ORCID Profile
0000-0003-2686-714X
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Publisher: National Inquiry Services Center (NISC)
Date: 10-2020
Publisher: CSIRO Publishing
Date: 2018
DOI: 10.1071/MF17233
Abstract: The ecology of reef fish varies with depth, although patterns in ersity remain largely undescribed, in particular the complementarity of their taxonomic, functional and phylogenetic facets. In the present study we investigated patterns of taxonomic, functional and phylogenetic ersity of fish on 21 reefs, at depths ranging from 3 to 31m, at Príncipe Island (Gulf of Guinea). Taxonomic and functional ersity decreased monotonically with depth the pattern was less accentuated for phylogenetic ersity. Functional ersity was saturated at high levels of taxonomic ersity, reflecting redundancy in species traits, particularly at the shallower reefs. Functional ersity increased linearly with phylogenetic ersity thus, increasing niche availability seems to translate into a larger ersity of phylogenies. Dissimilarities in the structure and composition of fish assemblages among reefs were correlated with differences in depth, including a progressive turnover in species. Depth affected the functional traits of nearshore reef fish. Trophic breadth decreased with depth carnivores and planktivores increased with depth, whereas herbivores decreased with depth. Small-sized fusiform fish dominated on the shallowest reefs. In summary, the present study demonstrated decays in bio ersity, from different perspectives, of reef fish with depth, which are connected with shifts in fish traits.
Publisher: MDPI AG
Date: 12-01-2023
DOI: 10.3390/D15010103
Abstract: Rhodolith seabeds are ‘ecosystem engineers’ composed of free-living calcareous red macroalgae, which create extensive marine habitats. This study addressed how depth influenced the structure (size and morphology) of rhodoliths and the abundance of associated floral and faunal epibionts across the Eastern Atlantic Ocean. S ling was carried out at two sites within five regions (Brittany, Galicia, Madeira, Gran Canaria, and Principe Island), from temperate to tropical, covering a latitudinal gradient of 47°, in three depth strata (shallow, intermediate and deep), according to the rhodolith bathymetrical range in each region. Depth typically affected the rhodolith size at all regions the largest nodules were found in the intermediate and deep strata, while rhodolith sphericity was larger at the shallow depth strata. Higher biomasses of attached macroalgae (epiphytes) were observed at depths where rhodoliths were larger. The abundance of epifauna was variable across regions and depth strata. In general, the occurrence, structure, and abundance of the associated biota across rhodolith habitats were affected by depth, with local variability (i.e., sites within regions) often displaying a more significant influence than the regional (large-scale) variation. Overall, this study showed that the rhodolith morphology and associated epibionts (flora and fauna) were mostly affected by depth, irrespective of latitude.
No related grants have been discovered for António Abreu.