Ricardo G. Bahia

Ricardo G. Bahia
Instituto de Pesquisas Jardim Botânico do Rio de Janeiro · Diretoria de Pesquisas (DIPEQ)

PhD

About

48
Publications
21,573
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1,567
Citations
Citations since 2017
14 Research Items
1142 Citations
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250

Publications

Publications (48)
Article
Full-text available
Rhodolith beds are biogenic benthic habitats mainly formed by unattached, non-geniculate coralline algae, which can be inhabited by many associated species. The Brazilian continental shelf encompasses the largest continuous rhodolith bed in the world. This study was based on samples obtained from seven sites and videos taken by a Remotely Operated...
Article
The euphotic-mesophotic transition is characterized by dramatic changes in environmental conditions, which can significantly alter the functioning of ecosystem engineers and the structure of their associated communities. However, the drivers of biodiversity change across the euphotic-mesophotic transition remain unclear. Here, we investigated the m...
Article
Full-text available
This paper describes Sporolithon franciscanum, a new rhodolith-forming species of non-geniculate coralline algae found at depths between 47–52 m near the São Francisco river mouth, the second largest and the most extensive drainage basin in Brazil, and also at the Abrolhos Bank, in the world´s largest rhodolith beds. DNA sequences from plastidial p...
Article
Full-text available
The world’s largest rhodolith beds have been reported from the Brazilian continental shelf. Highly biodiverse beds are located in Southeast Brazil, but ecological aspects of these beds remain unknown. Despite their ecological importance, rhodolith beds (RBs) have recently been subjected to a severe threat, when more than 35 million cubic meters of...
Article
Full-text available
Two new Melobesioideae, Tectolithon fluminense gen. et sp. nov. and Crustaphytum atlanticum sp. nov., were described based on specimens collected at depths from 2 to 30 m in a tropical to subtropical transitional region of Southeast Brazil. Analyses of the plastid-encoded markers psbA and rbcL demonstrated that these taxonomic novelties belong to t...
Chapter
Reef morphology varies across the depth gradient of tropical shelves and the controlling drivers operate at different geological timescales. For instance, while Holocene sea level rise drowned wide expanses of offshore reefs, modern disturbance (i.e., hurricanes/storm regime) shapes coral and coralline reef morphology. Here we report a regional sca...
Article
Full-text available
DNA sequence analysis of plastid-encoded psbA and rbcL loci, and nuclear-encoded LSU rDNA of rhodolith-forming specimens of Sporolithales from Brazil and the northwestern Gulf of Mexico reveal that they belong to an unnamed species of Sporolithon (Sporolithaceae). Sporolithon amadoi sp. nov. is morpho-anatomically characterized by a vegetative thal...
Article
Modern mixed carbonate and siliciclastic shelves have been described on continental margins around the world. In general, the mixed shelf sedimentation model shows a cross-shelf gradient from terrigenous to carbonate sediments or a shift from the continental shelf to the basin. Here we use acoustic seabed mapping, surface sediment sampling and high...
Chapter
Full-text available
Macroalgae in mesophotic coral ecosystems are generally understudied compared to corals and fishes yet may be more abundant than coral-dominated reefs given their lower depth limits (> 200 m) and ability to grow over soft and hard bottom habitats. These assemblages are abundant and diverse globally, with changing species composition with increasing...
Article
Full-text available
The Atlantic Ocean encompasses approximately 10% of the global carbonate reef area, but the austral limits of coral reef distribution within this basin are still unclear. The lack of reef area and distribution estimates clearly hampers marine spatial planning and management in several regions, especially in the southwestern Atlantic. In this area,...
Article
Full-text available
Crustose calcareous algae (CCA) constitute one of the main reef builders on the Abrolhos Bank, Brazil. Once CCA taxonomy is locally understood, differences in growth-forms may be useful for the delimitation of taxa using characteristics such as the presence or absence of surface protuberances. Here, growth-forms were used to identify and quantify t...
Chapter
The largest continuous latitudinal distribution of rhodolith beds occur in the South Atlantic Ocean. Up to now rhodolith beds were referred exclusively to the western portion of the South Atlantic. Here we describe the recent advances in the South Atlantic taking into account latitudinal distribution, species composition, structure and ecosystem fu...
Article
Full-text available
The Abrolhos Continental Shelf (ACS) encompasses the largest and richest coral reefs in the southern Atlantic Ocean. A taxonomic study of non-geniculate coralline algae (NGCA) from the region was undertaken using both morpho-anatomical and molecular data. Specimens of NGCA were collected in 2012 and 2014 from shallow reefs of the ACS. Phylogenetic...
Article
Full-text available
