Early life history phenology among Gulf of Alaska fish species: Strategies, synchronies, and sensitivities

Doyle, Miriam J.; Strom, Suzanne L.; Coyle, Kenneth O.; Hermann, Albert J.; Ladd, Carol; Matarese, Ann C.; Shotwell, S. Kalei; Hopcroft, Russell R.

doi:10.1016/j.dsr2.2019.06.005

Cited by 18 publications

(19 citation statements)

References 99 publications

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“…It also has system‐level importance because directional alignment between flow and spatial translation of suitable habitat is hypothesized to affect the rate at which populations redistribute geographically (e.g., poleward flowing current aligned with global climate‐forced spatial translation of isotherms) (Sorte, 2013). While the GOA ichthyoplankton community is diverse (Doyle et al., 2019), habitat requirements for the juvenile stage of many species are not well known. This is a major shortfall in our understanding of the mechanisms controlling species‐specific recruitment, which is critical for anticipating system‐wide response to novel climate regimes (Bailey et al., 2005; Litzow et al., 2019).…”

Section: Discussionmentioning

confidence: 99%

“…Conceptually, the transport of propagules across unequal habitats is an important population and ecosystem dynamic because species requirements (e.g., Doyle et al, 2019;Shanks & Eckert, 2005) interact with climate and ocean currents to dynamically redistribute populations across suitable habitat (Sorte, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…However, system dynamics are complex (Bailey, Ciannelli, Bond, Belgrano, & Stenseth, 2005) and correlative relationships are sensitive to changes in basin‐scale atmospheric patterns (Litzow et al., 2019), which underscores the importance of mechanistic understanding. Conceptually, the transport of propagules across unequal habitats is an important population and ecosystem dynamic because species requirements (e.g., Doyle et al., 2019; Shanks & Eckert, 2005) interact with climate and ocean currents to dynamically redistribute populations across suitable habitat (Sorte, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Interannual variation in the coastal distribution of a juvenile gadid in the northeast Pacific Ocean: The relevance of wind and effect on recruitment

Wilson

Laman

2020

Fisheries Oceanography

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Drift of propagules occurs within many populations inhabiting flow fields. This affects the number of propagules that rejoin their source population (recruitment) and plays a role in adaptive spatial redistribution. We focus on the cause and consequence of interannual variation in geographic distribution of population density among five cohorts of young-of-the-year (age-0) juvenile walleye pollock Gadus chalcogrammus in the western Gulf of Alaska (GOA). The coastal GOA is a wind-driven advective system. Walleye pollock spawn during spring and their eggs and larvae drift southwestward; by late summer, age-0 juveniles are variously distributed over the shelf. We found that high population densities of age-0 juveniles (ca. 6 months old) near the southwestward exit of the Alaska Coastal Current from the GOA corresponded with high abundance of larvae from the major spawning area upstream, but did not translate into high abundance at older ages. Further, offshore and upwelling-favorable winds were associated with the high downstream abundance and presumed export. In contrast, downwelling-favorable (northeasterly) wind during and shortly after spawning (April-May) was associated with high recruitment at age 1. Finally, we found that recruitment also increased with apparent retention of age-0 juveniles in favorable habitat upstream near the main spawning area. We hypothesize that windrelated retention in superior upstream habitat favors recruitment. Our results argue for including wind-driven transport in future walleye pollock recruitment models. We encourage more work on the juvenile stage of marine fishes aimed at understanding how transport and species-specific habitat suitability interact to affect population response to large-scale forcing.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interannual variation in the coastal distribution of a juvenile gadid in the northeast Pacific Ocean: The relevance of wind and effect on recruitment

Wilson

Laman

2020

Fisheries Oceanography

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“…Capelin larvae overwinter, a strategy that favors transformation into their juvenile form at a relatively large size, and development during the peak of productivity in spring (Doyle et al, 2019). It also allows for growth and lipid storage in summer/fall periods at age-1 (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Heatwave‐induced synchrony within forage fish portfolio disrupts energy flow to top pelagic predators

