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  • 1
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    How do cephalopods become available to seabirds: can fish gut contents from tuna fishing vessels be a major food source of deep-dwelling cephalopods? (2013)
    Oxford Univ. Press
    In:  ICES Journal of Marine Science, 70 (1). pp. 46-49.
    Details
    Publication Date: 2019-09-23
    Description: Cephalopods are important prey for numerous seabird species. However, the physical mechanisms by which cephalopods (particularly species considered as deep-dwelling) become available to seabirds are poorly understood, and it has recently been suggested that the discarded stomachs of gutted fish captured by tuna longliners can be a major source of deep-dwelling species. Here, we identify some deep-dwelling cephalopods that appear in the diet of seabirds, review the current knowledge of their vertical distribution, and compare the stomach contents of commercially captured tuna with those of seabirds foraging in the same area. The limited available information leads us to conclude that tuna longliners are unlikely to be a major source of deep-dwelling cephalopods for seabirds. However, much more information is required on the ecology of seabird prey, particularly commercially unexploited cephalopod species, which may be obtained from scientific cruises devoted to cephalopod biological research. In addition multispecies/foodweb modelling studies may be required to explore potential interactions between seabirds, their predators and prey, and commercial fishing operations.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1093/icesjms/fss167
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Larval fish abundance, composition and distribution at Senghor Seamount (Cape Verde Islands) (2010)
    Oxford Univ. Press
    In:  Journal of Plankton Research, 32 (11). pp. 1541-1556.
    Details
    Publication Date: 2018-06-06
    Description: The Cape Verdean Senghor-Seamount rises up to 93 m below the surface, and lies within the Cape Verde Frontal Zone (CVFZ), and within the southwestward North Equatorial Current. The seamount and its oceanic surroundings were surveyed with Multiple-Opening-Closing Net (MCN) fish larval catches, Issacs-Kidd midwater trawl (IKMT) micronekton hauls and an analysis of some conductivity–temperature–depth data (RV Poseidon cruise no. POS 320/2). The thermal and saline stratifications showed widely symmetrical uplifts near the summit. The larval fish community was diverse (H′ = 2.656) and composed mainly of larvae of meso- to bathypelagic species (91.5%). In IKMT, 44.1% of the specimens originated from demersal parents (H′ = 3.296), and mostly, albeit not entirely, from West African coastal waters, after advection along the CVFZ to and across this potential “stepping stone”. Gross larval fish abundance (median 35.5 specimens/1 m2) and composition agreed well with historical literature data from adjacent waters and seamounts north of the CVFZ, whereas south of the CVFZ and towards NW-Africa reported abundances were higher. Vertical distributions of larvae which generally live at greater depths showed a rise above the seamount, following the hydrographic uplift, accompanied by “thinning-out effects” through bathymetric disturbance. The extent to which findings at Senghor Seamount are representative for small, shallow and steep seamounts in the tropical NE-Atlantic is discussed.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1093/plankt/fbq076
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic (2011)
    Oxford Univ. Press
    In:  ICES Journal of Marine Science, 68 (2). pp. 377-389.
    Details
    Publication Date: 2019-09-23
    Description: Material collected in summer 2004 from the Mid-Atlantic Ridge between Iceland and the Azores with three pelagic trawls was used to estimate relative catchabilities of common fish, cephalopod, decapod, and jellyfish species. Catchability is defined as the ratio of numbers caught between two trawls, standardized for towed distance. Taxon-specific catchability coefficients were estimated for two large pelagic trawls with graded meshes, using a smaller pelagic trawl with a uniform mesh size as the reference trawl. Two of the trawls were equipped with multiple opening–closing codends that allowed sampling of different depth layers. Generalized linear and mixed models suggest that most of the taxa have catchabilities much lower than expected from the area of opening alone, indicating that only a few species are herded by the large mesh at the mouth of larger trawls. Catchability coefficients across taxa show a very large spread, indicating that the sampled volume for the larger trawls with graded meshes was highly taxon-specific. Part of this variability can be explained by body size and taxonomic group, the latter probably reflecting differences in body form and behaviour. The catchability estimates presented here form the basis for combining data for quantitative analyses of community structure.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1093/icesjms/fsq089
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Distribution of cephalopod paralarvae in relation to the regional oceanography of the western Iberia (2009)
    Oxford Univ. Press
    In:  Journal of Plankton Research, 31 (1). pp. 73-91.
    Details
    Publication Date: 2019-01-22
    Description: The present study analyses the distribution of cephalopod paralarvae off the Portuguese coast. The effects of temporal and physical variables on Loligo vulgaris, Octopus vulgaris, sepiolid and ommastrephid abundances are analysed with generalized linear models. Their distribution patterns are discussed in relation to mesoscale features, including currents, thermal fronts and coastal upwelling cross-shelf transport, prevailing in the western Iberia upwelling system. Paralarvae of the neritic species occur during a considerably extended period of the year with two or three abundance peaks within the highly productive upwelling system of the western Portuguese coast and contrasting with the Gulf of Cadiz area. Temperature and upwelling were shown to be the most important variables in modulating seasonality and distribution of these paralarvae. The influence of the physical environment is particularly pronounced for the paralarvae of O. vulgaris, following distinct patterns according to the oceanography of the western Iberia and the Gulf of Cadiz systems. The paralarvae of oceanic species, which in many cases have their northern limit of distribution at these latitudes, were mainly found in the southern part of the sampling area. The distribution of these species indicates that the prevailing oceanographic features of the Gulf of Cadiz system, especially fronts, together with temperature act as boundaries to geographic dispersal, contributing to an area of high cephalopod biodiversity in the southern Portuguese waters.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1093/plankt/fbn103
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Cephalopod paralarvae and upwelling conditions off Galician waters (NW Spain) (1999)
    Oxford Univ. Press
    In:  Journal of Plankton Research, 21 (1). pp. 21-33.
    Details
    Publication Date: 2021-06-11
    Description: A total of 103 cephalopod paralarvae were sampled during June 1995 in Galician waters (NW Spain). Samples were taken with Bongo nets of 300 and 500 〈IMG SRC="/math/mu.gif"〉m mesh size at 48 sampling stations along 10 transverse transects ranging from 80 to 600 m water depth. Paralarvae of loliginid squid were most abundant (40%). The〈it〉Rhynchoteuthion〈/it〉 paralarvae of ommastrephid squid accounted for 25%, whereas sepiolids comprised 23% of the total sample. Octopods were scarce, at only 6.6%. Other cephalopod families accounted for 5%. Sizes of paralarvae ranged from 1.0 to 7.1 mm mantle length. Temperature and salinity distribution showed the presence of an intense upwelling during the survey period. The sampling data obtained before and during the presence of upwelled water off Rias of Pontevedra and Vigo (southern zone) showed that paralarval cephalopod abundance and distribution were closely related to the upwelled Eastern North-Atlantic Central Water (ENACW).
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1093/plankt/21.1.21
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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