In situ growth rates of deep-water octocorals determined from 3D photogrammetric reconstructions
| Autor: | Bennecke, Swaantje, Kwasnitschka, Tom, Metaxas, Anna, Dullo, Wolf-Christian |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
In situ 010504 meteorology & atmospheric sciences 010604 marine biology & hydrobiology Fauna Coral Aquatic Science 01 natural sciences Deep water Oceanography Georeference Environmental science Ecosystem Paragorgia arborea Primnoa resedaeformis 0105 earth and related environmental sciences |
| Zdroj: | Datacite ORCID Microsoft Academic Graph |
| DOI: | 10.1007/s00338-016-1471-7 |
| Popis: | Growth rates of deep-water corals provide important information on the recovery potential of these ecosystems, for example from fisheries-induced impacts. Here, we present in situ growth dynamics that are currently largely unknown for deep-water octocorals, calculated by applying a non-destructive method. Videos of a boulder harbouring multiple colonies of Paragorgia arborea and Primnoa resedaeformis in the Northeast Channel Coral Conservation Area at the entrance to the Gulf of Maine at 863 m depth were collected in 2006, 2010 and 2014. Photogrammetric reconstructions of the boulder and the fauna yielded georeferenced 3D models for all sampling years. Repeated measurements of total length and cross-sectional area of the same colonies allowed the observation of growth dynamics. Growth rates of total length of Paragorgia arborea decreased over time with higher rates between 2006 and 2010 than between 2010 and 2014, while growth rates of cross-sectional area remained comparatively constant. A general trend of decreasing growth rates of total length with size of the coral colony was documented. While no growth was observed for the largest colony (165 cm in length) between 2010 and 2014, a colony 50–65 cm in length grew 3.7 cm yr−1 between 2006 and 2010. Minimum growth rates of 1.6–2.7 cm yr−1 were estimated for two recruits ( |
| Databáze: | OpenAIRE |
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