Percorrer por autor "Freitas, Rui"
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- Checklist of coastal fishes from Cabo Verde ArchipelagoPublication . Barcelos, Luís; Freitas, Rui; Barreiros, João Pedro; Ottoni, FelipeABSTRACT: Taxonomic and geographic misattributions in biodiversity inventories remain a pressing issue in biogeographical research, particularly in regions with overlapping or similar place names. The Republic of Cabo Verde (also known as Cabo Verde Islands) and the Cape Verde Peninsula (Senegal) exemplify this challenge, where historical and recent studies have struggled to provide accurate species distributions due to unverified, erroneous and ambiguous records. This underscores the necessity of comprehensive, reliable datasets to delineate species occurrences across these distinct geographic areas.
- First record of the Sculptured Mitten Lobster Parribacus antarcticus (Crustacea, Decapoda, Scyllaridae) from the Cabo Verde Islands (eastern Atlantic)Publication . Freitas, Rui; Wirtz, PeterThe lobster genus Parribacuscontains six living and one fossil species (Holthuis 1991; Chan 2010; Nyborg & Garassino 2017). In the Atlantic Ocean, only one living species is known, Parribacus antarcticus(Lund, 1793); it has been recorded in the western Atlantic from Florida to Brazil and recently also from the mid-Atlantic island of Ascension (Brown et al.2016). It is nocturnal and is often found hiding in crevices during daytime (Holthuis 1991). We here note the presence of Parribacus antarcticusat the Cabo Verde Islands, the first record of the species from the eastern Atlantic.
- New and confirmed records of fishes from the Cabo Verde archipelago based on photographic and genetic dataPublication . Freitas, Rui; Falcón, J. M.; González, José A.; Burnett, K. A.; Dureuil, M.; Caruso, J. H.; Hoving, H. J. T.; Brito, A.In recent decades the Cabo Verde ichthyofauna has been studied more extensively, and nowadays photo-recording is employed as a valuable asset under special caution and consideration. Four species reported here are new records for Cabo Verde: Carlarius sp., sea catfish; Serranus cabrilla, comber; Branchiostegus semifasciatus, African tilefish and Lutjanus dentatus, African coastal snapper. The presence in Cabo Verde of Glaucostegus cemiculus, blackchin guitarfish, Elops senegalensis, Senegalese ladyfish, Lophius spp., bathydemersal monkfishes, Rachycentron canadum, cobia, Pagrus auriga, African seabream, Lutjanus dentatus, African coastal snapper and Mugil cephalus, mullet, was re-confirmed by photo-records. Squalus megalops, cosmopolitan spurdog, was identified by genetic fingerprinting. The two littoral species, P. auriga and M. cephalus, are firmly established in the archipelago and additional information on their occurrence is given. The findings reported in the present contribution may well be the result of a wider sharing of information between fishermen and other seafarers and scientists, rather than an indicator of recent faunal changes.
- The Role of Functional Traits in Structuring Fish Assemblages Across the Four Macaronesia ArchipelagosPublication . Barcelos, Luís; Anderson, Antônio; Freitas, Rui; Barreiros, João PedroABSTRACT: Aim: To investigate how functional traits shape the composition and functional structure of coastal fish assemblages across the four North-East Atlantic archipelagos, providing insights into the ecological drivers of species distributions and trait patterns in oceanic island systems. Location: Four North-East Atlantic oceanic archipelagos within Macaronesia: the Azores, Madeira, Canary Islands and Cabo Verde. Taxon: Coastal marine fishes occurring up to 200 m depth, comprising 682 species. Methods: We compiled a validated checklist of coastal fish species (≤ 200 m depth) for each archipelago and integrated these data with a functional trait matrix comprising size category, trophic category, habitat affinity, milieu and climatic affinity. Generalised Linear Models (GLMs) were used to assess the influence of traits on species occurrences. Functional community structure was quantified using six functional diversity indices: functional richness (FRic), evenness (FEve), divergence (FDiv), dispersion (FDis), Rao's quadratic entropy (RaoQ) and FRic intersection (FRic Inter). Model performance was evaluated using AIC, BIC, pseudo R² and post hoc comparisons. Trait-based GLMs were complemented with assemblage-level RLQ ordination and fourth-corner tests to evaluate trait–environment coupling while accounting for species co-occurrence. Results: Species richness followed a clear latitudinal gradient, peaking in the Canary Islands and declining towards higher latitudes. RLQ revealed strong global trait–environment co-structure (Axis 1 = 91.7% of projected inertia), whereas Fourth-Corner tests detected no individually significant trait–environment associations after Holm correction. RV tests indicated a significant link between trait structure and species composition (Q–L), but not between environmental context and species composition (R–L). Among traits, body size and habitat affinity were the strongest predictors of species occurrences, with larger-bodied and reef-associated species more frequent in the southern archipelagos. Functional richness was highest in the Azores, indicating functional distinctiveness despite comparatively low species richness. Incorporating functional diversity indices into GLMs did not improve explanatory power beyond species-level traits. Main Conclusions: Body size and habitat affinity are key determinants of coastal fish assemblages across the Macaronesia archipelagos. Functional diversity peaks in the Azores, while Madeira exhibits intermediate trait compositions between temperate and tropical systems. These patterns provide insight into community assembly mechanisms and may inform predictions of species turnover under future climate change scenarios.