Evidence for seasonal cycles in deep‐sea fish abundances: A great migration in the deep SE Atlantic?

Milligan, Rosanna; Scott, E. Marian; Jones, Daniel O. B.; Bett, Brian J.; Jamieson, Alan J.; O'Brien, Robert; Costa, Sofia Pereira; Rowe, Gilbert T.; Ruhl, Henry A.; Smith, Ken; Susanne, Philippe de; Vardaro, Michael; Bailey, David M.

doi:10.1111/1365-2656.13215

Cited by 22 publications

(14 citation statements)

References 66 publications

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“…Arrows on the map show the position and direction of the two main currents in the region (IC = the warm Irminger current; EGC = the cold East Greenland Current) biomass, the main food source for benthic organisms in the deep (Soltwedel et al, 2016). Behavioural responses of deep-sea fish communities to interannual changes in particulate organic carbon flux to the seafloor was recently documented in the South East Atlantic (Milligan et al, 2020). A possible change in the transfer of the organic matter to deep habitats in our region may further have been caused by the intensification of winter convection events observed in the North Atlantic (Piron et al, 2017;Yashayaev and Loder, 2017).…”

Section: Productivity and Ocean Couplingmentioning

confidence: 99%

Deep demersal fish communities respond rapidly to warming in a frontal region between Arctic and Atlantic waters

Emblemsvåg

Werner

Núñez‐Riboni

et al. 2022

Global Change Biology

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The most prominent impact of climate warming on marine ecosystems are distributional shifts in fish, which influence species interactions and food web organization. For shallow continental shelf seas, this usually implies a poleward shift or movement to deeper waters to retreat in cold water refuges (Dahlke et al., 2018;Fossheim et al., 2015;Pinsky et al., 2013). Although more than 90% of the habitable oceans' volume lies below 200 m, long-term studies of biodiversity in slope and deep-sea regions are rare (Danovaro et al., 2020;Howell et al., 2020;Levin and Bris, 2015). It has often been proposed that the rapidity of species' responses to climate change decreases with depth because deeper waters are thermally more stable (Levin and Bris, 2015;Van der Spoel, 1994;Yasuhara et al., 2014). However, rapid responses in the abundance of deep-sea biotas, such as fish, nematodes and amphipods, to changing environmental conditions at the surface indicate that processes such as changes in primary productivity can trigger unexpectedly fast responses in the deep

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Section: Productivity and Ocean Couplingmentioning

confidence: 99%

Deep demersal fish communities respond rapidly to warming in a frontal region between Arctic and Atlantic waters

Emblemsvåg

Werner

Núñez‐Riboni

et al. 2022

Global Change Biology

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“…Trends in the vertical movements of mobile species are widespread in marine ecosystems. They extend across ecological timescales, from the cycles of the tides (Gibson 2003;Krumme 2009) to those of the seasons (Hyndes et al 1999;Milligan et al 2020) and those exhibited over ontogenetic development (Grubbs 2010;Frank et al 2018). They are also prevalent across trophic levels, from the diel vertical migration (DVM) of plankton (Hays 2003;Bianchi and Mislan 2016) to the diving patterns of cetaceans (Keen et al 2019;Caruso et al 2020) and pelagic sharks (Papastamatiou and Lowe 2012;Schlaff et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Environmental cycles and individual variation in the vertical movements of a benthic elasmobranch

Lavender

Aleynik

Dodd³

et al. 2021

Mar Biol

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Trends in depth and vertical activity reflect the behaviour, habitat use and habitat preferences of marine organisms. However, among elasmobranchs, research has focused heavily on pelagic sharks, while the vertical movements of benthic elasmobranchs, such as skate (Rajidae), remain understudied. In this study, the vertical movements of the Critically Endangered flapper skate (Dipturus intermedius) were investigated using archival depth data collected at 2 min intervals from 21 individuals off the west coast of Scotland (56.5°N, −5.5°W) in 2016–17. Depth records comprised nearly four million observations and included eight time series longer than 1 year, forming one of the most comprehensive datasets collected on the movement of any skate to date. Additive modelling and functional data analysis were used to investigate vertical movements in relation to environmental cycles and individual characteristics. Vertical movements were dominated by individual variation but included prolonged periods of limited activity and more extensive movements that were associated with tidal, diel, lunar and seasonal cycles. Diel patterns were strongest, with irregular but frequent movements into shallower water at night, especially in autumn and winter. This research strengthens the evidence for vertical movements in relation to environmental cycles in benthic species and demonstrates a widely applicable flexible regression framework for movement research that recognises the importance of both individual-specific and group-level variation.

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“…Therefore, growth zones resembling those accepted as annuli for many shallow‐living species appear to be also deposited in these deep‐water macrourids throughout their life span. Seasonality in the deep sea may be dampened compared with that observed in shallow habitats but strong enough to cause seasonal food supply and migrations (Milligan et al ., 2020).…”

Section: Discussionmentioning

confidence: 99%

Notes on age determination, size and age structure, longevity and growth of co‐occurring macrourid fishes

Bergstad

Hunter

Cousins

et al. 2021

Journal of Fish Biology

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Nineteen species of the deep‐water fish family Macrouridae inhabit the Mid‐Atlantic Ridge (MAR) of the North Atlantic. Size and age structure, longevity and length at age were explored for seven of the more abundant species: Coryphaenoides armatus, Coryphaenoides brevibarbis, Coryphaenoides carapinus, Coryphaenoides guentheri, Coryphaenoides mediterraneus, Coryphaenoides rupestris and Macrourus berglax. The otoliths from these species had growth increments resembling those accepted as annuli in other deep‐water species for which validation experiments have been conducted. Based on the counts of these growth increments, age estimates were derived as the basis for studies of age structure, growth and longevity. All the species appeared to have relatively low growth rates, but the interspecific variation in longevity illustrates that there is a considerable variation within the family and among species inhabiting the same deep‐sea environment. Most of the species likely complete full life cycles on the MAR, but it is probable that both the youngest and the largest‐oldest individuals of some of the species were not sampled adequately.

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Evidence for seasonal cycles in deep‐sea fish abundances: A great migration in the deep SE Atlantic?

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 22 publications

References 66 publications

Deep demersal fish communities respond rapidly to warming in a frontal region between Arctic and Atlantic waters

Deep demersal fish communities respond rapidly to warming in a frontal region between Arctic and Atlantic waters

Environmental cycles and individual variation in the vertical movements of a benthic elasmobranch

Notes on age determination, size and age structure, longevity and growth of co‐occurring macrourid fishes

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