Variabilidad espacial y temporal de huevos y larvas de Strangomera bentincki y Engraulis ringens, asociados a la desembocadura del río Itata, Chile

Soto-Mendoza, Samuel; Castro, Leonardo R.; Llanos-Rivera, Alejandra

doi:10.4067/s0718-19572010000300012

Cited by 13 publications

(7 citation statements)

References 22 publications

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“…It seems plausible that ectoparasite infestation might increase in locations with these oceanographic conditions. Nearshore environments of central Chile are characterized by intrusion of river plumes (Soto-Mendoza et al 2010), which produces large turbidity in the system (Saldías et al 2012), affecting the accumulation of meroplankton in the inner shelf (Vargas et al 2006). Additionally, alongshore variation in upwelling intensity and the formation of warmwater pockets or upwelling shadows in sections of the coast (Wieters et al 2003) may increase coastal retention of fish larvae and ectoparasite infestation.…”

Section: Discussionmentioning

confidence: 99%

Spatial and temporal variations of coastal fish larvae, ectoparasites and oceanographic conditions off central Chile

Landaeta¹,

Zavala-Muñoz²,

Palacios-Fuentes

et al. 2015

Rev. biol. mar. oceanogr.

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Resumen.-El objetivo de este estudio fue determinar la variación temporal de las condiciones oceanográficas, ictioplancton y sus ectoparásitos en aguas costeras marinas. Se realizaron 30 muestreos de ictioplancton entre el 11 de octubre 2012 y el 5 de junio 2014 a lo largo de una transecta desde 0,25 km hasta 4,5 km de la costa frente a Montemar, Bahía Valparaíso, Chile central. Se identificó un total de 5.553 larvas de peces, pertenecientes a 37 taxa. Las larvas de peces más abundantes originadas de desove pelágico fueron la sardina común Strangomera bentincki (abundancia relativa= 26,39%), anchoveta Engraulis ringens (8,94%), y el mictófido Hygophum bruuni (7,72%); las especies más abundantes originadas de posturas bentónicas fueron la borrachilla Scartichthys viridis (15,77%), el cachudito Hypsoblennius sordidus (8,27%) y el pejesapo Gobiesox marmoratus (7,06%). Las larvas de peces más parasitadas provinieron de posturas bentónicas, los pejesapos G. marmoratus (prevalencia= 9,63%) y Sicyases sanguineus (0,54%), el tomollo Auchenionchus variolosus (1,72%), y el trombollito de tres aletas Helcogrammoides cunninghami (3,28%). La única especie con desove pelágico que presentó ectoparásitos fue el blanquillo Prolatilus jugularis (0,57%). Las larvas de peces con ectoparásitos mostraron una disminución en abundancia con la distancia a la costa; S. bentincki, H. bruuni (desove pelágico) o S. viridis (postura bentónica) fueron más abundantes a 2,0 km de la costa. Los ectoparásitos fueron identificados como Trifur spp. (Copepoda: Pennellidae) y Caligus spp. (Copepoda: Caligidae), siendo los penélidos los más frecuentes (1 a 3 parásitos por larva). El 94 y 88% de los penélidos y calígidos, respectivamente, fue recolectado en la estación más costera. Durante los periodos de mayor prevalencia de ectoparásitos en las larvas de peces, el agua de mar estuvo verticalmente estratificada con una profundización a fines de otoño y un ascenso en verano de la picnoclina desde mar afuera hacia la costa. Por lo tanto, los resultados sugieren que las larvas de peces originadas de posturas bentónicas son parasitadas más frecuentemente y que las condiciones físicas de la columna de agua pueden favorecer tanto la retención costera como la infestación por ectoparásitos en las aguas más cercanas a la costa.Palabras clave: Trifur sp., Caligus sp., pejesapo, gradientes horizontales de densidad, Chile central, SudaméricaAbstract.-The objective of this study is to determine the temporal variation of oceanographic conditions, ichthyoplankton and their ectoparasites in nearshore marine waters. From October 11 th 2012 to June 5 th 2014, 30 ichthyoplankton surveys were carried out along a cross-shelf transect from 0.25 km of the coastline to 4.50 km offshore off Montemar, Bahía Valparaíso, central Chile. We identified a total of 5,553 fish larvae, belonging to 37 taxa. The most abundant fish larvae with pelagic spawning were the common sardine Strangomera bentincki (relative abundance= 26.39%), the anchoveta Engraulis ringens (8.94%), and the lant...

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Section: Discussionmentioning

confidence: 99%

Spatial and temporal variations of coastal fish larvae, ectoparasites and oceanographic conditions off central Chile

Landaeta¹,

Zavala-Muñoz²,

Palacios-Fuentes

et al. 2015

Rev. biol. mar. oceanogr.

