Paper| Year: | 2022 |
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| Author(s): | F. Cerna, G. Moyano, G. Plaza, B. Morales-Nin |
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| Title: | Spatial and inter-annual changes in the growth patterns of young-of-year anchovy in a high productive ecosystem |
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| Journal: | FISHERIES RESEARCH |
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| ISSN: | 0165-7836 |
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| Volume: | 249 |
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| Pages: | 106236 |
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| D.O.I.: | 10.1016/j.fishres.2022.106236 |
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| Web: | |
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| Abstract: | The spatial and temporal variation of the early growth patterns (EGP) of anchoveta (Engraulis ringens),
were analyzed and compared among three geographic areas, i.e., Northern
zone (18–24°S); North-central zone (26–30°S) and Southern zone
(33–42°S) off the Chilean coast over three years (i.e., 2015, 2016 and
2019). EGP were determined through otolith
microstructure analysis for juveniles ranging from 2.0 to 12.0 cm in
total length (TL), corresponding to ages from 28 to 187 days. The
comparative growth analysis between the three study areas for the 2015,
2016 and 2019 cohorts showed significant differences in the
Laird-Gompertz growth parameters and the absolute growth rate at the
inflection point (0.67–1.11 mmd−1). A generalized
additive models (GAM) was used to analyze changes in mean daily
increment width profiles (IW) as related to the area, monthly cohort,
sea surface temperature (SST) and Chlorophyll concentration (Chloa)
as predictive variables. The GAM did not show significant difference in
mean IW between northern and north-central areas (7.9 ± 3.9 vs
8.3 ± μm), although they significantly varied with respect the southern
area, where the lower values of IW were found (5.6 µm). The GAM showed
higher IW partial residuals when SST was above 14 °C and Chloa concentration was lower than 2 m gm−3. Overall results showed a high plasticity in the early growth pattern of E. ringens,
indicating interannual and spatial variability, with SST playing a
pivotal role across a wide latitudinal gradient off Chilean coast. |
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Related staffBeatriz Morales NinRelated departmentsMarine Ecology
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