}
J. E. O'Hern, Michelle Sculley, Kerri Jean-Smith, D. Biggs, N. Slowey, Daniela Alarcòn Ruales, R. Duncan
Five marine mammal surveys between 2008 and 2011 were conducted aboard the Buque de Investigacion Orion (the research vessel for the Oceanographic Institute of the Ecuadorian Navy) within oceanic waters adjacent to mainland Ecuador and the Galapagos Islands. The surveys dedicated extensive time in deep, offshore waters where cetaceans were not densely present. Sightings of 12 species were compared with an earlier survey aboard the B/I Orion in 2001 as well as with a subset of published data from three NOAA STAR ( Stenella Abundance Research) surveys between 1999 and 2003. Additionally, a small boat, near-shore survey, was conducted during June 2010 among and near the Galapagos Islands. Encounter rates ranged annually from 0.012 cetacean/km to 0.027 cetacean/km. The highest encounter rate aboard the B/I Orion took place during the April 2009 survey. In order to compare sighting rates between the B/I Orion and NOAA platforms, the average effective half-strip widths were used to determine encounter rates per area effectively searched. A zonation within the study region was observed between odontocete and balaenopterid cetaceans as well as between striped ( Stenella coeruleoalba ) and short-beaked common dolphins ( Delphinus delphis ). Several methodological aspects of surveys and geographical features that may influence encounter rates and subsequent abundance estimates are discussed. This study demonstrates that vessels of opportunity provide a valuable means of studying open-ocean and coastal distributions of marine mammals. Possible methodological improvements, such as the use of high-power binoculars, that could increase the absolute number of sightings, the efficiency of these opportunistic surveys, and improve the sighting rates of more evasive species are discussed.
2008年至2011年间,在厄瓜多尔大陆和加拉帕戈斯群岛附近的海域,在猎户号(厄瓜多尔海军海洋学研究所的研究船)上进行了五次海洋哺乳动物调查。这些调查花了大量的时间在深海和近海水域,那里的鲸目动物并不密集。对12个物种的观测与2001年在B/I猎户座上进行的早期调查进行了比较,并与1999年至2003年NOAA STAR (Stenella Abundance Research)三次调查公布的数据进行了比较。此外,2010年6月在加拉帕戈斯群岛及其附近进行了一项小船近岸调查。每年的碰见率从0.012头鲸/公里到0.027头鲸/公里不等。在2009年4月的调查中,猎户座B/I上的相遇率最高。为了比较B/I猎户座和NOAA平台之间的目击率,使用平均有效半带宽度来确定每个有效搜索区域的遭遇率。在研究区域内,在齿齿鲸类和balaenopterid鲸类之间以及条纹海豚(Stenella coeruleoalba)和短喙普通海豚(Delphinus delphis)之间观察到分区。调查的几个方法学方面和地理特征可能影响相遇率和随后的丰度估计进行了讨论。这项研究表明,机遇船为研究海洋哺乳动物在公海和沿海的分布提供了有价值的手段。可能的方法改进,如使用高倍双筒望远镜,可以增加目击的绝对数量,这些机会性调查的效率,并提高更多逃避物种的目击率进行了讨论。
{"title":"Marine mammal distribution in Ecuador: surveys aboard a ship of opportunity as a means of monitoring relative abundance","authors":"J. E. O'Hern, Michelle Sculley, Kerri Jean-Smith, D. Biggs, N. Slowey, Daniela Alarcòn Ruales, R. Duncan","doi":"10.5597/00235","DOIUrl":"https://doi.org/10.5597/00235","url":null,"abstract":"Five marine mammal surveys between 2008 and 2011 were conducted aboard the Buque de Investigacion Orion (the research vessel for the Oceanographic Institute of the Ecuadorian Navy) within oceanic waters adjacent to mainland Ecuador and the Galapagos Islands. The surveys dedicated extensive time in deep, offshore waters where cetaceans were not densely present. Sightings of 12 species were compared with an earlier survey aboard the B/I Orion in 2001 as well as with a subset of published data from three NOAA STAR ( Stenella Abundance Research) surveys between 1999 and 2003. Additionally, a small boat, near-shore survey, was conducted during June 2010 among and near the Galapagos Islands. Encounter rates ranged annually from 0.012 cetacean/km to 0.027 cetacean/km. The highest encounter rate aboard the B/I Orion took place during the April 2009 survey. In order to compare sighting rates between the B/I Orion and NOAA platforms, the average effective half-strip widths were used to determine encounter rates per area effectively searched. A zonation within the study region was observed between odontocete and balaenopterid cetaceans as well as between striped ( Stenella coeruleoalba ) and short-beaked common dolphins ( Delphinus delphis ). Several methodological aspects of surveys and geographical features that may influence encounter rates and subsequent abundance estimates are discussed. This study demonstrates that vessels of opportunity provide a valuable means of studying open-ocean and coastal distributions of marine mammals. Possible methodological improvements, such as the use of high-power binoculars, that could increase the absolute number of sightings, the efficiency of these opportunistic surveys, and improve the sighting rates of more evasive species are discussed.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"51 1","pages":"28-39"},"PeriodicalIF":0.0,"publicationDate":"2018-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89209834","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 reaction of a manatee mating herd to the presence of two SCUBA divers in Puerto Rico is presented.
