Rocky substrate affects benthic heterobranch assemblages and prey/predator relationships

Canessa M.; Bavestrello G.; Cattaneo-Vietti R.Furfaro G.Doneddu M.Navone A.Trainito E.

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Rocky substrate affects benthic heterobranch assemblages and prey/predator relationships

机译：Rocky substrate affects benthic heterobranch assemblages and prey/predator relationships

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During the last twenty years, several studies have demonstrated the primary role of the lithological properties of hard substrates in conditioning the diversity and structure of marine sessile communities (aka bio-mineralogy). This research was dedicated to testing whether different substrates (limestones and granites) influence higher levels of the trophic net. For this purpose, the diversity and abundance of heterobranch molluscs were used to test the hypothesis that their distribution could mirror their prey. The study was conducted in the 'TavolaraPunta Coda Cavallo' Marine Protected Area (NE Sardinia, Mediterranean Sea), where substrates of different lithology co-occur in a restricted area. Diversity and abundance of heterobranchs were investigated by photographic sampling (3300 studied images) in twelve sites (six limestones and six granites), between 35 and 50 m depth, demonstrating clear preferences of several species for a specific substrate, while others are ubiquitarian. In general, diversity and abundance were higher on limestones due to the exclusive presence of Sacoglossa coupled with a more significant number of Cladobranchia and Doridina; on the other hand, Umbraculida were strongly granite-selected. In some cases, the different affinity of each species was clarified by the distribution of their food sources, but, in others, it is possible to hypothesise that the structure of the whole benthic community, affected by the substrate characteristics, may drive the heterobranchs' distribution.

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《Estuarine coastal and shelf science》 |2021年第31期|107568.1-107568.13|共13页
作者
Canessa M.; Bavestrello G.; Cattaneo-Vietti R.Furfaro G.Doneddu M.Navone A.Trainito E.;
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作者单位

Univ Genoa, Dipartimento Sci Terra Ambiente & Vita DISTAV, Corso Europa 26, I-16132 Genoa, Italy;

Univ Salento, DiSTeBA, Via Provle Lecce Monteroni, I-73100 Lecce, Italy;

Via Palau 5, I-07029 Tempio Pausania, ItalyTavolara Punta Coda Cavallo MPA, Via San Giovanni 14, I-07026 Olbia, Italy;

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Bio-mineralogy; Sea slugs; Limestone; Granite; Mediterranean sea;

Rocky substrate affects benthic heterobranch assemblages and prey/predator relationships

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