Eggs and larvae of anchoveta Engraulis ringens off northern Chile during the 1997-1998 El Niño event

Rojas, Pablo; Landaeta, Mauricio F.; Ulloa, Raúl

doi:10.4067/s0718-19572011000300010

Cited by 6 publications

(5 citation statements)

References 43 publications

(8 reference statements)

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“…The area of Mejillones Bay (23°29'S, 70º59'W), northern Chile (coastal zone of the Atacama Desert), is an upwelling centre situated in a transition zone between southward flowing equatorial waters and northward flowing subantarctic waters, (Strub et al, 1998;Rojas et al, 2011). Has a relatively homogenous topography with a length of 37 km and a 15 km wide continental shelf.…”

Section: Study Areamentioning

confidence: 99%

Fish larvae retention linked to abrupt bathymetry at Mejillones Bay (northern Chile) during coastal upwelling events

Rojas¹,

Landaeta²

2014

lajar

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ABSTRACT. The influence of oceanic circulation and bathymetry on the fish larvae retention inside Mejillones Bay, northern Chile, was examined. Fish larvae were collected during two coastal upwelling events in November 1999 and January 2000. An elevated fish larvae accumulation was found near an oceanic front and a zone of low-speed currents. Three groups of fish larvae were identified: the coastal species (Engraulis ringens and Sardinops sagax), associated with high chlorophyll-a levels; larvae from the families Phosichthyidae (Vinciguerria lucetia) and Myctophidae (Diogenichthys laternatus and Triphoturus oculeus), associated with the thermocline (12°C), and finally, larvae of the families Myctophidae (Diogenichthys atlanticus) and Bathylagidae (Bathylagus nigrigenys), associated with high values of temperature and salinity. The presence of a seamount and submarine canyon inside Mejillones Bay appears to play an important role in the circulation during seasonal upwelling events. We propose a conceptual model of circulation and particles retention into Mejillones Bay. The assumption is that during strong upwelling conditions the flows that move along the canyon emerge in the centre of Mejillones Bay, producing a fish larvae retention zone. Understanding the biophysical interactions responsible to trap and/or concentrate particles is essential to protect these fragile upwelling ecosystems.

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Section: Study Areamentioning

confidence: 99%

Fish larvae retention linked to abrupt bathymetry at Mejillones Bay (northern Chile) during coastal upwelling events

Rojas¹,

Landaeta²

2014

lajar

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“…Changes in sea surface temperature, wind condition, sea front formation, and the extension and seasonality of ice, may directly affect the composition and phenology of primary producers, as well as primary productivity (Constable et al, 2014; Racault et al, 2017; Soppa et al, 2016). These shifts in basal trophic levels may spread throughout the food web, indirectly affecting the survival, growth, reproductive success, and distribution of species that occupy intermediate and upper trophic levels (Díaz & Ortlieb, 1993; Learmonth et al, 2006; Paredes et al, 2004; Rojas et al, 2011; Waluda et al, 1999). Marine mammals, particularly species that occupy upper trophic levels, have shown sensitivity to climate changes, making them some of the best sentinels of the oceanic and coastal environments (Constable et al, 2014; Moore, 2008; Sergio et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Climate anomalies influence tooth growth patterns of South American sea lions

Heredia

Drouville

Srur

et al. 2021

Marine Mammal Science

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El Niño-Southern Oscillation (ENSO) and Southern Annular Mode (SAM) indirectly affect tooth growth of marine mammals, through changes in prey abundance, availability, and composition. This is reflected as variation in the dentine deposition, which determines the formation of annual layers, called growth layer groups (GLGs). The aim of this work was to study potential effects of ENSO and SAM on South American sea lion (Otaria byronia) of Patagonia, by examining interannual variability of GLG width. Adapting dendrochronological techniques, we analyzed 97 individuals (60 females and 37 males) and built six chronologies (three for each sex) by using cubic splines with different rigidity.Chronologies were correlated with MEI (Multivariate ENSO Index) and SAM index time series, considering lags in the biological response. The chronologies of females spanned 39 years and only two of these chronologies showed negative correlation with 1 year lagged SAM events. The chronologies of males spanned 23 years, but none showed significant correlation with these indexes. Our results did not indicate any ENSO effects on this species, while positive SAM events could reduce the abundance or availability of South American sea lion's prey, affecting the nutritional status of females and generating thinner GLGs during the next year.

