Delivery of zooplankton to the surf zone during strong internal tidal forcing and onshore winds in Baja California

Fernández-Aldecoa, R. G.; Ladah, Lydia B.; Morgan, Steven G.; Dibble, C. D.; Solana-Arellano, Elena; Filonov, Anatoliy

doi:10.3354/meps13034

Cited by 9 publications

(3 citation statements)

References 50 publications

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“…For instance, Tapia et al (2010) found that cyprids were usually most abundant between 15 and 25 m depth at a station that was 30 m deep, Bonicelli et al (2016) found cyprids also remained near the bottom at a 20 m site, and Hagerty et al (2018) observed cyprids distributed at depths near the bottom at stations along a transect extending from 4 to 12 m deep. Such depth distributions might allow cyprids to use cool, deep internal bores to transport closer to shore before reaching the intertidal zone (Pineda, 1991;Shanks et al, 2014;Fernández-Aldecoa et al, 2019). It is possible that deep waters are preferable for the non-feeding cyprids because cooler waters extend the lifespan of their lipid reserves, providing them with more time to reach intertidal habitats and increase their chances of successful settlement (see Satuito et al, 1996).…”

Section: Discussionmentioning

confidence: 99%

High Larval Concentrations and Onshore Transport of Barnacle Cyprids Associated With Thermal Stratification

2021

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To better understand the hydrodynamic and hydrographic conditions experienced by larvae in the nearshore (within 1 km of shore), and the role that larval behavior plays in mediating shoreward transport to adult benthic habitats, we examined the vertical distribution and concentration of barnacle cyprids in a shallow, nearshore region in southern California, United States. We collected high-resolution physical measurements of currents and temperature at 3 stations (8, 5, and 4 m depths), and high-frequency measurements of barnacle larvae at a 4 m deep station ∼300 m from shore. Larvae were sampled from distinct 1 m depth intervals between the surface and the bottom (0–1 m, 1–2 m, 2–3 m, 3 m-bottom), each hour for overnight periods that ranged between 13 to 24 h in five cruises during the summers of 2017 and 2018. Barnacle cyprids of Chthamalus fissus predominated in all samples. Thermal stratification decreased closer to shore, but when the nearshore-most station remained stratified (Δ°C m–1 ≥ 0.1), C. fissus cyprid concentrations were high to extremely abundant (exceeding 200 and 4,000 individuals m–3, respectively). There were significant positive correlations between thermal stratification and the log-transformed C. fissus concentration at cruise-to-cruise scales, and between stratification and vertical variability in the high-frequency cross-shore currents at 2-day scales. Additionally, estimated larval transport was relatively high and shoreward when nearshore thermal stratification was greatest. Significant, albeit small, diel differences in cyprid distributions were also observed, with the proportion of cyprids increasing near the surface at night, and concentrations greater during the day than at night. Collectively, these results suggest that thermal stratification increases larval supply to the nearshore, and may enhance onshore larval transport to augment chances of successful settlement and recruitment to the intertidal adult habitat.

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Section: Discussionmentioning

confidence: 99%

High Larval Concentrations and Onshore Transport of Barnacle Cyprids Associated With Thermal Stratification

2021

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“…However, co-occurring low-oxygen and hightemperature conditions can be unfavourable for the growth rate of calcifying reef organisms in general (Nelson and Altieri, 2019). Whilst frequent internal waves at Ile Anglaise and Moresby likely provide a conducive environment for calcareous worms and bryozoan growth through regular cooling, these events may also benefit these groups through the regular upwelling of prey plankton and nutrients (Leichter et al, 1998), as well as a mechanism for increased larval dispersal (Fernańdez-Aldecoa et al, 2019).…”

Section: Associations Between Cryptobenthic Communities and Environme...mentioning

confidence: 99%

Remote reef cryptobenthic diversity: Integrating autonomous reef monitoring structures and in situ environmental parameters

Steyaert

Lindhart²,

Khrizman³

et al. 2022

Front. Mar. Sci.

