Spatio-temporal variability of ichthyoplankton and its relationship with oceanographic conditions at the shelf break off Chilean Patagonia (43°S–51°S)

Osorio-Zúñiga, Francisca; Landaeta, Mauricio F.; Angulo‐Aros, Jorge; Balbontín, Fernando

doi:10.1080/17451000.2017.1406663

Cited by 11 publications

(7 citation statements)

References 20 publications

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“…For example, Landaeta et al (2011) suggested that intermediate values of vertical stability, temperature and density influence the ichthyoplankton dynamics in the same study area. Similarly, to our results, Castillo‐Hidalgo et al (2018) showed that channels with lower water turbidity and higher vertical stratification caused by freshwater intrusion are characterized by lower larval fish abundances, while Osorio‐Zúñiga et al (2018) indicated that only the abundance of M. australis larvae was positively correlated with temperature and salinity. However, long‐term studies describing the larval fish dynamics in this region are lacking.…”

Section: Discussionsupporting

confidence: 90%

“…In this ecosystem, several studies suggested relationships between environmental factors and ichthyoplankton distributions and composition (Osorio-Zúñiga et al, 2018). All previous studies, however, have been performed in a short temporal (austral spring) window (but see Bustos et al, 2011); therefore, the long-term dynamics of larval fish species and their persistence or variations associated with several environmental factors is unknown.…”

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confidence: 99%

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Spatio‐temporal patterns of ichthyoplankton in southern Chilean Patagonia: β‐diversity and associated environmental factors

Landaeta

Paredes

Castillo

et al. 2023

Fisheries Oceanography

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Fjords play an important role in biological productivity worldwide but are vulnerable to climate/anthropogenic effects. Chilean Patagonia (41°S–55°S) is one of the largest fjord ecosystems in the world, characterized by a complex geography with highly heterogeneous hydrographic conditions and a permanent input from oceanic water mass, both of which influence the ichthyoplankton distributional patterns. In this study, we analysed the distributional patterns of ichthyoplankton and its diversity during austral spring from 1996, 2009 and 2019 in the southern Chilean fjords (47°S–54°S). The area shows important latitudinal gradients of sea surface temperature (from 15°C to 5°C), fjord‐ocean variability in salinity (from 23 to 33) and water column temperature (3°C to 9°C). Spatial (but not temporal) variations in the composition and abundance of ichthyoplankton were recorded, caused mainly by differences in the abundance of larval Sprattus fuegensis, Maurolicus australis and Sebastes oculatus. Richness was higher on continental shelf and the lowest nearby fjord's head and ice fields. At the spatial scale, β‐diversity showed an increased species replacement (turnover) across areas, suggesting an important role of environmental conditions (e.g., salinity and water stratification) on the larval fish structure in this region. Ordination analysis indicates that changes in salinity and temperature, caused by ice melting, is the main environmental factor influencing the abundance of larval Thysanopsetta naresi (1996), Cataetyx messieri (2009) and Bathylagichthys parini (2019). Finally, this study highlights the importance of the conservation and protection of the Chilean Patagonia and monitoring ichthyoplankton communities, which are vital biomarkers of ecosystem health.

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Section: Discussionsupporting

confidence: 90%

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confidence: 99%

Spatio‐temporal patterns of ichthyoplankton in southern Chilean Patagonia: β‐diversity and associated environmental factors

Landaeta

Paredes

Castillo

et al. 2023

Fisheries Oceanography

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“…The spatial distribution of the ichthyoplanktonic assemblage is highly influenced by mesoscale physical processes commonly occurring over continental shelf break areas, such as eddies or density fronts (Grimes & Finucane 1991, Sabatés & Olivar 1996. Temperature and salinity may also play important roles in the structure of the ichthyoplanktonic assemblages (Osorio-Zúñiga et al 2018). oligotrophic warm waters (Peterson & Stramma 1991), which leads to low biological productivity (e.g.…”

Section: Introductionmentioning

confidence: 99%

Ichthyoplankton community structure on the shelf break off northeastern Brazil

Santana

Costa

Veleda

et al. 2020

An. Acad. Bras. Ciênc.

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Oceanographic features influence the early stages of fish to a high degree. We investigated the influence of continental shelf-slope gradient on the ichthyoplankton composition and distribution off Northeastern Brazil. Two oceanographic campaigns were performed during July-August 2010 and 2012. The samplings were performed along three transects composed by three stations, covering the continental shelf and slope areas. Abiotic data were obtained by an ADCP and a CTD. The ichthyoplankton was sampled through diurnal and nocturnal hauls using a 500-µm bongo net from 200 m to the surface. A total of 1634 larvae and 4023 eggs, representing 91 genera and 76 species, were collected. Higher concentrations of fish eggs were found on the continental shelf, probably because of the North Brazil Undercurrent flux. Higher concentrations of larvae were found at night and could be associated with net avoidance or natural variation. Neritic, oceanic and transition groups of species association were determined. Larvae of neritic, demersal and pelagic fishes prevailed on the continental shelf, while larvae of oceanic, mesopelagic and bathypelagic fishes on the continental slope. Melanostomiidae, Scorpaena sp., Lestidium atlanticum, Lampadena sp. and Diaphus sp. were identified as indicators of the continental slope.

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“…Not only the maximum values of empirical I GS but also those modelled by GAM show an important presence of active mature females (stages 3–5) of both Seriolella species during the third quarter (July–September), mostly north of 47°S. This pattern matches the presence of pelagic egg and larvae of the genus in the offshore austral and inner sea at Chiloe island (Bustos et al ., ; Osorio‐Zuñiga et al ., ), which could indicate an important spawning ground. Indeed, the area 43–47° S has been characterised as the main spawning area for other species of commercial importance such as Me.…”

Section: Discussionmentioning

confidence: 99%

Reproductive biology and population structure of white warehou Seriolella caerulea and silver warehou Seriolella punctata in the austral zone off Chile

Liu

Flores

Quiróz

et al. 2019

Journal of Fish Biology

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Using an extensive database compiled by scientific observers aboard commercial fishing operations between 1984 and 2014, we describe the maturity and size structures of white warehou Seriolella caerulea and silver warehou Seriolella punctata from by‐catch of the trawling industrial fisheries operating in the austral zone off Chile. Macroscopic maturity stages and gonadosomatic (IGS) index show mature females throughout the year and a pronounced spawning period in both austral autumn and winter seasons, with an IGS peak in July for S. punctata and August for S. caerulea. Reproductive patterns in both species show an extended spawning season (July to September) across the area between 43 and 47° S. Length–mass relationships showed significant differences between sexes in both species, where females reach a larger size. Fork length at 50% maturity was 43.5 cm for S. caerulea and 37.2 cm for S. punctata. Female catch composition is dominated by adult fish (96% for S. caerulea and 86% for S. punctata). Currently, both species are exploited with no assessment and management‐decision framework. Therefore, information regarding reproductive biology and demographic traits becomes an important baseline to ensure adequate fisheries management for both species.

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Spatio-temporal variability of ichthyoplankton and its relationship with oceanographic conditions at the shelf break off Chilean Patagonia (43°S–51°S)

Cited by 11 publications

References 20 publications

Spatio‐temporal patterns of ichthyoplankton in southern Chilean Patagonia: β‐diversity and associated environmental factors

Spatio‐temporal patterns of ichthyoplankton in southern Chilean Patagonia: β‐diversity and associated environmental factors

Ichthyoplankton community structure on the shelf break off northeastern Brazil

Reproductive biology and population structure of white warehou Seriolella caerulea and silver warehou Seriolella punctata in the austral zone off Chile

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