Pelagic squid associationswith a warm-core eddy of the East Australian Current

Brandt, Stephen B.

doi:10.1071/mf9830573

Cited by 15 publications

(4 citation statements)

References 28 publications

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“…Seabirds, as apex consumers in marine food webs, parallel lower trophic levels in their responses to western boundary current processes. The physicalhiological gradients at eddies or rings influence community composition of phytoplankton (Ortner et al 1979, Jeffrey & Hallegraeff 1980, zooplankton (Ortner et al 1978, Tranter et al 1983, cephalopods (Brandt 1983), and midwater fishes (Brandt 1981, Olson & Backus 1985. In the East Australian Current, changes in faunistic composition (Griffiths & Brandt 1983, Tranter et al 1983), abundance (McWilliam & Phillips 1983), and size frequencies (Brandt 1983) were observed at eddies.…”

Section: Resultsmentioning

confidence: 99%

Seabird segregation at Gulf Stream frontal eddies

Haney¹

1986

Mar. Ecol. Prog. Ser.

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Eddies along the western frontal boundary of the Gulf Stream result in the episodic formation of physically and biologically distinct water masses at the continental shelf break (ca 200 m lsobath) off the southeastern United States. Standardized counts of seabirds were made simultaneously with ship-board and satellite-derived (VHRR) hydrographic measurements in 3 eddy-assoc~ated water masses during July 1983, and in 4 water masses during August 1984. Two statistical models were used to test for significant relations between seabird species composition and these water masses. Contingency analyses of abundance data from both cruises revealed that seabird specles were not distributed independently of water mass type (p < ,005). Tested against the null hypothesis of homogeneous species' abundances, 85 % of common (densities 2 0 5 birds km-2) seabird species exhibited significant affinities for a single water mass. The aerially foraging and feeding black-capped petrel Pterodroma hasitata and bridled tern Sterna anaethetus were most abundant in oligotrophic Gulf Stream and warm filament water, respectively. Species foraging on the ocean surface and feeding for more prolonged periods, shearwaters Puffinus gravis and Calonectrjs diornedea and storm-petrels Oceanites oceanicus and Oceanodroma castro, were most abundant in the upwelled cold core of the eddy. Interspecific variation in seabird affinities for meso-scale (50 to 150 km) water masses can be attributed to trophic segregation originating from species-specific foraging behaviors, and oceanographic processes that dlrectly or indirectly influence prey availability. These patterns indicate that apex marine consumers parallel other taxa and trophic groups in their responses to environmental heterogeneity induced by western boundary currents. Gulf Stream frontal eddies persist at 'event' time scales (2 to 14 d ) , thereby further suggesting that some s e a b~r d s are functionally integrated with marine communities affiliated with relatively small, ephemeral, and kinetic physical features.

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Section: Resultsmentioning

confidence: 99%

Seabird segregation at Gulf Stream frontal eddies

Haney¹

1986

Mar. Ecol. Prog. Ser.

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“…Histioteuthis bonnellii (Ferussac, 1834) The division of Histioteuthis bonnellii into two subspecies by Clarke (1980), when he named H. b. corpuscula from the fringing waters to the north of the SSTC in the Atlantic and western Indian oceans, and recent knowledge of reported (Clarke and MacLeod, 1982;Brandt, 1983) and unreported (NMNZ, NMV, UMML) captures of bonnellii in the subtropical waters of the Tasman Sea and north of New Zealand called for a detailed study of this mainly Atlantic species over its broad geographic range. Although such a study was not possible because of the lack of sufficient material, before (NV) and at the workshop we were able to critically examine the valuable, unreported collection of 53 mostly large juvenile, subadult, and adult specimens of bonnellii (USNM).…”

Section: Histioteuthis Bonnellii Species Groupmentioning

confidence: 99%

“…The few captures reported from the Indian Ocean are widely scattered between 10°N and the SSTC and are mostly associated with land and submarine rises of the western sector. East of Australia, a number of specimens have been taken between 150°E and 155°E, 07°S and 38°S, with the southernmost captures coming from the East Australian Current (Brandt, 1983;C. Lu, unpublished data).…”

Section: Histioteuthis Meleagroteuthis (Chun 1910) Figure 17mentioning

confidence: 99%

Systematics and Biogeography of cephalopods. Volume II

Voss¹,

Sweeney²

1998

Smithsonian Contributions to Zoology

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The Oegopsida family Onychoteuthidae contains five genera, namely, Onychoteuthis, Ancistroteuthis, Onykia, Moroteuthis, and Kondakovia. The genus Chaunotuethis is considered to represent spent individuals of the other genera of the family. The present study clarified that two well-known nominal species, Onychoteuthis banksii (Leach, 1817) and Ancistroteuthis lichtensteinii (Ferussac and Orbigny, 1839), both represent species complexes in their broad distributional ranges. The genus Onykia may represent immature stages of other onychoteuthids. Moroteuthis robsoni Adam, 1962, which has hitherto been considered to be a Southern Ocean species, appears to extend its distribution into the warm Atlantic region. Reliable taxonomic records as well as knowledge of distributional differentiation by growth stage are still too scarce to draw a zoogeographical picture of each species in this family.

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“…Mesoscale eddies in this region act to locally enhance productivity at intermediate temporal and spatial scales, and submesoscale vortices on the flanks of transient jets may create productive patches on the order of a few km (Roden 1991). This environmental heterogeneity creates habitat diversity for potential prey of elephant seals, including fish and squid, given their thermal tolerances and preferences (Brandt 1981(Brandt , 1983(Brandt , 1993. Indeed, diversity of fish larvae has been shown to be highest in the TZ and lowest in the SAG (Norcross et al 2003).…”

Section: Tracking Ars and Ecoregionsmentioning

confidence: 99%

Climate-scale hydrographic features related to foraging success in a capital breeder, the northern elephant seal Mirounga angustirostris

Simmons¹,

Crocker²,

Hassrick³

et al. 2010

Endang. Species. Res.

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In marine ecosystems, physical and biological processes act at multiple temporal and spatial scales to influence the distribution of prey species and subsequently habitat selection of foraging apex predators. Understanding how apex predators may respond to climate changes requires knowledge of habitat selection in relation to measures of foraging success at spatio-temporal scales relevant to the question and analytical approach. In this study, we used satellite telemetry from 75 adult female northern elephant seals Mirounga angustirostris, coupled with point measures of foraging success (energy gain), to examine habitat selection at large temporal and spatial scales. The main hydrographic ecoregion used on the post-moult (PM) migration was the Transition Zone, while on the post-breeding (PB) migration, females focused on the Subarctic Gyre. Characteristics of arearestricted search (ARS) behaviours, as determined by the fractal landscape method (such as time spent in ARS, total distance travelled in ARS and number of ARS) also differed significantly between the PM and PB migrations. Underlying differences in prey composition and/or distribution may drive the differences seen in searching behaviour and foraging success of elephant seals at large scales. Despite these differences, seals showed comparable levels of foraging success across both migrations and in all ecoregions. Foraging success was notably greater than measured in previous studies. These results highlight the benefits of a capital breeding strategy to a relatively slow-moving, large vertebrate predator allowing individuals to exploit large areas of the heterogeneous North Pacific.

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Pelagic squid associationswith a warm-core eddy of the East Australian Current

Cited by 15 publications

References 28 publications

Seabird segregation at Gulf Stream frontal eddies

Seabird segregation at Gulf Stream frontal eddies

Systematics and Biogeography of cephalopods. Volume II

Climate-scale hydrographic features related to foraging success in a capital breeder, the northern elephant seal Mirounga angustirostris

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