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Coral reef sessile organisms inhabiting cryptic spaces and cavities of the reef matrix perform vital and varied functional roles but are often understudied in comparison to those on exposed surfaces. Here, we assess the composition of cryptobenthic taxa from three remote tropical reef sites (Central Indian Ocean) alongside a suite of in situ environmental parameters to determine if, or how, significant patterns of diversity are shaped by local abiotic factors. To achieve this, we carried out a point-count analysis of autonomous reef monitoring structure (ARMS) plate images and employed in situ instrumentation to recover long-term (12 months) profiles of flow velocity, wave heights, temperature, dissolved oxygen, and salinity, and short-term (3 weeks) profiles of light and pH. We recovered distinct environmental profiles between sampling sites and observed that ocean-facing reefs experienced frequent but short-lived cooling internal wave events and that these were key in shaping in situ temperature variability. By comparing temperature and wave height profiles recovered using in situ loggers with ex situ models, we discovered that global satellite products either failed to recover site-specific profiles or both over- and underestimated actual in situ conditions. We found that site choice and recruitment plate face (top or bottom) significantly impacted the percentage cover of bryozoans, gastropods, soft and calcified tube worms, as well as crustose coralline algae (CCA) and fleshy red, brown, and green encrusting macroalgae on ARMS. We observed significant correlations between the abundance of bryozoans, CCA, and colonial tunicates with lower mean temperature and higher mean dissolved oxygen profiles observed across sites. Red and brown encrusting macroalgae abundance correlated significantly with medium-to-high flow velocities and wave height profiles, as well as higher pH and dissolved oxygen. This study provides the first insight into cryptobenthic communities in the Chagos Archipelago marine-protected area and adds to our limited understanding of tropical reef sessile communities and their associations with environmental parameters in this region. With climate change accelerating the decline of reef ecosystems, integrating analyses of cryptobenthic organisms and in situ physicochemical factors are needed to understand how reef communities, if any, may withstand the impacts of climate change.

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“…Pineda et al (2009) suggested that the task could be simplified by reducing the set of empirically derived processes and rates to larval upward swimming, onshore transport, mortality and recruitment to the adult population. However, determining the multiple processes delivering larvae to shore (Shanks 1995;Morgan et al 2009Morgan et al , 2017Fernández Aldecoa et al 2019) and reliably estimating larval mortality in an advective environment (Morgan 1995;) are challenging tasks themselves, and this approach limits processes regulating population dynamics to the larval recruitment stage of the life cycle.…”

Section: Discussionmentioning

confidence: 99%

Coupling and Decoupling of Reproduction and Larval Recruitment

Morgan¹

2021

Estuaries and Coasts

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Stock-recruitment relationships for managing commercial fisheries are difficult to measure and notoriously poor, so marine ecologists have relied on larval recruitment as a proxy for how planktonic processes regulate populations and communities. However, my literature review revealed that coupling between reproductive output and recruitment in benthic populations was common, occurring in 62% of 112 studies and 64% of 81 species. Coupling was considerably stronger for studies on brooders (72%) than broadcast-spawners (46%) and taxa with short (74%) than long (56%) planktonic larval durations (PLDs); hence, it was highest for brooders with short PLDs (94%). Coupling was similar in studies on benthic animals (63%) and seagrasses and kelp (56%). Coupling was detected more often by quantifying both reproductive output and settlement (79%) than adult density and recruitment (60%). It also was detected in 83% of just 21% of studies that estimated dispersal. Coupling was even detected by 55% of the 46% of studies conducted at just one site and 58% of the 65% of studies lasting no longer than 3 years. Decoupling was detected 33 times in invertebrates and fishes, occurring more often in the plankton (48.5%) and during reproduction (45.5%) than after settlement (6%), and nine times in seagrasses and kelp, occurring more often during reproduction (44.4%) than postsettlement (33.3%) or in the plankton (22.2%). Widespread coupling between reproductive output and settlement for sedentary, benthic species suggests that the poor stock-recruitment relationships typical of vagile, wide-ranging, pelagic species may be due more to the difficulty of detecting them than decoupling.

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Delivery of zooplankton to the surf zone during strong internal tidal forcing and onshore winds in Baja California

Cited by 9 publications

References 50 publications

High Larval Concentrations and Onshore Transport of Barnacle Cyprids Associated With Thermal Stratification

High Larval Concentrations and Onshore Transport of Barnacle Cyprids Associated With Thermal Stratification

Remote reef cryptobenthic diversity: Integrating autonomous reef monitoring structures and in situ environmental parameters

Coupling and Decoupling of Reproduction and Larval Recruitment

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