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Artículos de revistas sobre el tema "Guiana dolphin"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 17 de febrero de 2022

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1

Lopes Paitach, Renan, Paulo César Simões-Lopes y Marta Jussara Cremer. "Tidal and seasonal influences in dolphin habitat use in a southern Brazilian estuary". Scientia Marina 81, n.º 1 (27 de marzo de 2017): 49. http://dx.doi.org/10.3989/scimar.04495.25a.

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In this study we describe how franciscana and Guiana dolphin habitat use is influenced by tidal cycles and seasonality in Babitonga Bay. The franciscanas use a greater area in winter and a smaller area in summer, but the extent of the area used did not vary with the tide. Guiana dolphins did not change the extent of the area used within seasons or tides. Franciscanas remained closer to the mouth of the bay and the islands during ebb tide, moving to the inner bay areas and closer to the mainland coast during flood tide. Guiana dolphin used areas closer to the mainland coast during the flood tide. Guiana dolphin patterns of movement do not seem to be related to the tidal current. Franciscanas used sandier areas while Guiana dolphins preferred muddy areas, with some seasonal variation. We suggest that these dolphins modify their distributions based on habitat accessibility and prey availability. This study enhances our knowledge of critical habitat characteristics for franciscana and Guiana dolphins, and these factors should be considered when planning local human activities targeting species conservation.

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2

De Boer, Marijke Nita. "Cetaceans observed in Suriname and adjacent waters". Latin American Journal of Aquatic Mammals 10, n.º 1 (24 de agosto de 2015): 2–19. http://dx.doi.org/10.5597/lajam00189.

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Very little information exists about the cetaceans in the Guianas: Suriname and its neighboring countries Guyana and French Guiana. During a dedicated cetacean survey carried out from a geophysical seismic survey vessel in the offshore waters of Suriname (May-September 2012), the occurrence of 13 cetacean species was documented and of those, 11 were newly documented for this area. The species observed by the author included sperm whale (Physeter macrocephalus), Bryde’s whale (Balaenoptera edeni), false killer whale (Pseudorca crassidens), melon-headed whale (Peponocephala electra), roughtoothed dolphin (Steno bredanensis), long-beaked common dolphin (Delphinus capensis), Fraser’s dolphin (Lagenodelphis hosei), pantropical spotted dolphin (Stenella attenuata) and spinner dolphin (Stenella longirostris). During transit to the survey area (Trinidad to Suriname) incidental sightings were recorded which included common bottlenose dolphin (Tursiops truncatus) off Trinidad, Stenella sp. off Guyana and Guiana dolphin (Sotalia guianensis) at the entrance of the Suriname River. Opportunistic records originating from the periods December 2008-March 2009 and August-October 2012 were forwarded to the author. These records included common bottlenose dolphin, Atlantic spotted dolphin (Stenella frontalis) and short-finned pilot whale (Globicephala macrorhynchus). There is a growing need to identify critical areas for marine biodiversity conservation, both locally and regionally. This paper describes the general occurrence of the cetacean community encountered in Suriname waters in summer. The study revealed that the offshore cetacean community in Suriname is best described as primarily a tropical community, dominated by odontocetes (dolphins and sperm whales). Although the species diversity was relatively high, the overall cetacean relative abundance index (number of animals per 100km effort) was low, which is consistent for tropical equatorial offshore waters. Apart from the sperm whale and the Guiana dolphin, all the other species recorded represent new species records for Suriname. It is recommended that more continuous monitoring in different seasons be carried out in order to gain a better understanding of the occurrence, distribution and status of the different cetacean species within the region.

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3

Dias, Laura Aichinger, Denize Herzing y Leonardo Flach. "Aggregations of Guiana dolphins (Sotalia guianensis) in Sepetiba Bay, Rio de Janeiro, south-eastern Brazil: distribution patterns and ecological characteristics". Journal of the Marine Biological Association of the United Kingdom 89, n.º 5 (21 de julio de 2009): 967–73. http://dx.doi.org/10.1017/s0025315409000782.

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Between August 2005 and July 2007, 376 Guiana dolphin (Sotalia guianensis) encounters were documented in Sepetiba Bay. For the purpose of this study all dolphin sightings were classified as groups or aggregations. Groups (N = 268, x = 20, range = 1–90) consisted of dolphins in apparent association usually engaged in the same behaviour and moving in the same direction. Aggregations (N = 108, x = 204, range = 100–450) consisted of temporal association of numerous groups gathered in an area, totalling several hundred individuals usually engaged in the same behaviour but not necessarily moving in the same direction. Guiana dolphin groups and aggregations differed significantly in behavioural activity, spatial and temporal distribution and age composition. Most aggregated dolphins were engaged in foraging/feeding activities and primarily located at the interior of the bay, and also, aggregations were more likely recorded during morning hours and had more neonates and calves present when compared to groups. The plotted GPS records of aggregations formed two distinct clusters of distribution within the bay, indicating potential areas where conservation strategies could be implemented.

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4

Di Beneditto, Ana Paula Madeira, Clara Da Cruz Vidart Badia y Salvatore Siciliano. "On the feeding habit of the Guiana Dolphin Sotalia guianensis (van Bénedèn, 1864) (Mammalia: Cetartiodactyla: Delphinidae) in southeastern Brazil (~220S): has there been any change in more than two decades?" Journal of Threatened Taxa 9, n.º 2 (26 de febrero de 2017): 9840. http://dx.doi.org/10.11609/jott.2745.9.2.9840-9843.

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Along the north and central coast of Rio de Janeiro State (22025’S–23000’S), southeastern Brazil, the Guiana Dolphin Sotalia guianensis forages on neritic prey, mainly fish. From the analysis of the dolphin’s stomach contents and the identification of partially digested prey, it was verified that the most frequent prey species were young specimens of Trichiurus lepturus. Comparing our results with previous studies on the feeding habits of Guiana Dolphin in the same region, we noticed the maintenance of its feeding preferences during more than two decades, indicating little or no change in the use of prey by this top predator.

