Assemblages of micronektonic fishes and invertebrates in a gradient of regional warming along the Western Antarctic Peninsula

Parker, Melanie L.; Fraser, William R.; Ashford, Julian R.; Patarnello, Tomaso; Zane, Lorenzo; Torres, Joseph J.

doi:10.1016/j.jmarsys.2015.07.005

Cited by 26 publications

(19 citation statements)

References 69 publications

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“…This was consistent with an earlier review by Kellermann (1996), who suggested that fish spawned in the Bellingshausen Sea were advected over the western Antarctic Peninsula shelf via slope transport in the ACC. Genetics data also indicated connectivity via the AACC between silverfish found in Marguerite Bay and Charcot Island (Agostini et al 2015), which was further supported by reproductive data (La Mesa et al 2015b), otolith chemistry (Ferguson 2012), community spatial distributions (Parker et al 2015), and particle simulations based on a circulation model for the southwestern Antarctic Peninsula shelf (Piñones et al 2011). Additionally, particle simulations combined with otolith age data suggested that larvae sampled off Joinville Island were spawned in Larsen Bay in the western Weddell Sea, before being transported around the northern Antarctic Peninsula and into the Bransfield Gyre via the AACC (La Mesa et al 2015a).…”

Section: Testing Population Structure Along the Continental Shelfmentioning

confidence: 80%

Spatial structuring and life history connectivity of Antarctic silverfish along the southern continental shelf of the Weddell Sea

Caccavo¹,

Ashford²,

Ryan³

et al. 2019

Mar. Ecol. Prog. Ser.

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A multi-disciplinary approach was employed to examine a physical-biological population hypothesis for a critical forage species, the Antarctic silverfish Pleuragramma antarctica. Caccavo et al. (2018; Sci Rep 8: 17856) had shown strong gene flow along the westward Antarctic Slope Current, in addition to spatially recurring length modes that provided evidence for episodic connectivity. In this paper, otolith nucleus chemistry from a subset of fish collected in the southern Weddell Sea as part of a hydrographic survey of the Filchner Trough system was used to test between connectivity scenarios. Nucleus chemistry, which reflects environmental exposure during early life, showed significant spatial structuring despite homogeneity in microsatellite allele frequencies. Mg:Ca and Sr:Ca differentiated length modes, and Mg:Ca showed significant contrasts between Atka Bay, Halley Bay, and Filchner Trough. Physical-biological mechanisms may help reconcile structuring shown by otolith chemistry, length, and abundance data with prior evidence of gene flow. Such mechanisms include self-recruitment shaped by circulation associated with the Filchner Trough, fluctuations in mixing between immigrant and locally recruited fish, and feeding opportunities between inflowing Modified Warm Deep Water and outflowing Ice Shelf Water. The results illustrate how comparisons between multi-disciplinary techniques based on integrated sampling designs that incorporate hydrography can enhance understanding of population structure and connectivity around the Southern Ocean.

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Section: Testing Population Structure Along the Continental Shelfmentioning

confidence: 80%

Spatial structuring and life history connectivity of Antarctic silverfish along the southern continental shelf of the Weddell Sea

Caccavo¹,

Ashford²,

Ryan³

et al. 2019

Mar. Ecol. Prog. Ser.

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“…Due to heavy ice conditions and difficulties of access and sampling, the eastern Ross Sea is understudied compared to western areas. However, multi‐disciplinary approaches combining techniques that include genetics (Agostini et al., ), otolith chemistry (Ferguson, ), age distributions and circulation modelling (La Mesa, Piñones, et al., ), reproduction (La Mesa, Riginella, et al., ), and community studies (Parker et al., ) successfully tested population hypotheses along the Antarctic Peninsula. Spatial heterogeneity between discrete populations contrasts strongly to homogeneity between exported fish and their parent population, providing a useful test around which field sampling can be designed.…”

Section: Discussionmentioning

confidence: 99%

“…Lipid sequestration in large sacs composed of adipocytes (Eastman & DeVries, ) results in neutral buoyancy and low‐energy behavior in which fish are suspended in the water column to feed (La Mesa & Eastman, ). P. antarctica distribution can be explained by dispersal in regional circulation over the continental shelf (Agostini et al., ; Ferguson, ; Hubold, ; La Mesa, Piñones, Catalano, & Ashford, ; La Mesa et al., ; Parker et al., ). In Terra Nova Bay, the eggs occupy a layer of platelet ice under the fast ice and hatch from mid‐November through December (Vacchi et al., , ).…”