Rhodolith beds are important marine benthic ecosystems, representing oases of high biodiversity among sedimentary seabed environments. They are found frequently and abundantly, acting as major carbonate ’factories’ and playing a key role in the biogeochemical cycling of carbonates in the South Atlantic. Rhodoliths are under threat due to global cha...
Data
Full-text available
Rhodolith beds are important marine benthic ecosystems, representing oases of high biodiversity among sedimentary seabed environments. They are found frequently and abundantly, acting as major carbonate ‘factories’ and playing a key role in the biogeochemical cycling of carbonates in the South Atlantic. Rhodoliths are under threat due to global cha...
Article
Full-text available
Rhodolith beds are important marine benthic ecosystems, representing oases of high biodiversity among sedimentary seabed environments. They are found frequently and abundantly, acting as major carbonate ’factories’ and playing a key role in the biogeochemical cycling of carbonates in the South Atlantic. Rhodoliths are under threat due to global cha...
Article
Full-text available
The abundance of reef builders, non-builders and the calcium carbonate produced by communities established in Calcification Accretion Units (CAUs) were determined in three Abrolhos Bank shallow reefs during the period from 2012 to 2014. In addition, the seawater temperature, the irradiance, and the amount and composition of the sediments were deter...
Data
Multivariate results (PERMANOVA) after one and two years of colonization of AA to test the effect of colonization time period (1 or 2 years) and/or category (builder and non-builder group) on cover of main groups. Significant differences (p < 0.05) are highlighted in bold. (DOCX)
Data
Multivariate analysis results (PERMANOVA) after one year of colonization at all sites to test the effect of site and year on carbonate production and non-calcareous mass. Significant differences (p < 0.05) are highlighted in bold. (DOCX)
Data
Mineralogy of deposited sediments (%) on the CAU plates (mean ± standard error) in shallow reefs (PL, AA and PA) during 2013–2014. (DOCX)
Data
Taxa and species list of organisms colonizing CAUs, on Abrolhos Bank. (DOCX)
Data
Multivariate analysis results (PERMANOVA) after one year of colonization at all sites to test the effect of site, year and/or category (builder and non-builder group) on cover of main groups. Significant differences (p < 0.05) are highlighted in bold. (DOCX)
Article
Full-text available
Large rivers create major gaps in reef distribution along tropical shelves. The Amazon River represents 20% of the global riverine discharge to the ocean, generating up to a 1.3 × 106–km2 plume, and extensive muddy bottoms in the equatorial margin of South America. As a result, a wide area of the tropical North Atlantic is heavily affected in terms...
Article
Full-text available
Rocas Atoll is the only atoll in the South Atlantic and one of the smallest atolls in the world, and is mainly built by coralline algae. Even being unique in the world, reefs from its mesophotic zone (i.e., >30 m depth) have never been described. For the first time, we surveyed the bottom features of Rocas Atoll mesophotic zone by using side scan s...
Research
Full-text available
Abstract An updated synthesis of cyanobacteria and algae information is presented for Brazil aiming to refine the data gathered to date and evaluate the progress of the biodiversity knowledge about these organisms in the country since the publication of the Catálogo de Plantas e Fungos do Brasil. The results of 2015 showed an increase of 1,250 spec...
Article
The diagnosis of the order Sporolithales is currently restricted to tetrasporangial anatomy. Until recently, there were few reports about gametangial, and more specifically carposporangial material for the Sporolithales. This study provides the first detailed observations of the anatomy of the mature carposporophyte phase from three species of Spor...
Article
Full-text available
The aim of this study was to describe the new rhodolith-forming coralline alga species, Sporolithon yoneshigueae sp. nov., based on both morpho-anatomical and molecular data. Specimens were collected in rhodolith beds between 28 and 66 m depths in northeastern and southeastern Brazil. The new species can be distinguished from all other species of t...
Article
Full-text available
The Abrolhos Bank, encompassing a wide portion of the Brazilian continental shelf, harbors the world's largest rhodolith bed, which plays an important role in calcium carbonate production in the South Atlantic Ocean. Little is known about the community structure and species composition of this habitat. The aim of this study was to test the hypothes...
Article
Full-text available
Apresenta-se uma síntese atualizada de informações sobre algas no Brasil objetivando refinar os dados reunidos até o presente, bem como avaliar os avanços sobre o conhecimento da diversidade de algas no país desde a publicação do Catálogo de Plantas e Fungos do Brasil. Os resultados de 2015 mostraram um acréscimo de 1.250 espécies (35.7%) a um tota...
Article
Full-text available