海牛交配群对波多黎各两个水肺潜水员的存在的反应。
{"title":"Unusual aggressive behavior encountered by divers from Antillean manatees (Trichechus manatus manatus) in Puerto Rico","authors":"Chelsea A. Harms-Tuohy, E. Tuohy","doi":"10.5597/00238","DOIUrl":"https://doi.org/10.5597/00238","url":null,"abstract":"The reaction of a manatee mating herd to the presence of two SCUBA divers in Puerto Rico is presented.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"16 1","pages":"59-60"},"PeriodicalIF":0.0,"publicationDate":"2018-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78505275","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}
This study provides information on seasonal distribution patterns for river dolphins in Bolivia.
本研究提供了玻利维亚河豚季节性分布模式的信息。
{"title":"Encounter rates of the Bolivian river dolphin (Inia boliviensis) in northeastern Bolivia","authors":"Enzo Aliaga Rossel, Luis Guizada","doi":"10.5597/00240","DOIUrl":"https://doi.org/10.5597/00240","url":null,"abstract":"This study provides information on seasonal distribution patterns for river dolphins in Bolivia.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"50 1","pages":"45-49"},"PeriodicalIF":0.0,"publicationDate":"2018-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77611337","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}
Camila Carvalho Carvalho, D. M. Gräbin, M. Marmontel
We report what is believed to be the first description of a mating herd among Amazonian manatees
我们报告了被认为是亚马逊海牛交配群的第一个描述
{"title":"Observation of a potential mating herd in Amazonian manatee","authors":"Camila Carvalho Carvalho, D. M. Gräbin, M. Marmontel","doi":"10.5597/00239","DOIUrl":"https://doi.org/10.5597/00239","url":null,"abstract":"We report what is believed to be the first description of a mating herd among Amazonian manatees","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"52 1","pages":"40-44"},"PeriodicalIF":0.0,"publicationDate":"2018-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74186822","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}
P. Fruet, C. Zappes, T. Bisi, P. C. Simões‐Lopes, P. Laporta, J. Loureiro, P. Flores
In this work we compiled the available information about humans and bottlenose dolphin interactions in the Southwest Atlantic Ocean (SWAO), including issues as historical direct takes, incidental captures in fisheries, positive interactions with fisheries, interactions of dolphins with tourism and boat traffic, habitat modification or degradation, and environmental pollution. The data compiled in this review demonstrated that coastal bottlenose dolphins are under anthropogenic pressure in the SWAO. Direct take of bottlenose dolphins in the wild does not appear to be an issue of conservation concern in the SWAO. Although the species is exposed to bioaccumulation of micropollutants, it is suggested that contamination level is lower when compared to bottlenose dolphins from other continents. Coastal works can impact bottlenose dolphin behavior and habitat use in a short-term, but those seem to be reversible when works stop. Bycatch occurs throughout the species distribution and seems to be occasional in Uruguayan and Argentinean waters, where there is evidence of a historic decline in dolphin sightings. In Brazil, bycatch is apparently low in the northeast and southeast coasts, but is frequent in certain areas of southern Brazil. Studies on the subject are scarce or preliminary and a great effort is still required to understand the real impact of human activities on bottlenose dolphins in the SWAO.