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5

Hardt, Fernando Augusto Sliva, Marta Jussara Cremer, Antonio José Tonello Junior, Antonio Bellante, Gaspare Buffa, Giuseppa Buscaino, Salvatore Mazzola, André Silva Barreto, Luiz Antonio Martinelli y Giovanni Maria Zuppi. "Use of carbon and nitrogen stable isotopes to study the feeding ecology of small coastal cetacean populations in southern Brazil". Biota Neotropica 13, n.º 4 (diciembre de 2013): 90–98. http://dx.doi.org/10.1590/s1676-06032013000400009.

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Samples from individuals of the populations of Sotalia guianensis (Guiana) and Pontoporia blainvillei (Franciscana) dolphins living in the Babitonga Bay estuary (26° 28′ S/48° 50′ W), and samples from individuals of a second population of P. blainvillei from a nearshore area (26° 38′ S/48° 41′ W), were collected and analyzed along with their prey between 2000 and 2006, to determine the carbon and nitrogen stable isotope ratios and to verify differences in their feeding ecology. No differences were found in the median ð15N values of Guiana (15.2‰) and Franciscana (15.9‰) dolphins living in Babitonga Bay, nor of nearshore Franciscana (15.0‰) individuals, suggesting no variation in the trophic level of these populations. However, the lack of more information on the isotopic compositions of their putative prey in the nearshore areas prevents the ability to draw definitive conclusions on this issue. The estuarine Franciscana and Guiana dolphin populations presented mean ð13C values of approximately −15.7‰, which were not statistically different from nearshore Franciscana individuals (−14.8‰). Based on stomach content analyses of these species from a previous study, it was reported that there was little overlap in the diet of estuarine Franciscanas and Guiana dolphins. However, based on the similarity of the ð13C values between these two species and of their putative prey, it appears that in fact there is an overlap in the diet of these two species. Based solely on stable isotope analysis, it was not possible to differentiate between estuarine and nearshore Franciscana populations, making it difficult to conclude whether captured nearshore specimens were indeed yearlong residents of these areas. Finally, this study suggests that Franciscana and Guiana dolphin populations are sharing the same resources, mostly L. brevis, D. rhombeus, and S. rastrifer. Therefore, the combination of resource sharing and commercial exploitation of their prey makes these two cetacean species vulnerable.

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6

Rupil, Gabriel M., Juliano André Bogoni, Lupércio Barbosa, Milton César C. Marcondes y Ana Paula Cazerta Farro. "Climate influences on Guiana dolphin diet along the Brazilian coast". Scientia Marina 82, n.º 3 (9 de octubre de 2018): 159. http://dx.doi.org/10.3989/scimar.04775.27a.

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The Guiana dolphin (Sotalia guianensis) is a small-bodied dolphin distributed along the Atlantic coast from Honduras to southern Brazil. It preys on fish, squid and shrimps. Several seminal studies have described its diet, yet relationships between the species’ feeding plasticity and climate gradients remain unknown. We compiled a large database of Guiana dolphin stomach remains from southeast coastal Brazil. We described the species’ diet using a number of descriptors, multivariate analysis of variance to test possible differentiation in diet composition, and the Morisita index to estimate the extent of trophic niche overlap between groups. We also analysed feeding plasticity using a regression tree analysis followed by an ordination analysis. We present new records of prey for the species in Brazil. Our results suggest that the Guiana dolphin has opportunistic feeding habits, which may exhibit the species’ feeding plasticity. Such feeding plasticity is associated with the capability to prey throughout a wide array of climate conditions. From a conservation ecology perspective, we conclude that estuaries—even ones that are over-depleted and succumbing to human impacts—are paramount environments for the Guiana dolphin, serving as important sources of prey for the species and other sympatric marine mammals.

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7

de Moura, Stephane P. G., Mauricio Cantor, Matt K. Broadhurst y Camila Domit. "Environmental and behavioral factors influencing individual variation in spatial use by Guiana dolphins (Sotalia guianensis)". Journal of Mammalogy 102, n.º 4 (7 de junio de 2021): 1009–19. http://dx.doi.org/10.1093/jmammal/gyab056.

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Abstract Marine apex predators, such as coastal dolphins, are key components of ecosystem function and dynamics; understanding their spatial use therefore is important for conservation planning. Here, we describe spatial use of the threatened Guiana dolphin, Sotalia guianensis, within a mosaic of protected areas at their southern range in the Paranaguá estuarine complex (PEC), Brazil. Based on environmental characteristics and S. guianensis population densities, individual photo-identification surveys were focused on two sectors of the northern mouth of the PEC between 2013 and 2015. We photo-identified 107 individuals and recorded 351 groups of Guiana dolphins; nearly 50% of which contained calves. Group sizes were small (mean ± SD: Sector 1 = 3.4 ± 2.7; Sector 2 = 3.6 ± 2.0) and ranged from 1 to 30 individuals. Clustering algorithms were applied to resighted, photo-identified Guiana dolphins to classify individuals as “residents” (sighted in 87% of surveys, n = 11) and “transients” (two clusters; 62%, n = 22; 95%, n = 72). All individuals predominantly were observed foraging (90% in Sector 1 and 76% in Sector 2), but spatial use by transient individuals differed from the residents in terms of environmental (slope, water depth, and rainfall) and behavioral factors (presence of calves and foraging behavior). Compared to transients, resident dolphins ranged over smaller areas, typically more suitable for feeding, calf caring, and more protected from predators and vessels. Because resident Guiana dolphins exhibit small home ranges, they are particularly vulnerable to local anthropogenic activities and habitat loss. These characteristics imply a strong need for regionalized management plans to reduce negative impacts and to maintain the ecological functionality of the species.

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8

Cremer, Marta J., Pedro C. Pinheiro y Paulo C. Simões-Lopes. "Prey consumed by Guiana dolphin Sotalia guianensis (Cetacea, Delphinidae) and franciscana dolphin Pontoporia blainvillei (Cetacea, Pontoporiidae) in an estuarine environment in southern Brazil". Iheringia. Série Zoologia 102, n.º 2 (junio de 2012): 131–37. http://dx.doi.org/10.1590/s0073-47212012000200003.

