TY - JOUR
T1 - Oceanographic influences on the early life stages of a mesopelagic fish across the Chilean Patagonia
AU - Molina-Valdivia, Víctor
AU - Bustos, Claudia A.
AU - Castillo, Manuel I.
AU - Search, Francesca V.
AU - PLAZA PASTEN, GUIDO
AU - Landaeta, Mauricio F.
N1 - Funding Information:
The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Mauricio F. Landaeta reports financial support was provided by Servicio Hidrografico y Oceanografico de la Armada de Chile (SHOA).
Funding Information:
We appreciate the help during the fieldwork of the crew of RV Cabo de Hornos. We appreciate the help of M.A. Reculé for her help in the onboard experiments, and H. Gilante and B. Fernández-General for their help in otolith processing. This research was funded by the Comité Oceanográfico Nacional (CONA-Chile), through the projects CIMAR-Fiordos 23 (C23F 17-01) and 24 (C24F 18-03), grants to CAB, MFL and MIC, and CS2018-7929, grant to MIC, MFL and Eulogio Soto.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/7
Y1 - 2021/7
N2 - Environmental conditions, such as sea surface temperatures and salinities, may exert important influences on the life history traits of marine organisms, particularly on the early stages of fishes. We studied the interaction between spring environmental conditions, egg and larval abundances, and growth rates, of pearlside Maurolicus australis along a 10° latitudinal range in western Patagonia. Using onboard field experiments, otolith-based back-calculated daily growth rates, CTD data, together with sea surface temperature (SST, 2002–2019) and chlorophyll-a (Chl-a, 2017–2018) satellite images, we studied the effect of short-term mesoscale variability on larval growth as well as their interactions with environmental conditions. SST of 2017 and 2018 were similar, with colder than average (2003–2018) springs for both years. Onboard experiments indicated that egg size directly influenced the size-at-hatch, though this was independent of lipid reserves. Larvae were categorized into Oceanic (Oc), Inner Seas (IS) and off the Southern Ice Fields (SIF). On the shelf (Oc), larvae were more abundant with faster growth rates; a second maximum density was observed off the SIF. The latter individuals had the smallest otolith-at-size and showed the slowest recent growth rates, despite spatially coinciding with relatively large Chl-a concentrations (>8 mg m−2). Latitudinally, the decrease in sea surface temperatures and the rise in vertical salinity gradients, reduced the recent larval growth of the pearlside. However, daily fluctuations in SST did not trigger significant variations in the back-calculated detrend growth rates. Although low temperatures in the SIF lead to slow growth rates of M. australis, compared to the northern population, the area presents some benefits regarding food availability, retention and protection from predators. Moreover, it is possible that the low temperatures might affect the energy balance of fish larval stages by intervening in the allocation of energy for tissue formation and metabolism, resulting in slow growth rates in the southern population.
AB - Environmental conditions, such as sea surface temperatures and salinities, may exert important influences on the life history traits of marine organisms, particularly on the early stages of fishes. We studied the interaction between spring environmental conditions, egg and larval abundances, and growth rates, of pearlside Maurolicus australis along a 10° latitudinal range in western Patagonia. Using onboard field experiments, otolith-based back-calculated daily growth rates, CTD data, together with sea surface temperature (SST, 2002–2019) and chlorophyll-a (Chl-a, 2017–2018) satellite images, we studied the effect of short-term mesoscale variability on larval growth as well as their interactions with environmental conditions. SST of 2017 and 2018 were similar, with colder than average (2003–2018) springs for both years. Onboard experiments indicated that egg size directly influenced the size-at-hatch, though this was independent of lipid reserves. Larvae were categorized into Oceanic (Oc), Inner Seas (IS) and off the Southern Ice Fields (SIF). On the shelf (Oc), larvae were more abundant with faster growth rates; a second maximum density was observed off the SIF. The latter individuals had the smallest otolith-at-size and showed the slowest recent growth rates, despite spatially coinciding with relatively large Chl-a concentrations (>8 mg m−2). Latitudinally, the decrease in sea surface temperatures and the rise in vertical salinity gradients, reduced the recent larval growth of the pearlside. However, daily fluctuations in SST did not trigger significant variations in the back-calculated detrend growth rates. Although low temperatures in the SIF lead to slow growth rates of M. australis, compared to the northern population, the area presents some benefits regarding food availability, retention and protection from predators. Moreover, it is possible that the low temperatures might affect the energy balance of fish larval stages by intervening in the allocation of energy for tissue formation and metabolism, resulting in slow growth rates in the southern population.
KW - Fjord
KW - Maurolicus
KW - Otolith
KW - Salinity
KW - Southern ice fields
KW - Vertical stability
UR - http://www.scopus.com/inward/record.url?scp=85104703193&partnerID=8YFLogxK
U2 - 10.1016/j.pocean.2021.102572
DO - 10.1016/j.pocean.2021.102572
M3 - Article
AN - SCOPUS:85104703193
VL - 195
JO - Progress in Oceanography
JF - Progress in Oceanography
SN - 0079-6611
M1 - 102572
ER -