Arimitsu

Piatt

Hatch³

et al. 2021

Global Change Biology

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During the Pacific marine heatwave of 2014–2016, abundance and quality of several key forage fish species in the Gulf of Alaska were simultaneously reduced throughout the system. Capelin (Mallotus catervarius), sand lance (Ammodytes personatus), and herring (Clupea pallasii) populations were at historically low levels, and within this community abrupt declines in portfolio effects identify trophic instability at the onset of the heatwave. Although compensatory changes in age structure, size, growth or energy content of forage fish were observed to varying degrees among all these forage fish, none were able to fully mitigate adverse impacts of the heatwave, which likely included both top‐down and bottom‐up forcing. Notably, changes to the demographic structure of forage fish suggested size‐selective removals typical of top‐down regulation. At the same time, changes in zooplankton communities may have driven bottom‐up regulation as copepod community structure shifted toward smaller, warm water species, and euphausiid biomass was reduced owing to the loss of cold‐water species. Mediated by these impacts on the forage fish community, an unprecedented disruption of the normal pelagic food web was signaled by higher trophic level disruptions during 2015–2016, when seabirds, marine mammals, and groundfish experienced shifts in distribution, mass mortalities, and reproductive failures. Unlike decadal‐scale variability underlying ecosystem regime shifts, the heatwave appeared to temporarily overwhelm the ability of the forage fish community to buffer against changes imposed by warm water anomalies, thereby eliminating any ecological advantages that may have accrued from having a suite of coexisting forage species with differing life‐history compensations.

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“…Larval stages are thus commonly more sensitive to climatic fluctuations, making them valuable as indicators of changes occurring in the ecosystem (Boeing & Duffy‐Anderson, 2008; Brodeur et al., 2008). However, even similar taxa or species within the same assemblage can show diverse responses to environmental perturbations (Doyle et al., 2019; McClatchie et al., 2018; Morley et al., 2017). Understanding how ichthyoplankton assemblages respond to climatic variation can provide insight into food web processes, changes to adult populations and may also indicate failed recruitment (Bailey & Houde, 1989), though for many species a clear link between early‐life history and recruitment seldom exists (Lowerre‐Barbieri et al., 2016).…”

Section: Introductionmentioning

confidence: 99%

Responses of ichthyoplankton assemblages to the recent marine heatwave and previous climate fluctuations in several Northeast Pacific marine ecosystems

Nielsen

Rogers

Brodeur

et al. 2020

Global Change Biology

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The effects of climate warming on ecosystem dynamics are widespread throughout the world's oceans. In the Northeast Pacific, large‐scale climate patterns such as the El Niño/Southern Oscillation and Pacific Decadal Oscillation, and recently unprecedented warm ocean conditions from 2014 to 2016, referred to as a marine heatwave (MHW), resulted in large‐scale ecosystem changes. Larval fishes quickly respond to environmental variability and are sensitive indicators of ecosystem change. Categorizing ichthyoplankton dynamics across marine ecosystem in the Northeast Pacific can help elucidate the magnitude of assemblage shifts, and whether responses are synchronous or alternatively governed by local responses to regional oceanographic conditions. We analyzed time‐series data of ichthyoplankton abundances from four ecoregions in the Northeast Pacific ranging from subarctic to subtropical: the Gulf of Alaska (1981–2017), British Columbia (2001–2017), Oregon (1998–2017), and the southern California Current (1981–2017). We assessed the impact of the recent (2014–2016) MHW and how ichthyoplankton assemblages responded to past major climate perturbations since 1981 in these ecosystems. Our results indicate that the MHW caused widespread changes in the ichthyoplankton fauna along the coast of the Northeast Pacific Ocean, but impacts differed between marine ecosystems. For example, abundances for most dominant taxa were at all‐time lows since the beginning of sampling in the Gulf of Alaska and British Columbia, while in Oregon and the southern California Current species richness increased as did abundances of species associated with warmer waters. Lastly, species associated with cold waters also increased in abundances close to shore in southern California during the MHW, a pattern that was distinctly different from previous El Niño events. We also found several large‐scale, synchronized ichthyoplankton assemblage composition shifts during past major climate events. Current climate projections suggest that MHWs will become more intense and thus our findings can help project future changes in larval dynamics, allowing for improved ecosystem management decisions.

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Early life history phenology among Gulf of Alaska fish species: Strategies, synchronies, and sensitivities

Cited by 18 publications

References 99 publications

Interannual variation in the coastal distribution of a juvenile gadid in the northeast Pacific Ocean: The relevance of wind and effect on recruitment

Interannual variation in the coastal distribution of a juvenile gadid in the northeast Pacific Ocean: The relevance of wind and effect on recruitment

Heatwave‐induced synchrony within forage fish portfolio disrupts energy flow to top pelagic predators

Responses of ichthyoplankton assemblages to the recent marine heatwave and previous climate fluctuations in several Northeast Pacific marine ecosystems

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