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Remote and Local Environmental Factors Drive Long-Term Trends of an Estuarine-Dependent Marine Fish in a Subtropical Coastal Lagoon
Ist Teil von
Estuaries and coasts, 2024, Vol.47 (1), p.244-257
Ort / Verlag
New York: Springer US
Erscheinungsjahr
2024
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
An important component of global climate influencing ecological systems is the
El Niño
Southern Oscillation (ENSO), which affects hydrological conditions in coastal environments around the world. Based on long-term time series of monthly sampling (1997–2019), we investigated the influence of remote (ENSO) and local environmental factors on the juvenile’s abundance of the Argentine menhaden
Brevoortia pectinata
in a subtropical estuary. We also evaluated if the abundance over the years is decreasing due to the negative effects of higher intense
El Niño
events. Despite the apparent increase in abundance over the years, time series decomposition and mixed models did not reveal an increasing trend along the studied period (Chisq = 2.62;
p
= 0.289). The overall interannual trend varied across sampling sites, and a trend of increasing abundance over the years was observed only at the estuary site closest to the sea (Chisq = 5.59;
p
= 0.018). The most parsimonious GAM model revealed that salinity, temperature, and ENSO (based on the Oceanic Niño Index, ONI) explained 23.8% of the abundance variation of
B. pectinata
juveniles. There was a negative effect on the abundance during
El Niño
years, especially during more intense events (ONI > 1.5), but no apparent effects were observed for
La Niña
events. Our findings revealed that the variations in the abundance of this species depend not only on local factors such as temperature and salinity, but also on global climatic phenomena that influence estuarine hydrology.