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The present study provides information about the diet of sympatric populations of small cetaceans in the Babitonga Bay estuary. This is the first study on the diet of these species in direct sympatry. The stomach contents of seven Guiana dolphins Sotalia guianensis and eight franciscanas Pontoporia blainvillei were analyzed. The prey of both cetaceans was mostly teleost fishes, followed by cephalopods. We identified 13 teleost fishes as part of the diet of the franciscanas, and 20 as part of the diet of Guiana dolphins. Lolliguncula brevis was the only cephalopod recorded, and was the most important prey for both cetaceans. Stellifer rastrifer and Gobionellus oceanicus were also important for franciscana, so as Mugil curema and Micropogonias furnieri were important for Guiana dolphins. Stellifer rastrifer and Cetengraulis edentulus were the fishes with the highest frequency of occurrence for franciscana (50%), while Achirus lineatus, C. edentulus, S. brasiliensis, Cynoscion leiarchus, M. furnieri, M. curema, Diapterus rhombeus, Eugerres brasilianus and G. oceanicus showed 28.6% of frequency of occurrence for Guiana dolphins. Franciscanas captured greater cephalopods than the Guiana dolphins in both total length (z= -3.38; n= 40; p< 0.05) and biomass (z = -2.46; n = 40; p<0.05). All of the prey species identified occur inside the estuary, which represents a safe habitat against predators and food availability, reinforcing the importance of the Babitonga Bay for these cetacean populations.

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9

Groch, Kátia R., Adriana C. Colosio, Milton C. C. Marcondes, Daniele Zucca, Josué Díaz-Delgado, Claudia Niemeyer, Juliana Marigo, Paulo E. Brandão, Antonio Fernández y José Luiz Catão-Dias. "Novel Cetacean Morbillivirus in Guiana Dolphin, Brazil". Emerging Infectious Diseases 20, n.º 3 (marzo de 2014): 511–13. http://dx.doi.org/10.3201/eid2003.131557.

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10

Czech-Damal, Nicole U., Alexander Liebschner, Lars Miersch, Gertrud Klauer, Frederike D. Hanke, Christopher Marshall, Guido Dehnhardt y Wolf Hanke. "Electroreception in the Guiana dolphin ( Sotalia guianensis )". Proceedings of the Royal Society B: Biological Sciences 279, n.º 1729 (27 de julio de 2011): 663–68. http://dx.doi.org/10.1098/rspb.2011.1127.

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Passive electroreception is a widespread sense in fishes and amphibians, but in mammals this sensory ability has previously only been shown in monotremes. While the electroreceptors in fish and amphibians evolved from mechanosensory lateral line organs, those of monotremes are based on cutaneous glands innervated by trigeminal nerves. Electroreceptors evolved from other structures or in other taxa were unknown to date. Here we show that the hairless vibrissal crypts on the rostrum of the Guiana dolphin ( Sotalia guianensis ), structures originally associated with the mammalian whiskers, serve as electroreceptors. Histological investigations revealed that the vibrissal crypts possess a well-innervated ampullary structure reminiscent of ampullary electroreceptors in other species. Psychophysical experiments with a male Guiana dolphin determined a sensory detection threshold for weak electric fields of 4.6 µV cm −1 , which is comparable to the sensitivity of electroreceptors in platypuses. Our results show that electroreceptors can evolve from a mechanosensory organ that nearly all mammals possess and suggest the discovery of this kind of electroreception in more species, especially those with an aquatic or semi-aquatic lifestyle.

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11

Espécie, Mariana de A., Rodrigo H. O. Tardin y Sheila M. Simão. "Degrees of residence of Guiana dolphins (Sotalia guianensis) in Ilha Grande Bay, south-eastern Brazil: a preliminary assessment". Journal of the Marine Biological Association of the United Kingdom 90, n.º 8 (21 de septiembre de 2010): 1633–39. http://dx.doi.org/10.1017/s0025315410001256.

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The Guiana dolphin, Sotalia guianensis, is a small delphinid found in coastal areas from northern Honduras to southern Brazil. Little is known about the ecology of this species in several areas of its geographical distribution. In this paper, we present new data about the residency of Guiana dolphins in Ilha Grande Bay, south-eastern Brazil. Boat surveys were conducted at the study area from May 2007 to March 2008. Applying the photo-identification technique, we took pictures of dolphins' dorsal fins, looking for natural markings on them. A total of 17,969 photographs were taken, from which was created a databank of 462 distinct dolphins. Individuals showed different degrees of residency in the bay. More than 50% of the catalogued dolphins were considered non-residents and/or showed a low degree of residence. The average interval between resightings was 35 ± 27.4 days. Animals without markings (calves and juveniles) accounted for 45% (N = 2917) of photographs taken. These results indicate that this population has a fluid structure including different individuals over time. We suggest a possible relationship between the presence of some individuals and local resource availability, such as prey and protected areas.

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12

Groch, Kátia R., Josué Díaz-Delgado, Elitieri B. Santos-Neto, Joana M. P. Ikeda, Rafael R. Carvalho, Raissa B. Oliveira, Emi B. Guari et al. "The Pathology of Cetacean Morbillivirus Infection and Comorbidities in Guiana Dolphins During an Unusual Mortality Event (Brazil, 2017–2018)". Veterinary Pathology 57, n.º 6 (23 de septiembre de 2020): 845–57. http://dx.doi.org/10.1177/0300985820954550.

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Cetacean morbillivirus (CeMV; Paramyxoviridae) is the most significant pathogen of cetaceans worldwide. The novel “multi-host” Guiana dolphin ( Sotalia guianensis; GD)-CeMV strain is reported in South American waters and infects Guiana dolphins and southern right whales ( Eubalaena australis). This study aimed to describe the pathologic findings, GD-CeMV viral antigen distribution and detection by RT-PCR (reverse transcriptase polymerase chain reaction), and infectious comorbidities in 29 Guiana dolphins that succumbed during an unusual mass-mortality event in Rio de Janeiro state, Brazil, between November 2017 and March 2018. The main gross findings were lack of ingesta, pulmonary edema, ascites, icterus, hepatic lipidosis, multicentric lymphadenomegaly, as well as pneumonia, polyserositis, and multiorgan vasculitis caused by Halocercus brasiliensis. Microscopically, the primary lesions were bronchointerstitial pneumonia and multicentric lymphoid depletion. The severity and extent of the lesions paralleled the distribution and intensity of morbilliviral antigen. For the first time in cetaceans, morbilliviral antigen was detected in salivary gland, optic nerve, heart, diaphragm, parietal and visceral epithelium of glomeruli, vulva, and thyroid gland. Viral antigen within circulating leukocytes suggested this as a mechanism of dissemination within the host. Comorbidities included disseminated toxoplasmosis, mycosis, ciliated protozoosis, and bacterial disease including brucellosis. These results provide strong evidence for GD-CeMV as the main cause of this unusual mass-mortality event.

