Feeding grounds of the western South Atlantic humpback whale population

Engel, Márcia H.; Martin, Anthony R.

doi:10.1111/j.1748-7692.2009.00301.x

Cited by 40 publications

(37 citation statements)

References 14 publications

(17 reference statements)

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“…This included results from experimental fisheries surveys, underwater visual surveys and other published literature describing the biodiversity within the Azores EEZ. The results were compared with the FAO Fisheries Catalogue for the region (Ebert and Stehmann, 2013) as a measure of global knowledge about the region. Clarifications regarding taxonomy and species occurrence were sought from local experts where necessary.…”

Section: Checklistmentioning

confidence: 99%

“…(Floeter et al, 2008) and owing to the few highlymigratory species shared between these sections of the North Atlantic. Species lists of the other regions were adapted from regional annotated checklists (Brito et al, 2002;Wirtz et al, 2008;Wirtz, 2011) and recently published literature [Freitas and Biscoito, 2007;Ferreira et al, 2008;Freitas et al, 2011;Kyne et al, 2012 (only species from NWA); Ebert and Stehmann, 2013;Delgado et al, 2017], augmented by local expert knowledge where possible (P. Pascual IEO/Canaries, pers. comm.…”

Section: Note On Systematic Arrangementmentioning

confidence: 99%

“…Frequency of occurrence: Green (common) Record for Azores in FAO Fish Finder (Ebert and Stehmann, 2013): No Depth range (Ebert and Stehmann, 2013): 560-2,060 m Local gear susceptibility: Bottom trawls Local primary literature where species appears: Appears as A. maderensis or A. laurussonii (Saldanha and Biscoito, 1997;Melo and Menezes, 2002;Menezes et al, 2012).…”

Section: Pentanchidaementioning

confidence: 99%

“…Frequency of occurrence: Yellow (rare) Record for Azores in FAO Fish Finder (Ebert and Stehmann, 2013): Possible Depth range (Ebert and Stehmann, 2013): 120-240 m Local gear susceptibility: Pelagic longlines Local primary literature where species appears: (Martins, 2013).…”

Section: Isurus Paucus Guitart 1966mentioning

confidence: 99%

“…Record for Azores in FAO Fish Finder (Ebert and Stehmann, 2013): No (for D. centroura) (NB: No records of either B. lata or B. centroura from the region in Last P. et al, 2016) Depth range (Ebert and Stehmann, 2013) …”

Section: Dasyatidaementioning

confidence: 99%

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Review of the Diversity, Ecology, and Conservation of Elasmobranchs in the Azores Region, Mid-North Atlantic

Das

Afonso

2017

Front. Mar. Sci.

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A vulnerable species group, such as, the elasmobranchs, in a data-deficient context presents a complicated management problem. Evidence suggests that the Azores islands, a remote archipelago on the Mid-Atlantic Ridge, serve essential functions in the life-history of species across taxa. The diversity of marine resources within its EEZ are exploited by local to international fleets, and the full extent of fishing pressure can often be underestimated. Although sharks and rays appear to be of minor importance in the fishery, the possibilities of illegal, unreported, and unregulated fishing raises concerns about these threatened species. However, this group has failed to attract management attention, visible in the lack of regional studies focused on biodiversity, ecology, or threats of elasmobranchs. Our work attempts to review and update the information on elasmobranchs of the Azores and identify potential threats, mainly by the local fisheries. We aim to highlight knowledge gaps that require further research and conservation actions. We (1) update the annotated checklist of elasmobranch species, (2) compare species distribution across a biogeographically similar section of the North Atlantic, and (3) analyze the interaction of elasmobranch species with local fisheries. We confirm 61 chondrichthyan species for the Azores (39 sharks, 17 rays, and 5 chimaeras), adding 19 species to the previous annotated checklist of 1997. The Azores elasmobranch species assemblage most resembles Madeira, the neighboring Macaronesian archipelago. Biogeographic affinities between the chosen regions of the North Atlantic are reflected in the taxonomic structure of families. Although underestimated in the local fisheries, elasmobranchs constitute a regular but highly variable portion of total landings. Misreporting and misidentification is perhaps the greatest concern in the local fisheries records, further aggravated by few existing catch regulations for elasmobranchs. Local knowledge indicates that the Azores serves as essential habitat for at least a few species in coastal areas and shallow seamounts, and potentially so for a number of deep-sea elasmobranchs. The intersection of fishery threats and local essential habitat functions around the archipelago warrants greater research effort and studies.

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Section: Checklistmentioning

confidence: 99%

Section: Note On Systematic Arrangementmentioning

confidence: 99%

Section: Pentanchidaementioning

confidence: 99%

Section: Isurus Paucus Guitart 1966mentioning

confidence: 99%

Section: Dasyatidaementioning

confidence: 99%

See 3 more Smart Citations

Review of the Diversity, Ecology, and Conservation of Elasmobranchs in the Azores Region, Mid-North Atlantic

Das

Afonso

2017

Front. Mar. Sci.

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Temporal stability and mixed-stock analyses of humpback whales (Megaptera novaeangliae) in the nearshore waters of the Western Antarctic Peninsula

et al. 2017

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Distribution, hosts and long-term decline in abundance of the Patagonian lamprey inferred from diet assessment of albatrosses

Phillips

Waluda

Miller

2023

Rev Fish Biol Fisheries

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Knowledge of lampreys during their marine phase is limited, and for the southern hemisphere species was gleaned from their predators (albatrosses) in the 1970s. Taking advantage of new methodologies and long-term data on predator diet and distributions, we infer diverse aspects of lamprey distribution and ecology. DNA analyses indicated that albatrosses at South Georgia prey on Patagonian lamprey Geotria macrostoma, originating from Argentina. Their core pelagic distribution when free swimming appears to be the Antarctic Polar Frontal zone (APFZ), and not South Georgia waters as assumed previously. If so, the APFZ would be the first known hotspot in abundance of an anadromous lamprey in oceanic waters. We could not identify a teleost fish that would be a likely host. Instead, we infer that the lamprey may prey on baleen whales, based on comparison of stable isotope ratios in lamprey with candidate host species, timing of appearance in albatross diets coincident with whale migrations, and circumstantial evidence (unexplained scarring recorded during the whaling era). We suggest that the lamprey do not tolerate cold Antarctic waters, and detach from southerly-migrating whales at the thermal boundary of the APFZ, where they become accessible to albatrosses in surface waters. Given strong evidence that relative importance of prey in seabird diets reflects availability in foraging areas, the steep decrease in the annual consumption of lamprey by albatrosses at South Georgia from > 550 tonnes in 1975–1976 and 1986, to very low levels in most years since 2012, is likely to indicate a major population decrease. Despite our unconventional means of assessing the population trend, there is a compelling case for listing of Patagonian lamprey at least as Near threatened by the International Union for the Conservation of Nature, and an urgent need to better understand anthropogenic threats in Argentina.

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Feeding grounds of the western South Atlantic humpback whale population

Cited by 40 publications

References 14 publications

Review of the Diversity, Ecology, and Conservation of Elasmobranchs in the Azores Region, Mid-North Atlantic

Review of the Diversity, Ecology, and Conservation of Elasmobranchs in the Azores Region, Mid-North Atlantic

Temporal stability and mixed-stock analyses of humpback whales (Megaptera novaeangliae) in the nearshore waters of the Western Antarctic Peninsula

Distribution, hosts and long-term decline in abundance of the Patagonian lamprey inferred from diet assessment of albatrosses

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