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Calcified Artery Preparation and Processing with Preserved Morphology and RNA for Digital Spatial Profiling
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Deeper waters, more calcifiers: Spatial variation in benthic assemblages highlight conservation challenges in
Lucía Bergagna1, Luciana Riccialdelli1, Gustavo Lovrich1
1Centro Austral de Investigaciones Científicas (CADIC) - Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), CP 9410, Ushuaia, Argentina.
Marine Environmental Research
|February 7, 2026
Summary
Marine Protected Areas (MPAs) in the sub-Antarctic protect diverse benthic life. However, high biodiversity turnover suggests current zoning may not fully safeguard habitats against climate change and ocean acidification.
Area of Science:
- Marine ecology
- Conservation biology
- Oceanography
Background:
- Marine Protected Areas (MPAs) are crucial for conserving biodiversity and ecosystem services.
- Sub-Antarctic MPAs Namuncurá - Burdwood Bank I and II protect rich benthic assemblages in plateau and slope habitats.
- Anthropogenic CO2 emissions driving climate change and ocean acidification pose significant threats to these MPAs.
Purpose of the Study:
- Establish an ecological baseline for benthic assemblages in sub-Antarctic MPAs.
- Evaluate MPA effectiveness in conserving biodiversity.
- Monitor climate change impacts and inform management strategies.
Main Methods:
- Benthic megafauna diversity and structure analyzed using bottom trawls (90-710 m depth).
- Comparisons made across the MPA, Beagle Channel, and Atlantic shelf.
- Uni- and multivariate statistical analyses applied to taxonomic data.
Main Results:
- 236 taxa identified; 167 unique to the MPAs, highlighting their distinctiveness.
- Sponges dominated shallower habitats, while calcifying taxa (corals, echinoderms) predominated in deeper areas.
- High beta-diversity turnover within MPAs indicated potential inadequacy of current zonation.
Conclusions:
- Sub-Antarctic MPAs harbor significant biodiversity and conservation value.
- Current MPA zonation may be insufficient to protect benthic habitats from climate change impacts, particularly ocean acidification.
- Findings provide a foundation for effective MPA management and assessing ecological responses to environmental change.
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