Behavior and Ecology of Endangered Species Living Together: Long-Term Monitoring of Resident Sympatric Dolphin Populations

Cremer, Marta Jussara; Holz, Annelise C.; Sartori, Camila M.; Schulze, Beatriz; Paitach, Renan Lopes; Simões‐Lopes, Paulo C.

doi:10.1007/978-3-319-56985-7_17

Cited by 13 publications

(35 citation statements)

References 74 publications

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“…By comparing broadscale models (i.e., western Pilbara region) for humpback and bottlenose dolphins, we may have been able to recognise distribution patterns not evident at a narrower spatial extent. Resource partitioning, where species live in sympatry by taking advantage of different niches to reduce competitive pressure, has been widely observed amongst dolphins (Bearzi, 2005;Parra, 2006;Kiszka et al, 2011;Fernández et al, 2013;Heithaus et al, 2013;Cremer et al, 2018). As top-order predators, co-existence of sympatric dolphin species is likely to be enabled by spatial-temporal differences in prey preferences, diet composition and foraging strategies (Berta et al, 2015).…”

Section: Niche Partitioning Between Humpback and Bottlenose Dolphinsmentioning

confidence: 99%

Dolphin Distribution and Habitat Suitability in North Western Australia: Applications and Implications of a Broad-Scale, Non-targeted Dataset

et al. 2022

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Understanding species’ distribution patterns and the environmental and ecological interactions that drive them is fundamental for biodiversity conservation. Data deficiency exists in areas that are difficult to access, or where resources are limited. We use a broad-scale, non-targeted dataset to describe dolphin distribution and habitat suitability in remote north Western Australia, where there is a paucity of data to adequately inform species management. From 1,169 opportunistic dolphin sightings obtained from 10 dugong aerial surveys conducted over a four-year period, there were 661 Indo-Pacific bottlenose dolphin (Tursiops aduncus), 191 Australian humpback dolphin (Sousa sahulensis), nine Australian snubfin dolphin (Orcaella heinsohni), 16 Stenella sp., one killer whale (Orcinus orca), one false killer whale (Pseudorca crassidens), and 290 unidentified dolphin species sightings. Maximum Entropy (MaxEnt) habitat suitability models identified shallow intertidal areas around mainland coast, islands and shoals as important areas for humpback dolphins. In contrast, bottlenose dolphins are more likely to occur further offshore and at greater depths, suggesting niche partitioning between these two sympatric species. Bottlenose dolphin response to sea surface temperature is markedly different between seasons (positive in May; negative in October) and probably influenced by the Leeuwin Current, a prominent oceanographic feature. Our findings support broad marine spatial planning, impact assessment and the design of future surveys, which would benefit from the collection of high-resolution digital images for species identification verification. A substantial proportion of data were removed due to uncertainties resulting from non-targeted observations and this is likely to have reduced model performance. We highlight the importance of considering climatic and seasonal fluctuations in interpreting distribution patterns and species interactions in assuming habitat suitability.

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Section: Niche Partitioning Between Humpback and Bottlenose Dolphinsmentioning

confidence: 99%

Dolphin Distribution and Habitat Suitability in North Western Australia: Applications and Implications of a Broad-Scale, Non-targeted Dataset

et al. 2022

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“…The bay connects to the ocean through a deep channel, up to 28 m deep. Most of the bay has an average depth of 6 m. The tidal amplitude in this area reaches up to 2.1 m. In the innermost areas of the bay there are large tidal flats, used extensively by franciscanas (Cremer et al, 2018). Artisanal fishing is a very important activity in this area, with more than 12 communities involved (Serafini et al, 2012).…”

Section: Methodsmentioning

confidence: 99%

“…The bay has two harbors for large, ocean‐going vessels, located in the main channel, and the innermost area of the bay has been proposed for harbor expansion (Herbst et al, 2020). A resident population of franciscanas has been monitored in this area since 2000 (Cremer et al, 2018; Sartori et al, 2017).…”

Section: Methodsmentioning

confidence: 99%

Tagging, ranging patterns, and behavior of franciscana dolphins (Pontoporia blainvillei) off Argentina and Brazil: Considerations for conservation

Wells

Cremer

Berninsone

et al. 2021

Marine Mammal Science

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The franciscana dolphin, Pontoporia blainvillei, is one of the most threatened cetaceans in the Southwestern Atlantic. Within their limited coastal range off Argentina, Uruguay, and Brazil, franciscanas face human activities, including artisanal gillnet fishing and coastal development. A lack of information on ranging patterns, population structure, and behavior for informing management led to efforts to develop and apply approaches to tag franciscanas in Argentina (Bahía Samborombón [BS], Bahía San Blas [BSB]) and Brazil (Baía Babitonga [BB]) during 2005–2013. Findings from VHF tags deployed in BS in 2005 during feasibility tests for catching and handling franciscanas for tagging suggested residency over periods of weeks. Subsequently, satellite‐linked tags confirmed patterns of residency at each site. Home range size varied, with ranges of 5–7 km2 for BB, 51–312 km2 for BS, and 49–1,014 km2 for BSB. Diving patterns varied across sites, with the animals using the entire water column, exposing them to fishing nets regardless of the depth at which the nets were set. Tracking durations and follow‐up observations indicated that this research approach is useful for studies of franciscanas. Small, definable ranges facilitate relating specific geographically based threats to appropriate population units, increasing the potential for effective conservation.

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“…The Guiana and bottlenose dolphins are grouped within the more diverse delphinid family characterized by blunt heads, wider jaws, and a lower number of robust and conical teeth (up to 100) in comparison to river dolphins (Werth, 2006). These three species also have different body dimensions (Botta, Muelbert, & Secchi, 2012; Cremer et al , 2018; Rosas & Monteiro‐Filho, 2002; Venuto, Botta, Barreto, Secchi, & Fruet, 2020) and life history traits (i.e., growth rates and age at maturity; Barreto & Rosas, 2006; Botta et al, 2010; Fruet, Daura‐Jorge, Möller, Genoves, & Secchi, 2015; Rosas & Monteiro‐Filho, 2002; Venuto et al, 2020) that likely result in contrasting energetic demands, which in turn can affect their behavior and ability to catch prey, and by extension their dietary preferences.…”

Section: Introductionmentioning

confidence: 99%

Niche overlap and diet composition of three sympatric coastal dolphin species in the southwest Atlantic Ocean

Teixeira

Botta

Daura‐Jorge

et al. 2020

Marine Mammal Science

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Behavior and Ecology of Endangered Species Living Together: Long-Term Monitoring of Resident Sympatric Dolphin Populations

Cited by 13 publications

References 74 publications

Dolphin Distribution and Habitat Suitability in North Western Australia: Applications and Implications of a Broad-Scale, Non-targeted Dataset

Dolphin Distribution and Habitat Suitability in North Western Australia: Applications and Implications of a Broad-Scale, Non-targeted Dataset

Tagging, ranging patterns, and behavior of franciscana dolphins (Pontoporia blainvillei) off Argentina and Brazil: Considerations for conservation

Niche overlap and diet composition of three sympatric coastal dolphin species in the southwest Atlantic Ocean

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