Fine-scale genetic structure in Lahille’s bottlenose dolphins (Tursiops truncatus gephyreus) is associated with social structure and feeding ecology

Genoves, Rodrigo Cézar; Fruet, Pedro F.; Botta, Silvina; Beheregaray, Luciano B.; Möller, Luciana M.; Secchi, Eduardo R.

doi:10.1007/s00227-019-3638-6

Cited by 17 publications

(11 citation statements)

References 88 publications

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“…Any dolphin found dead along the open coast near the PLE was assumed to belong to the PLE's dolphin population (Fruet et al, 2012). Although reasonable based on knowledge at that time, we now know that there are two aditional bottlenose dolphin populations transiting (Genoves et al, 2018(Genoves et al, , 2020, and being captured in fishing nets near this area (Ecomega, unpubl. data).…”

Section: Viability Of the Patos Lagoon Estuary's (Ple) Dolphin Populationmentioning

confidence: 99%

“…data). Hence animals stranded in the open coast area may belong to any of the three dolphin populations (Management Units) (Fruet et al, 2014;Genoves et al, 2018Genoves et al, , 2020. In addition, Potential Biological Removal considers minimum abundance estimates (i.e., the 20th percentile of a log-normal distribution based on the absolute estimate of the number of animals in the population-see Wade, 1998), and that the population cannot grow more than half of the default maximum population growth of 4%, which was suggested for impacted small cetacean species (Reilly and Barlow, 1986).…”

Section: Viability Of the Patos Lagoon Estuary's (Ple) Dolphin Populationmentioning

confidence: 99%

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Dynamics and Viability of a Small, Estuarine-Resident Population of Lahille’s Bottlenose Dolphins From Southern Brazil

2021

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Identifying threatened populations and quantifying their vulnerability is crucial for establishing priorities for conservation and providing robust information for decision-making. Lahille’s bottlenose dolphins have been long subjected to by-catch mortality in gillnet fisheries in coastal waters of southern Brazil, particularly in the Patos Lagoon estuary (PLE) and adjacent coastal waters, where dolphins from three populations (or Management Units) show overlapping home ranges. In this study we used a stage-classified matrix population model to conduct a demographic analysis of the PLE’s population with life-history data estimated through an 8 years mark-recapture study. A population viability analysis (PVA) was used to run a series of simulations where the risk was assessed under different by-catch scenarios, taking into account the effects of parameter uncertainty and stochasticity in the projections. In the absence of by-catch, we estimated that this dolphin population would growth at a rate of about 3% annually (95% CI: 1.2–5.8%). Under current by-catch rates, prognoses indicated high probabilities of viability over the next 60 years. These optimistic prognoses appear to be associated with the high survival of adult females. However, the eventual removal of very few mature females (one every year or two) would result in a prominent likelihood of decline from its current abundance at all pre-specified levels. The viability of the population would be substantially improved if the survival of juveniles/sub-adults could be increased. This may be achieved through the recently implemented dolphin protection area, which prohibits gillnet fisheries in the core area of this population. If the protection area reduces the entanglement rates of the most impacted life-stages (i.e., juvenile/sub-adult dolphins), there would be a substantial chance of the PLE’s dolphin population increasing above 20% of its current size, which is here proposed as conservation goal. If met, this goal has the potential to promote habitat quality, increase genetic diversity and connectivity with adjacent populations, enhancing the ability of bottlenose dolphins in southern Brazil to cope with environmental change and potential disease outbreaks.

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Section: Viability Of the Patos Lagoon Estuary's (Ple) Dolphin Populationmentioning

confidence: 99%

Section: Viability Of the Patos Lagoon Estuary's (Ple) Dolphin Populationmentioning

confidence: 99%

Dynamics and Viability of a Small, Estuarine-Resident Population of Lahille’s Bottlenose Dolphins From Southern Brazil

2021

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“…Ecology of Lahille's bottlenose dolphin Tursiops truncatus gephyreus in the Patos Lagoon estuary and adjacent marine coast (https://doi.org/10.15468/4nh9ng) (Secchi et al, 2020) Tursiops truncatus gephyreus have been systematically and intensively monitored in the PLEA. This long-term surveys allowed estimation of the distribution, abundance, reproductive and survival rates, genetic and social structures, and contamination load as well as detection of temporal and gender-related variation in diet of the Lahille's bottlenose dolphin.…”

