Environment and anthropogenic activities influence cetacean habitat use in southeastern Brazil

Tardin, Rodrigo H.; Chun, Yongwan; Jenkins, Clinton N.; Maciel, Israel de Sá; Simão, Sheila M.; Alves, Maria Alice S.

doi:10.3354/meps12937

Cited by 16 publications

(16 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Jefferson, Webber & Pitman (2008) and Kato & Perrin (2009) suggested that Bryde's whales have a preference for areas with higher productivity in tropical and subtropical basins. Tardin et al (2019) showed a positive correlation between B. edeni and high concentrations of chl-a in depths between 30 and 60m in southeast Brazil.…”

Section: B Edenimentioning

confidence: 87%

Cetaceans along the southeastern Brazilian coast: occurrence, distribution and niche inference at local scale

Figueiredo

Amaral

Santos

2020

PeerJ

View full text Add to dashboard Cite

It is deemed important to understand cetacean occurrence and distribution to comprehend their ecological roles. The geographical occurrence of species’ niche can be used to better describe their potential distribution. The niche can be defined using environmental variables. Those variables are considered static and not affected by biological activities. The present study goal was to assess the occurrence and distribution of cetaceans along the southeastern Brazilian coast, as well as to define the fundamental and realized niche of each species and to investigate niche overlap at local scale. The environmental requirements for each species were also investigated throughout statistical tests. Sighting data were obtained through oceanographic surveys conducted between 2012 and 2015. The environmental variables available on MARSPEC and the software NicheA were used for the ecological niche modeling. A total of twelve cetacean species were identified and the potential distribution areas of the six commonest ones were defined. Even though the species presented different environmental preferences, most of them had partial overlap among niches and potential distribution areas. The environmental heterogeneity of the study area might support the co-occurrence of different species with different environmental requirements.

show abstract

Section: B Edenimentioning

confidence: 87%

Cetaceans along the southeastern Brazilian coast: occurrence, distribution and niche inference at local scale

Figueiredo

Amaral

Santos

2020

PeerJ

View full text Add to dashboard Cite

show abstract

“…Therefore, varied feeding habits are major factors affecting differences in cetacean habitat use (Azzellino, Gaspari, Airoldi, & Nani, 2008; Moreno et al, 2005; Pansard, 2009). However, other factors besides prey, such as abiotic variables, can also contribute to the differences in the environments used by cetaceans (Arcangeli, Campana, Marini, & Macleod, 2016; Bearzi, Azzellino, Politi, Costa, & Bastianini, 2008; Bräger et al, 2003; Dalla Rosa, Ford, & Trites, 2012; Davis et al, 1998; Evans & Bjørge, 2013; Gaskin, 1968; Godoy, Andriolo, & Filla, 2015; Kanaji, Okazaki, Watanabe, & Miyashita, 2016; Karczmarski et al, 2000; Lambert et al, 2014; Learmonth et al, 2006; Littaye, Gannier, Laran, & Wilson, 2004; MacLeod, 2009; Paradell, López & Methion, 2019; Southall et al, 2019; Tardin et al, 2019). Mangroves associated with estuaries are important and productive ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Occurrence of Guiana dolphin (Sotalia guianensis) in southeast of Brazil: Driven by prey distribution or human fishing activity?

Godoy

Mendonça

Andriolo

2020

Aquatic Conservation

View full text Add to dashboard Cite

1. This study used models to assess how the type of prey caught by artisanal fishermen influenced the occurrence of Guiana dolphins (Sotalia guianensis) in the region of the estuarine lagunar comple.x of Cananéia (São Paulo, Brazil). 2. The data were collected from January 2012 to November 2014, during three fieldwork expeditions per season (spring, summer, autumn, winter). 3. Mullets (Mugil liza) were the fish with the highest association to dolphins, followed by Oligoplites spp. and Lobotes spp.; Mugil curema and shrimp, on the other hand, negatively influenced their distribution. The presence of fish-weir fisheries in the estuary also had a positive influence on the occurrence of dolphins, since this fishing gear is used as a barrier, minimizing the potential for their prey to escape.

show abstract

“…Point locations of the dolphin groups were recorded using a GARMIN VISTA CX GPS device. The recorded data consisted of the initial location of the group and of consecutive locations updated whenever the position of the focal individual had been displaced by 500 m (see Tardin et al, for more details).…”

Section: Methodsmentioning

confidence: 99%

Modelling habitat use by the Guiana dolphin, Sotalia guianensis, in south‐eastern Brazil: Effects of environmental and anthropogenic variables, and the adequacy of current management measures

Tardin

Maciel

Espécie

et al. 2020

Aquatic Conservation

View full text Add to dashboard Cite

1. Species distribution modelling has been used to identify critical habitats for the delimitation of Marine Protected Areas. Although Marine Protected Areas may often overlap with the distribution of key marine species, illegal human activities often continue within these areas, causing negative impacts on the local biodiversity. 2. A generalized linear model with spatial eigenvector mapping was used to investigate, for the first time, the influence of environmental variables and anthropic activities on the number of Guiana dolphin, Sotalia guianensis sightings/grid, and to determine whether a Marine Reserve, in south-eastern Brazil, is adequate for the protection of the local population. Data were collected between May 2007 and October 2013 onboard a 7.5-m vessel with an inboard engine.3. The models for the different periods (annual, dry, and rainy seasons) all indicated that depth, the distance to seafood farms and fishing grounds, and mean sea surface temperatures influenced the distribution of the dolphins within the study area. The annual and seasonal models predicted that the dolphins prefer a continuous area between Cedro and Pico Islands, a large area that lies outside the limits of the Marine Reserve. 4. Although the habitat of Ilha Grande bay is still much less degraded than that inhabited by other nearby Guiana dolphin populations, the results of the present study indicate that anthropic activities in this area influence habitat use by the dolphins. Less than 30% of the area used by the dolphins is protected by the Tamoios Ecological Station (ESEC Tamoios). 5. Sotalia guianensis is classified as 'Vulnerable' in Brazil, although the marine reserve (ESEC Tamoios) does not protect the core area used by the local dolphin population. The results of the present study provide specific locations for the creation of a new multiple-use MPA, as suggested by the Brazilian National Action Plan for the Conservation of Small Cetaceans, or the inclusion of a special management programme for the area between Cedro and Pico islands to better protect the dolphins in the ESEC Tamoios buffer zone. The continuation of surveys to better

show abstract

Environment and anthropogenic activities influence cetacean habitat use in southeastern Brazil

Cited by 16 publications

References 68 publications

Cetaceans along the southeastern Brazilian coast: occurrence, distribution and niche inference at local scale

Cetaceans along the southeastern Brazilian coast: occurrence, distribution and niche inference at local scale

Occurrence of Guiana dolphin (Sotalia guianensis) in southeast of Brazil: Driven by prey distribution or human fishing activity?

Modelling habitat use by the Guiana dolphin, Sotalia guianensis, in south‐eastern Brazil: Effects of environmental and anthropogenic variables, and the adequacy of current management measures

Contact Info

Product

Resources

About