Indications of Offshore Spawning by Southern Gulf of Maine Winter Flounder

Fairchild, Elizabeth A.

doi:10.1080/19425120.2017.1365786

Cited by 8 publications

(1 citation statement)

References 23 publications

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“…Pseudopleuronectes americanus (Walbaum), the winter flounder, is a good candidate for detecting population regulation. Winter flounder spawn in shallow bays, estuaries, and the coastal ocean (Pereira et al 1999;Fairchild et al 2013;Fairchild 2017;Siskey et al 2020) and tagging studies have shown that adult flounder exhibit fidelity to spawning areas (Saila 1961).…”

Section: Introductionmentioning

confidence: 99%

Detecting population regulation of winter flounder from noisy data

Langan

Collie

Minto

2022

Can. J. Fish. Aquat. Sci.

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Year-class size of marine fish is thought to be determined during the first year of life, with density-dependent mortality during the larval or juvenile stages. However, investigations of such dynamics are often limited by data availability. To test this paradigm for winter flounder (Pseudopleuronectes americanus) in Narragansett Bay, Rhode Island, the abundances of 29 year classes moving through seven life stages were analyzed with a novel extension of key-factor analysis. Evidence of density dependence was identified between the egg and July young-of-the-year stages and high process-error variance was detected throughout the life cycle, suggesting year-class size is not fully determined until age-2. However, the first summer appeared to be a critical life stage for winter flounder, during which high temperatures, hypoxia, and predator abundance contributed to increased mortality rates behind a long-term population decline. Due to its general data requirements, the key-factor analysis method developed here may be applied to other marine populations to identify the impacts of external stressors at particular life stages and the degree to which they are compensated by density-dependent processes.

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Section: Introductionmentioning

confidence: 99%

Detecting population regulation of winter flounder from noisy data

Langan

Collie

Minto

2022

Can. J. Fish. Aquat. Sci.

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Winter Flounder Navigate the Postsettlement Gauntlet with a Bet‐Hedging Strategy

et al. 2021

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Winter Flounder Pseudopleuronectes americanus, a coastal flatfish species of historically economic and cultural importance, have declined throughout the past few decades within the southern New England and mid-Atlantic region of the United States, reaching a low point of less than 9% of their historic biomass in 2009. Unusually high postsettlement mortality is thought to impose a critical recruitment bottleneck on the population, potentially stalling recovery of Winter Flounder populations despite management measures. Survival and growth during early life history play a key role in the recruitment dynamics of marine fishes. Spatiotemporal differences in these vital rates from young-ofthe-year (i.e., age-0) Winter Flounder have been variously linked to environmental gradients, anthropogenic stressors, differences in the timing of settlement, and location. To better understand local declines in recruitment productivity, we assessed vital rates of age-0 Winter Flounder in five different bays in Long Island, New York. A weekly or biweekly beam-trawl survey targeting age-0 Winter Flounder was implemented over five summers. We compared survey-based estimates of age-0 mortality and growth, finding significant differences between locations in growth but not mortality. A consistently high abundance of age-0 Winter Flounder in Shinnecock Bay and Mattituck Creek was prolonged by a secondary settlement pulse later in the season. Hypothesizing that multiple settlement pulses are a bet-hedging strategy against temporally varying environmental conditions, we compared mortality, growth, and occupied habitat conditions between settlement pulses (cohorts), finding differences in growth and habitat occupancy that varied across years.

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The Relative Influence of Age Structure, Predation, and Temperature on Stock–Recruitment Dynamics: A Case Study of Southern New England/Mid‐Atlantic Winter Flounder

Siskey

Frisk

2021

Mar Coast Fish

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Stock size estimates used in stock-recruitment models often assume that reproductive output per individual is equal despite evidence that larger, older spawners contribute diverse spawning behaviors and disproportionately more to reproductive output. This is concerning since depleted population states often coincide with a compromised age structure and increased control of extrinsic forces (environmental conditions or predator-prey dynamics) on stock productivity. In this study, parameterizations of the stock-recruitment relationship for Winter Flounder Pseudopleuronectes americanus, which incorporated covariate metrics describing age structure, temperature, and predation, were compared to identify primary drivers across area-specific data sets that are included in recent regional stock assessments. Four of the six data sets resulted in a top-ranked model that incorporated an age structure metric; however, the age structure metric model was alone in the pool of top-ranked models for only two of these scenarios. In addition, one data set resulted in a base Ricker model, and one resulted in a model that incorporated a predator index. Finally, wavelet analysis identified significant coherence between fishing mortality rate (F) and spawning stock biomass (SSB) for Winter Flounder, which switched from an out-of-phase state to an in-phase state during the 1990s. If the relationship between these model-derived estimates of F and SSB reflects dynamics of the Winter Flounder population, it would have strong implications for management efforts.

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Indications of Offshore Spawning by Southern Gulf of Maine Winter Flounder

Cited by 8 publications

References 23 publications

Detecting population regulation of winter flounder from noisy data

Detecting population regulation of winter flounder from noisy data

Winter Flounder Navigate the Postsettlement Gauntlet with a Bet‐Hedging Strategy

The Relative Influence of Age Structure, Predation, and Temperature on Stock–Recruitment Dynamics: A Case Study of Southern New England/Mid‐Atlantic Winter Flounder

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