Primary Productivity in Aquatic Environments.

1967 ◽  
Vol 55 (3) ◽  
pp. 861
Author(s):  
G. E. Fogg ◽  
C. R. Goldman
Keyword(s):  
Primary Productivity ◽  
Aquatic Environments

scholarly journals Microalgal applications in bioindustry

2008 ◽  
Vol 29 (1) ◽  
pp. 30
Author(s):  
Susan Blackburn
Keyword(s):  
Carbon Dioxide ◽  
Primary Productivity ◽  
Renewable Resource ◽  
Arthrospira Platensis ◽  
Bioactive Molecules ◽  
Aquatic Environments ◽  
Blue Green Alga ◽  
Wide Range ◽  
The World ◽  
Aquatic Food

Microalgae are microscopic plants inhabiting the world?s oceans and other aquatic environments. They are critical for the health of the planet, being responsible for at least half of the global primary productivity. Like other photosynthetic (autotrophs) organisms, microalgae capture solar radiation and convert it to chemical energy as biomass, forming the basis of aquatic food webs, fixing carbon dioxide and producing oxygen as part of the process. Other microalgae (heterotrophs) can utilise organic compounds for growth. As single-celled packages of bioactive molecules that can be cultured to produce high levels of biomass, microalgae are a renewable resource with a wide range of applications in bioindustry. Their use is established in the human nutraceutical industry with ?super foods? such as Spirulina from the cyanobacterium (blue green alga) Arthrospira platensis (Figure 1). Intense interest surrounds the development of microalgae as a source of biofuels, and in the mitigation of CO2 and other greenhouse gases (GHG). Other bioactive compounds, as well as genes from microalgae, offer new opportunities for bioindustry.

scholarly journals Effects of primary productivity on beta diversity of ecological communities

2019 ◽  
Vol 31 ◽  
Author(s):  
Leticia Siman Bora ◽  
Juliana Wojciechowski ◽  
Jaqueline Dittrich ◽  
André Andrian Padial
Keyword(s):  
Primary Productivity ◽  
Beta Diversity ◽  
Spatial Scales ◽  
Small Body ◽  
Ecological Factors ◽  
Scientometric Analysis ◽  
Aquatic Environments ◽  
Ecological Communities ◽  
Terrestrial Environments ◽  
Negative Relationships

Abstract Aim Several ecological factors are predicted to affect beta diversity - the dissimilarity of communities among localities or through time. Considering the effect of primary productivity, there is a divergence in the literature concerning if it is positive, negative or hump-shaped. This is relevant considering the discussion on the role of primary productivity on deterministic and stochastic processes shaping ecological communities. The main goal of this study was to review ecological literature to explore causes for variation in the predominant relationship between beta diversity and primary productivity. Methods We have performed a scientometric analysis following the PRISMA statement for systematic reviews and the articles search was made through the ISI Web of Science® database. Results The number of articles approaching the relationship between beta diversity and primary productivity is growing more than expected by the natural growth in published articles. From the 465 articles found, only 38 directly dealt with beta diversity-productivity relationship. From them, we extracted 76 relationships, most of them positive, in almost all factors analyzed. Even so, the proportion of negative studies was higher in aquatic environments. In the Afrotropic region, only negative relationships in terrestrial studies were found. There is a clear inclination towards studies regarding large spatial scales, terrestrial environments, with vertebrates and in the Neartic or Paleartic regions. In aquatic environments there was a clear dominance of studies using small-body organisms, contrasting with terrestrial studies that used more often vertebrates and plants. Conclusions There is an increasing interest in studies concerning this relationship. Positive relations can be explained by several ecological factors, and the more common negative relationships in aquatic environments can be explained by the fact that productivity can cause eutrophication. We also pointed out gaps in the knowledge, especially considering studies in small and medium spatial scales, groups beyond plants and vertebrates in terrestrial environments, and aquatic studies in Afrotropic and Indo – Malaya regions.

scholarly journals Relative influence of direct and indirect environmental effects on sestonic chlorophyll-a concentration in Cerrado streams

2015 ◽  
Vol 27 (3) ◽  
pp. 301-310 ◽  
Author(s):  
Pedro Paulino Borges ◽  
Fabrício Barreto Teresa ◽  
Patrick Thomaz de Aquino Martins ◽  
João Carlos Nabout
Keyword(s):  
Chlorophyll A ◽  
Primary Productivity ◽  
Indirect Effects ◽  
Important Variable ◽  
Native Vegetation ◽  
Aquatic Environments ◽  
Relative Importance ◽  
Direct And Indirect Effects ◽  
Chlorophyll A Concentration ◽  
Land Use And Cover

