Analysis of the mesoscale structure in the IMECOCAL region (off Baja California) from hydrographic, ADCP and altimetry data

Soto-Mardones, Luis; Parés‐Sierra, Alejandro; García, J.; Durazo, Reginaldo; Hormazábal, Samuel

doi:10.1016/j.dsr2.2004.05.024

Cited by 48 publications

(53 citation statements)

References 25 publications

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“…La presencia de remolinos anticiclónicos semipermanentes es evidente en los patrones de circulación superficial durante todo el año, excepto en otoño, de igual manera se observan estructuras de meandros al sureste de Isla Guadalupe (mejor definida en verano) y frente a Punta Eugenia (Soto-Mardones et al 2004, Durazo et al 2010. La importancia de estas estructuras de circulación, es que interrumpen la interconexión hidrodinámica entre las regiones norte y sur del área de estudio, interrupción que puede tener consecuencias notables en el transporte meridional de poblaciones biológicas (Durazo et al 2010).…”

Section: áRea De Estudiounclassified

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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Section: áRea De Estudiounclassified

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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“…The DA concentration in waters of the Baja California west coast has not been monitored. This region is part of California Current System and presents prominent oceanographic mesoscale structures such as meanders, eddies, filaments (Soto-Mardones et al, 2004) and strong upwelling events along the coastline (Espinosa-Carreó n et al, 2004). These oceanographic features have been associated with the blooming of toxic species in northern regions Trainer et al, 2000;Taylor and Trainer, 2002;Anderson et al, 2006).…”

Section: Introductionmentioning

confidence: 97%

A toxic Pseudo-nitzschia bloom in Todos Santos Bay, northwestern Baja California, Mexico

et al. 2009

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“…The anticyclonic eddy observed off Baja California in April 2005 has a different origin, being formed within offshore equatorial waters, remaining to the west of the CC flow, and maintaining a minor but diverse amphipod tropical assemblage. This is a recurrent anticyclone, and its formation has been explained by the geometry of the coastline (Soto-Mardones et al 2004). This anticyclone could prevent the propagation of tropical species toward the coast when the CC is strong, as suggested by the present analysis.…”

Section: Amphipod Assemblages and Mesoscale Structuresmentioning

confidence: 99%

Seasonal variation in hyperiid amphipod abundance and diversity and influence of mesoscale structures off Baja California

Lavaniegos

Hereu²

2009

Mar. Ecol. Prog. Ser.

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Hyperiid amphipods collected during 4 IMECOCAL (Spanish acronym for Mexican Investigations of the California Current) cruises in January, April, July, and October 2005 were analyzed for seasonal variation in abundance and diversity and to determine the influence of surface circulation. The number of species was high in all seasons (between 79 and 92), but abundances showed remarkable differences. The total number of amphipods was lowest in January and highest in October (geometric means were 82 and 606 ind. 1000 m -3 respectively). Multivariate analysis based on similarity indices demonstrated a tight coupling between species composition and mesoscale structures. The largest cluster joined 67 stations, with 40% of similarity being explained by 4 species (Vibilia armata, Lestrigonus schizogeneios, Eupronoe minuta, and Primno brevidens). The geographic position of these stations coincided with the main California Current (CC) flow from spring to autumn. Subgroups were defined by minor seasonal differences. In contrast, the CC flow during winter was reduced to a meander off north Baja California, and was surrounded by oligotrophic water as indicated by the presence of the hyperiids Anchylomera blossevillei and Phrosina semilunata plus 3 of the dominant species (V. armata, E. minuta, and P. brevidens). To the south of this front, other clusters with high oceanic influence were formed. In 2005, 3 eddies were detected in the area: one anticyclonic eddy in April and 2 cyclonic eddies in July. The anticyclonic eddy located in the southwest had its own faunal cluster that had high diversity but low population density. The main species in the anticyclonic eddy was Platyscelus ovoides. Only one of the cyclonic eddies had a unique faunal identity, being strongly dominated by Vibilia armata; this was located in the north between the CC flow and the coast. The other eddy was large and situated in the middle of the area, with a faunal array analogous to that in the CC flow. Correlation between hyperiid and salp species abundances suggested that the increase in salps (Salpa fusiformis, Thalia orientalis, Cyclosalpa bakeri) in spring could be relevant, as many hyperiid species showed a strong increase at this time. However, the most correlated salp was Cyclosalpa danae, which occurred only in October. Chains of C. danae aggregates were firmly attached in the samples. This would promote the aggregation and survival of amphipod hosts, particularly small species such as Lestrigonus schizogenios and L. bengalensis.

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Analysis of the mesoscale structure in the IMECOCAL region (off Baja California) from hydrographic, ADCP and altimetry data

Cited by 48 publications

References 25 publications

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

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

A toxic Pseudo-nitzschia bloom in Todos Santos Bay, northwestern Baja California, Mexico

Seasonal variation in hyperiid amphipod abundance and diversity and influence of mesoscale structures off Baja California

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