Section: Introductionmentioning

confidence: 99%

Early life history connectivity of Antarctic silverfish (Pleuragramma antarctica) in the Ross Sea

Brooks

Caccavo

Ashford

et al. 2018

Fisheries Oceanography

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A recent population hypothesis for Antarctic silverfish (Pleuragramma antarctica), a critical forage species, argued that interactions between life history and circulation associated with glacial trough systems drive circumpolar distributions over the continental shelf. In the Ross Sea, aggregations of eggs and larvae occur under fast ice in Terra Nova Bay, and the hypothesis predicted that dispersing larvae encounter outflow along the western side of Drygalski Trough. The outflow advects larvae towards the shelf‐break, and mixing with trough inflow facilitates return toward the inner shelf. To examine the hypothesis, we compared samples of P. antarctica collected near Coulman Island in the outflow, along Crary Bank in the inflow, and a third set taken over the rest of the Ross Sea. We ruled out misidentification using an innovative genetic validation. Silverfish larvae comprised 99.5% of the catch, and the highest population densities were found in Drygalski Trough. The results provided no evidence to reject the population hypothesis. Abundance indices, back‐calculated hatching dates, length distributions and growth were congruent with a unified early life history in the western Ross Sea, constrained by cryopelagic early stages in Terra Nova Bay. By contrast, a sample in the Bay of Whales revealed much smaller larvae, suggesting either a geographically separate population in the eastern Ross Sea, or westward connectivity with larvae spawned nearby by fish sourced from troughs upstream in the Amundsen Sea. These results illustrate how hypotheses that integrate population structure with life history can provide precise spatial predictions for subsequent testing.

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“…A recent study has found a reduction in P . antarcticum abundance related to ocean warming along the Western Antarctic Peninsula [ 65 ]. P .…”

Section: Discussionmentioning

confidence: 99%

Bimodal Winter Haul-Out Patterns of Adult Weddell Seals (Leptonychotes weddellii) in the Southern Weddell Sea

Boehme¹,

Baker²,

Fedak³

et al. 2016

PLoS ONE

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Hauling out is an essential component of pinniped life-history. Haul-out behaviour may be affected by biological (e.g. sex, age and condition) and physical factors (e.g. food availability and environmental conditions), and identifying these factors may help explain the spatio-temporal distribution and habitat use of pinnipeds. The aim of this study is to describe observed winter haul-out patterns of adult Weddell seals in the Weddell Sea and investigate the role of potential predictors to gain insight into the way these animals interact with the physical environment in this region. We examined the haul-out behaviour in relation to available biological (i.e., diving effort, sex) and physical information (i.e., sun angle). Thirty-three satellite telemetry tags were deployed on adult Weddell seals in the southern Weddell Sea during February 2007, 2009 and 2011, following their annual moult recording information on the behavioural mode of the animal: at surface, hauled out or diving. At the end of the austral summer Weddell seals spent, on average, more than 40% of their time hauled out on the ice. Under constant light conditions, it appears that physiological factors drive sex differences in the timing and duration of haul-out behaviour, with females spending on average more time hauled out than males during daylight hours. This time spent hauled-out declined to around 15% in both sexes by the beginning of autumn and remained at this level with a clear nocturnal haul-out pattern during the winter. The time spent diving increased during this period, indicating an increase in foraging effort during the winter months, and led to a common haul-out pattern in both sexes over winter. We found a positive relationship between haul-out duration and the percentage of time spent diving prior to a haul-out in both sexes, with the exception of female daytime haul-outs early in the year.

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Assemblages of micronektonic fishes and invertebrates in a gradient of regional warming along the Western Antarctic Peninsula

Cited by 26 publications

References 69 publications

Spatial structuring and life history connectivity of Antarctic silverfish along the southern continental shelf of the Weddell Sea

Spatial structuring and life history connectivity of Antarctic silverfish along the southern continental shelf of the Weddell Sea

Early life history connectivity of Antarctic silverfish (Pleuragramma antarctica) in the Ross Sea

Bimodal Winter Haul-Out Patterns of Adult Weddell Seals (Leptonychotes weddellii) in the Southern Weddell Sea

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