Sea Turtle, Shark, and Dolphin Bycatch Rates by Artisanal and Semi-Industrial Fishers in Maio Island, Cape Verde

Lopes, Kátia Gianlupi; Passos, Leno Dos; Rodrigues, João Garcia; Koenen, Franziska; Stiebens, Victor A.; Székely, Tamás; Dutra, Amanda

doi:10.2744/cb-1213.1

Cited by 12 publications

(11 citation statements)

References 22 publications

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“…Additionally, the rate of dolphin by-catch in the poleand-line tuna (Thunnini tribe) fishery in the Azores has varied considerably between years, and while dolphins caught were reported to be released alive, the fate of these released individuals is unknown (Cruz et al 2018). Dolphin by-catch by artisanal fishers has also been documented in Cape Verde (Lopes et al 2016). Despite the urgency in conserving these habitats and animals, information on various aspects of cetacean ecology and biology is scarce and scattered across the region (Correia et al 2015.…”

Section: Introductionmentioning

confidence: 99%

Trends in cetacean research in the Eastern North Atlantic

et al. 2021

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1. Cetaceans are considered ecosystem engineers and useful bioindicators of the health of marine environments. The Eastern North Atlantic is an area of great geographical and oceanographic complexity that favours ecosystem richness and, consequently, cetacean occurrence. Although this occurrence has led to relevant scientific research on this taxon, information on the composition of this research has not been assessed. 2. We aimed to describe and quantify the evolution of research on cetaceans in the Eastern North Atlantic, highlighting the main focal areas and trends. 3. We considered 380 peer-reviewed publications between 1900 and 2018. For each paper, we collected publication year, research topics and regions, and species studied. We assessed differences among regions with distinct socioeconomic landscapes, and between coastal and oceanic habitats. To evaluate the changes in scientific production over time, we fitted a General Additive Model to the time series of numbers of papers. 4. Although research in this region has been increasing, the results show relatively little research output in North African and coastal regions within the study area. Moreover, except for four studies, research was restricted to a few miles around the coast of the main islands, leaving offshore regions less well surveyed. There was little research on genetics, acoustics, and behaviour. Most papers were focused on the Azores and Canary Islands, and mostly involved Tursiops truncatus, Delphinus delphis, and Physeter macrocephalus. Species considered Endangered or Near Threatened were the subjects of only 10% of the studies. 5. We suggest a greater research focus on beaked whales (Ziphiidae) in Macaronesia, as well as collaborative efforts between research teams in the region, by sharing data sets, and aiming to produce long-term research. Moreover, a Delphi method approach, based on questionnaires answered by experts, could be attempted to identify priority research for cetaceans in these areas.

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Section: Introductionmentioning

confidence: 99%

Trends in cetacean research in the Eastern North Atlantic

et al. 2021

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“…Despite being an epibenthic and demersal species, majorly living on continental shelfs, adults have been also observed, on a few occasions, swimming in the water column (Compagno, 1984). This capacity may explain the colonization of oceanic archipelagos in the eastern Atlantic not far away from the African continent, for example, the Canary Islands, São Tomé and Príncipe, and Cape Verde Islands, where M. mustelus is one of the most frequently captured shark species (González, Monteiro, et al, 2020; Lopes et al, 2016; Mendoza et al, 2018). In Madeira archipelago, the smooth‐hound shark is seen around the islands all year round (Biscoito et al, 2018; Martínez‐Escauriaza et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Distribution and population structure of the smooth‐hound shark, Mustelus mustelus (Linnaeus, 1758), across an oceanic archipelago: Combining several data sources to promote conservation