Section: VIIImentioning

confidence: 99%

“…The LTER-PLEA's database enabled the comprehension of the magnitude and drivers of short-and long-term changes in the abundance and composition of phytoplankton (Haraguchi et al, 2015), submerged aquatic vegetation (Copertino and Seeliger, 2010;Lanari and Copertino, 2017), benthic macrofauna (Collin et al, 2007(Collin et al, , 2010, micro-and mesozooplankton assemblages (Muxagata et al, 2012;Teixeira-Amaral et al, 2017), the most relevant ichthyoplankton species (Bruno and Muelbert, 2009;Costa et al, 2013), fish fauna (Garcia et al, 2001(Garcia et al, , 2003(Garcia et al, , 2004, pink shrimp, and Lahille's bottlenose dolphin population parameters (Fruet et al, 2011(Fruet et al, , 2015Genoves et al, 2018Genoves et al, , 2020. All this information has enabled the understanding of the dynamics of ichthyoplankton transport and recruitment into the estuary Franzen et al, 2019) and the influence of environmental dynamics on the health of fish larvae (Gouveia et al, 2015;Salvador and Muelbert, 2019); the influence of climatic and local factors on fish abundance, diversity, and trophic organization (Garcia et al, 2003(Garcia et al, , 2012(Garcia et al, , 2017Possamai et al, 2018); the evaluation of the secondary production of copepods and its main contributors (Muxagata et al, 2012;Teixeira-Amaral et al, 2017); occurrence of potentially harmful microalgae groups (e.g., cyanobacteria and dinoflagellates) (Haraguchi et al, 2015); diatom accumulation in surf zone influenced by drastic events like mud deposition freshwater output (Odebrecht et al, 2010(Odebrecht et al, , 2013; phase shifts in the SAV (Copertino and Seeliger, 2010;Lanari and Copertino, 2017); the importance of the main nursery grounds for commercial species…”

Section: Potential Use and Conclusionmentioning

confidence: 99%

Patos Lagoon estuary and adjacent marine coastal biodiversity long-term data

Lemos

Lanari

Copertino

et al. 2022

Earth Syst. Sci. Data

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Abstract. Estuaries are among the most productive aquatic ecosystems and provide important ecological and economic services in coastal areas. However, estuarine systems have been threatened worldwide by natural and anthropogenic impacts acting on local, regional, and global scales. Long-term ecological studies contribute to the understanding and management of estuarine functioning and provide the baseline information for detection changes and modeling of predictive scenarios. Here, we describe long-term data on the biodiversity and physico-chemical parameters obtained from 1993 to 2016 for the Patos Lagoon estuary and adjacent marine coast (PLEA), in southern Brazil. We report 8 datasets containing 6972 sampling events with the occurrence and abundance records of 275 species (kingdoms: Bacteria, Protozoa, Chromista, Plantae, and Animalia) of functional groups plankton, benthos, and nekton. Datasets also include 22 190 abiotic records. The database is published in the Global Biodiversity Information Facility (GBIF) repository (see Sect. 3 “Data availability” and Table 3). The present compendium represents one of the most comprehensive and longest datasets from primary producers to top predators in an estuarine coastal system in South America, and their availability will be an important contribution to the understanding and predictability of estuarine dynamics around the world.

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“…Ecology of Lahille's bottlenose dolphin Tursiops truncatus gephyreus in the Patos Lagoon estuary and adjacent marine coast (https://doi.org/10.15468/4nh9ng) (Secchi et al, 2020) Tursiops truncatus gephyreus have been systematically and intensively monitored in the Patos Lagoon estuary and adjacent marine coast. This long-term surveys allowed estimating on the distribution, abundance, reproductive and survival rates, genetic and social structures, contamination load and detecting temporal and gender-related variation in diet of the Lahille's bottlenose dolphin.…”

Section: VIIImentioning

confidence: 99%

Patos Lagoon Estuary and Adjacent Marine Coastal Biodiversity Long-term data

Lemos

Lanari

Copertino

et al. 2021

Preprint

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Abstract. Estuaries are among the most productive aquatic ecosystems and provide important ecological and economic services in coastal areas. However, estuarine systems have been threatened worldwide by natural and anthropogenic impacts acting on local, regional and global scales. Long-term ecological studies contribute to the understanding and management of estuarine functioning, and provide the baseline information for detection changes and modeling of predictive scenarios. Here, we describe long-term data on the biodiversity and physico-chemical parameters obtained from 1993 to 2016 for the Patos Lagoon estuary and adjacent marine coast, in southern Brazil. We report eight datasets containing 6,972 sampling events with the occurrence and abundance records of 275 species (Kingdoms: Bacteria, Protozoa, Chromista, Plantae and Animalia) of functional groups plankton, benthos and nekton. Datasets also include 22,190 abiotic records. Database is published in the Global Biodiversity Information Facility (GBIF) repository (see Data availability in Sect 3). The present compendium represents one of the most comprehensive and longest datasets from primary producers to top predators in an estuarine-coastal system in South America and their availability will be an important contribution to the understanding and predictability of estuarine dynamics around the world.

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Fine-scale genetic structure in Lahille’s bottlenose dolphins (Tursiops truncatus gephyreus) is associated with social structure and feeding ecology

Cited by 17 publications

References 88 publications

Dynamics and Viability of a Small, Estuarine-Resident Population of Lahille’s Bottlenose Dolphins From Southern Brazil

Dynamics and Viability of a Small, Estuarine-Resident Population of Lahille’s Bottlenose Dolphins From Southern Brazil

Patos Lagoon estuary and adjacent marine coastal biodiversity long-term data

Patos Lagoon Estuary and Adjacent Marine Coastal Biodiversity Long-term data

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