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“…Studies about larval anchoveta development have been conducted mostly in south‐central Chile and along Peruvian shores (Bustos, Landaeta, & Balbontín, ; Castro & Hernández, ; Castro et al., ; Cubillos et al., ; Hernández & Castro, ; Landaeta & Castro, ; Landaeta, Ochoa‐Muñoz, & Bustos, ; Lett, Penven, Ayón, & Freón, ; Soto‐Mendoza, Castro, & Llanos‐Rivera, ). Nevertheless, in northern Chile (Moreno, Claramunt, & Castro, ), which is an area characterized by coastal upwelling throughout the year, there have been few studies aimed at analyzing the early life history of this species and its relation to oceanographic dynamics.…”

Section: Introductionmentioning

confidence: 99%

Growth and mortality of larval anchoveta Engraulis ringens, in northern Chile during winter and their relationship with coastal hydrographic conditions

Contreras

Rodríguez-Valentino

Landaeta

et al. 2017

Fisheries Oceanography

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Larval growth, age, growth effect and instantaneous mortality were estimated in anchoveta, Engraulis ringens, collected biweekly during the austral winter of 2014 in nearshore waters off Bay of Antofagasta (23°41′W–70°30′S), northern Chile. Through measuring standard length (SL) and sagitta microstructure analysis, it was estimated that the growth rate of E. ringens larvae decreased from June (0.85 mm day−1) to August (0.50 mm day−1). However, the water temperature was homogeneous during the sampling dates (14.6, 15.2, 14.4, and 14.6°C), suggesting that the decelerating larval growth was not linked to changes in sea temperature. Additionally, larvae with slow growth have larger otoliths compared with conspecifics with fast growth (growth effect). Larval mortality rates tended to decrease until the middle of July (0.18 per day) but increased to 0.25 per day in early August, which coincided with lower food availability (i.e., chlorophyll‐a, 2.7–5.6 mg m−3) and a high occurrence of smaller larvae (1.58–11.5 mm). Partial least squares analysis indicates low covariance between the biological and oceanographic variables (PLS: 11.71%), suggesting that other factors, such as parental effects, may explain the abrupt decrease in the larval growth rates.

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“…Changes to river runoff timing may modify the division of the annual biological cycle as observed by cluster analysis. A potential variation in basal productivity magnitude and timing in river-influenced zones over the continental shelf plays a fundamental ecological role, as a greater abundance of E. ringens and Strangomera bentincki in early life stages (eggs and larvae) was observed during this season and at salinities between 32 and 34 (Soto-Mendoza et al, 2010). Additionally, increased stratification of the water column may favor a greater downward carbon flux (605 mg C m −2 d −1 ) as compared to other periods of the year (between 152 and 268 mg C m −2 d −1 ; Vargas et al, 2007).…”

Section: Basal Periodmentioning

confidence: 99%

Temporal Variability in Net Primary Production in an Upwelling Area off Central Chile (36°S)

Testa

Masotti

2018

Front. Mar. Sci.

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The temporal variability of Net Primary Production (NPP) off central Chile (36 • S, 73 • W), an area subjected to seasonal coastal upwelling, was analyzed using monthly in situ 13 C incubations within the photic zone, along with bio-oceanographic variables from a fixed time series station; and satellite NPP estimations (NPPE) from the Vertically Generalized Production Model between 2006 and 2015. NPP and NPPE rates varied from 0.03 to 18.29 and from 0.45 to 9.07 g C m −2 d −1 , respectively. Both rates were fairly well correlated with each other (r 2 = 0.61), but when these data were separated into two periods, higher r 2 value was found during winter (r 2 = 0.70) with respect to the rest of the year (r 2 = 0.24); the latter correlation was partially due to increased weekly NPPE variability during active and relaxed upwelling events. NPP rates along with other biophysical variables allowed for a division of the annual cycle into three distinct periods: September to January (high productivity, mean integrated NPP rates of 4.0 g C m −2 d −1 ), February to March (intermediate productivity, mean integrated NPP rates of 1.4 g C m −2 d −1 ), and May to August (basal level, mean integrated NPP rates of 0.5 g C m −2 d −1 ). NPP appeared to be partially controlled by nutrient inputs, either from upwelling (September-April) and river discharge (May-August), maintaining high NPP rates throughout the entire year, with an annual mean NPP rate of 1.1 kg C m −2 yr −1 . In this region, El Niño Southern Oscillation events did not appear to impact the NPP interannual variability.

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Variabilidad espacial y temporal de huevos y larvas de Strangomera bentincki y Engraulis ringens, asociados a la desembocadura del río Itata, Chile

Abstract: Variabilidad espacial y temporal de huevos y larvas de Strangomera bentincki y Engraulis ringens, asociados a la desembocadura del río Itata, Chile Variations in space and time of eggs and larvae of Strangomera bentincki and Engraulis ringens associated to the Itata River mouth, Chile

Cited by 13 publications

References 22 publications

Spatial and temporal variations of coastal fish larvae, ectoparasites and oceanographic conditions off central Chile

Spatial and temporal variations of coastal fish larvae, ectoparasites and oceanographic conditions off central Chile

Growth and mortality of larval anchoveta Engraulis ringens, in northern Chile during winter and their relationship with coastal hydrographic conditions

Temporal Variability in Net Primary Production in an Upwelling Area off Central Chile (36°S)

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