A comparison of long-term trends and variability in populations of larvae of exploited and unexploited fishes in the Southern California region: A community approach

Hsieh, Chih‐hao; Reiss, Christian S.; Watson, William; Allen, Michael J.; Hunter, John; Lea, Robert N.; Rosenblatt, Richard H.; Smith, Paul E.; Sugihara, George

doi:10.1016/j.pocean.2005.05.002

Cited by 91 publications

(104 citation statements)

References 30 publications

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“…In contrast, recruitment research over the last century has had few lengthy time series of observations that quantified variations in growth, mortality, and factors that drive the dynamics of early life stages of fish for many populations and (or) ecosystems. An exception involves the information base available from the California Cooperative Oceanic Fisheries Investigations (CALCOFI) program, which has served to identify important drivers of change in the abundance of several species (Auth and Brodeur 2013;Hsieh et al 2005;Weber and McClatchie 2010). However, most large-scale multidisciplinary research initiatives have often been of limited duration (e.g., <10 years) and designed around the potential benefits of applying comparative studies in a number of regions (e.g., Global Ocean Ecosystem Dynamics (GLOBEC); Lehodey et al 2006;Trenkel et al 2014).…”

Section: Discussionmentioning

confidence: 99%

Reconsidering the impossible — linking environmental drivers to growth, mortality, and recruitment of fish

Pepin

2016

Can. J. Fish. Aquat. Sci.

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After a century of research into the drivers of early life (EL) growth and mortality, fisheries science has acquired limited capacity to predict future recruitment. A meta-analysis of stock assessment time series revealed that it may be difficult to identify stock-or environmental-recruitment drivers given limited variability in spawner biomass, recruitment, and survivorship in most populations. In nearly 50% of the stocks, there was limited information at low spawner biomass, limiting the reliability of fits to stock-recruitment models. Furthermore, variations in survivorship in 50% of year-classes resulted in less than a 2.5-fold change in recruitment. Simulations of three scenarios of change in EL growth and mortality rates demonstrated that they must covary positively to reproduce variations in survivorship consistent with observations. The potentially limited reliability of stock-recruitment relationships to predict year-class strength in many stocks and the low variability in survivorship in a large proportion of year-classes has important implications for the development of projections of stock productivity used in scientific advice. Furthermore, if a positive growth-mortality relationship underlies variations in survivorship, new research approaches are required to understand the trophic relationships that govern the dynamics of early life stages of fish and patterns of recruitment variability.Résumé : Après un siècle de recherche sur les facteurs qui agissent sur la croissance et la mortalité aux stades précoces de la vie (SPV), les sciences halieutiques ont acquis une capacité limitée de prédire le recrutement futur. Une méta-analyse de séries chronologiques d'évaluation des stocks révèle qu'il pourrait être difficile de cerner les facteurs de recrutement associés au stock ou au milieu étant donné la variabilité limitée de la biomasse, du recrutement et de la survie des géniteurs dans la plupart des populations. Pour presque 50 % des stocks, l'information associée à des situations de faible biomasse de géniteurs est limitée, ce qui limite la fiabilité du calage sur des modèles stock-recrutement. En outre, les variations de la survie dans 50 % des classes d'âge se traduisent par des variations du recrutement inférieures à un facteur de 2,5. Des simulations de trois scénarios de changement des taux de croissance et de mortalité aux SPV démontrent que ces taux doivent présenter une covariation positive pour produire des variations de la survie qui concordent avec les observations. La fiabilité potentiellement limitée des relations stock-recrutement pour ce qui est de prédire la force des classes d'âge dans de nombreux stocks et la faible variabilité de la survie dans une grande proportion de classes d'âge ont d'importantes conséquences pour l'élaboration de projections de la productivité des stocks utilisées pour formuler des avis scientifiques. En outre, si une relation croissance-mortalité positive sous-tend les variations de la survie, de nouvelles approches de recherche sont nécessaires pour...

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Section: Discussionmentioning

confidence: 99%

Reconsidering the impossible — linking environmental drivers to growth, mortality, and recruitment of fish

Pepin

2016

Can. J. Fish. Aquat. Sci.

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“…Por el contrario, en años La Niña, las tasas de supervivencia pueden ser comparativamente bajas, pero con un aumento en el transporte de la CC y en la biomasa de plancton (Sinclair et al 1985). No obstante, las densidades larvales de esta especie han disminuido desde mediados de la década de los 80's y hasta el 2000, aunque se considera que esta tendencia puede continuar (Hsieh et al 2005, Lo et al 2010). …”

Section: Introductionunclassified

Identificación de zonas propicias para el desarrollo larval de la macarela del Pacífico (Scomber japonicus) en la porción sur de la Corriente de California

Anaya-Godinez

Funes-Rodrı́guez

Hinojosa‐Medina

et al. 2019

Rev. biol. mar. oceanogr.

