Indicators of pelagic forage community shifts in the California Current Large Marine Ecosystem, 1998–2016

Thompson, Andrew R.; Harvey, Chris J.; Sydeman, William J.; Barceló, Caren; Bograd, Steven J.; Brodeur, Richard D.; Fiechter, Jérôme; Field, John C.; Garfield, Newell; Good, Thomas P.; Hazen, Elliott L.; Hunsicker, Mary E.; Jacobson, Kym C.; Jacox, Michael G.; Leising, Andrew W.; Lindsay, Joshua; Melin, Sharon R.; Santora, Jarrod A.; Schroeder, Isaac D.; Thayer, Julie A.; Wells, Brian K.; Williams, Gregory D.

doi:10.1016/j.ecolind.2019.05.057

Cited by 38 publications

(44 citation statements)

References 62 publications

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“…To categorize assemblage shifts, we therefore visually identified years where deep transitions occurred from the chronological clusters following methods as described by Thompson, et al. (2019). Data were log e + 1‐transformed and the analyses performed on Bray–Curtis dissimilarity matrices.…”

Section: Methodsmentioning

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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Section: Methodsmentioning

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

Self Cite

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“…6). In pelagic ecosystems, community density and composition-and therefore available prey-varies horizontally, vertically, and temporally and is driven by various physical and biological factors (Sommer et al 2017;Netburn and Koslow 2018;Thompson et al 2019). This variability is likely to influence siphonophore feeding interactions.…”

Section: Potential Drivers Of Siphonophore Dietmentioning

confidence: 99%

Integrating siphonophores into marine food‐web ecology

Hetherington

Damian‐Serrano

Haddock

et al. 2022

Limnol Oceanogr Letters

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Recent work challenges the paradigm that gelatinous animals are trophic dead ends and demonstrates their central roles as predators and prey in marine food webs. However, that research is primarily focused on scyphozoan "true jellies." We review the ecological niches of siphonophores, gelatinous cnidarians that are understudied but abundant across the water column. We discuss methodological advances that facilitate studying the diets of gelatinous animals and consider avenues for future research. Our results illustrate that siphonophores occupy numerous trophic niches. There are diet differences between siphonophore suborders and species, and our results suggest that specialization may be more predominant within deep, compared to shallow habitats. Synthesizing siphonophore predator-prey interactions highlights the diverse energy flow pathways through gelatinous components of marine food webs.

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“…Data collected by NHL, PRS, RREAS, CalCOFI and IMECOCAL surveys also provided a look at coast-wide forage fish assemblage responses to the marine heatwave. These were more nuanced than for zooplankton but revealed that strong shifts in fish assemblage structure were synchronous throughout the region even though the particular taxa that drove the changes differed among regions (Thompson et al, 2019a). Overall, larval abundances were very high, and the assemblage was largely southern and offshore species.…”

Section: Fisheries Survey Contributions To a Holistic Understanding O...mentioning

confidence: 97%

Fisheries Surveys Are Essential Ocean Observing Programs in a Time of Global Change: A Synthesis of Oceanographic and Ecological Data From U.S. West Coast Fisheries Surveys

et al. 2022

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As climate change and other anthropogenic impacts on marine ecosystems accelerate in the 21st century, there is an increasing need for sustained ocean time series. A robust and collaborative network of regional monitoring programs can detect early signs of unanticipated changes, provide a more holistic understanding of ecosystem responses, and prompt faster management actions. Fisheries-related surveys that collect fisheries-independent data (hereafter referred to as “fisheries surveys”) are a key pillar of sustainable fisheries management and are ubiquitous in the United States and other countries. From the perspective of ocean observing, fisheries surveys offer three key strengths: (1) they are sustained due to largely consistent funding support from federal and state public sector fisheries agencies, (2) they collect paired physical, chemical, and biological data, and (3) they have large and frequently overlapping spatial footprints that extend into the offshore region. Despite this, information about fisheries survey data collection can remain poorly known to the broader academic and ocean observing communities. During the 2019 CalCOFI Symposium, marking the 70th anniversary of the California Cooperative Oceanic Fisheries Investigations (CalCOFI), representatives from 21 ocean monitoring programs on the North American West Coast came together to share the status of their monitoring programs and examine opportunities to leverage efforts to support regional ecosystem management needs. To increase awareness about collected ocean observing data, we catalog these ongoing ocean time series programs and detail the activities of the nine major federal or state fisheries surveys on the U.S. West Coast. We then present three case studies showing how fisheries survey data contribute to the understanding of emergent ecosystem management challenges: marine heatwaves, ocean acidification, and contaminant spills. Moving forward, increased cross-survey analyses and cooperation can improve regional capacity to address emerging challenges. Fisheries surveys represent a foundational blueprint for ecosystem monitoring. As the international community moves toward a global strategy for ocean observing needs, fisheries survey programs should be included as data contributors.

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Indicators of pelagic forage community shifts in the California Current Large Marine Ecosystem, 1998–2016

Cited by 38 publications

References 62 publications

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

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

Integrating siphonophores into marine food‐web ecology

Fisheries Surveys Are Essential Ocean Observing Programs in a Time of Global Change: A Synthesis of Oceanographic and Ecological Data From U.S. West Coast Fisheries Surveys

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