The Humboldt Current System of Northern and Central Chile

Thiel, Martín; Macaya, Erasmo C.; Acu√±a, Enzo; Arntz, Wolf; Bastias, Horacio; Brokordt, Katherina; Camus, Patricio A.; Castilla, Juan Carlos; Castro, Leonardo R.; Cort√©s, Maritza; Dumont, Clément P.; Escribano, Rubén; Fernández, Miriam; Gajardo, Jhon; Gaymer, Carlos F.; Gómez, Iván; Gonz√°lez, Andr√©s; Gonz√°lez, Humberto; Haye, Pilar A.; Illanes, Juan-Enrique; Iriarte, José; Lancellotti, Domingo; Luna‐Jorquera, Guillermo; Luxoro, Carolina; Manríquez, Patricio H.; Mar√≠n, V√≠ctor; Mu√±oz, Praxedes; Navarrete, Sergio A.; Pérez, Eduardo A.; Poulin, Élie; Sellanes, Javier; Sep√∫lveda, Hector; Stotz, Wolfgang; Tala, Fadia; Thomas, A. W.; Vargas, Cristian A.; Vásquez, Julio A.; Vega, Alonso

doi:10.1201/9781420050943.ch6

Cited by 390 publications

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“…Interestingly, in that studies, specimens of M. donacium were seen to open their shells a few days before they died, coinciding with observations made under laboratory conditions in the current study. Accordingly, the local extinction of M. donacium described above and the survival of D. obesulus after strong EN was observed repeatedly elsewhere off Peru and northern Chile (Tomicic, 1985;Arntz et al, 1987;Carbajal et al, 1995;Aburto and Stotz, 2003;Quiroz et al, 2006;Thiel et al, 2007;Riascos et al, 2009). A southward extension of the geographic distribution of D. obesulus has been reported following EN warming, enabling this species to temporarily reach as far south as w23 S (Tomicic, 1985;Carbajal et al, 1995), about 800 km south of its current southern distribution limit.…”

Section: Discussionmentioning

confidence: 69%

“…On the other hand, distributional ranges are similar for all species of tropical origin. These molluscs (Table 1) inhabit exclusively the first biogeographical unit (Thiel et al, 2007), reflecting the distributional range of D. obesulus (Thiel et al, 2007; Fig. 1 and Table 1).…”

Section: Discussionmentioning

confidence: 99%

“…Arntz and Fahrbach, 1991;Arntz et al, 2006;Thiel et al, 2007). Table 3 shows changes in abundance reported for several shallow-water molluscs distributed along the HCS (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Unlike other coastal ecosystems at similar latitudes, the HCS exhibits cool, stable temperature conditions throughout the year. According to Thiel et al (2007, Fig. 1), three biogeographical units can be distinguished within the HCS: (i) the first northern unit dominated by subtropical and temperate biota and extending from northern Peru to northern Chile (4e6 S to 30e36 S); (ii) the second southern unit dominated by a subantarctic and temperate biota extending from the Chilean archipelago to the Magellan Province (41e43 S to 54 S); and (iii) in between, a transitional unit characterized by strong numerical reductions in subantarctic and subtropical species at its northern and southern borders respectively (30e36 S to 41e43 S).…”

Section: Introductionmentioning

confidence: 99%

“…Within their distributional range both species are affected differently by extreme phases of ENSO (Soto, 1985;Arntz et al, 1987, 1988, Arntz and Fahrbach, 1991Díaz and Ortlieb, 1993;Thiel et al, 2007). Historically, D. obesulus (synonyms: D. marincovichi and D. peruvianus; Carstensen et al, 2009) was distributed from the Ecuadorian coast (0 26 0 S) to the North of Chile (23 05 0 S) (Coan, 1983; Fig.…”

Section: Introductionmentioning

confidence: 99%

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Recurrent, thermally-induced shifts in species distribution range in the Humboldt current upwelling system

Carstensen¹,

Riascos²,

Heilmayer³

et al. 2010

Marine Environmental Research

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a b s t r a c tEl Niño-Southern Oscillation (ENSO) is a global climate variablility, which fundamentally influences environmental patterns of the Humboldt Current System (HCS) off Chile and Peru. The surf clams Donax obesulus and Mesodesma donacium are dominant and highly productive bivalves of exposed sandy beaches of the HCS. Existing knowledge indicates that El Niño (EN, warm phase of ENSO) and La Niña (LN, cold phase of ENSO) affect populations of both species in a different way, although understanding of the mechanisms underlying these effects is still lacking. The aim of this study was to test hypotheses attempting to explain field observations on the effect of strong EN or LN events by using controlled experimental conditions. Growth and mortality rates of both species were registered during a four-week experiment under EN temperature conditions, normal temperature conditions and LN temperature conditions. While D. obesulus exhibited reduced growth and higher mortality under LN conditions, M. donacium showed reduced growth and higher mortality under EN conditions. The results clearly indicate different temperature tolerance windows for each species, possibly reflecting the evolutionary origins of the Donacidae and Mesodesmatidae in regions with contrasting temperature regimes. These results provide experimental support for previous hypotheses suggesting that thermal tolerance is the driving factor behind observed changes in the species distributions of D. obesulus and M. donacium during the extreme phases of ENSO.

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Section: Discussionmentioning

confidence: 69%

Section: Discussionmentioning

confidence: 99%

“…Arntz and Fahrbach, 1991;Arntz et al, 2006;Thiel et al, 2007). Table 3 shows changes in abundance reported for several shallow-water molluscs distributed along the HCS (Fig.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Recurrent, thermally-induced shifts in species distribution range in the Humboldt current upwelling system

Carstensen¹,

Riascos²,

Heilmayer³

et al. 2010

Marine Environmental Research

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Mesoscale variability in the habitat of the Humboldt Current krill, spring 2007

et al. 2015

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Mesoscale eddies are prominent structures in the world's oceans generating a high degree of spatial and temporal heterogeneity that influences zooplankton distribution. Euphausiids (krill) are a key zooplankton group mainly inhabiting coastal upwelling areas where high productivity, advection, and eddy kinetic energy (EKE) play pivotal roles in the distribution and structure of zooplankton. We analyzed the spatial distribution of the Humboldt Current krill, Euphausia mucronata, in relation to environmental variability and mesoscale circulation during the 2007 austral spring. Using net-based zooplankton samples, remotely sensed environmental conditions, multivariate analysis, and generalized additive models, we described and tested the effect of oceanographic variability and mesoscale eddies on E. mucronata abundance and biomass. E. mucronata was significantly more abundant in coastal (97%) than oceanic habitats, and more abundant in cyclonic cores (mean: 76 indiv. m 22 ) than in surrounding waters (mean: 13-29 indiv. m 22 ).Abundance correlated to current and EKE fields at >10-20 cm s 21 and >50-200 cm 2 s 22 , respectively, and biomass correlated negatively to sea level anomaly and positively to alongshore winds. Krill abundance and biomass were also strongly coupled to both eddy dynamics and the coastal upwelling regime in spring 2007. Mesoscale eddies may doubly influence the E. mucronata population dynamic by retaining krill within them and, by advection from coastal to oligotrophic regions.

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