TY - JOUR
T1 - Growth and mortality of larval anchoveta Engraulis ringens, in northern Chile during winter and their relationship with coastal hydrographic conditions
AU - Contreras, Jorge E.
AU - Rodriguez-Valentino, Camilo
AU - Landaeta, Mauricio F.
AU - Plaza, Guido
AU - Castillo, Manuel I.
AU - Alvarado-Niño, Mónica
N1 - Funding Information:
We appreciate the help in the collection of the plankton samples by Msc. Elizabeth Paredes (Universidad de Antofagasta). This research was funded by projects FIP 2014-31 (grant to GP and MFL), INACH RT04_13 (grant to MFL), FONDECYT 1120868 (grant to G Muñoz) and FONDECYT 1150296 (grant to MFL).
Funding Information:
We appreciate the help in the collection of the plankton samples by Msc. Elizabeth Paredes (Universidad de Antofagasta). This research was funded by projects FIP 2014-31 (grant to GP and MFL), INACH RT04_13 (grant to MFL), FONDECYT 1120868 (grant to G Mu?oz) and FONDECYT 1150296 (grant to MFL).
Funding Information:
Fondo Nacional de Ciencia y Tecnología, FONDECYT, Grant/Award Number: 1120868, 1150296; Fondo de investigación pesquera, FIP, Grant/Award Number: 2014-31; FIP 2014-31; INACH, Grant/Award Number: RT04_13; FONDECYT, Grant/ Award Number: 1120868, 1150296
Publisher Copyright:
© 2017 John Wiley & Sons Ltd
PY - 2017/11
Y1 - 2017/11
N2 - Larval growth, age, growth effect and instantaneous mortality were estimated in anchoveta, Engraulis ringens, collected biweekly during the austral winter of 2014 in nearshore waters off Bay of Antofagasta (23°41′W–70°30′S), northern Chile. Through measuring standard length (SL) and sagitta microstructure analysis, it was estimated that the growth rate of E. ringens larvae decreased from June (0.85 mm day−1) to August (0.50 mm day−1). However, the water temperature was homogeneous during the sampling dates (14.6, 15.2, 14.4, and 14.6°C), suggesting that the decelerating larval growth was not linked to changes in sea temperature. Additionally, larvae with slow growth have larger otoliths compared with conspecifics with fast growth (growth effect). Larval mortality rates tended to decrease until the middle of July (0.18 per day) but increased to 0.25 per day in early August, which coincided with lower food availability (i.e., chlorophyll-a, 2.7–5.6 mg m−3) and a high occurrence of smaller larvae (1.58–11.5 mm). Partial least squares analysis indicates low covariance between the biological and oceanographic variables (PLS: 11.71%), suggesting that other factors, such as parental effects, may explain the abrupt decrease in the larval growth rates.
AB - Larval growth, age, growth effect and instantaneous mortality were estimated in anchoveta, Engraulis ringens, collected biweekly during the austral winter of 2014 in nearshore waters off Bay of Antofagasta (23°41′W–70°30′S), northern Chile. Through measuring standard length (SL) and sagitta microstructure analysis, it was estimated that the growth rate of E. ringens larvae decreased from June (0.85 mm day−1) to August (0.50 mm day−1). However, the water temperature was homogeneous during the sampling dates (14.6, 15.2, 14.4, and 14.6°C), suggesting that the decelerating larval growth was not linked to changes in sea temperature. Additionally, larvae with slow growth have larger otoliths compared with conspecifics with fast growth (growth effect). Larval mortality rates tended to decrease until the middle of July (0.18 per day) but increased to 0.25 per day in early August, which coincided with lower food availability (i.e., chlorophyll-a, 2.7–5.6 mg m−3) and a high occurrence of smaller larvae (1.58–11.5 mm). Partial least squares analysis indicates low covariance between the biological and oceanographic variables (PLS: 11.71%), suggesting that other factors, such as parental effects, may explain the abrupt decrease in the larval growth rates.
KW - Engraulis ringens
KW - growth effect
KW - northern Chile
KW - otolith
UR - http://www.scopus.com/inward/record.url?scp=85018454901&partnerID=8YFLogxK
U2 - 10.1111/fog.12219
DO - 10.1111/fog.12219
M3 - Article
AN - SCOPUS:85018454901
VL - 26
SP - 603
EP - 614
JO - Fisheries Oceanography
JF - Fisheries Oceanography
SN - 1054-6006
IS - 6
ER -