West Africa’s Atlantic humpback dolphin (<i>Sousa teuszii</i>): endemic, enigmatic and soon Endangered?

Weir, Caroline R.; Waerebeek, Koen Van; Jefferson, Thomas A.; Collins, Tim

doi:10.1080/15627020.2011.11407473

Cited by 10 publications

(17 citation statements)

References 2 publications

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“…Low abundance underscores the legitimacy of concern about long-term conservation of Cameroon dolphins. A similar situation was reported in Angola's Namibe province, where only 10 individuals were photo-identified despite extensive field effort [12,25].…”

Section: Discussionsupporting

confidence: 68%

“…Finally, in 1943, a specimen was captured in a shark net off M'Bour, Senegal [9], while the first live individual was retrieved from a beach seine at Joal in 1956 [10]. Further S. teuszii records followed in western Africa, ranging from Dakhla Bay, Western Sahara, south to Angola [2,11,12]. As the species, after its discovery, was not reported again from Cameroon between 1892 and 2011, its historical link with the country faded and the species became known as the Atlantic humpback dolphin [6,8].…”

Section: Introductionmentioning

confidence: 99%

“…An exhaustive review of the biology of S. teuszii [11,12] proposed eight preliminary stocks based largely on distributional grounds, amongst which the "Cameroon Estuary Stock" of unknown status because supported only by the holotype skull [1]. The lack of dedicated survey effort was assumed to be the main reason for the absence of later records in Cameroon.…”

Section: Introductionmentioning

confidence: 99%

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Rediscovery of Cameroon Dolphin, the Gulf of Guinea Population of Sousa teuszii (Kükenthal, 1892)

2014

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Since the 1892 discovery of the Atlantic humpback dolphin Sousa teuszii (Delphinidae), a species endemic to coastal western Africa, from a skull collected in Cameroon, not a single record has been documented from the country or neighbouring countries. Increasing concern about the continued existence of the Gulf of Guinea population of S. teuszii or “Cameroon dolphin” prompted an exploratory survey in May 2011. Shore-based effort, on foot (30.52 km; 784 min), yielded no observations. Small boat-based surveys (259.1 km; 1008 min) resulted in a single documented sighting of ca. 10 (8–12) Cameroon dolphins in shallow water off an open sandy shore near Bouandjo in Cameroon's South Region. The combination of a low encounter rate of 3.86 individuals (100 km)−1 suggesting low abundance and evidence of both fisheries-caused mortality and of habitat encroachment raises concerns about the Cameroon dolphin's long-term conservation prospect. Our results add to indications concerning several other S. teuszii populations that the IUCN status designation of the species as “Vulnerable” may understate its threat level.

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Section: Discussionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rediscovery of Cameroon Dolphin, the Gulf of Guinea Population of Sousa teuszii (Kükenthal, 1892)

2014

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“…Fisheries bycatch is a product of susceptibility (driven by the distribution, type, and magnitude of fisheries effort) and vulnerability (based on ecological characteristics of the bycaught species; e.g., life history and species distribution) (10). For some depleted species, such as Pacific leatherback turtle (Dermochelys coriacea), Amsterdam Albatross (Diomedea amsterdamensis), vaquita (Phocoena sinus), Atlantic humpbacked dolphin (Sousa teuszii), and Australian and New Zealand sea lion (Neophoca cinerea and Phocarctos hookeri), fisheries bycatch has been identified as the single largest threat to extant populations (7,(11)(12)(13)(14)(15).…”

mentioning

confidence: 99%

Global patterns of marine mammal, seabird, and sea turtle bycatch reveal taxa-specific and cumulative megafauna hotspots

Lewison

Crowder

Wallace³

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

393

313

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Recent research on ocean health has found large predator abundance to be a key element of ocean condition. Fisheries can impact large predator abundance directly through targeted capture and indirectly through incidental capture of nontarget species or bycatch. However, measures of the global nature of bycatch are lacking for air-breathing megafauna. We fill this knowledge gap and present a synoptic global assessment of the distribution and intensity of bycatch of seabirds, marine mammals, and sea turtles based on empirical data from the three most commonly used types of fishing gears worldwide. We identify taxa-specific hotspots of bycatch intensity and find evidence of cumulative impacts across fishing fleets and gears. This global map of bycatch illustrates where data are particularly scarce-in coastal and small-scale fisheries and ocean regions that support developed industrial fisheries and millions of small-scale fishers-and identifies fishing areas where, given the evidence of cumulative hotspots across gear and taxa, traditional species or gear-specific bycatch management and mitigation efforts may be necessary but not sufficient. Given the global distribution of bycatch and the mitigation success achieved by some fleets, the reduction of air-breathing megafauna bycatch is both an urgent and achievable conservation priority.fisheries bycatch | trophic downgrading | longlines | gillnets | trawls

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“…Endemic species are often characterized by a low abundance (Weir et al, 2011;Baker et al, 2013), making them susceptible to genetic drift which causes decreased in genetic diversity. In contrast, our research found that the introduced P. kauderni population in Gilimanuk Bay had high haplotype (Hd > 0.5) and low nucleotide (π < 5%) diversity.…”

Section: Genetic Diversitymentioning

confidence: 99%

Spread beyond the border: Small Scale genetic structure of the introduced Banggai cardinalfish (Pterapogon kauderni) population in the Bali Strait

2021

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The living marine aquarium trade has been known to mediate various aquatic invaders to spread and established a new population outside of their natural home range. In most cases, the introduce species cause a cascaded effect which harm the native species and their ecosystem. The successful of the invasion event often related to the genetic properties of the introduced species. Therefore, using a molecular approach based on a mitochondrial DNA marker, the present work aimed to evaluate the population genetic structure of the introduced P. kauderni population in Bali Strait. Samples were collected from four sites in Gilimanuk Bay, Bali Strait. Our results showed a high haplotype diversity and low nucleotide diversity that might be a signal of a bottleneck. Overall, we found five haplotypes comprising two unique haplotypes and three shared haplotypes. Genetic structure was detected in some localities, which indicates Pterapogon kauderni might originated from various genetically distinct populations. However, we could not conclusively determine the observed patterns of the genetic structure within each site. These patterns are likely related to the multiple introduction event of P. kauderni in Bali Strait. Additional samples from both side (introduced and native habitat) combined with more rapidly evolving markers may describe the structure more clearly.

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West Africa’s Atlantic humpback dolphin (Sousa teuszii): endemic, enigmatic and soon Endangered?

Cited by 10 publications

References 2 publications

Rediscovery of Cameroon Dolphin, the Gulf of Guinea Population of Sousa teuszii (Kükenthal, 1892)

Rediscovery of Cameroon Dolphin, the Gulf of Guinea Population of Sousa teuszii (Kükenthal, 1892)

Global patterns of marine mammal, seabird, and sea turtle bycatch reveal taxa-specific and cumulative megafauna hotspots

Spread beyond the border: Small Scale genetic structure of the introduced Banggai cardinalfish (Pterapogon kauderni) population in the Bali Strait

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