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13

Rossi-Santos, Marcos R. y Paulo A. C. Flores. "Feeding Strategies of the Guiana Dolphin Sotalia guianensis". Open Marine Biology Journal 3, n.º 1 (11 de mayo de 2009): 70–76. http://dx.doi.org/10.2174/1874450800903010070.

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14

Wedekin, Leonardo L., Fábio G. Daura-Jorge y Paulo C. Simões-Lopes. "Habitat preferences of Guiana dolphins, Sotalia guianensis (Cetacea: Delphinidae), in Norte Bay, southern Brazil". Journal of the Marine Biological Association of the United Kingdom 90, n.º 8 (4 de octubre de 2010): 1561–70. http://dx.doi.org/10.1017/s0025315410001414.

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Habitat preference and spatial distribution of Guiana dolphins (Sotalia guianensis) in Norte Bay, southern Brazil, was studied from 2001 to 2005. Boat surveys (N = 91) were made to evaluate the spatial distribution of the dolphins. Seven habitat variables were integrated into a geographical information system, and habitat preference was tested using the ‘Neu method’ and a habitat index. The Guiana dolphins did not use all habitat types in the same proportion as were available. Areas used more intensively included, in order of importance: (1) areas with a steep sloping sea-floor; (2) areas further from urban areas; (3) areas further from mangroves; (4) areas near the mouth of the bay; (5) shallow water areas; (6) areas of clayey-silt sediments; and (7) areas close to shore. From 2001 to 2005 there was a shift in spatial distribution and habitat use by the dolphins. The low frequency of use of areas close to urban encroachment and its related impacts to the marine environment raises concern about the coastal habitat destruction. The Guiana dolphin may be considered a habitat specialist, despite its wide latitudinal distribution in the western Atlantic Ocean. The ecological niche of the species may be defined by a narrow strip of shallow coastal waters (mostly < 30 m) bordering the coastline. The shift in the spatial use was probably linked with changes in the abundance of important prey of the species and possibly was caused by the collapse of a fish stock in the study area region. Different habitats may favour different assemblages of prey and consequently different foraging strategies by the dolphins. Human-related habitat alterations throughout the range of this species are likely to affect dolphins' ecology in many ways and, thus, must be evaluated and mitigated to conserve their critical habitats.

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15

Mayorga, Luis Felipe S. P., Ralph E. T. Vanstreels, Renata C. C. Bhering, Natália Mamede, Luiz M. B. Costa, Flavia C. F. Pinheiro, Luciano W. D. Reis et al. "Strandings of cetaceans on the Espírito Santo coast, southeast Brazil, 1975–2015". ZooKeys 948 (13 de julio de 2020): 129–52. http://dx.doi.org/10.3897/zookeys.948.50468.

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Espírito Santo state is located on the eastern margin of Brazil, in a transitional tropical-subtropical area (18°S–21°S) dominated by oligotrophic waters. With the exception of humpback whales (Megaptera novaeangliae), the cetacean community of Espírito Santo has been understudied. In addition to the chronic impacts from fisheries, marine pollution, urban development, and coastal habitat degradation, in November 2015 the cetacean communities of Espírito Santo were challenged by the greatest environmental disaster in Brazil’s history. The Mariana dam disaster caused 60 million cubic meters of mining waste to be washed into the Doce River, which ultimately flowed to the coastal waters of Espírito Santo, with a high concentration of heavy metals. This study reviews and updates information on cetacean strandings in the state of Espírito Santo (excluding humpback whales) prior to this disaster. From 1975 to September 2015, there were 461 recorded cetacean strandings, representing 20 species. An average 1.18 strandings per 100 km per month were recorded since a state-wide daily beach survey program was implemented in October 2010, contrasting with the 0.14 strandings per 100 km per month in previous years. Six species comprised the majority (94.7%) of stranding events: Guiana dolphin (Sotalia guianensis), Franciscana (Pontoporia blainvillei), rough-toothed dolphin (Steno bredanensis), bottlenose dolphin (Tursiops truncatus), sperm whale (Physeter macrocephalus), and melon-headed whale (Peponocephala electra). Oceanic cetaceans stranded most frequently on the southern portion of Espírito Santo, where the continental platform is narrower, whereas the strandings of coastal cetaceans such as Guiana dolphins and Franciscanas were concentrated near estuaries, especially the Doce River. This is particularly concerning in face of the Mariana dam disaster, which drastically altered the estuarine and coastal environment associated with the Doce River.

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Gonzales-Viera, O., J. Marigo, V. Ruoppolo, F. C. W. Rosas, C. T. Kanamura, C. Takakura, A. Fernández y J. L. Catão-Dias. "Toxoplasmosis in a Guiana dolphin (Sotalia guianensis) from Paraná, Brazil". Veterinary Parasitology 191, n.º 3-4 (enero de 2013): 358–62. http://dx.doi.org/10.1016/j.vetpar.2012.09.012.

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17

Andrade, Luciana Guimarães de, Tatiana Lemos Bisi, José Lailson-Brito y Alexandre de Freitas Azevedo. "Burst pulses of Guiana dolphin (Sotalia guianensis) in southeastern Brazil". Journal of the Acoustical Society of America 141, n.º 4 (abril de 2017): 2947–56. http://dx.doi.org/10.1121/1.4981768.

