Transport patterns of Pacific sardine Sardinops sagax eggs and larvae in the California Current System

Weber, Edward D.; Chao, Yi; Chai, Fei; McClatchie, Sam

doi:10.1016/j.dsr.2015.02.012

Cited by 12 publications

(6 citation statements)

References 52 publications

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“…This can be attributed to the main preference of larval feeding on SZ in the model, which prevented very low consumption, despite the offshore larval distribution. This broadly agreed with existing knowledge that sardines appear to feed on smaller prey items and be advected in offshore areas (Rykaczewski & Checkley, ; Weber et al., ).…”

Section: Discussionsupporting

confidence: 90%

Climate variability and sardine recruitment in the California Current: A mechanistic analysis of an ecosystem model

Politikos

Curchitser

Rose

et al. 2018

Fisheries Oceanography

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Recruitment varies substantially in small pelagic fish populations. Understanding of the mechanisms linking environment to recruitment is essential for the effective management of fisheries resources. In this study, we used a fully coupled end‐to‐end ecosystem model to study the effect of climate variability on sardine recruitment in the California Current System during 1965–2006. Ocean variability was represented by ROMS hydrodynamic and NEMURO biogeochemical models, and sardine population dynamics was simulated through a full life cycle individual‐based model. Model analysis was designed to elucidate how changes in abiotic and biotic conditions may impact the spawning habitats, early life stage survival, and ultimately recruitment of sardine. Our findings revealed the importance of spatial processes to shape early life stages dynamics. Shifts in spawning habitats were dictated by the spatial variations in temperature and the behavioral movement of adults. Additionally, the spatial match of eggs with warmer temperatures and larvae with their prey influenced their survival. The northward shifts in spawning locations and the accomplishment of good recruitment in warmer years agreed with existing knowledge. Egg production and survival during egg and yolk‐sac larval stages were key factors to drive the long‐term variations in recruitment. Finally, our analysis provided a quantitative assessment of climate impact on year‐to‐year variation in sardine recruitment by integrating multiple hypotheses.

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Section: Discussionsupporting

confidence: 90%

Climate variability and sardine recruitment in the California Current: A mechanistic analysis of an ecosystem model

Politikos

Curchitser

Rose

et al. 2018

Fisheries Oceanography

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“…As such, they have the potential to disperse beyond MPA boundaries. In the future we plan to age larvae by counting daily otolith rings and use regional oceanic modelling systems (ROMS) models [ 70 ] to trace the path each larvae took to arrive at its location of capture and where it probably would have gone had it not been captured. This work should help better establish the degree to which the CCAs are providing a recruitment supplement to fished areas.…”

Section: Discussionmentioning

confidence: 99%

Larval abundances of rockfishes that were historically targeted by fishing increased over 16 years in association with a large marine protected area

et al. 2017

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Marine protected areas (MPAs) can facilitate recovery of diminished stocks by protecting reproductive adults. To effectively augment fisheries, however, reproductive output must increase within the bounds of MPAs so that larvae can be exported to surrounding areas and seed the region. In response to dramatic declines of rockfishes (Sebastes spp.) in southern California by the late 1990s two large MPAs, the Cowcod Conservation Areas (CCAs), were established in 2001. To evaluate whether the CCAs affected rockfish productivity we evaluated the dynamics of 8 species that were, and 7 that were not, historically targeted by fishing. Abundances of 6/8 targeted and 4/7 non-targeted species increased regionally from 1998 to 2013. These upturns were probably affected by environmental conditions in addition to changes in fishing pressure as the presence of most species correlated negatively with temperature, and temperature was lower than the historic average in 11/15 years. Seventy-five per cent of the targeted, but none of the non-targeted species increased at a greater rate inside than outside the CCAs while controlling for environmental factors. Results indicate that management actions, coupled with favourable environmental conditions, facilitated the resurgence of multiple rockfish species that were targeted by intense fishing effort for decades.

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“…A similar existing underway system is the Continuous Underway Fish Eggs Sampler (CUFES, Checkley et al, 1997) that has been used worldwide to sample pelagic fish eggs [e.g. California Current (Weber et al, 2015), Bay of Biscay (Albaina et al, 2014), North Sea (Lelievre et al, 2012)] and is also a good sampler for small zooplankton (Sono et al, 2009). Underway systems such as the CUFES and CALPS operate continuously and under nearly all sea conditions, providing a real-time estimate of the volumetric abundance of particles at pump depth, and are thus particularly suitable for assessing aggregated distributions.…”

Section: Introductionmentioning

confidence: 99%

Comparison of zooplankton data collected by a continuous semi-automatic sampler (CALPS) and a traditional vertical ring net

et al. 2016

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We compared and evaluated the performance of a Continuous Automatic Litter and Plankton Sampler (CALPS) against the traditional ring net vertical haul. CALPS is a custom-made semi-automatic sampler, which collects water using a pump system at a single depth along a predetermined transect as the ship sails. CALPS underestimated species abundance compared to the ring net by a factor 1.61, but both datasets illustrated a similar species composition, community size structure and good agreement in the spatial distribution of abundance. Our analysis suggests that avoidance of the CALPS is likely to be the main factor responsible for the observed difference in sampling efficiency, but other factors, such as depth, area sampled and zooplankton patchiness, are also likely to play their part. We conclude that whilst the CALPS is not suitable for investigations that require accurate measures of abundance, it is an ideal tool to identify and quantify changes in plankton communities and diversity. A particular advantage over more traditional vertical sampling methods is that it can be integrated within existing multidisciplinary surveys at little extra cost, thus making the CALPS particularly valuable as part of integrated monitoring programmes to underpin policy areas such as the EU Marine Strategy Framework Directive.

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Transport patterns of Pacific sardine Sardinops sagax eggs and larvae in the California Current System

Cited by 12 publications

References 52 publications

Climate variability and sardine recruitment in the California Current: A mechanistic analysis of an ecosystem model

Climate variability and sardine recruitment in the California Current: A mechanistic analysis of an ecosystem model

Larval abundances of rockfishes that were historically targeted by fishing increased over 16 years in association with a large marine protected area

Comparison of zooplankton data collected by a continuous semi-automatic sampler (CALPS) and a traditional vertical ring net

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