Trophic state of an urban coastal lagoon (northern Brazil), seasonal variation of the phytoplankton community and environmental variables

2019 ◽  
Vol 216 ◽  
pp. 98-109 ◽  
Author(s):  
Marco Valério Jansen Cutrim ◽  
Francinara Santos Ferreira ◽  
Ana Karoline Duarte dos Santos ◽  
Lisana Furtado Cavalcanti ◽  
Bethânia de Oliveira Araújo ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Coastal Lagoon ◽  
Environmental Variables ◽  
Trophic State ◽  
Phytoplankton Community ◽  
Northern Brazil

scholarly journals Influência de Variáveis Ambientais na Comunidade Fitoplanctônica nos Reservatórios Receptores do Projeto de Integração do Rio São Francisco (The Influence of Environmental Variables on Phytoplankton Community of the Receptors Reservoirs by the São...)

2013 ◽  
Vol 5 (6) ◽  
pp. 1300
Author(s):  
Gustavo Melo ◽  
Manuela Morais ◽  
Maria Do Carmo Sobral ◽  
Günter Gunkel ◽  
Renata Carvalho
Keyword(s):  
Environmental Variables ◽  
Phytoplankton Community ◽  
Multivariate Statistical ◽  
Sao Francisco River ◽  
Microbiological Characteristics ◽  
Physico Chemical ◽  
São Francisco River ◽  
Pressure Variable ◽  
Brazilian Northeast ◽  
Integration Project

O objetivo do presente trabalho é avaliar as características físico-químicas e microbiológicas dos reservatórios da região do semiárido brasileiro, receptores de água do Projeto de Integração do rio São Francisco, identificando a influência de variáveis ambientais na comunidade fitoplanctônica. Foram estudados os reservatórios de Itaparica, Poço da Cruz, Boqueirão, Armando Ribeiro Gonçalves e Castanhão. Para alcançar o objetivo proposto, foram feitas análises estatísticas multivariadas com auxílio dos programas Primer e SPSS. Verificou-se que os reservatórios se diferenciam em dois grupos (Eixo Leste e Eixo Norte), observando-se a existência de uma variação temporal. As variáveis ambientais explicaram 78% da variação do fitoplâncton. Destes 22% são explicados por variáveis tipológicas (naturais) e 56% são explicados por variáveis de pressão (efeito antropogênico). Espera-se que a transferência de água possa contribuir para melhoria da qualidade da água, sendo fundamental a implementação de medidas que promovam uma gestão integrada e sustentável das respectivas bacias hidrográficas. Palavras-chave: variáveis ambientais, fitoplâncton, reservatórios, semiárido The Influence of Environmental Variables on Phytoplankton Community of the Receptors Reservoirs by the São Francisco River Integration Project ABSTRACT This study aims to evaluate the physico-chemical and microbiological characteristics of brazilian northeast reservoirs, from the São Francisco river Integration Project, to identify the influence of environmental variables on the phytoplankton community. There were studied the reservoirs of Itaparica, Poço da Cruz, Boqueirão, Armando Ribeiro Gonçalves and Castanhão. To achieve the proposed aim, multivariate statistical analyses were performed with the Primer and SPSS programs. It was observed that the reservoirs are distinguish in two groups (East and North Axis), observing the existence of a temporal variation. It was verified that the environmental variables explained 78% of the phytoplankton variation. Of these, 22% are explained by typological variables and 56% are explained by pressure variable. It is expected that the transfer of water may improve water quality (especially in reservoirs of the East Axis). It is essential to implement actions to promote an integrated and sustainable management of their watersheds. Keywords: environmental variables, phytoplankton, reservoirs, semiarid

scholarly journals Two decades of oligotrophication: Evidence for a phytoplankton community shift in the coastal lagoon of Thau (Mediterranean Sea, France)

2020 ◽  
Vol 241 ◽  
pp. 106810 ◽  
Author(s):  
Valérie Derolez ◽  
Dominique Soudant ◽  
Nathalie Malet ◽  
Claude Chiantella ◽  
Marion Richard ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Coastal Lagoon ◽  
Phytoplankton Community ◽  
Community Shift

scholarly journals Space Is More Important than Season when Shaping Soil Microbial Communities at a Large Spatial Scale

mSystems ◽  
2020 ◽  
Vol 5 (3) ◽  
Author(s):  
Kaoping Zhang ◽  
Manuel Delgado-Baquerizo ◽  
Yong-Guan Zhu ◽  
Haiyan Chu
Keyword(s):  
Seasonal Variation ◽  
Microbial Community ◽  
Spatial Scale ◽  
Environmental Variables ◽  
Soil Microbial Communities ◽  
Spatiotemporal Variation ◽  
Relative Importance ◽  
Large Spatial Scale ◽  
Environmental Covariates ◽  
Soil Microbial