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Abstract.-Larval size is considered as an important variable to understand the changes in larval development and identification of a suitable environment for larval growth and survivor. Larvae of the Pacific mackerel (Scomber japonicus) have a slow growth during the early stages of development (6-8 mm SL); subsequently, the growth rate increases, but the development depends mainly on the temperature and food. The aim of this study was to identify the areas and seasons favorable for larval development of S. japonicus, in relation to the sea surface temperature and the zooplankton biomass, off the west coast of the Baja California Peninsula (~25°-32°N) from 2006 to 2010. Larvae of the Pacific mackerel showed the greatest amplitude in their spatial distribution during spring, but with greater restricted abundance compared to Punta Eugenia (~28°N) during summer. Changes in its distribution were influenced by geostrophic flow and thermal variability. Linear regression analysis allowed to identify areas favorable for larvae development, with a lower development in spring, related to a narrow range of temperatures and levels of comparatively low zooplankton biomass. In contrast, during summer the largest increase in body height () was related to a wide range of temperatures, while its low variability (standard error) coincided with high levels of zooplankton biomass. It is considered that thermal conditions and food availability, favor an optimum larval development, particularly during the summer season.Key words: Pacific mackerel, fish larvae, isometric growth, suitable areas, California CurrentResumen.-El tamaño larval es una variable importante para entender los cambios en el desarrollo y la identificación de un entorno adecuado para el crecimiento y la supervivencia larval. Las larvas de la macarela del Pacífico (Scomber japonicus) presentan un lento crecimiento durante las primeras fases del desarrollo (6-8 mm de LE); posteriormente, la velocidad de crecimiento aumenta, pero el desarrollo depende principalmente de la temperatura y del alimento. El objetivo del presente trabajo fue identificar las zonas y temporadas propicias para el desarrollo larval de S. japonicus, en relación a la temperatura superficial del mar y la biomasa del zooplancton, frente a la costa occidental de la Península de Baja California (~25-32°N) del 2006 al 2010. Las larvas de la macarela del Pacífico mostraron la mayor amplitud en su distribución espacial en primavera, pero con mayor abundancia restringida frente a Punta Eugenia (~28°N) durante el verano. Los cambios en su distribución, estuvieron bajo la influencia del flujo geostrófico y la variabilidad térmica. El análisis de regresión lineal permitió identificar zonas propicias para el desarrollo de larvas, con un menor desarrollo en primavera, relacionado con un int ervalo estrecho de temperaturas y niveles de biomasas del zooplancton comparativamente bajos. En contraste, durante el verano el mayor incremento en la altura del cuerpo () fue relacionado con un amplio intervalo de tempe...

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“…Their abundance is generally considered to provide an index of adult spawning biomass, even though the effects of variable reproductive output, predation during the early life history and other factors are not accounted for (Moser 1996, Hsieh et al 2005. For example, in the CalCOFI ichthyo plankton data set the abundances of northern an chovy Engraulis mordax and Pacific sardine Sar dinops sagax eggs and larvae, the key species for which formal stock assessments have been carried out, are highly correlated with assessments of their spawning stock biomass (Table 1).…”

Section: Introductionmentioning

confidence: 99%

Impact of declining intermediate-water oxygen on deepwater fishes in the California Current

Koslow¹,

Goericke²,

Lara‐Lopez³

et al. 2011

Mar. Ecol. Prog. Ser.

179

188

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Although declining oxygen concentration has been reported for the oxygen minimum zones (OMZs) of the tropical oceans and the North Pacific Ocean, consistent with model predictions of the effects of global warming, its ecological impacts are poorly understood. We report the apparent impact of declining oxygen on midwater fishes within the OMZ of the southern California Current (CC). Principal component analysis of the California Cooperative Oceanic Fisheries Investigations (CalCOFI) ichthyoplankton time series from 1951 to 2008 indicates that the dominant temporal pattern (principal component 1 [PC1]) represents the marked decline of the region's mesopelagic fishes during periods of reduced oxygen. Of the 27 taxa with loadings > 0.5 on PC1, 24 were mesopelagic. PC1 was strongly correlated with intermediate-water oxygen concentrations (r = 0.75, p < 0.05), which were about 20% lower in the past decade and the 1950s than in the period from 1970 to 1995. The abundance of mesopelagic fishes represented by PC1 was reduced, on average, by 63% between periods of high and low oxygen concentrations. We hypothesize that the underlying mechanism is the shoaling of the hypoxic boundary layer during periods of reduced oxygen, which renders the mesopelagic fauna more vulnerable to visually orienting predators. The mesopelagic fish fauna provides a vital trophodynamic link between the marine plankton and many higher predators. The decline of deepwater fish populations has profound implications for commercial fisheries, marine food webs and marine conservation: climate models predict a 20 to 40% decline in global deepwater oxygen concentrations over the coming century.KEY WORDS: Oxygen · Mesopelagic fishes · Oxygen-minimum zone · Climate change · California CurrentResale or republication not permitted without written consent of the publisher

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A comparison of long-term trends and variability in populations of larvae of exploited and unexploited fishes in the Southern California region: A community approach

Cited by 91 publications

References 30 publications

Reconsidering the impossible — linking environmental drivers to growth, mortality, and recruitment of fish

Reconsidering the impossible — linking environmental drivers to growth, mortality, and recruitment of fish

Identificación de zonas propicias para el desarrollo larval de la macarela del Pacífico (Scomber japonicus) en la porción sur de la Corriente de California

Impact of declining intermediate-water oxygen on deepwater fishes in the California Current

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