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November 2020 - November 2024
Publications
Publications (33)
Simple filamentous cyanobacteria comprise a diverse and polyphyletic group of species, primarily in the orders Leptolyngbyales and Oscillatoriales, that need more sampling to improve their taxonomy. Oceanic islands, such as the Azores archipelago, present unique habitats and biogeographic conditions that harbor an unknown range of diversity of micr...
The taxonomy of cyanobacteria has advanced quickly with the use of molecular methods in combination with well-defined morphological and ecological characters. Using this approach, many taxonomical changes have occurred in the Synechococcales and Oscillatoriales, with the description of new families, genera and species. Here we present the study of...
Coccoid cyanobacteria represent an important part of cyanobacterial freshwater diversity, with many studied strains in public databases identified as Synechococcus. This is a diverse genus, both morphologically and ecologically, with a global distribution. However, many of the so-called Synechococcus-like cyanobacteria strains could represent sever...
Cyanobacteria are rich producers of secondary metabolites, excreting some of these to the culture media. However, the exometabolome of cyanobacteria has been poorly studied, and few studies have dwelled on its characterization and bioactivity assessment. In this work, exometabolomes of 56 cyanobacterial strains were characterized by HR-ESI-LC-MS/MS...
This field guide aims to give a general overview of the Azorean marine biodiversity,
with emphasis on native species that can be easily observed both at coastal
and epipelagic environments. However, some non-native species are also described
when commonly observed in our marine environments. Species are organised
in the book by the evolutionary seq...
The Tolypotrichaceae is a well-defined family within the filamentous heterocyst-forming cyano-bacteria. However, the morphological and genetic similarity of some of its genera is very high, making the taxonomic assessment and the description of new taxa in this family challenging. Here we describe six strains of Tolypothrix-like cyanobacteria that...
The morphological plasticity of cyanobacteria and their widespread ecological dominance in a wide range of habitats highlights the need for in-depth taxonomic studies. This work focused on the taxonomical revision of Leptolyngbya (Cyanophyceae) strains deposited in the ESSACC culture collection and their metabolomic characterization. Although the s...
Knowledge about cyanobacteria diversity in the Azores is spread over several publications, dating from 1874, with some of them not generally available to the scientific community due to their restricted access. The dispersion and sometimes inaccessibility of this information hinder a deeper analysis and a better understanding of the biodiversity of...
Microcystins (MCs), Saxitoxins (STXs), and Cylindrospermopsins (CYNs) are some of the more well-known cyanotoxins. Taking into consideration the impacts of cyanotoxins, many studies have focused on the identification of unknown cyanotoxin(s)-producing strains. This study aimed to screen strains from the Azorean Bank of Algae and Cyanobacteria (BACA...
Eutrophication and global climate change gather advantageous conditions for cyanobacteria proliferation leading to bloom formation and cyanotoxin production. In the Azores, eutrophication is a major concern, mainly in lakes where fertilizers and organic matter discharges have increased nutrient concentration. In this study, we focused on understand...
Cyanobacteria are among the most diverse morphological microorganisms that inhabit a great variety of habitats. Their presence in the Azores, a volcanic archipelago of nine islands in the middle of the North Atlantic Ocean, has already been reported. However, due to the high diversity of cyanobacteria habitats, their biodiversity is still understud...
Cyanobacteria are diverse, complex and a unique group of microorganisms that inhabit a wide variety of environments. Contrarily to continental areas, studies on cyanobacteria in islands are scarce and need to be reinforced, since climate change impacts are expected to be harsher in islands, due to their geographical isolation and higher exposition...
The Azores are oceanic islands located in the Northern Atlantic Ocean and are particularly rich in aquatic systems, ranging from freshwater, brackish, marine and thermal habitats. Due to the increase in local anthropogenic pressures and global warming, several azorean
lakes began to reveal signs of eutrophication that led to the implementation of m...
Cyanobacteria from freshwater lakes in the Azores Archipelago, Portugal
The data present here come from samples collected during several monitoring programs developed between 1996 and 2018 which aimed to characterize the biodiversity of inland aquatic ecosystems (lakes and streams) from the islands of Santa Maria, São Miguel, Terceira, Pico, São Jo...
The Azores have a singular biota, mainly due to the unique character of the oceanic
islands ecosystems and the diversity of habitats found in the archipelago, including
freshwater, terrestrial, thermal and marine environments. The high diversity and
quantity of suitable habitats for the development of microalgae and cyanobacteria
makes the Azores a...
Cyanobacteria can be found in a variety of habitats, including freshwater, marine, terrestrial and extreme environments (e.g. temperature, salinity). Their presence in the Azores has been reported for more than a century, however, very little is known about their biodiversity and toxin production. Due to environmental factors, such as geographic is...
The study of cyanobacteria from the Azores islands started in the late XIX and early XX centuries, when the islands were visited by several naturalists during the scientific expeditions crossing the Atlantic Ocean. However, at that time only a few sites were sampled and very few species were found. More recently, due to anthropogenic impacts, lake...
Microalgae and cyanobacteria represent an enormous reserve of genetic and functional diversity. They are important sources of bioactive molecules with multiple biotechnological applications in pharmacology, food technology, agriculture, among others. Macaronesian islands have a high biodiversity, and endemism is common. This is mainly due to the di...
The cyanobacteria, photosynthetic prokaryotes that are common inhabitants of inland waters, are increasingly considered an important and rich source of secondary metabolites with diverse biological activities, such as anticancer, antibacterial, antifungal, anti-inflammatory, etc., leading to an increase of bioprospecting in these organisms. In the...
Cyanobacteria are recognized as producers of a wide range of secondary metabolites, which led to
an increase in the search for biologically active compounds in these microorganisms. Although the
Azores islands are rich in lakes and thermal waters inhabited by diverse cyanobacteria assemblages
and may have a distinct cyanobacteria species compositio...
Cyanotoxins are secondary metabolites produced by cyanobacteria, such as microcystins and saxitoxins. These toxins are harmful to environmental and public health and have been responsible for the poisoning of animals and humans who ingest or come into contact with toxic blooms. Surveillance of the aquatic ecosystems is therefore obligatory, and met...
The Azorean islands are rich in freshwaters, such as springs, streams, wetlands and lakes, which are hotspots of biodiversity. Cyanobacteria are amongst the most diverse group of microorganisms that inhabit these ecosystems. Especially in lakes, as result of eutrophication, cyanobacteria have become the dominant group. They produce a wide diversity...
Nas últimas décadas a densidade de cianobactérias e a frequência dos seus blooms nas lagoas dos Açores registou um aumento significativo. Reconhecendo a importância das cianobactérias e suas toxinas nas águas superficiais, foi implementado um programa de monitorização das lagoas do arquipélago em que é determinada a concentração de microcistinas po...
