Shoreward swimming boosts modeled nearshore larval supply and pelagic connectivity in a coastal upwelling region

Drake, Patrick T.; Edwards, Christopher A.; Morgan, Steven G.; Satterthwaite, Erin V.

doi:10.1016/j.jmarsys.2018.07.004

Cited by 16 publications

(11 citation statements)

References 123 publications

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“…The cues for directed horizontal swimming, however, are not obvious. Indeed, horizontal swimming velocities of several cm s −1 would be necessary to produce horizontal transports similar to those estimated here for vertically swimming organisms (Drake et al 2018).…”

Section: Discussionsupporting

confidence: 80%

Larval cross‐shore transport estimated from internal waves with a background flow: The effects of larval vertical position and depth regulation

Garwood

Lucas

Naughton

et al. 2020

Limnology & Oceanography

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Cross-shore velocities in the coastal ocean typically vary with depth. The direction and magnitude of transport experienced by meroplanktonic larvae will therefore be influenced by their vertical position. To quantify how swimming behavior and vertical position in internal waves influence larval cross-shore transport in the shallow ($ 20 m), stratified coastal waters off Southern California, we deployed swarms of novel, subsurface larval mimics, the Mini-Autonomous Underwater Explorers (M-AUEs). The M-AUEs were programmed to maintain a specified depth, and were deployed near a mooring. Transport of the M-AUEs was predominantly onshore, with average velocities up to 14 cm s −1. To put the M-AUE deployments into a broader context, we simulated > 500 individual high-frequency internal waves observed at the mooring over a 14-d deployment; in each internal wave, we released both depth-keeping and passive virtual larvae every meter in the vertical. After the waves' passage, depth-keeping virtual larvae were usually found closer to shore than passive larvae released at the same depth. Near the top of the water column (3-5-m depth), $ 20% of internal waves enhanced onshore transport of depth-keeping virtual larvae by ≥ 50 m, whereas only 1% of waves gave similar enhancements to passive larvae. Our observations and simulations showed that depth-keeping behavior in high-frequency internal waves resulted in enhanced onshore transport at the top of the water column, and reduced offshore dispersal at the bottom, compared to being passive. Thus, even weak depth-keeping may allow larvae to reach nearshore adult habitats more reliably than drifting passively.

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Section: Discussionsupporting

confidence: 80%

Larval cross‐shore transport estimated from internal waves with a background flow: The effects of larval vertical position and depth regulation

Garwood

Lucas

Naughton

et al. 2020

Limnology & Oceanography

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“…For the velocities and vertical diffusivities in Eq. 1, an established configuration of the Regional Ocean Modeling System (ROMS) was used for the full California Current System based on Drake et al (2011Drake et al ( , 2013, with a high resolution nest as in Drake et al (2018) Drake et al (2018). Briefly, the model was forced by hourly fields from the Coupled Atmospheric Mesoscale Prediction System (COAMPS) (Hodur et al, 2002).…”

Section: Velocity and Vertical Turbulent Diffusivitymentioning

confidence: 99%

Modeling Environmental DNA Transport in the Coastal Ocean Using Lagrangian Particle Tracking

et al. 2019

Self Cite

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A number of studies have illustrated the utility of environmental DNA (eDNA) for detecting marine vertebrates. However, little is known about the fate and transport of eDNA in the ocean, thus limiting the ability to interpret eDNA measurements. In the present study, we explore how fate and transport processes affect oceanic eDNA in Monterey Bay, CA, United States (MB). Regional ocean modeling predictions of advection and mixing are used for an approximately 10,000 km 2 area in and around MB to simulate the transport of eDNA. These predictions along with realistic settling rates and first-order decay rate constants are applied as inputs into a particle tracking model to investigate the displacement and spread of eDNA from its release location. We found that eDNA can be transported on the order of tens of kilometers in a few days and that horizontal advection, decay, and settling have greater impacts on the displacement of eDNA in the ocean than mixing. The eDNA particle tracking model was applied to identify possible origin locations of eDNA measured in MB using a quantitative PCR assay for Northern anchovy (Engraulis mordax). We found that eDNA likely originated from within 40 km and south of the sampling site if it had been shed approximately 4 days prior to sampling.

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“…A more robust analysis would be to structure a survey that repeatedly samples in a grid pattern during wind events and directly quantifies the movement of larvae. As no larval fish size data were available, swimming ability was not considered, which is known to be an important factor influencing larval movement (Leis, 2007;Drake et al, 2018). While this could potentially bias analyses, we considered the swimming ability of larvae within each sample to be representative of a normal distribution (modelled as part of the random project effect) and any strong swimmers would have likely avoided capture by the slow plankton net.…”

Section: Limitations Of This Studymentioning

confidence: 99%

Coastal winds and larval fish abundance indicate a recruitment mechanism for southeast Australian estuarine fisheries

Schilling

Hinchliffe

Gillson

et al. 2020

Preprint

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Coastal winds transport larval fish towards the coast and estuaries where they ultimately recruit, yet our understanding of the mechanism of how different coastal winds interact to influence estuarine recruitment is incomplete. Here, we first demonstrate a two-stage recruitment mechanism showing that larvae of coastally spawned species increased in abundance with moderately strong upwelling favourable winds 14 days prior to sampling, reflecting increased nutrient and plankton availability for larval fish. The larvae of coastally spawned species increased in abundance with onshore (downwelling favourable) winds three days prior to sampling, which retain larvae near the coast, facilitating estuarine recruitment through onshore transport. Secondly, we show that effects of wind during the spawning period can be detected 2–8 years later (depending on the species) in estuarine commercial fisheries catch rates. Finally, we show in the southeast Australian region, upwelling favourable winds have increased while downwelling favourable winds have decreased since 1850, potentially reducing larval recruitment to estuaries. The two-stage wind mechanism identified in this study is likely applicable to other regions where wind driven upwelling occurs and influences onshore and offshore transport. Future research should incorporate coastal winds into predictions of estuarine catch rates.

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Shoreward swimming boosts modeled nearshore larval supply and pelagic connectivity in a coastal upwelling region

Cited by 16 publications

References 123 publications

Larval cross‐shore transport estimated from internal waves with a background flow: The effects of larval vertical position and depth regulation

Larval cross‐shore transport estimated from internal waves with a background flow: The effects of larval vertical position and depth regulation

Modeling Environmental DNA Transport in the Coastal Ocean Using Lagrangian Particle Tracking

Coastal winds and larval fish abundance indicate a recruitment mechanism for southeast Australian estuarine fisheries

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