Latin American Journal of Aquatic Mammals最新文献

{"title":"Occurrence of bottlenose dolphins (Tursiops truncatus) in the Río Negro Estuary, Argentina, and their mid-distance movements along the Northeast Patagonian coast","authors":"M. Failla, Verónica A. Seijas, E. Vermeulen","doi":"10.5597/00226","DOIUrl":"https://doi.org/10.5597/00226","url":null,"abstract":"A systematic study was carried out on bottlenose dolphins (Tursiops truncatus) in the Rio Negro Estuary (RNE), Patagonia, Argentina, to analyze their occurrence and activity patterns in this region. The photo-identification data of this study was further compared to data from an adjacent region to gain information on the animals' movements along the northeastern Patagonian coast. Information was gathered through land-based observations between the months of March and July of 2008 up to 2011. Data on dolphin activity patterns were collected via an ad libitum focal-group sampling mode. At the same time, dorsal fin images were obtained from as many dolphins as possible for identification and subsequent re-identification of individuals. Total effort equaled 188h, resulting in 58h of observation of 124 dolphin groups [sightings per unit effort (SPUE) = 0.66 group/h]. Most of the groups observed contained between one and five individuals, and two main activity states could be determined, namely traveling (65%) and foraging (26%). The photo-identification effort, which started opportunistically in 2006, resulted in a catalogue of 17 individual dolphins, with a total mean re-identification rate of nine days (max. = 24 days). When comparing these pictures to the existing catalogue of Bahia San Antonio (BSA; approximately 200km west from the study area) dorsal fins of 15 individuals could be matched and most (n = 12) could be subsequently re-identified in both areas, indicating their long distance movements along the northeastern Patagonian coast during the austral autumn months. This season coincides with the lowest dolphin abundance and feeding activity in BSA. This study indicates that bottlenose dolphins enter the RNE to forage at least during autumn. It further suggests that the search for food resources is the main trigger for their movement patterns along the northeastern Patagonian coast during this season, at least for certain individuals. More research is needed to accurately confirm these hypotheses.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"15 1","pages":"170-177"},"PeriodicalIF":0.0,"publicationDate":"2017-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86376185","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}

{"title":"Long-term site fidelity and residency patterns of bottlenose dolphins (Tursiops truncatus) in the Tramandaí Estuary, southern Brazil","authors":"A. Giacomo, P. H. Ott","doi":"10.5597/00224","DOIUrl":"https://doi.org/10.5597/00224","url":null,"abstract":"The occurrence of common bottlenose dolphins (Tursiops truncatus) in Tramandai Estuary, southern Brazil, is described based on a photo-identification study conducted between January 2009 and February 2010. A total of 128 survey days were conducted with an average observation effort of 2.6 hours per day (SD = 0.6). Approximately 2050 photographs were taken from a shore land location at the mouth of the estuary. A total of nine dolphins were identified, including three calves. The dolphins were observed during all seasons, with a greater frequency during fall (79.3% of the days) and winter (60.7% of the days). The summer presented the lowest occurrence (2.4% of the days) of dolphins. During the entire study period, the maximum number of individuals sighted in any given day ranged from one to seven (average = 2.8 dolphins; SD = 1.35; n = 51). The residence indices, based on the resighting frequency of dolphins during the study period, ranged from 0.02 to 0.24 (average = 0.13; SD = 0.08; n = 9). However, most of the animals (67%) were resighted in over five months during a year and could be classified as residents. Longterm site fidelity was detected by resightings of four dolphins for over 18 years. These data combined reinforce the importance of the Tramandai Estuary for the common bottlenose dolphins in the region and highlight the need for local conservation efforts to guarantee the long-term persistence of these coastal populations.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"63 7 1","pages":"155-161"},"PeriodicalIF":0.0,"publicationDate":"2017-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91091124","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}

