Citizen science contributes to the understanding of the occurrence and distribution of cetaceans in southeastern Brazil – A case study

Lodi, Liliane; Tardin, Rodrigo H.

doi:10.1016/j.ocecoaman.2018.03.029

Cited by 35 publications

(14 citation statements)

References 45 publications

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“…Sentinel monitoring could be funded from alternate sources (eg non‐governmental organizations, private trusts, citizen science) to assist ecosystem monitoring in countries, regions, or communities that may not have the resources to self‐fund holistic sampling programs (Lodi and Tardin ). Many existing (WebTable 1) and potential ecosystem sentinels can serve to leverage support for biodiversity conservation by capturing the public's interest (Friedrich et al .…”

Section: Discussionmentioning

confidence: 99%

Marine top predators as climate and ecosystem sentinels

Hazen

Abrahms

Brodie

et al. 2019

Frontiers in Ecol & Environ

226

148

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The rapid pace of environmental change in the Anthropocene necessitates the development of a new suite of tools for measuring ecosystem dynamics. Sentinel species can provide insight into ecosystem function, identify hidden risks to human health, and predict future change. As sentinels, marine apex (top) predators offer a unique perspective into ocean processes, given that they can move across ocean basins and amplify trophic information across multiple spatiotemporal scales. Because use of the terms “ecosystem sentinel” and “climate sentinel” has proliferated in the scientific literature, there is a need to identify the properties that make marine predators effective sentinels. We provide a clear definition of the term “sentinel”, review the attributes of species identified as sentinels, and describe how a suite of such sentinels could strengthen our understanding and management of marine ecosystems. We contend that the use of marine predators as ecosystem sentinels will enable rapid response and adaptation to ecosystem variability and change.

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Section: Discussionmentioning

confidence: 99%

Marine top predators as climate and ecosystem sentinels

Hazen

Abrahms

Brodie

et al. 2019

Frontiers in Ecol & Environ

226

148

View full text Add to dashboard Cite

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“…For instance, non-expert "citizen scientists" now make substantial and active contributions to species mapping by logging ad hoc observations of wildlife using smartphones or other mobile computing technologies (Devictor et al, 2010;Tiago et al, 2017). These can be particularly valuable in biogeographical studies of coastal cetaceans, and can complement or even replace dedicated surveys for tracking distributional changes over broad spatial extents (Embling et al, 2015;Lodi and Tardin, 2018;Alessi et al, 2019). Similarly, community-based approaches that harness the skills, interests, and capacity of Indigenous Ranger organizations are supporting conservation efforts locally, including the monitoring of trends in species and habitats (Grech et al, 2014;Jackson et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Regional Assessment of the Conservation Status of Snubfin Dolphins (Orcaella heinsohni) in the Kimberley Region, Western Australia

Bouchet

Thiele

Marley³

et al. 2021

Front. Mar. Sci.

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Implementing conservation measures for data-limited species is a fundamental challenge for wildlife managers and policy-makers, and proves difficult for cryptic marine animals occurring in naturally low numbers across remote seascapes. There is currently scant information on the abundance and habitat preferences of Australian snubfin dolphins (Orcaella heinsohni) throughout much of their geographical range, and especially within the Kimberley region of northern Western Australia. Such knowledge gaps curtail rigorous threat assessments on both local and regional scales. To address this and assist future conservation listings, we built the first comprehensive catalog of snubfin dolphin sightings for the Kimberley. We used these data to estimate the species’ extent of occurrence (EOO) and area of occupancy (AOO) along the region’s 7,000 km coastline, following a simple Bootstrap bivariate kernel approach to combine datasets of varying quality and quantify uncertainty. Our catalog consists of 1,597 visual detections of snubfin dolphins made over a period of 17 years (2004–2020) and collated from multiple sources, including online biodiversity repositories, peer-reviewed scientific articles, citizen science programs, as well as dedicated marine wildlife surveys with local Indigenous communities and Ranger groups. Snubfin dolphins were consistently encountered in shallow waters (<21 m depth) close to (<15 km) freshwater inputs, with high detection rates in known hotspots (e.g., Roebuck Bay, Cygnet Bay) as well as in coastal habitats suspected to be suitable (e.g., Prince Regent River and surrounds, King Sound, Doubtful Bay, Napier Broome Bay and the upper Cambridge Gulf). Bootstrap estimates of EOO and AOO were 38,300 (95% CI: 25,451–42,437) km2 and 700 (656–736) km2 respectively, suggesting that snubfin dolphins in the Kimberley are likely Vulnerable under IUCN criteria B2 at a regional scale, in keeping with their global classification. Our study offers insights into the distribution of a vulnerable coastal cetacean species and demonstrates the value of integrating multiple data sources for informing conservation assessments in the face of uncertainty.

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“…In Rio de Janeiro, south-eastern Brazil, the rough-toothed dolphin occurs closer to the coast. They are most commonly found at depths of 5–20 m (Lodi & Tardin, 2018).…”

Section: Introductionmentioning

confidence: 99%

Rough-toothed dolphins (Cetartiodactyla: Delphinidae) habitat use in coastal urban waters of the South-western Atlantic

Lodi¹,

Maricato

2020

J. Mar. Biol. Ass.

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Rough-toothed dolphins (Steno bredanensis) are regularly present in continental shelf areas of the South-western Atlantic. However, there is little information on the natural history and ecology of these delphinids. This study evaluated the occurrence, habitat use and individual movements of the species in coastal waters off Rio de Janeiro, south-eastern Brazil. Data were obtained from boat surveys between August 2011 and May 2018, during which rough-toothed dolphins were sighted in 21 distinct events, predominantly in autumn and winter. The mean group size was 29 individuals. Rough-toothed dolphins were usually recorded 130 to 2300 m from the coast, between 7.6 and 28 m depths. In total, 115 individuals were catalogued through dorsal fin marks and 61 (53%) were resighted between one (47.5%) and four (9.8%) occasions. The interval between resightings ranged from seven to 2087 days (mean = 268). Agglomerative hierarchical clustering indicated 30 individuals (49.2%) in low degree, 12 (19.7%) in medium degree and 19 (31.1%) in high degree of site fidelity. Dolphins showed a higher frequency of low degree of habitat use, despite the presence of multiyear recaptures, which may be related to the prevalence of dolphin occurrence in autumn and winter, a large home range and/or the abundance and distribution of food resources. Dedicated surveys and regional collaboration are needed to evaluate the home range and population status of this species for their effective conservation. Our findings enhanced knowledge of this little studied species facing increasing anthropogenic threats in coastal waters off Rio de Janeiro.

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Citizen science contributes to the understanding of the occurrence and distribution of cetaceans in southeastern Brazil – A case study

Cited by 35 publications

References 45 publications

Marine top predators as climate and ecosystem sentinels

Marine top predators as climate and ecosystem sentinels

Regional Assessment of the Conservation Status of Snubfin Dolphins (Orcaella heinsohni) in the Kimberley Region, Western Australia

Rough-toothed dolphins (Cetartiodactyla: Delphinidae) habitat use in coastal urban waters of the South-western Atlantic

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