{"title":"Report of the Working Group on Interactions between Humans and Tursiops truncatus in the Southwest Atlantic Ocean","authors":"P. Fruet, C. Zappes, T. Bisi, P. C. Simões‐Lopes, P. Laporta, J. Loureiro, P. Flores","doi":"10.5597/LAJAM00218","DOIUrl":"https://doi.org/10.5597/LAJAM00218","url":null,"abstract":"In this work we compiled the available information about humans and bottlenose dolphin interactions in the Southwest Atlantic Ocean (SWAO), including issues as historical direct takes, incidental captures in fisheries, positive interactions with fisheries, interactions of dolphins with tourism and boat traffic, habitat modification or degradation, and environmental pollution. The data compiled in this review demonstrated that coastal bottlenose dolphins are under anthropogenic pressure in the SWAO. Direct take of bottlenose dolphins in the wild does not appear to be an issue of conservation concern in the SWAO. Although the species is exposed to bioaccumulation of micropollutants, it is suggested that contamination level is lower when compared to bottlenose dolphins from other continents. Coastal works can impact bottlenose dolphin behavior and habitat use in a short-term, but those seem to be reversible when works stop. Bycatch occurs throughout the species distribution and seems to be occasional in Uruguayan and Argentinean waters, where there is evidence of a historic decline in dolphin sightings. In Brazil, bycatch is apparently low in the northeast and southeast coasts, but is frequent in certain areas of southern Brazil. Studies on the subject are scarce or preliminary and a great effort is still required to understand the real impact of human activities on bottlenose dolphins in the SWAO.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"11 1","pages":"79-98"},"PeriodicalIF":0.0,"publicationDate":"2017-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74595116","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}
A. Meirelles, T. M. Campos, Milton C. C. Marcondes, K. Groch, L. R. A. Souto, Maria do Socorro Santos dos Reis, I. Normande, F. Luna, Lídio França do Nascimento, F. Silva, J. E. Vergara‐Parente, J. Borges, A. Jesus, F. Attademo, J. M. Silva
This study revises and updates information on bottlenose dolphin Tursiops truncatusstrandings and sightings in northeastern Brazil. A total of 72 strandings were recorded from 1992 to 2010, and 51 sightings were recorded from 1988 to 2010 along the states from Ceara to Bahia, including Fernando de Noronha and Sao Pedro and Sao Paulo archipelagos, Rocas Atoll and Abrolhos Bank. Most strandings were recorded in the states of Pernambuco, Bahia and Rio Grande do Norte. The number of reports was higher during summer, but no statistically significant difference was found between summer and other seasons. The majority of the stranded animals were adults (70.6%). Stranded calves were not observed. Total body length ranged from 138 to 321cm: 138 to 310cm for males; and 168 to 288cm for females. The average adult body length was 281cm (SD = 0.22). For stranding events where sex was determined (n = 29), a highly statistically significant difference was found between the number of males (n = 21) and females (n = 8). A total of six animals (8.3%) showed evidence of fisheries interactions such as net marks or removal of meat, blubber and eyes. Twenty-two sightings were recorded in the northeastern region, mostly in small islands and Rocas Atoll. This finding shows that the bottlenose dolphin is mainly an oceanic species in the region. More efforts are needed to improve our understanding of the populations and conservation status of bottlenose dolphins in this region.
{"title":"Reports of strandings and sightings of bottlenose dolphins (Tursiops truncatus) in northeastern Brazil and Brazilian oceanic islands","authors":"A. Meirelles, T. M. Campos, Milton C. C. Marcondes, K. Groch, L. R. A. Souto, Maria do Socorro Santos dos Reis, I. Normande, F. Luna, Lídio França do Nascimento, F. Silva, J. E. Vergara‐Parente, J. Borges, A. Jesus, F. Attademo, J. M. Silva","doi":"10.5597/00227","DOIUrl":"https://doi.org/10.5597/00227","url":null,"abstract":"This study revises and updates information on bottlenose dolphin Tursiops truncatusstrandings and sightings in northeastern Brazil. A total of 72 strandings were recorded from 1992 to 2010, and 51 sightings were recorded from 1988 to 2010 along the states from Ceara to Bahia, including Fernando de Noronha and Sao Pedro and Sao Paulo archipelagos, Rocas Atoll and Abrolhos Bank. Most strandings were recorded in the states of Pernambuco, Bahia and Rio Grande do Norte. The number of reports was higher during summer, but no statistically significant difference was found between summer and other seasons. The majority of the stranded animals were adults (70.6%). Stranded calves were not observed. Total body length ranged from 138 to 321cm: 138 to 310cm for males; and 168 to 288cm for females. The average adult body length was 281cm (SD = 0.22). For stranding events where sex was determined (n = 29), a highly statistically significant difference was found between the number of males (n = 21) and females (n = 8). A total of six animals (8.3%) showed evidence of fisheries interactions such as net marks or removal of meat, blubber and eyes. Twenty-two sightings were recorded in the northeastern region, mostly in small islands and Rocas Atoll. This finding shows that the bottlenose dolphin is mainly an oceanic species in the region. More efforts are needed to improve our understanding of the populations and conservation status of bottlenose dolphins in this region.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"9 1","pages":"178-190"},"PeriodicalIF":0.0,"publicationDate":"2017-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90243270","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}