Crustose Coralline Algae (CCA) are important constituents of tropical coral reef environments throughout the world's oceans, acting as structural reinforcement and recruitment cues. Despite their importance and their ubiquity, very little is known of the biodiversity of CCA in remote areas of the world's oceans. On the Saint Peter and Saint Paul Ar...
Article
Full-text available
Here we describe in detail two crustose coralline red algal (CCA) species newly reported for the southern Atlantic: Porolithon improcerum and Mesophyllum macroblastum. Porolithon improcerum was recorded on the remote oceanic island of Martim Vaz (ca. 1,200 km off the Brazilian Coast) and M. macroblastum on the Cagarras Archipelago (ca. 5 km off the...
Article
Full-text available
Sporolithon molle (Heydrich) Heydrich has previously only been reported from the Red Sea, Arabian Gulf, Indonesia, and eastern Australia. The species is reported for the first time from the Atlantic Ocean where it was found in the remote oceanic island of Trindade, Brazil. This study provides a comparative account of tetrasporic plants from the Atl...
Article
A new species conforming to the generic description of Sporolithon was found forming small (1–3 cm in diameter) rhodoliths at 18–75 m depth on the eastern coast of Brazil. Sporolithon tenue Bahia, Amado-Filho, Maneveldt et W.H. Adey, sp. nov. differs from other species of Sporolithon in having a thin, primary vegetative thallus of only 45–250 μm in...
Article
Full-text available
Rhodoliths are nodules of non-geniculate coralline algae that occur in shallow waters (<150 m depth) subjected to episodic disturbance. Rhodolith beds stand with kelp beds, seagrass meadows, and coralline algal reefs as one of the world's four largest macrophyte-dominated benthic communities. Geographic distribution of rhodolith beds is discontinuo...
Data
Video obtained by ROV showing three areas within the Abrolhos Bank that are typically dominated by rhodolith beds: stations 35 (80 m depth), 48 (67 m depth), and 59 (31 m depth). Note that most of the substrate was covered by live CCA (shades of red) forming rhodoliths. (MOV)
Article
Full-text available
Calcium carbonate production by marine organisms is an essential process in the global budget of $CO_3^{2 - }$ , and coralline reefs are the most important benthic carbonate producers. Crustose coralline algae (CCA) are well recognized as the most important carbonate builders in the tropical Brazilian continental shelf, forming structural reefs and...
Article
Full-text available
The Trindade and Martin Vaz island group (TMVIG) is located at about 1,120 km off the Brazilian coast. Despite its importance, highlighted by the presence of several endemic fish species, the TMVIG lacks detailed information on the structure of fish and benthic assemblages. Presented here is the first quantitative assessment of reef fish and benthi...
Article
Full-text available
Samples corresponding to Sporolithon ptychoides Heydrich were collected in the mesophotic zone (50 m depth) south of Espírito Santo State, Brazil. The collected material presented features characteristic of the species, namely: tetrasporangia of 75–105 × 40–55 µm grouped into sori that are raised above the surrounding vegetative thallus surface; pr...
Article
Full-text available
This study describes the predominantly tropical, subtidal seaweed populations growing on rhodoliths between 4 and 18 m depth in the southern part of Espirito Santo State (Brazil). Qualitative and quantitative sampling revealed species–rich algal communities, comprising 167 species. Three species of rhodophytes represent new records for the Brazilia...
Article
Full-text available
This study describes the predominantly tropical, subtidal seaweed populations growing on rhodoliths between 4 and 18 m depth in the southern part of Espírito Santo State (Brazil). Qualitative and quantitative sampling revealed species-rich algal communities, comprising 167 species. Three species of rhodophytes represent new records for the Brazilia...
Article
Full-text available
The aim of this study was to determine the structure of a rhodolith bed along a depth gradient of 5 to 25 m in the shelf in front of Salvador City, a region of northeastern Brazil. The dimensions, morphology and coralline algae composition of the rhodoliths were analyzed, as well as the vitality, density, and associated flora of the bed at three de...
Article
Full-text available
RESUMO Nas últimas décadas, foram realizados diversos estudos sobre as algas marinhas bentônicas da região de Cabo Frio (RCF), entretanto essa informação está dispersa em publicações avulsas, dissertações e teses. Neste contexto, o objetivo deste trabalho é realizar a revisão da literatura sobre as algas marinhas bentônicas da RCF e fornecer uma li...

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Project (1)
Project
Within the marine benthos, space is an absolute requirement that is often in short or limited supply. On rocky shores, non-geniculate (encrusting) corallines in particular, constitute an ecologically important group of marine organisms that cover much of the primary space. Despite their ubiquity, they are a comparatively poorly understood group of marine algae. The ongoing goal of this project is to investigate and understand the ecological roles that non-geniculate coralline red algae play in a changing environment.