Are seamounts refuge areas for fauna from polymetallic nodule fields?

Biogeosciences - Tập 17 Số 9 - Trang 2657-2680
Daphné Cuvelier1, Pedro A. Ribeiro1,2, Sofia P. Ramalho1,3, Daniel Kersken4,5, Pedro Martínez Arbizu5, Ana Colaço1
1Marine and Environmental Sciences Centre (MARE), Instituto do Mar (IMAR), Centro Okeanos, Universidade dos Açores, Rua Prof. Dr. Frederico Machado 4, 9901-862 Horta, Portugal
2current address: Department of Biological Sciences and K.G. Jebsen Centre for Deep Sea Research, University of Bergen, Bergen, Norway
3current address: Centro de Estudos do Ambiente e do Mar (CESAM), Departmento de Biologia, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
4Department of Marine Zoology, Senckenberg Research Institute and Natural History Museum, Senckenberganlage 25, 60325 Frankfurt am Main, Germany
5German Centre for Marine Biodiversity Research (DZMB), Senckenberg am Meer, Südstrand 44, 26382 Wilhelmshaven, Germany

Tóm tắt

Abstract. Seamounts are abundant and prominent features on the deep-sea floor and intersperse with the nodule fields of the Clarion-Clipperton Fracture Zone (CCZ). There is a particular interest in characterising the fauna inhabiting seamounts in the CCZ because they are the only other ecosystem in the region to provide hard substrata besides the abundant nodules on the soft-sediment abyssal plains. It has been hypothesised that seamounts could provide refuge for organisms during deep-sea mining actions or that they could play a role in the (re-)colonisation of the disturbed nodule fields. This hypothesis is tested by analysing video transects in both ecosystems, assessing megafauna composition and abundance. Nine video transects (ROV dives) from two different license areas and one Area of Particular Environmental Interest in the eastern CCZ were analysed. Four of these transects were carried out as exploratory dives on four different seamounts in order to gain first insights into megafauna composition. The five other dives were carried out in the neighbouring nodule fields in the same areas. Variation in community composition observed among and along the video transects was high, with little morphospecies overlap along intra-ecosystem transects. Despite the observation of considerable faunal variations within each ecosystem, differences between seamounts and nodule fields prevailed, showing significantly different species associations characterising them, thus calling into question their use as a possible refuge area.

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Biogeosciences

Tập 17 Số 9

2657-2680

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