Macrobenthic patterns at the shallow marine waters in the caldera of the active volcano of Deception Island, Antarctica
| Autor: | Amelia Gómez-Garreta, Conxita Avila, Carlos Angulo-Preckler, Jordi Rull-Lluch, Blanca Figuerola, Laura Núñez-Pons, Juan Moles, Rafael P. Martín-Martín |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Shetland geography.geographical_feature_category 010504 meteorology & atmospheric sciences biology 010604 marine biology & hydrobiology Fauna Geology Odontaster validus Aquatic Science Oceanography biology.organism_classification 01 natural sciences Geography Benthic zone Archipelago Sterechinus neumayeri 14. Life underwater Species richness Bay 0105 earth and related environmental sciences |
| Zdroj: | Continental Shelf Research. 157:20-31 |
| ISSN: | 0278-4343 |
| DOI: | 10.1016/j.csr.2018.02.005 |
| Popis: | Deception Island is an active volcano located at the southern end of the South Shetland Archipelago, in the Antarctic Ocean. After the last eruption in 1970, benthic recolonization took place within the bay, with echinoderms being the dominant epifauna (e.g., the ophiuroid Ophionotus victoriae, the echinoid Sterechinus neumayeri and the sea star Odontaster validus), together with dense infaunal communities (mostly composed by oligochaetes, polychaetes, and bivalves). Here, we aim to describe the actual status of the marine benthic ecosystems inhabiting the shallow subtidal areas of this volcanic island. Benthic species were qualitatively scored as presence versus absence, considering the different sampling effort between localities done over the years. A total of 139 species of macroorganisms, belonging to 16 phyla were found, including fauna and flora, increasing the species richness values previously reported in all sites surveyed within the volcano caldera. Moreover, a dramatic increase in biodiversity was found towards the entrance of the bay. We suggest, however, that recolonization from external waters may not be the only reason for this pattern. In fact, sediment flux rates and substrate instability are common disturbances within the bay, probably being among the major factors determining benthic community assemblages. These processes probably favour deposit feeding communities at the innermost locations of the bay. This study provides a remarkably increased and updated species inventory from previous reports, altogether with a description of the main communities inhabiting the bay and the abiotic factors regulating this, mainly the bottom type. |
| Databáze: | OpenAIRE |
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