Larval Competency of Red Abalone (<i>Haliotis rufescens</i>): A New Timeframe for Larval Distribution.

McCormick, Thomas B.; Buckley, Lorraine M.; Navas, Gabriela; Barber, Gloria; Billups, Brianne; Gill, Vanessa; Jones, B.E; Peterson, Nicholas; Saylor, Brianna; Sayre, James W.

doi:10.2983/035.031.0429

Cited by 5 publications

(2 citation statements)

References 20 publications

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“…Understanding tolerance ranges and optimal environmental parameters for cultivation and growth is the critical first step in a restoration effort to outplant laboratory-reared juveniles to natural habitats in southern California as described in the White Abalone Recovery Plan (National Marine Fisheries Service 2008). Information on environmental tolerances (Ben-Horin et al 2013, Braid et al 2005, Kimura et al 2011, Moore et al 2000, Pereria et al 2007, Takami et al 2002, Tutschulte 1976), larval development, and survival (Ebert & Houk 1984, Jaeckle & Manahan 1989, McCormick et al 2012, Roberts & Lapworth 2001, Takami 2001 has been reported for several species of abalone but is limited for larval and juvenile white abalone.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature, Diet, Light, and Cultivation Density on Growth and Survival of Larval and Juvenile White AbaloneHaliotis sorenseni(Bartsch, 1940)

McCormick¹,

Navas

Buckley

et al. 2016

Journal of Shellfish Research

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Section: Introductionmentioning

confidence: 99%

Effect of Temperature, Diet, Light, and Cultivation Density on Growth and Survival of Larval and Juvenile White AbaloneHaliotis sorenseni(Bartsch, 1940)

McCormick¹,

Navas

Buckley

et al. 2016

Journal of Shellfish Research

Self Cite

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“…Furthermore, extended larval competency periods of red abalone have been seen at an ambient temperature of 14°C (Table 1; McCormick et al 2012).…”

Section: Oceanographic Influences On Early Recruitmentmentioning

confidence: 96%

Evaluating Recruitment Seasonality of Red Abalone (Haliotis rufescens) to Inform Fisheries Management and Conservation Policy

Hart¹

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Evaluating Recruitment Seasonality of Red Abalone (Haliotis rufescens) to Inform Fisheries Management and Conservation Policy Leslie Christine Hart Recruitment, the addition of new individuals to a population, must be understood to make predictions about population growth of marine invertebrates. Red abalone (Haliotis rufescens) represent a former important commercial fishery in California, and until recently, supported a major recreational fishery. However, there have been statewide declines since the 1960s due to overfishing, disease, and climatic factors. Thus, understanding population dynamics to inform management and population restoration is critical. Recruitment dynamics of red abalone are poorly understood, with no prior knowledge of seasonal trends. To address this knowledge gap, I assessed monthly (July 2016-June 2017) and annual (2012-2016) settlement rates of red abalone in the Monterey Bay, which has low density abalone populations due to sea otter predation. I evaluated associations between abalone recruitment and oceanographic factors (temperature, wave forces, and upwelling index) and food availability (kelp density) to understand potential predictors of recruitment. Abalone recruitment occurred year round, with generally higher recruitment in late summer to early fall (July-October) and peaks in August and October. This is the first demonstration of year-round abalone recruitment in the field. On a monthly basis, there were no statistically significant relationships between recruitment and oceanographic factors or food availability. Annual abalone recruitment was consistent in all years, with the exception of 2015 when recruitment majorly decreased during the second year of the North Pacific marine heatwave (i.e., warm blob and El Niño v Southern Oscillation (ENSO) events). The failure of recruitment during only the second year of warm temperature suggests that prolonged extreme temperatures lead to reproductive failure. The consistent annual recruitment in the Monterey Bay contrasts with sporadic recruitment observed in Sonoma and Mendocino Counties in northern California. This finding was unexpected because red abalone in northern California were twice as dense as those in Monterey Bay at the time of the study. Possible hypotheses behind the observed consistent recruitment in Monterey Bay despite low densities include that: sheltered embayments retain larvae and promote recruitment, predation by sea otters aggregates abalone in crevices and promotes fertilization success, and the perennially present Macrocystis pyrifera kelp forests better support abalone growth and fecundity than northern California forests dominated by annual Nereocystis leutkeana.

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Endangered Pinto/Northern Abalone (Haliotis kamtschatkana) are Panmictic Across Their 3700 km Range Along the Pacific Coast of North America

Dimond,

Bouma,

Lafarga‐De la Cruz

et al. 2024

Evolutionary Applications

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Connectivity is integral to the dynamics of metapopulations through dispersal and gene flow, and understanding these processes is essential for guiding conservation efforts. Abalone, broadcast‐spawning marine snails associated with shallow rocky habitats, have experienced widespread declines, and all seven North American species are threatened. We investigated the connectivity and population genomics of pinto/northern abalone (Haliotis kamtschatkana), the widest‐ranging of abalone species. We employed reduced representation sequencing (RADseq) to generate single nucleotide polymorphism (SNP) data, assessing population connectivity and potential adaptive variation at 12 locations across the full range from Alaska to Mexico. Despite depleted populations, our analysis of over 6000 SNPs across nearly 300 individuals revealed that pinto abalone maintains a high genetic diversity with no evidence of a genetic bottleneck. Neutral population structure and isolation by distance were extremely weak, indicating panmixia across the species' range (global FST = 0.0021). Phylogenetic analysis, principal components analysis, and unsupervised clustering methods all supported a single genetic population. However, slight population differentiation was noted in the Salish Sea and Inside Passage regions, with evidence for higher barriers to dispersal relative to outer coastal areas. This north‐central region may also represent the species' ancestral range based on relatively low population‐specific FST values; the northern and southern extremes of the range likely represent range expansions. Outlier analysis did not identify consensus loci implicated in adaptive variation, suggesting limited adaptive differentiation. Our study sheds light on the evolutionary history and contemporary gene flow of this threatened species, providing key insights for conservation strategies, particularly in sourcing broodstock for ongoing restoration efforts.

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Larval Competency of Red Abalone (Haliotis rufescens): A New Timeframe for Larval Distribution.

Cited by 5 publications

References 20 publications

Effect of Temperature, Diet, Light, and Cultivation Density on Growth and Survival of Larval and Juvenile White AbaloneHaliotis sorenseni(Bartsch, 1940)

Effect of Temperature, Diet, Light, and Cultivation Density on Growth and Survival of Larval and Juvenile White AbaloneHaliotis sorenseni(Bartsch, 1940)

Evaluating Recruitment Seasonality of Red Abalone (Haliotis rufescens) to Inform Fisheries Management and Conservation Policy

Endangered Pinto/Northern Abalone (Haliotis kamtschatkana) are Panmictic Across Their 3700 km Range Along the Pacific Coast of North America

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