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18

Maciel, Israel S., Guilherme Maricato, Luciene Marqui, Maria Alice S. Alves y Rodrigo H. Tardin. "Home Alone: Solitary Rough-Toothed Dolphin (Steno bredanensis) in Residence Area of Guiana Dolphins (Sotalia guianensis)". Aquatic Mammals 46, n.º 1 (15 de enero de 2020): 42–48. http://dx.doi.org/10.1578/am.46.1.2020.42.

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19

Sacristán, C., F. Esperón, J. Marigo, AC Ewbank, RR de Carvalho, KR Groch, PV de Castilho et al. "Molecular identification and microscopic characterization of poxvirus in a Guiana dolphin and a common bottlenose dolphin, Brazil". Diseases of Aquatic Organisms 130, n.º 3 (27 de septiembre de 2018): 177–85. http://dx.doi.org/10.3354/dao03271.

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20

Oshima, Júlia Emi de Faria, Marcos César de Oliveira Santos, Mariel Bazzalo, Paulo André de Carvalho Flores y Fabiano do Nascimento Pupim. "Home ranges of Guiana dolphins (Sotalia guianensis) (Cetacea: Delphinidae) in the Cananéia estuary, Brazil". Journal of the Marine Biological Association of the United Kingdom 90, n.º 8 (1 de septiembre de 2010): 1641–47. http://dx.doi.org/10.1017/s0025315410001311.

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Home ranges of seven Guiana dolphins (Sotalia guianensis) (Van Bénéden, 1864) were studied in the Cananéia estuary (~25°03′S 47°55′W), south-eastern Brazil. Boat-based observations were conducted from May 2000 to July 2003 in ~132 km2 of protected inner waters. The photo-identification technique was used to follow naturally marked individuals through time and space. From a total of 138 catalogued individuals, five males and two females presented 20+ sightings and were used for home range estimation. Sightings were plotted and analysed in a Geographic Information System (GIS). With the ‘Home Range Tools’ extension the fixed kernel density estimator with band width (smoothing parameter) chosen via least squares cross-validation was performed for each individual. The fixed kernel method was used to estimate the non-parametric utility distribution of each dolphin, keeping band width (h) constant for a data set. The first polygons created by these parameters had an amoeboid shape and in some cases more than one centre of activity. The 95% home range estimated outlines varied from 1.6 to 22.9 km2 (7.9 ± 8.3 km2). This large interval shows strong evidences on individual variation in S. guianensis' home ranges. Several individuals showed small home ranges when compared to other cetacean species. An overlap of home ranges of different sizes and shapes were observed for Guiana dolphins with large range movements. Centres of activity were concentrated in the main entrance of the Cananéia estuary. This was a first attempt to understand the way S. guianensis uses the Cananéia estuary and such data are essential for conservation and management purposes.

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21

Groch, Kátia R., Elitieri B. Santos-Neto, Josué Díaz-Delgado, Joana M. P. Ikeda, Rafael R. Carvalho, Raissa B. Oliveira, Emi B. Guari et al. "Guiana Dolphin Unusual Mortality Event and Link to Cetacean Morbillivirus, Brazil". Emerging Infectious Diseases 24, n.º 7 (julio de 2018): 1349–54. http://dx.doi.org/10.3201/eid2407.180139.

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22

Bittencourt, Lis, Isabela M. S. Lima, Luciana G. Andrade, Rafael R. Carvalho, Tatiana L. Bisi, José Lailson-Brito y Alexandre F. Azevedo. "Underwater noise in an impacted environment can affect Guiana dolphin communication". Marine Pollution Bulletin 114, n.º 2 (enero de 2017): 1130–34. http://dx.doi.org/10.1016/j.marpolbul.2016.10.037.

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23

Teixeira, Clarissa R., Caio N. Louzada, Andreas L. S. Meyer y Emygdio L. A. Monteiro-Filho. "Variation in Guiana dolphin parental care according to calf age class". acta ethologica 21, n.º 2 (26 de marzo de 2018): 119–26. http://dx.doi.org/10.1007/s10211-018-0289-4.

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24

Leão Martins, Dalila T., Marcos R. Rossi-Santos y Flávio José De Lima Silva. "Effects of anthropogenic noise on the acoustic behaviour of Sotalia guianensis (Van Bénéden, 1864) in Pipa, North-eastern Brazil". Journal of the Marine Biological Association of the United Kingdom 98, n.º 2 (3 de octubre de 2016): 215–22. http://dx.doi.org/10.1017/s0025315416001338.

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This study investigated the emission of subaquatic noise from recreational tourism motorboats, schooners and a sea-bottom mounted water pump. Analyses demonstrated alterations in several whistle (IF: t = 2.42, P = 0.015; FF: t = −2.22, P = 0.025) and calls patterns (MIF: t = −3.13, P = 0.001; MAF: t = −3.49, P = 0.0005; FD: t = −2.21, P = 0.027; D: t = 2.89, P = 0.004), caused primarily by motorboats. Duration of clicks was also modified (D: t = −3.85, P = 0.0001), mainly by the water pump. The frequency range of all noises (0.43–35.8 kHz) overlaps that used by dolphins (1–48 kHz), causing sound emissions changes, with a considerable increase in number of whistles and a reduction in clicks trains. These changes may be a strategy developed by these dolphins to overcome the noise band. Mitigation measures, such as boating regulations and environmental education for the local community, boaters and tourists are needed to conserve the species. The Guiana dolphin population is apparently already suffering, evidenced by diminished residence time and reduced number of individuals entering the inlet during the presence of pleasure craft.

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25

Daura-Jorge, Fábio G., Leonardo L. Wedekin y Paulo C. Simões-Lopes. "Feeding habits of the Guiana dolphin, Sotalia guianensis (Cetacea: Delphinidae), in Norte Bay, southern Brazil". Scientia Marina 75, n.º 1 (7 de febrero de 2011): 163–69. http://dx.doi.org/10.3989/scimar.2011.75n1163.

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26

Souza, Shirley Pacheco de. "Payment for Environmental Services, fishers and cetaceans’ conservation". Labor e Engenho 7, n.º 4 (1 de diciembre de 2013): 5–12. http://dx.doi.org/10.20396/lobore.v7i4.162.