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“…The variability in the distribution and abundance of eggs and larvae in the ocean is determined by several environmental factors, which together with the reproductive behavior of adults determine growth and survival of the early life stages (Bustos, Landaeta, & Balbontín, ; Landaeta, Schrebler, Bustos, Letelier, & Balbontín, ). Many oceanographic processes occur in northern Chile, the variations of which can affect the distribution and abundance of ichthyoplankton, and the intrusion of subtropical water masses close to the coast determine differences in primary productivity and the replacement of zooplankton species (Iriarte & González, ; Rojas et al, ). On the other hand, the currents and topography of the coast can generate larval transport and retention in areas that are favorable for their survival (Landaeta & Castro, ; Rojas & Landaeta, ).…”

Section: Introductionmentioning

confidence: 99%

“…Also, the upwelling zone in northern Chile is subject to a strong interannual variability, as a result of El Niño Southern Oscillation (ENSO) events, which frequently and with variable duration, generate increases of warm water and high salinity flow southward and toward the surface, increasing the SST and sea surface height, reducing dissolved oxygen, and deepening the thermocline and nutricline. This increase of the mixing layer involves the reduction of primary production and of all higher trophic levels (Blanco, Carr, Thomas, & Strub, 2002), disturbing the normal distribution of eggs and larvae in plankton (González et al, 1998;Rojas, Landaeta, & Ulloa, 2011;Sánchez, Avalos, Rentería, & Shirasago, 2004;Yáñez, Barbieri, Silva, Nieto, & Espíndola, 2001).…”

mentioning

confidence: 99%

“…Many oceanographic processes occur in northern Chile, the variations of which can affect the distribution and abundance of ichthyoplankton, and the intrusion of subtropical water masses close to the coast determine differences in primary productivity and the replacement of zooplankton species (Iriarte & González, 2004;Rojas et al, 2011). On the other hand, the currents and topography of the coast can generate larval transport and retention in areas that are favorable for their survival (Landaeta & Castro, 2006;Rojas & Landaeta, 2014).…”

mentioning

confidence: 99%

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Subtropical water influences temporal fluctuations of early life stages of Vinciguerria lucetia (Osteichthyes: Phosichthyidae) in the Humboldt Current System (1998–2004)

Lemus

Landaeta

Balbontín

et al. 2019

Fisheries Oceanography

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In the last decades, the fish Vinciguerria lucetia (Garman) has been of important interest to the fisheries sector; nonetheless, the spawning and nursery zones in the Humboldt Current System (HCS) have not yet been defined. By using a temporal series of 23 oceanographic surveys from austral spring of 1998 to autumn 2004 off northern Chile, the spatial and temporal distribution and abundance of eggs and larvae of V. lucetia were studied. The relationships with environmental conditions (sea surface temperature, water column stratification, salinity, dissolved oxygen) were modeled using generalized additive models (GAMs). Seasonal variations in eggs and larval abundances were recorded, and higher abundances were observed in spring and summer, respectively. The main spawning areas were located at approximately between 40 and 80 nautical miles offshore. The largest abundances of V. lucetia eggs were found during spring 2003; however, larval abundances reached the highest values following the strongest ENSO event 1997–98. GAMs predicted that offshore location, sea surface temperature, and the deepening of the oxygen minimum zone, characteristics of the subtropical waters (22–24°C, >34.9, 3–6 ml/L) drove eggs and larval distributions of V. lucetia in the HCS during 1998–2004, toward areas with scarce food availability for larvae. These results suggest that spawning and larval development of this oceanic species occur in oligotrophic waters as a loophole strategy, in order to reduce predation risk during early life stages.

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Eggs and larvae of anchoveta Engraulis ringens off northern Chile during the 1997-1998 El Niño event

Cited by 6 publications

References 43 publications

Fish larvae retention linked to abrupt bathymetry at Mejillones Bay (northern Chile) during coastal upwelling events

Fish larvae retention linked to abrupt bathymetry at Mejillones Bay (northern Chile) during coastal upwelling events

Climate anomalies influence tooth growth patterns of South American sea lions

Subtropical water influences temporal fluctuations of early life stages of Vinciguerria lucetia (Osteichthyes: Phosichthyidae) in the Humboldt Current System (1998–2004)

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