ABSTRACT The relative importance of spatial and temporal variability in shaping the distribution of soil microbial communities at a large spatial scale remains poorly understood. Here, we explored the relative importance of space versus time when predicting the distribution of soil bacterial and fungal communities across North China Plain in two contrasting seasons (summer versus winter). Although we found that microbial alpha (number of phylotypes) and beta (changes in community composition) diversities differed significantly between summer and winter, space rather than season explained more of the spatiotemporal variation of soil microbial alpha and beta diversities. Environmental covariates explained some of microbial spatiotemporal variation observed, with fast-changing environmental covariates—climate variables, soil moisture, and available nutrient—likely being the main factors that drove the seasonal variation found in bacterial and fungal beta diversities. Using random forest modeling, we further identified a group of microbial exact sequence variants (ESVs) as indicators of summer and winter seasons and for which relative abundance was associated with fast-changing environmental variables (e.g., soil moisture and dissolved organic nitrogen). Together, our empirical field study’s results suggest soil microbial seasonal variation could arise from the changes of fast-changing environmental variables, thus providing integral support to the large emerging body of snapshot studies related to microbial biogeography. IMPORTANCE Both space and time are key factors that regulate microbial community, but microbial temporal variation is often ignored at a large spatial scale. In this study, we compared spatial and seasonal effects on bacterial and fungal diversity variation across an 878-km transect and found direct evidence that space is far more important than season in regulating the soil microbial community. Partitioning the effect of season, space and environmental variables on microbial community, we further found that fast-changing environmental factors contributed to microbial temporal variation.

Influences of Environmental Variables on Neurotransmission, Oxidative System, and Hypoxia Signaling on Two Clam Species from a Mediterranean Coastal Lagoon

2016 ◽  
Vol 35 (1) ◽  
pp. 41-49 ◽  
Author(s):  
Maria Maisano ◽  
Antonino Natalotto ◽  
Tiziana Cappello ◽  
Alessia Giannetto ◽  
Sabrina Oliva ◽  
...  
Keyword(s):  
Coastal Lagoon ◽  
Environmental Variables ◽  
Oxidative System ◽  
Mediterranean Coastal Lagoon ◽  
Hypoxia Signaling

scholarly journals Fish assemblage in a temperate estuary on the uruguayan coast: seasonal variation and environmental influence

2010 ◽  
Vol 58 (4) ◽  
pp. 299-314 ◽  
Author(s):  
Alicia Acuña Plavan ◽  
Cecilia Passadore ◽  
Luis Gimenez
Keyword(s):  
Seasonal Variation ◽  
Environmental Variables ◽  
Fish Community ◽  
Community Dynamics ◽  
Environmental Influence ◽  
Abundant Species ◽  
Multivariate Techniques ◽  
Micropogonias Furnieri ◽  
Definition Of ◽  
Paralichthys Orbignyanus

The seasonal dynamics of the fish community in the Pando estuary on the Uruguayan coast were studied in relation to environmental sampled monthly between May 2002 and June 2003. Individuals collected were identified, and classified into stages (juveniles, adults) and functional groups. Relationships between community dynamics and environmental variables were evaluated using uni- and multivariate techniques. Twenty-one species, mostly freshwater stragglers, estuarine and marine migrants were collected. The most abundant species were Micropogonias furnieri, Mugil platanus, Paralichthys orbignyanus and Brevoortia aurea and were represented by juveniles. The community varied seasonally with rapid shifts in spring and autumn associated with changes in temperature and salinity. Significant correlations between abundance and temperature may be related to the timing of life cycle events. In this estuary, the salinity appears to play a key role in the functional structure and in the use of the habitat by juveniles. This is relevant for the definition of estuaries as nursery areas: this definition is context-dependent and is determined by the salinity conditions.

Sign in / Sign up

Export Citation Format

Share Document