{"title":"Report of the Working Group on Ethnobiology and Environmental Education related to Tursiops truncatus in the Southwest Atlantic Ocean","authors":"C. Zappes, L. S. Hoffmann, S. Morón, P. Fruet, P. Laporta","doi":"10.5597/LAJAM00219","DOIUrl":"https://doi.org/10.5597/LAJAM00219","url":null,"abstract":"Ethnobiological studies and educational projects related to bottlenose dolphins ( Tursiops truncatus , Montagu, 1821) are still incipient in the Southwest Atlantic Ocean (SWAO). We review studies conducted in the region, especially Brazil, where more information is available. Proposals to implement studies related to ethnobiology and environmental education in relation to the species are also presented.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"34 1","pages":"99-105"},"PeriodicalIF":0.0,"publicationDate":"2017-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78957408","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}

{"title":"Report of the Working Group on the Biology and Ecology of Tursiops truncatus in the Southwest Atlantic Ocean","authors":"P. Laporta, P. Fruet, S. Siciliano, P. Flores, J. Loureiro","doi":"10.5597/00216","DOIUrl":"https://doi.org/10.5597/00216","url":null,"abstract":"We review information on the biology and ecology of common bottlenose dolphin (Tursiops truncatus) in the Southwest Atlantic Ocean (SWAO) with emphasis on growth, feeding ecology, epizootics and parasites, predation and pathologies.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"107 1","pages":"62-70"},"PeriodicalIF":0.0,"publicationDate":"2017-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75364282","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}

{"title":"Report of the Working Group on the Distribution of Tursiops truncatus in the Southwest Atlantic Ocean","authors":"L. Lodi, C. Domit, P. Laporta, J. C. Tullio, Cristiane C. A. Martins, E. Vermeulen","doi":"10.5597/LAJAM00214","DOIUrl":"https://doi.org/10.5597/LAJAM00214","url":null,"abstract":"The study reviews the information available on the distribution patterns of bottlenose dolphins within the SWAO (04 o N-56 o S, 25 o W-67 o W) including the northern portion of Brazil, covering the period from 1894 to 2011.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"14 1","pages":"29-46"},"PeriodicalIF":0.0,"publicationDate":"2017-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86470655","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}

{"title":"Variations and anomalies in the vertebral column of the bottlenose dolphin (Tursiops truncatus) from southern Brazil","authors":"A. P. Costa, C. Loch, P. C. Simões‐Lopes","doi":"10.5597/LAJAM00230","DOIUrl":"https://doi.org/10.5597/LAJAM00230","url":null,"abstract":"This paper describes cases of morphological variation and bone anomalies in the axial skeleton of the bottlenose dolphin, with emphasis on the vertebral column and considering the physical maturity of those specimens.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"21 1","pages":"212-219"},"PeriodicalIF":0.0,"publicationDate":"2017-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82416858","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}

{"title":"First estimate of common bottlenose dolphin (Tursiops truncatus) (Cetacea, Delphinidae) abundance off Uruguayan Atlantic coast","authors":"P. Laporta, P. Fruet, E. Secchi","doi":"10.5597/00223","DOIUrl":"https://doi.org/10.5597/00223","url":null,"abstract":"The common bottlenose dolphin Tursiops truncatus is often observed throughout the oceanic coast of Uruguay. Historically, its distribution was wider, including the estuary of the Rio de la Plata, but currently its occurrence seems to be restricted mainly to the Uruguayan Atlantic coast (Rocha Department). Conflicting interests and tradeoffs between conservation and development are being generated in Uruguay. On one hand, the establishment of protected areas, responsible tourism and sustainable fisheries are promoted, while on the other hand, foreign exploitation of natural resources and development of mega-infrastructure in coastal zone are facilitated. In this work, we provide the first estimate of bottlenose dolphin’s abundance along the Uruguayan Atlantic coast. These results can be used as baseline information for monitoring population trends and guiding conservation actions for bottlenose dolphins in Uruguay. Mark-recapture models were applied to data of photoidentified animals with long-lasting natural marks. Total population size estimates of 63 individuals (95% CI = 54–74) and 61 (95% CI = 53–73) were obtained from closed and open population models, respectively. Although the estimates are within the range of values obtained for other coastal bottlenose dolphin populations in the Southwest Atlantic Ocean, as well as other regions of the world, it is lower than the values reported for populations inhabiting open habitats. This small population is probably vulnerable to non-natural removals, environmental and demographic stochasticity. Therefore, precautionary actions are recommended given the planned development for this coastal region.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"19 1","pages":"144-154"},"PeriodicalIF":0.0,"publicationDate":"2017-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88994724","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}