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The interactions between fisheries and cetaceans have been widely discussed by several authors. Bycatch of small cetaceans is frequent around the world, threatening several species. In Brazil, in two critical areas– Soure(Marajó Island) and São Sebastião - more than 70% of the local fishers (n= 40 and n=70, respectively) interviewed in a previous study reported bycatch of Guiana dolphin (Sotalia guianensis) or Franciscana dolphin (Pontoporia blainvillei) in gillnets. Other negative interaction involving fisheries and cetaceans is the entanglement of Southern right whales in fishing nets during their migration along the coast, as reported by 68% of the fishers interviewed in the South of Brazil (Pântano do Sul: n=25). On the other hand these interactions result in damage of the fishing gear and great economic losses to the fishers. To minimize these conflicts we suggest the adoption of strategies involving interested fishers in bycatch monitoring programs, where fishers could collect local data on the critical areas and frequency of dolphins’ accidental catches, consequently increasing their awareness of the problem and providing a better baseline to support educational and regulatory measures related to cetaceans’ bycatch. As a compensation for the time and energy spent in these programs, fishers could receive a “payment for environmental services” (PES), as an economic incentive to their participation, which would contribute to their economic stability as well as to cetaceans’ conservation.

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27

Costa-Silva, Samira, Carlos Sacristán, Omar Gonzales-Viera, Josué Díaz-Delgado, Angélica María Sánchez-Sarmiento, Juliana Marigo, Kátia Regina Groch et al. "Toxoplasma gondii in cetaceans of Brazil: a histopathological and immunohistochemical survey". Revista Brasileira de Parasitologia Veterinária 28, n.º 3 (julio de 2019): 395–402. http://dx.doi.org/10.1590/s1984-29612019051.

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Abstract Toxoplasmosis is a parasitic disease caused by the protozoan Toxoplasma gondii. In cetaceans, T. gondii infection is a significant cause of morbidity and mortality. Despite the worldwide range and broad cetacean host record of T. gondii infection, there is limited information on toxoplasmosis in cetaceans from the Southern hemisphere. We investigated the occurrence of T. gondii by histopathology and immunohistochemistry in tissue samples of 185 animals comprising 20 different cetacean species from Brazil. Three out of 185 (1.6%) animals presented T. gondii-associated lesions: a captive killer whale Orcinus orca, a free-ranging common bottlenose dolphin Tursiops truncatus and a free-ranging Guiana dolphin Sotalia guianensis. The main lesions observed in these animals were necrotizing hepatitis, adrenalitis and lymphadenitis associated with protozoal cysts or extracellular tachyzoites presenting immunolabeling with anti-T. gondii antibodies. This study widens the spectrum of species and the geographic range of this agent in Brazil, and provides the first reports of T. gondii infection in a captive killer whale and in a free-ranging common bottlenose dolphin in South America.

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Izidoro, Flavia B. y Yvonnick Le Pendu. "Rostrum Contact Behaviors by the Guiana Dolphin (Sotalia guianensis) in Ilhéus, Brazil". Aquatic Mammals 42, n.º 2 (1 de junio de 2016): 203–9. http://dx.doi.org/10.1578/am.42.2.2016.203.

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Lunardi, Diana G. y Renata G. Ferreira. "Group composition influences on behavioral sequence patterns of the Guiana dolphin Sotalia guianensis". Journal of Ethology 31, n.º 1 (23 de octubre de 2012): 49–53. http://dx.doi.org/10.1007/s10164-012-0347-8.

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30

Ribeiro-Campos, Ana, Karina S. Pereira, Carlos Eduardo P. Quintana, Mariana Barbosa, Carolina P. Dias, Juliana A. Brião, Carlos Vinícius C. dos Santos et al. "Habitat use by the Guiana dolphin (Sotalia guianensis) (Cetartiodactyla: Delphinidae) in southeastern Brazil". Regional Studies in Marine Science 44 (mayo de 2021): 101778. http://dx.doi.org/10.1016/j.rsma.2021.101778.

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31

Barrios-Garrido, Héctor, Kareen De Turris-Morales, Chloe M. Nash, Gabriela Delgado-Ortega y Nínive Espinoza-Rodríguez. "Acoustic Parameters of Guiana Dolphin (Sotalia guianensis) Whistles in the Southern Gulf of Venezuela". Aquatic Mammals 42, n.º 2 (1 de junio de 2016): 127–36. http://dx.doi.org/10.1578/am.42.2.2016.127.

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32

Vidal, Lara G., Monizze Vannuci-Silva, Mariana B. Alonso, Maria L. Feo, Cayo Corcellas, Tatiana L. Bisi, Leonardo Flach et al. "Pyrethroid insecticides along the Southwestern Atlantic coast: Guiana dolphin (Sotalia guianensis) as a bioindicator". Science of The Total Environment 728 (agosto de 2020): 138749. http://dx.doi.org/10.1016/j.scitotenv.2020.138749.

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33

Caballero, S. y C. S. Baker. "Captive-born intergeneric hybrid of a Guiana and bottlenose dolphin: Sotalia guianensis×Tursiops truncatus". Zoo Biology 29, n.º 5 (23 de diciembre de 2009): 647–57. http://dx.doi.org/10.1002/zoo.20299.

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34

Seade, Gisele C. C., Valíria D. Cerqueira, Eva Sierra, Jaese F. Chaves, Márcio A. O. Moura, Daniele P. Montão, Gabriela Riet-Correa et al. "Herpesviral infection in a Guiana dolphin (Sotalia guianensis) from the northern coast of Brazil". Journal of Veterinary Diagnostic Investigation 29, n.º 6 (18 de agosto de 2017): 877–79. http://dx.doi.org/10.1177/1040638717727794.

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35

Siciliano, Salvatore, Leandro G. Corrêa y Ana Paula M. Di Beneditto. "Real-Time Record of Entanglement of a Guiana Dolphin (Sotalia guianensis) in Recreational Fishing Ge". Aquatic Mammals 43, n.º 3 (15 de mayo de 2017): 320–23. http://dx.doi.org/10.1578/am.43.3.2017.320.

