Abstract
The bamboo coral Isidella elongata is a forest-forming alcyonacean that dwells on deep-sea soft bottoms and is presently found in the Otranto Channel (Southern Adriatic Sea). In this study, we explored the spatial distribution and the demographic structure of the I. elongata facies (IF) over time, along with the diversity of IF-associated fauna in the southern Adriatic Sea, by using a time-series data of 9 years (2012–2020) from the Mediterranean International Bottom Trawl Survey (MEDITS). The spatial distribution of I. elongata was confronted with the fishing effort in the study area over time. This facies showed a constant spatial extent but a decreasing biomass over time. Changes in the basal diameter distribution of the colonies were also observed, with a significant decrease in the sizes from 2014 to 2020. These results suggest an increasing fishery-related impact from a developing deep-sea fishery occurring in the study area. The bamboo coral in the study area represents a hotspot of biodiversity in the context of the bathyal environment. A fisheries-restricted area was recently proposed in the context of the General Fisheries Commission for the Mediterranean at the Otranto Channel to help the conservation of I. elongata in the southern Adriatic Sea.
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Acknowledgments
This work has been supported by the Italian Ministry of Agriculture, Food, and Forestry Policy (MiPAAF) and the European Commission (EU Regulations 1004/2017) under the Data Collection Framework (DCF). The authors are grateful to the three anonymous reviewers and to Dr. Covadonga Orejas for their constructive comments and suggestions, which greatly helped to improve the manuscript.
Funding
The data used in this study were collected according to the Data Collection Framework (DCF), which is supported by the Italian Ministry of Agriculture, Food, and Forestry Policy (MiPAAF) and the European Commission (EU Regulations 1004/2017).
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Carbonara, P., Zupa, W., Follesa, M.C. et al. Spatio-temporal distribution of Isidella elongata, a vulnerable marine ecosystem indicator species, in the southern Adriatic Sea. Hydrobiologia 849, 4837–4855 (2022). https://doi.org/10.1007/s10750-022-05022-4
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DOI: https://doi.org/10.1007/s10750-022-05022-4