Abstract Aim: Chlorophyll-a may be directly influenced by local variables and/or indirectly by land use and cover, once landscape modifications change limnological variables, which in turn affect the primary productivity of aquatic environments, e.g., streams. Therefore, the objective of this study was to determine the relative importance of the local and landscape environmental components and assess the direct and indirect effects of these variables on sestonic chlorophyll-a concentration in 30 Cerrado streams (Santa Teresa River basin). Results All aquatic environments were oligotrophic during the study period. Only the local variables were important to explain chlorophyll-a variation (R2 = 0.27; P = 0.04). In addition, the path analysis showed that all variables used in the analysis influenced chlorophyll-a concentration more directly than indirectly. Conductivity was the most important variable to directly influence chlorophyll-a, followed by turbidity. Conclusion The large amount of remnant native vegetation in the basin indicates that the region studied is well preserved, which may explain the greater importance of local variables and the low effect of the landscape in explaining chlorophyll-a variation.

scholarly journals Eelgrass leaf surface microbiomes are locally variable and highly correlated with epibiotic eukaryotes

2017 ◽  
Author(s):  
Mia M. Bengtsson ◽  
Anton Bühler ◽  
Anne Brauer ◽  
Sven Dahlke ◽  
Hendrik Schubert ◽  
...  
Keyword(s):  
Primary Productivity ◽  
Leaf Surface ◽  
Amplicon Sequencing ◽  
Rrna Genes ◽  
Aquatic Environments ◽  
Eelgrass Meadow ◽  
Highly Correlated ◽  
18S Rrna Genes ◽  
Microbiome Assembly ◽  
Sea Coast

ABSTRACTEelgrass (Zostera marina) is a marine foundation species essential for coastal ecosystem services around the northern hemisphere. Like all macroscopic organisms, it possesses a microbiome which may play critical roles in modulating the interaction of eelgrass with its environment. For example, its leaf surface microbiome could inhibit or attract eukaryotic epibionts which may overgrow the eelgrass leading to reduced primary productivity and subsequent eelgrass meadow decline. We used amplicon sequencing of the 16S and 18S rRNA genes of prokaryotes and eukaryotes to assess the leaf surface microbiome (prokaryotes) as well as eukaryotic epibionts in-and outside lagoons on the German Baltic Sea coast. Bacterial microbiomes varied substantially both between sites inside lagoons and between open coastal and lagoon sites. Water depth, leaf area and biofilm chlorophyll a concentration explained a large amount of variation in both bacterial and eukaryotic community composition. Communities of bacterial and eukaryotic epibionts were highly correlated, and network analysis revealed disproportionate co-occurrence between a limited number of eukaryotic taxa and several bacterial taxa. This suggests that eelgrass leaf surface biofilms are a mosaic of the microbiomes of several eukaryotes, in addition to that of the eelgrass itself, and underlines that eukaryotic microbial diversity should be taken into account in order to explain microbiome assembly and dynamics in aquatic environments.

Limnological characteristics, community metabolism and management strategies of a coastal sinkhole in Cuba (Cenote Jennifer)

2020 ◽  
Vol 56 ◽  
pp. 24
Author(s):  
Roberto González-De Zayas ◽  
Liosban Lantigua Ponce de León ◽  
Liezel Guerra Rodríguez ◽  
Felipe Matos Pupo ◽  
Leslie Hernández-Fernández
Keyword(s):  
Hydrogen Sulfide ◽  
Primary Productivity ◽  
Major Ions ◽  
Saline Water ◽  
Management Strategies ◽  
Tourist Destination ◽  
Community Metabolism ◽  
Morphological Studies ◽  
Made In ◽  
Limnological Parameters

The Cenote Jennifer is an important and unique aquatic sinkhole in Cayo Coco (Jardines del Rey Tourist Destination) that has brackish to saline water. Two samplings were made in 1998 and 2009, and 4 metabolism community experiments in 2009. Some limnological parameters were measured in both samplings (temperature, salinity, pH, dissolved oxygen major ions, hydrogen sulfide, nutrients and others). Community metabolism was measured through incubated oxygen concentration in clear and dark oxygen bottles. Results showed that the sinkhole limnology depends on rainfall and light incidence year, with some stratification episodes, due to halocline or oxycline presence, rather than thermocline. The sinkhole water was oligotrophic (total nitrogen of 41.5 ± 22.2 μmol l−1 and total phosphorus of 0.3 ± 0.2 μmol l−1) and with low productivity (gross primary productivity of 63.0 mg C m−2 d−1). Anoxia and hypoxia were present at the bottom with higher levels of hydrogen sulfide, lower pH and restricted influence of the adjacent sea (2 km away). To protect the Cenote Jennifer, tourist exploitation should be avoided and more resources to ecological and morphological studies should be allocated, and eventually use this aquatic system only for specialized diving. For conservation purposes, illegal garbage disposal in the surrounding forest should end.

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