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Published on: February 14, 2021
Climate-driven shifts in decapod larvae assemblages in a temperate estuary
Marta Monteiro1, Miguel Ângelo Pardal2, Ulisses Miranda Azeiteiro3
1Centre for Environmental and Marine Studies (CESAM), Department of Biology, University of Aveiro, Campus Universitario de Santiago, 3810-193, Aveiro, Portugal; MARE- Marine and Environmental Sciences Centre/ARNET - Aquatic Research Network, School of Tourism and Maritime Technology, Polytechnic of Leiria, Portugal; Centre for Functional Ecology - Science for People & the Planet (CFE), Associate Laboratory TERRA, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456, Coimbra, Portugal.
The North Atlantic Oscillation (NAO) influences sea temperatures and decapod larvae. Warmer waters post-2007 increased larval abundance and richness, though marine heatwaves had no discernible impact.
Area of Science:
- Marine ecology
- Oceanography
- Climate science
Background:
- The North Atlantic Oscillation (NAO) significantly impacts regional climate, hydrology, and sea surface temperatures.
- Understanding thermal variability's influence on marine communities is crucial for predicting ecosystem responses to climate change.
Purpose of the Study:
- To investigate the impact of climatic patterns, specifically the NAO, on decapod larval communities in the Mondego Estuary.
- To analyze the relationship between sea surface temperatures, thermal variability, and decapod larval abundance and phenology.
Main Methods:
- Monthly zooplankton sampling at the Mondego Estuary entrance from 2003-2012.
- Analysis of decapod larval assemblages, focusing on Carcinus maenas, Diogenes pugilator, and Pachigrapsus marmoratus.
- Correlation of observed changes with North Atlantic Oscillation (NAO) data and sea surface temperatures, including Marine Heatwaves (MHW).
Main Results:
- Decapod larval assemblages showed interannual and seasonal fluctuations linked to sea surface temperatures.
- A significant system shift around 2007, driven by the NAO, led to increased decapod larval abundance and richness.
- While heightened temperatures advanced larval phenology, Marine Heatwaves (MHW) did not show a discernible impact on these communities.
Conclusions:
- Sea temperature is a critical factor influencing decapod larvae dynamics, with warmer conditions promoting abundance and richness.
- The NAO-driven climate shifts have altered decapod larval community structure and phenology.
- Further research is needed to understand the long-term effects of climate change and thermal shifts on these vital meroplanktonic communities.
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