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36

Rodrigues, Vitor Leonardo A., Leonardo L. Wedekin, Milton César C. Marcondes, Lupércio Barbosa y Ana Paula C. Farro. "Diet and foraging opportunism of the Guiana dolphin ( Sotalia guianensis ) in the Abrolhos Bank, Brazil". Marine Mammal Science 36, n.º 2 (abril de 2020): 436–50. http://dx.doi.org/10.1111/mms.12656.

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37

Ywasaki Lima, Juliana, Filipe Brum Machado, Ana Paula Cazerta Farro, Lupércio de Araújo Barbosa, Leonardo Serafim da Silveira y Enrique Medina-Acosta. "Population genetic structure of Guiana dolphin (Sotalia guianensis) from the southwestern Atlantic coast of Brazil". PLOS ONE 12, n.º 8 (24 de agosto de 2017): e0183645. http://dx.doi.org/10.1371/journal.pone.0183645.

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38

Deconto, Lucimary S. y Emygdio L. A. Monteiro-Filho. "Day and night sounds of the Guiana dolphin, Sotalia guianensis (Cetacea: Delphinidae) in southeastern Brazil". acta ethologica 19, n.º 1 (26 de octubre de 2015): 61–68. http://dx.doi.org/10.1007/s10211-015-0223-y.

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39

Santos, MCO, JEF Oshima, ES Pacífico y E. Silva. "Group size and composition of Guiana dolphins (Sotalia guianensis) (Van Bénèden, 1864) in the Paranaguá Estuarine Complex, Brazil". Brazilian Journal of Biology 70, n.º 1 (febrero de 2010): 111–20. http://dx.doi.org/10.1590/s1519-69842010000100015.

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The aim of the present study was to describe the characteristics of Guiana dolphins (S. guianensis) group size and composition in the Paranaguá Estuarine Complex (25° 15' -25° 36' S and 48° 02'-48° 45' W), Paraná State, as well as to verify the existence of relationships between a given environmental variable (water depth, salinity, transparency and temperature) and group size. An area of around 124 km² was surveyed by boat from April 2006 to February 2008 in the following subsets of the estuary: Canal do Superagui (~28 km²), Pinheiros bay (~34 km²), part of Laranjeiras bay, which included the Guaraqueçaba sub-estuary (~38 km²), and part of the Mixture Section of the Paranaguá Estuarine Complex (~24 km²). In 45 survey days, a total of 147 hours were spent observing 286 groups of S. guianensis. Groups varied from two individuals to aggregations of up to 90 individuals (mean ± SD: 11.5 ± 14.4 individuals). Solitary individuals were seen only on five occasions (1.7% of all observations). Groups with calves (n = 247) represented 86.4% overall and were more common in all sub-areas when compared to groups without calves. Groups without calves were found in all sub-areas and were usually smaller and composed of up to 12 individuals. A usual group composition of 70% of adults and 30% of calves was observed considering all sub-areas and seasons. No correlations were found between group size and water temperature (Spearman's rank test, r = 0.0059, p = 0.9338), transparency (Spearman's rank test, r = 0.0597, p = 0.9333), depth (Spearman's rank test, r = 0.1421, p = 0.4698), and salinity (Spearman's rank test, r = -0.1938, p = 0.0665). While Guiana dolphin groups were seen in the entire surveyed area, group size varied significantly among the three main surveyed sub-areas (Kruskal Wallis, H2,196 = 29.85, p = 0.0000). Groups were larger in Laranjeiras bay and smaller in Canal do Superagui. The physical environment, risk of predation, seasonal distribution and abundance of prey are the main possible factors driving larger groups in inner and protected waters.

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40

Oshima, Júlia Emi de Faria y Marcos César de Oliveira Santos. "Guiana dolphin home range analysis based on 11 years of photo-identification research in a tropical estuary". Journal of Mammalogy 97, n.º 2 (4 de enero de 2016): 599–610. http://dx.doi.org/10.1093/jmammal/gyv207.

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Abstract Home range studies provide significant insights on social organization and interactions, limiting resources and habitat use. Knowledge on home range and habitat use by Guiana dolphins, Sotalia guianensis , is still scarce. The aim of this study was to identify and analyze individual’s home ranges of Guiana dolphins in the Cananéia Estuary (~25°03′S, 47°55′W), located in southeastern Brazil. Photo-identification efforts were conducted between 2000 and 2010. From a total of 135,918 pictures taken, 34,086 (25%) were useful for individual identification. Two-hundred and five individuals were cataloged based on permanent notches along dorsal fin borders. Of the cataloged individuals, 31 had been identified a minimum of 20 times, on distinct dates, prior to this analysis. Home ranges were estimated for these individuals using 4 methods: minimum convex polygon (MCP), adaptive kernel with least-squares cross-validation (AKLSCV), fixed kernel with reference bandwidth (FKHREF), and fixed kernel with least-squares cross-validation (FKLSCV). The sizes of the estimated home ranges varied between 2.2 and 43.8 km 2 ( X¯ = 17.5 km 2 ) with MCP, between 0.8 and 82.5 km 2 ( X¯ = 15.6 km 2 ) with AKLSCV, between 3.9 and 244 km 2 ( X¯ = 72.4 km 2 ) with FKHREF, and from 0.6 to 70.6 km 2 ( X¯ = 13.5 km 2 ) with FKLSCV. Significant differences in size and shape of the generated areas were detected when comparing the 4 tested methods. Variation of individual’s home range sizes and an extensive overlap among home ranges of different Guiana dolphins in the Cananéia Estuary provide evidence that the region supports important resources for this species. Therefore, preventing habitat loss in this region is essential to guaranteeing the persistence of this population. O estudo sobre o uso de área pode fornecer informações sobre organização social e interações, recursos limitantes e sobre o uso de habitat. Ainda é escasso o conhecimento sobre como o boto-cinza, Sotalia guianensis usa seu habitat. O objetivo deste estudo foi identificar e analisar as áreas de uso individuais de S. guianensis no estuário de Cananéia (~25°03′S; 47°55′W), localizado no sudeste brasileiro. Os esforços de foto-identificação foram realizados entre os anos de 2000 e 2010. De um total de 135.918 fotografias tomadas, 34.086 (25%) foram úteis para identificações individuais. Duzentos e cinco indivíduos foram catalogados através das marcas permanentes presentes em suas nadadeiras dorsais. Dentre os indivíduos catalogados, 31 foram identificados ao menos em 20 ocasiões, em dias distintos, antes destas análises. As áreas de uso foram estimadas para estes indivíduos utilizando quatro métodos distintos: mínimo polígono convexo (MPC), kernel adaptativo com largura determinada pelo método de validação cruzada de quadrados mínimos (AKLSCV), kernel fixo com largura de referência (FKHREF) e kernel fixo com largura determinada pelo método de validação cruzada de quadrados mínimos (FKLSCV). Os tamanhos das áreas de uso geradas variaram entre 2,2 e 43,8 km 2 ( X¯ = 17,5 km 2 ) com o uso do MPC, 0,8 e 82,5 km 2 ( X¯ = 15,6 km 2 ) com o uso do AKLSCV, 3,9 e 244 km 2 ( X¯ = 72,4 km 2 ) com o uso do FKHREF, e de 0,6 a 70,6 km 2 ( X¯ = 13,5 km 2 ) com o uso do FKLSCV. Foram detectadas diferenças significativas no tamanho e formato das áreas geradas pelos quatro métodos testados. Variações nos tamanhos das áreas de uso individuais e a extensa sobreposição entre diferentes áreas de uso dos botos-cinza no estuário de Cananéia fornecem evidências de que a região provê recursos importantes para esta espécie. Portanto, prevenir a perda de habitat na região é essencial para garantir a persistência dessa população.

