Reproductive Strategies of the Antarctic Silverfish: Known Knowns, Known Unknowns and Unknown Unknowns

Ghigliotti, Laura; Herasymchuk, Volodymyr V.; Kock, Karl-Hermann; Vacchi, Marino

doi:10.1007/978-3-319-55893-6_9

Cited by 7 publications

(15 citation statements)

References 56 publications

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Section: Discussionmentioning

confidence: 99%

“…Flow along the slope is westward, constraining return to potential nursery grounds under fast ice in the vicinity of the Bay of Whales. Considerable uncertainty remains over whether the larvae represent a true nursery ground (Ghigliotti et al., ), and more work is required to resolve the physical‐biological interactions by which retention and self‐recruitment could support a discrete population in the eastern Ross Sea.…”

Section: Discussionmentioning

confidence: 99%

“…Only a single tow was undertaken, but the mean length of larvae (SL 9.8 mm) indicated strong spatial structuring. There is considerable uncertainty over the distribution of egg and larval aggregations around the Antarctic (Ashford et al, 2017;Ghigliotti et al, 2017). Nevertheless, recently hatched larvae of 10 mm in length have previously been reported in the Bay of Whales, earlier in the season between mid-December and mid-January (Biggs, 1982 (Granata et al, 2002;Keller, 1983), the longer season and higher productivity of the Ross Ice Shelf polynya (Arrigo, van Dijken, & Strong, 2015), or the southern location of the Bay of Whales (78.5°S) relative to Terra Nova Bay (74.83°S).…”

Section: Length Growth Rate and Hatch Datesmentioning

confidence: 99%

“…The trough near Coulman Island is notable for its curvature and narrowing, as well as a reverse slope and glacial discontinuities like grounding zone wedges (Anderson et al, 2014) (Ghigliotti et al, 2017), and more work is required to resolve the physical-biological interactions by which retention and self-recruitment could support a discrete population in the eastern Ross Sea.…”

Section: Retention By Trough Systems and Transport Along Shelfmentioning

confidence: 99%

“…In the Drygalski and Joides Troughs, southward jets carry the MCDW towards the inner shelf at velocities of 0.3 m/s and disperse it across the neighbouring Mawson and Pennell Banks (Kohut, Hunter, & Huber, ). Although reports indicate larvae of P. antarctica in McMurdo Sound and off Ross Island (summarized in Ghigliotti, Herasymchuk, Kock, & Vacchi, ), the existence of nursery grounds remains undetermined with no evidence so far of consistent aggregations such as those observed in Terra Nova Bay (Ghigliotti et al., ). Moreover, otolith chemistry from adults showed no evidence of mixing, implying a single population in the western Ross Sea (Ferguson, ).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%