{"title":"Report of the Working Group on Taxonomy and Stock Identity of bottlenose dolphins in the Southwest Atlantic Ocean","authors":"P. H. Ott, A. Barreto, S. Siciliano, P. Laporta, C. Domit, P. Fruet, L. D. Rosa, M. C. Santos, A. Meirelles, M. Marchesi, S. Botta, L. Oliveira, I. Moreno, J. C. Wickert, E. Vermeulen, L. S. Hoffmann, C. Baracho, Paulo César Simões Lopes","doi":"10.5597/00213","DOIUrl":"https://doi.org/10.5597/00213","url":null,"abstract":"This report compiles the current information on morphology, genetics, stable isotopes, acoustics and parasites of bottlenose dolphins along the Southwest Atlantic Ocean (SWAO), which includes waters of Brazil, Uruguay and Argentina. The authors also briefly review the proposed taxonomy for the genus along the Atlantic coast of South America.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"59 1","pages":"16-28"},"PeriodicalIF":0.0,"publicationDate":"2017-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91339047","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}

{"title":"Giant otter (Pteronura brasiliensis) distribution, relative abundance and conservation in northwestern Bolivia","authors":"G. Ayala, R. Wallace, M. Viscarra, Cynthya Jurado","doi":"10.5597/LAJAM00201","DOIUrl":"https://doi.org/10.5597/LAJAM00201","url":null,"abstract":"At the end of the last century northwestern Bolivia was prioritized for further study in a national evaluation of the endangered giant otter (Pteronura brasiliensis). In this paper we present a decade of efforts to investigate and systematize data regarding the distribution and relative abundance of giant otters in this wilderness region including 435 distribution points generated from direct observations, confirmed giant otter signs, and interviews with park guards and local people from indigenous communities. We also sampled 1318.6km of river and stream along the Tuichi, Hondo, Arana, Machariapo, Upper Madidi, Enatahua and Heath rivers and their adjacent oxbow lakes in the Madidi National Park, as well as the Undumo and Tequeje rivers in the Tacana Indigenous Territory, and the lower and mid Madidi River and 42.14km of immediately adjacent oxbow lakes. Relative abundance was variable across the region ranging between 0.02 and 0.18 individual/km sampled in streams and rivers, and our data reveals a particularly important giant otter population along the Madidi River much of which remains unprotected. Our data and local reports point towards a possible population recovery within the Madidi and Pilon Lajas protected areas of the region over the last decade. In total we counted 271 animals, identifying 109 individuals through video and photographic throat pattern evidence. We argue that this previously undocumented population is of particular conservation importance due to its connectivity with the well-documented but currently threatened populations of neighboring southeastern Peru. Together northwestern Bolivia and southeastern Peru represent one of the most important conservation strongholds for this species.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"13 1","pages":"99-106"},"PeriodicalIF":0.0,"publicationDate":"2015-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90608747","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}

{"title":"Protection and monitoring of the giant otter (Pteronura brasiliensis) in Cantão State Park, Tocantins, Brazil","authors":"G. Georgiadis, Silvana Campello, Benaya N. Leles","doi":"10.5597/lajam00208","DOIUrl":"https://doi.org/10.5597/lajam00208","url":null,"abstract":"In 2010, the Instituto Araguaia, a local NGO, started a program to protect and monitor giant otters, and to use them as an umbrella and flagship species for the conservation of the Cantao ecosystem. As part of the program, a census was carried out to determine the giant otter population of a group of 16 lakes in the park, and this population was monitored over a 28-month period spanning three breeding seasons, between September 2010 and December 2012.","PeriodicalId":17967,"journal":{"name":"Latin American Journal of Aquatic Mammals","volume":"33 1","pages":"152-155"},"PeriodicalIF":0.0,"publicationDate":"2015-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88456554","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}