Desmídias de ambiente fitotelmata bromelícola da Serra da Jiboia, Bahia, Brasil

The present study is a contribution to the taxonomic knowledge of desmids retained in reservoir of leaves of Alcantarea nahoumii (Leme) J.R.Grant (Bromeliaceae) on area of campo rupestre in top of  Morro da Pioneira, north zone of Serra da Jiboia, (12º51'S e 39º28'W), 850m of height, in the Santa Teresinha's county, Bahia, Brazil. The material studied came from 120 samples collected in january and march of 2009 (summer) and june and july of 2009 (winter). The phytotelmata flora was represented by sixteen taxa belonging to the genera: Actinotaenium (1), Cosmarium (9), Euastrum (2), Micrasterias (2) Pleurotaenium (1), Staurastrum (1). Five taxa are new records to Bahia: E. sublobatum var. sublobatum f. elongatum, Micrasterias crux-melitensis, Cosmarium elegantissimum var. elegantissimum f. elegantissimum, Staurastrum leptocladum var. coronatum, C. undulatum var. circulare and being the last one is new records to Brazil.O presente estudo é uma contribuição para o conhecimento taxonômico das desmidias retidas nos imbricamentos das folhas de Alcantarea nahoumii (Leme) J.R.Grant (Bromeliaceae) ocorrentes em área de campo rupestre no cume do Morro da Pioneira, zona norte da Serra da Jiboia (12º51’S e 39º28’W), a 850 m de altitude, município de Santa Teresinha, Bahia, Brasil. Foram coletadas 120 amostras entre janeiro e março (verão) e entre junho e julho de 2009 (inverno). A flora fitotelmica foi representada por dezesseis táxons pertencentes aos gêneros: Actinotaenium (1), Cosmarium (9), Euastrum (2), Micrasterias (2) Pleurotaenium (1), Staurastrum (1). Cinco espécies são referidas pela primeira vez para a Bahia: E. sublobatum var. sublobatum f. elongatum, Micrasterias crux-melitensis, Cosmarium elegantissimum var. elegantissimum f. elegantissimum, Staurastrum leptocladum var. coronatum e C. undulatum var. circulare, esta  última também citação pioneira para o Brasil

Novos registros de algas verdes cocoides (Chlorophyceae, Chlorophyta) para o estado da Bahia e para o Brasil

Twenty-three taxa of coccoid green algae were identified from samples collected in the Marimbus-Iraquara Environmental Protection Area, Chapada Diamantina, Bahia state. Amongst them, 19 are reported for the first time to Bahia state and four are new reports to Brazil: Coenocystis planctonica var. planctonica, C. planctonica var. hercynica, Palmodictyon lobatum and Dispora crucigenioides. This is the first confirmed record of the genus Palmodictyon to the Brazilian territory.A partir de coletas na Área de Proteção Ambiental Marimbus-Iraquara, Chapada Diamantina, Bahia, foram identificados 23 táxons de algas verdes cocoides. Dentre eles, 19 são novas ocorrências para a Bahia e quatro são novos registros para o Brasil: Coenocystis planctonica var. planctonica, C. planctonica var. hercynica, Dispora crucigenioides e Palmodictyon lobatum. Este é o primeiro registro confirmado do gênero Palmodictyon para o território brasileiro

Micrasterias (Zygnematophyceae) de duas áreas do Pantanal dos Marimbus (Baiano e Remanso), Chapada Diamantina, Bahia, Brasil

Foi realizado o inventário do gênero Micrasterias (Zygnematophyceae) em duas áreas alagáveis do Pantanal dos Marimbus (Baiano e Remanso), Chapada Diamantina, Bahia, como contribuição ao conhecimento da desmidioflórula do Estado. Os materiais estudados, de origem perifítica e metafítica, provieram de 120 unidades amostrais coletadas durante o período seco (abril, junho e agosto de 2011) e chuvoso (outubro e dezembro de 2011 e fevereiro de 2012). Foram registrados 15 táxons, sendo 11 comuns a ambos os Marimbus. Os táxons mais frequentes no período seco e no período chuvoso foram M. pinnatifida (Marimbus do Baiano) e M. truncata var. pusilla (Marimbus do Remanso). Com exceção de M. laticeps var. laticeps, 14 táxons tiveram sua distribuição geográfica ampliada para a Chapada Diamantina. Micrasterias tropica var. tropica e M. simplex var. minor são adições à flora ficológica do Nordeste do Brasil

