Coastal upwelling fronts as a boundary for planktivorous fish distributions

Sato, Mei; Barth, John A.; Benoit‐Bird, Kelly J.; Pierce, Stephen D.; Cowles, Timothy J.; Brodeur, Richard D.; Peterson, William T.

doi:10.3354/meps12553

Cited by 26 publications

(31 citation statements)

References 75 publications

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“…For example, anchovies are particularly sensitive to temperature (Kaltenberg, 2010;Sato et al, 2018), while krill are tolerant of a wide range of temperatures (Ross, 1982), reducing the likelihood that their similarly intense aggregation behavior is in response to temperature variation. However, that aggregation in response to upwelling was observed to have a similar pattern for both krill and anchovies allows us to weigh the likelihood of some hypotheses.…”

Section: Discussionmentioning

confidence: 99%

Forage Species Swarm in Response to Coastal Upwelling

Benoit‐Bird

Waluk

Ryan

2019

Geophysical Research Letters

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We observed the distribution and identity of forage species to infer behavioral changes in response to intraseasonal variation in the coastal upwelling ecosystem of Monterey Bay, California. While the biomass of forage species remained comparable, the small‐scale distribution of krill and anchovies was strongly affected by upwelling conditions. When regional upwelling influences were strong in the Bay, both species formed numerous discrete swarms and schools. During relaxation, both species were more diffusely distributed. Rather than gross changes in spatial distribution, a process that could take a long time for these relatively small animals, forage species responded to the short time scale dynamics that occur between days in the upwelling season with changes in their aggregative behavior. The behavioral responses observed highlight the need to study within‐season dynamics in upwelling systems in addition to their cumulative influence in order to understand the ecological processes of these productive systems.

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Section: Discussionmentioning

confidence: 99%

Forage Species Swarm in Response to Coastal Upwelling

Benoit‐Bird

Waluk

Ryan

2019

Geophysical Research Letters

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“…Note that in our work we focus only on open ocean Lagrangian fronts, that is, fine-scale frontal features induced by the mesoscale open ocean activity. In particular, we intentionally exclude coastal fronts as well as large scale fronts, whose dynamics and ecological role may be different (e.g., Lara-Lopez et al (2012); Netburn and Koslow (2018); Sato et al (2018)). Finally, the limitations of our analysis must be discussed.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, fishing vessels may target intentionally frontal systems. Unbiased fish measurements have been instead recently used by Sato et al (2018) to analyse the relationship between a frontal system and acoustic measurements in a coastal upwelling system. This allowed the authors to highlight the different role played by in-shore and off-shore waters.…”

Section: Introductionmentioning

confidence: 99%

Fine-scale fronts as hotspots of fish aggregation in the open ocean

Baudena

Ser‐Giacomi

D’Onofrio

et al. 2019

Preprint

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Oceanic Lagrangian Coherent Structures have been shown to 15 deeply influence the distribution of primary producers and, at the other 16 extreme of the trophic chain, top predators. However, the relationship be-17 tween these structures and intermediate trophic levels is much more ob-18 scure. In this paper we address this knowledge gap by comparing acous-19 tic measurements of mesopelagic fish concentrations to satellite-derived 20 fine-scale Lagrangian Coherent Structures in the open ocean. The results 21 demonstrate unambiguously that higher fish concentrations are signifi-22 cantly associated with stronger Lagrangian Coherent Structures, and we 23 observe that these features represent a limiting condition for high fish 24concentrations. A model, specifically built for mid trophic levels with 25 realistic parameters, provides a possible mechanism of fish aggregation, 26 and is coherent with the observations. These results may help to inte-27 grate intermediate trophic levels in trophic models, which can ultimately 28 support management and conservation policies. 29 Introduction 30 Marine biomass distribution is highly patchy and variable in time across the 31 entire trophic web Bertrand et al. (2014); McManus and Woodson (2012). Dis-32 cerning the factors underpinning ocean patchiness is fundamental to understand 33 how they influence biogeochemical reactions and ecosystem stability Martin 34 (2003); Lévy and Martin (2013). These issues are pivotal for conservation pur-35 poses Gaines et al. (2010) and for assessing the impact of climate change on the 36 marine environment Hoegh-Guldberg and Bruno (2010).37 One of the origins of the heterogeneity of the biotic fields is the dynamic nature 38 of the ocean environments, which transforms the water masses on a large range 39 2 Fine-scale fronts as hotspots of fish aggregation in the open ocean.of temporal scales, including those of ecological relevance. In this regard, a spe-40 cial role is fulfilled by the mesoscale and submesoscale McGillicuddy (2016), now 41 commonly referred to together as "fine-scales", which span a spatial range from 42 a few to hundreds of kilometers. 43One fruitful approach for capturing the structuring effect of fine-scale dynamics 44 is the extraction of so-called Lagrangian Coherent Structures, and in particu-45 lar Lagrangian fronts Haller (2015); Lehahn et al. (2018). Lagrangian Coherent 46 Structures (LCSs) provide several types of information regarding flow proper-47 ties, such as the location of fronts, barriers to transport Boffetta et al. (2001), 48 or retentive and coherent regions d'Ovidio et al. (2013). One of the most com-49 mon Lagrangian diagnostics used to determine LCSs is the Finite-size Lyapunov 50Exponent (FSLE, d'Ovidio et al., 2004). This measures the exponential rate of 51 water parcel deformation and has maximal values over frontal regions. 52 By shaping and elongating water patches, Lagrangian Coherent Structures have 53 been demonstrated to set the frontiers of phytoplanktonic patches in terms 54 of chlorophyl...

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“…During relaxation events, currents weaken, waters warm, and prey are retained (Melton et al 2009). Fronts can also impact the distribution of salmon prey through aggregation and heightened productivity (Sato et al 2018). In marine ecosystems, animals have shown heightened foraging success when physical conditions concentrate prey (Embling et al 2012, Heerah et al 2013.…”

Section: Open Pen Access Ccessmentioning

confidence: 99%