TY - JOUR
T1 - Upwelling intensity modulates the fitness and physiological performance of coastal species
T2 - Implications for the aquaculture of the scallop Argopecten purpuratus in the Humboldt Current System
AU - Ramajo, Laura
AU - Valladares, María
AU - Astudillo, Orlando
AU - Fernández, Carolina
AU - Rodríguez-Navarro, Alejandro B.
AU - Watt-Arévalo, Paul
AU - Núñez, Manuel
AU - Grenier, Christian
AU - Román, Rocío
AU - Aguayo, Paulina
AU - Lardies, Marco A.
AU - Broitman, Bernardo R.
AU - Tapia, Pamela
AU - Tapia, Christian
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/11/25
Y1 - 2020/11/25
N2 - Understanding how marine species cope with the natural environmental variability of their native habitats will provide significant information about their sensitivity to the potential environmental changes driven by climate change. In particular, marine species inhabiting upwelling ecosystems are experiencing low seawater temperatures, as well as, acidic and low oxygen conditions as a consequence of the nature of the deep upwelled waters. Our study is focused on one of the most important socio-economical resources of the Humboldt Current System (HCS): the scallop Argopecten purpuratus which has been historically subjected to intensive aquaculture in areas influenced by upwelling processes. Here, a long-term field experiment was performed to understand how tolerant and well-locally-adapted is A. purpuratus to upwelling conditions by studying a set of fitness, physiological, and biomineralogical traits. Stronger upwelling generated a minor water column stratification, with lower temperatures, pH, and oxygen conditions. On the contrary, as upwelling weakened, temperature, pH, and oxygen availability increased. Finally, upwelling intensity also determined the number, duration, and intensity of the cooling and de-oxygenation events occurring in A. purpuratus habitat, as well as, the food availability (chlorophyll-a concentration, Chl-a). Physiologically, A. purpuratus was able to cope with stressful environmental conditions imposed by higher upwelling intensities by enhancing its metabolic and calcification rates, as well, producing higher concentrations of the shell organic matter. These physiological changes impacted the total energy budget, which was highly dependent on Chl-a concentration, and revealed important traits trade-offs with significant fitness costs (higher mortalities emerged when longer and more intense upwelling events succeed). Our study increases the knowledge about the physiological performance and tolerance of this important resource to the ocean acidification and ocean-deoxygenation imposed by variable upwelling intensities, as well as, its potential vulnerability under future changing conditions driven by a potential upwelling intensification.
AB - Understanding how marine species cope with the natural environmental variability of their native habitats will provide significant information about their sensitivity to the potential environmental changes driven by climate change. In particular, marine species inhabiting upwelling ecosystems are experiencing low seawater temperatures, as well as, acidic and low oxygen conditions as a consequence of the nature of the deep upwelled waters. Our study is focused on one of the most important socio-economical resources of the Humboldt Current System (HCS): the scallop Argopecten purpuratus which has been historically subjected to intensive aquaculture in areas influenced by upwelling processes. Here, a long-term field experiment was performed to understand how tolerant and well-locally-adapted is A. purpuratus to upwelling conditions by studying a set of fitness, physiological, and biomineralogical traits. Stronger upwelling generated a minor water column stratification, with lower temperatures, pH, and oxygen conditions. On the contrary, as upwelling weakened, temperature, pH, and oxygen availability increased. Finally, upwelling intensity also determined the number, duration, and intensity of the cooling and de-oxygenation events occurring in A. purpuratus habitat, as well as, the food availability (chlorophyll-a concentration, Chl-a). Physiologically, A. purpuratus was able to cope with stressful environmental conditions imposed by higher upwelling intensities by enhancing its metabolic and calcification rates, as well, producing higher concentrations of the shell organic matter. These physiological changes impacted the total energy budget, which was highly dependent on Chl-a concentration, and revealed important traits trade-offs with significant fitness costs (higher mortalities emerged when longer and more intense upwelling events succeed). Our study increases the knowledge about the physiological performance and tolerance of this important resource to the ocean acidification and ocean-deoxygenation imposed by variable upwelling intensities, as well as, its potential vulnerability under future changing conditions driven by a potential upwelling intensification.
KW - Aquaculture
KW - Humboldt Current System
KW - Ocean acidification
KW - Ocean de-oxygenation
KW - Physiology
KW - Scallops
UR - http://www.scopus.com/inward/record.url?scp=85088817768&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2020.140949
DO - 10.1016/j.scitotenv.2020.140949
M3 - Article
C2 - 32758743
AN - SCOPUS:85088817768
SN - 0048-9697
VL - 745
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 140949
ER -