Notas taxonômicas sobre o gênero Nitella C. Agardh (Characeae) da Região Metropolitana de Feira de Santana, Estado da Bahia, Brasil

From a floristic study of the Family Characeae in the Metropolitan Region of Feira de Santana, Bahia State, we detected four species of Nitella, of which two are new additions for that state: N. axillaris, and N. praelonga, the latter being, of rare occurrence in Brazil, reported for the first time for the northeastern Brazil. The materials were analyzed using photonic and scanning electron microscopy. For all these species we provide descriptions, information on habitat, geographic distribution in Brazil and taxonomic notes.A partir de um estudo florístico da Família Characeae na Região Metropolitana de Feira de Santana, Estado da Bahia, detectamos quatro espécies de Nitella, das quais duas são adições para o Estado: N. axillaris e N. praelonga, esta última, de ocorrência rara no Brasil, relatada pela primeira vez para o Nordeste brasileiro. Os materiais foram analisados através de microscopia fotônica e eletrônica de varredura. Para todas essas espécies fornecemos descrições, informações sobre hábitat, distribuição geográfica no Brasil e notas taxonômicas

Euglenophyceae from bromeliad phytotelmata: new records for Bahia state and Brazil

We report 7 new records of Euglenophyceae for Bahia state and 1 for Brazil. The material was collected from bromeliad phytotelmata in 4 areas of Bahia state (Serra da Jiboia, Parque das Dunas, Fazenda Itaberaba, and Reserva Sapiranga) during 14 months from 2014 to 2016. For each species, we provide the description, geographical distribution in Brazil, microhabitat conditions, and frequency of occurrence. The richness was greatest in bromeliads in the Serra da Jiboia (5 species), followed by the Parque das Dunas (3 species), Reserva Sapiranga (2 species), and Fazenda Itaberaba (1 species).&nbsp

Pervasive gaps in Amazonian ecological research

Biodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear un derstanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5–7 vast areas of the tropics remain understudied.8–11 In the American tropics, Amazonia stands out as the world’s most diverse rainforest and the primary source of Neotropical biodiversity,12 but it remains among the least known forests in America and is often underrepre sented in biodiversity databases.13–15 To worsen this situation, human-induced modifications16,17 may elim inate pieces of the Amazon’s biodiversity puzzle before we can use them to understand how ecological com munities are responding. To increase generalization and applicability of biodiversity knowledge,18,19 it is thus crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple or ganism groups in a machine learning model framework to map the research probability across the Brazilian Amazonia, while identifying the region’s vulnerability to environmental change. 15%–18% of the most ne glected areas in ecological research are expected to experience severe climate or land use changes by 2050. This means that unless we take immediate action, we will not be able to establish their current status, much less monitor how it is changing and what is being lostinfo:eu-repo/semantics/publishedVersio

Pervasive gaps in Amazonian ecological research

Biodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear understanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5,6,7 vast areas of the tropics remain understudied.8,9,10,11 In the American tropics, Amazonia stands out as the world's most diverse rainforest and the primary source of Neotropical biodiversity,12 but it remains among the least known forests in America and is often underrepresented in biodiversity databases.13,14,15 To worsen this situation, human-induced modifications16,17 may eliminate pieces of the Amazon's biodiversity puzzle before we can use them to understand how ecological communities are responding. To increase generalization and applicability of biodiversity knowledge,18,19 it is thus crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple organism groups in a machine learning model framework to map the research probability across the Brazilian Amazonia, while identifying the region's vulnerability to environmental change. 15%–18% of the most neglected areas in ecological research are expected to experience severe climate or land use changes by 2050. This means that unless we take immediate action, we will not be able to establish their current status, much less monitor how it is changing and what is being lost

First record of Parvodinium umbonatum (Stein) Carty (Peridiniaceae, Dinophyta) for northeast Brazil

This paper presents the first record of the freshwater dinoflagellate Parvodinium umbonatum (Stein) Carty (Peridiniaceae, Dinophyta) for northeast Brazil, based on samples collected in 2015 from a tank bromeliads at Serra da Jiboia, Bahia. This species was an important component in the local phytotelm community and categorized as frequent in the bromeliads of the area. A description based on morphometrical features, illustrations (LM and SEM), abiotic conditions of the stored water, and geographic distribution of P. umbonatum in Brazil are provided