Espino

González

Bosch

et al. 2022

Ecology and Evolution

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Sharks play a key role in the structure and functioning of marine ecosystems. More ecological information is essential to implement responsible management and conservation actions on this fauna, particularly at a regional level for threatened species. Mustelus mustelus is widely found in the eastern Atlantic Ocean and catalogued as “Vulnerable” by the IUCN European assessment. In this study, data on the distribution and population structure of this species across the islands of the Canarian archipelago, located along an east to west gradient in the north‐eastern Atlantic, were collected by taking advantage of “Local Ecological Knowledge,” in terms of sightings in coastal waters and long‐term imprints on the local gastronomic heritage, and decadal fisheries landings. Both sources of quantitative data (sightings and fisheries landings) demonstrated that adults of M. mustelus has a significantly larger presence in the eastern and central, than in the western islands of the archipelago. This is also reflected on local gastronomic legacies, with a larger number of recipes in the eastern and central islands. Adult smooth‐hound sharks were significantly more observed in sandy and sandy‐rocky bottoms, with individuals seen throughout the entire year, whereas juveniles aggregate on very shallow waters in spring and summer. Such aggregations require a special management strategy, as they play a key role in critical life stages; these sites should be protected from human perturbations. We also suggest a temporal fishing ban between April and October, when individuals tend to concentrate on nearshore waters. Because of the large differences in presence of this shark among the Canary Islands, management of the species should be adapted to the specific peculiarities of each island, rather than adopting a management policy at the entire archipelago‐scale. Overall, this study sets the basis for further investigation to promote conservation of this vulnerable shark in the study region.

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“…Data on marine mammal space use and behavioral observations, in the context of fishery operations, are being used for spatial risk assessments, understanding the drivers of bycatch, and assessing the effectiveness of implemented management measures (Grech et al, 2008;Marsh et al, 2011;Cerutti-Pereyra et al, 2020). Studies on acoustic activity and behavior of marine mammals have also assisted in understanding the precursors and the intensities of these interactions (Iriarte and Marmontel, 2013;Lewison et al, 2014;Kindt-Larsen et al, 2016;Lopes et al, 2016;Clay et al, 2019). Over the past decade, researchers have stressed the importance of ecological studies to understand the underlying causes of bycatch (Northridge et al, 2017).…”

Section: Challenges Uncertainties and Opportunities For Management Ac...mentioning

confidence: 99%

Marine Mammal Interactions With Fisheries: Review of Research and Management Trends Across Commercial and Small-Scale Fisheries

et al. 2022

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Marine mammal interactions with fisheries, such as bycatch and depredation, are a common occurrence across commercial and small-scale fisheries. We conducted a systematic review to assess the management responses to marine mammal interactions with fisheries. We analyzed literature between 1995 and 2021 to measure research trends in studies on direct and indirect interactions for: (i) high and low to middle-income countries, (ii) fishery operations (commercial and small-scale), and (iii) taxonomic groups. Management responses were categorized using the framework described previously in peer-reviewed studies. Marine mammal bycatch remains a major conservation concern, followed by marine mammal depredation of fishing gear. A high proportion of studies concentrated on commercial fisheries in high-income countries, with an increase in small-scale fisheries in low to middle-income countries between 1999 and 2020. The insufficient understanding of the social dimensions of interactions and the inevitable uncertainties concerning animal and human behaviors are major challenges to effective management. Despite the key role of human behavior and socioeconomics, we found only eight articles that incorporate human dimensions in the management context. Integrating social dimensions of marine mammal interactions with fisheries could help in setting pragmatic conservation priorities based on enhanced understanding of critical knowledge gaps. An area-specific adaptive management framework could be an effective tool in reducing the risk to marine mammals from fisheries by coupling technical solutions with socio-economic and political interventions. We conclude that despite the vast body of literature on this subject, a “silver bullet” management solution to marine mammal interactions with fisheries does not yet exist.

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Sea Turtle, Shark, and Dolphin Bycatch Rates by Artisanal and Semi-Industrial Fishers in Maio Island, Cape Verde

Cited by 12 publications

References 22 publications

Trends in cetacean research in the Eastern North Atlantic

Trends in cetacean research in the Eastern North Atlantic

Distribution and population structure of the smooth‐hound shark, Mustelus mustelus (Linnaeus, 1758), across an oceanic archipelago: Combining several data sources to promote conservation

Marine Mammal Interactions With Fisheries: Review of Research and Management Trends Across Commercial and Small-Scale Fisheries

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