Seasonal dynamics of zooplankton in a northern Chile bay exposed to upwelling conditions

Torreblanca, Marcela; Peréz-Santos, Iván; Martín, Bruno San; Varas, Eduardo; Zilleruelo, Rodrigo; Riquelme‐Bugueño, Ramiro; Palma, Álvaro T.

doi:10.4067/s0718-19572016000200006

Cited by 4 publications

(2 citation statements)

References 28 publications

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“…This pressure gradient force drives a poleward current close to the coast into the upwelling region during active wind forcing, and it causes a surge of warm water into the upwelling zone during wind relaxation, as observed by Send et al (1987) and Largier et al (1993). Other studies of upwelling shadows have focused on biological aspects, given the association of this process with high coastal biological activity, including the dynamics of harmful algal blooms (HABs; Graham et al, 1992;Graham & Largier, 1997;Marín et al, 2001;Pitcher et al, 2010;Torreblanca et al, 2016;Schulien et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Surface Thermal Structure and Variability of Upwelling Shadows in the Gulf of Arauco, Chile

et al. 2021

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Enhanced coastal upwelling usually occurs near capes (e.g., Castelao & Barth, 2007), due to vorticity effects along with the acceleration of winds and currents (Largier, 2020). Moreover, the wind shadows and upwelling circulation around capes can also generate upwelling shadows on the side protected from the upwelling jet and alongshore wind. An upwelling shadow has been defined as "a localized region of an active coastal upwelling system within which upwelling is reduced, and a coherent pattern of anomalously high

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Section: Discussionmentioning

confidence: 99%

Surface Thermal Structure and Variability of Upwelling Shadows in the Gulf of Arauco, Chile

et al. 2021

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“…Bayesian mixing models were consistent with those observations and agreed with preliminary expectations, suggesting that copepods and euphausiids would be the most important putative preys, followed in a minor proportion by amphipods and polychaetes. In this context, the Coquimbo Bay system is located within an important upwelling center (Moraga et al, 2001;Thiel et al, 2007), with copepods dominating the zooplankton community structure, while euphausiids are frequently observed in lower abundances (Mattos and Mujica, 2012;Torreblanca et al, 2016) as response to extensive diel vertical migration into the oxygen minimum zone (Thiel et al, 2007). The presence of amphipods and swimming nereid polychaetes in nocturnal pelagic assemblages is not rare, and has been associated to the incidence of artificial lights in shallow depths (<30 m) in the former (Carrasco et al, 2017), or to the presence of reproductive stages (i.e., epitokes) attracted by lunar phases in the latter (Fong, 1993).…”

Section: Trophic Ecology Of D Gahi In Northern-central Chilementioning

confidence: 99%

Discrete Spawning Aggregations of the Loliginid Squid Doryteuthis gahi Reveal Life-History Interactions of a Dwarf Morphotype at the Center of Its Distribution Range

et al. 2021

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Heterogeneous environmental conditions along the Humboldt Current System (HCS) influence the life-history strategy of a variety of species in different ways. There is limited information on latitudinal traits of coastal cephalopods as part of the interacting species in pelagic and benthic environments. The present study used the loliginid squid Doryteuthis gahi as a model organism to: (1) evaluate latitudinal traits on egg laying patterns, (2) characterize a particular spawning ground, (3) quantify the isotopic variation from different tissues, (4) evaluate potential trophic ontogenetic changes, (5) determinate trophic position, and (6) isotopically estimate the relative importance of putative preys in the squid’s assimilated diet. Results evidenced that egg-masses collected between 2014 and 2020 presented similar patterns along northern-central Chile (27–36°S), with females attaching small egg-capsules (10–50 mm length) through the year and over a variety of anthropogenic and natural substrates. At a small scale (Coquimbo; 29°S), early life history traits showed distinct patterns depending on SST, with warmer collection periods (∼18°C) evidencing larger capsules and smaller embryos, although small paralarvae were obtained over the 4-year sampling period. In this site, sampling of older ontogenetic stages supported the constant presence of small-sized squids (19–77 mm ML). Males had larger mean sizes compared to females and undetermined specimens, with a high proportion of mature stages. Observations in captivity were extended for up to 110 d, validating that small females (45–64 mm ML) spawn the small egg-capsules typically observed in the field. Differences in stable isotope composition between beaks and soft tissues of adult squids were lower for δ13C values (1.1 vs. 1.4‰, respectively) and higher for δ15N values (5.3 vs. 4.7‰, respectively). Isotopic composition through ontogeny found similar δ13C and δ15N values, suggesting that carbon sources (pelagic origin) and trophic position did not change significantly, with copepods, euphausiids and nereid polychaetes being the most important preys. This study unveils the permanent occurrence of a small reproductive morphotype of D. gahi in shallow coastal habitats of northern-central Chile (i.e., center of the distribution range), providing the first insights for understanding the species’ potential adaptations to heterogeneous conditions in the HCS and the unexplored distribution gap between the two centers of abundance (Peru and the Falkland/Malvinas islands).

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Spatial heterogeneity of mesozooplankton along the tropical coastal waters

Anandavelu

Robin

Ramachandran

et al. 2020

Continental Shelf Research

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Seasonal dynamics of zooplankton in a northern Chile bay exposed to upwelling conditions

Cited by 4 publications

References 28 publications

Surface Thermal Structure and Variability of Upwelling Shadows in the Gulf of Arauco, Chile

Surface Thermal Structure and Variability of Upwelling Shadows in the Gulf of Arauco, Chile

Discrete Spawning Aggregations of the Loliginid Squid Doryteuthis gahi Reveal Life-History Interactions of a Dwarf Morphotype at the Center of Its Distribution Range

Spatial heterogeneity of mesozooplankton along the tropical coastal waters

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