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41

Tardin, Rodrigo H. O., Mariana A. Espécie, Liliane Lodi y Sheila M. Simão. "Parental care behavior in the Guiana dolphin, Sotalia guianensis (Cetacea: Delphinidae), in Ilha Grande Bay, southeastern Brazil". Zoologia (Curitiba) 30, n.º 1 (febrero de 2013): 15–23. http://dx.doi.org/10.1590/s1984-46702013000100002.

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42

Lunardi, Diana G. y Renata G. Ferreira. "Fission-fusion dynamics of Guiana dolphin (Sotalia guianensis) groups at Pipa Bay, Rio Grande do Norte, Brazil". Marine Mammal Science 30, n.º 4 (7 de marzo de 2014): 1401–16. http://dx.doi.org/10.1111/mms.12121.

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43

Espinoza-Rodríguez, Nínive, Kareen De Turris-Morales, Takahiro Shimada y Héctor Barrios-Garrido. "Guiana Dolphin (Sotalia guianensis) in the southern Gulf of Venezuela: Seasonal distribution, group size, and habitat use". Regional Studies in Marine Science 32 (noviembre de 2019): 100874. http://dx.doi.org/10.1016/j.rsma.2019.100874.

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44

Oliveira, Elaine C. da S., Rodrigo H. Tardin, Fabiana R. Poletto y Sheila M. Simão. "Coordinated feeding behavior of the Guiana dolphin, Sotalia guianensis (Cetacea: Delphinidae), in southeastern Brazil: a comparison between populations". Zoologia (Curitiba) 30, n.º 6 (diciembre de 2013): 585–91. http://dx.doi.org/10.1590/s1984-46702013005000013.

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45

Ferro de Godoy, Daniela, Jocemar Tomasino Mendonça y Artur Andriolo. "Occurrence of Guiana dolphin ( Sotalia guianensis ) in southeast of Brazil: Driven by prey distribution or human fishing activity?" Aquatic Conservation: Marine and Freshwater Ecosystems 30, n.º 10 (12 de junio de 2020): 1910–21. http://dx.doi.org/10.1002/aqc.3367.

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46

Tardin, Rodrigo H. O., Mariana A. Especie, Mariana F. Nery, Felipe T. D'Azeredo y Sheila M. Simão. "Coordinated feeding tactics of the Guiana dolphin, Sotalia guianensis (Cetacea: Delphinidae), in Ilha Grande Bay, Rio de Janeiro, Brazil". Zoologia (Curitiba, Impresso) 28, n.º 3 (junio de 2011): 291–96. http://dx.doi.org/10.1590/s1984-46702011000300002.

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47

Deconto, Lucimary S. y Emygdio L. A. Monteiro-Filho. "Differences in the sounds of Guiana dolphin Sotalia guianensis (Cetacea: Delphinidae) between two areas of south-eastern and southern Brazil". Bioacoustics 28, n.º 1 (23 de agosto de 2017): 26–41. http://dx.doi.org/10.1080/09524622.2017.1361337.

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48

Lailson-Brito, José, Renato Cruz, Paulo Renato Dorneles, Leonardo Andrade, Alexandre de Freitas Azevedo, Ana Bernadete Fragoso, Lara Gama Vidal et al. "Mercury-Selenium Relationships in Liver of Guiana Dolphin: The Possible Role of Kupffer Cells in the Detoxification Process by Tiemannite Formation". PLoS ONE 7, n.º 7 (31 de julio de 2012): e42162. http://dx.doi.org/10.1371/journal.pone.0042162.

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49

de Andrade, Luciana Guimarães, Isabela Maria Seabra Lima, Halerson da Silva Macedo, Rafael Ramos de Carvalho, José Lailson-Brito, Leonardo Flach y Alexandre de Freitas Azevedo. "Variation in Guiana dolphin (Sotalia guianensis) whistles: using a broadband recording system to analyze acoustic parameters in three areas of southeastern Brazil". acta ethologica 18, n.º 1 (8 de marzo de 2014): 47–57. http://dx.doi.org/10.1007/s10211-014-0183-7.

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50

Manhães, B. M. R., E. B. Santos-Neto, L. R. Tovar, E. B. Guari, L. Flach, D. Kasper, P. M. A. Galvão et al. "Changes in mercury distribution and its body burden in delphinids affected by a morbillivirus infection: Evidences of methylmercury intoxication in Guiana dolphin". Chemosphere 263 (enero de 2021): 128286. http://dx.doi.org/10.1016/j.chemosphere.2020.128286.

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