scholarly journals Shining Light on Priming in Euphotic Sediments: Nutrient Enrichment Stimulates Export of Stored Organic Matter

2020 ◽  
Vol 54 (18) ◽  
pp. 11165-11172
Author(s):  
Philip M. Riekenberg ◽  
Joanne M. Oakes ◽  
Bradley D. Eyre
Keyword(s):  
Organic Matter ◽  
Nutrient Enrichment

scholarly journals Αλλαγές στις θαλάσσιες βακτηριακές κοινότητες σε συνθήκες εμπλουτισμού με θρεπτικά

2014 ◽  
Author(s):  
Στυλιανός Φοδελιανάκης
Keyword(s):  
Organic Matter ◽  
Water Column ◽  
Nutrient Enrichment ◽  
Eastern Mediterranean ◽  
Community Diversity ◽  
Coastal Sediment ◽  
Common Source ◽  
Composition And Structure ◽  
Taxonomic Groups ◽  
Bacterioplankton Communities

Nutrient enrichment is a common source of disturbance for marineecosystems. A prerequisite for the prediction of the effects of nutrient enrichment atthe ecosystem level is the understanding of the ecological mechanisms governingbacterioplankton communities, due to their high affinity with nutrients. The aim ofthis thesis was to examine changes in the composition and structure ofbacterioplankton communities of the water column and coastal sediment undernutrient enrichment. Three studies were conducted for that purpose: two in closedexperimental conditions and one examining changes in situ. In the first two studies,changes in the water column bacterioplankton communities were examined after Paddition and in nutrient enriched habitats, respectively. In the third study, changes inthe communities of coastal sediment were examined with and without the additionof organic matter and aeration of the water column. The main conclusions from theresults of this thesis were:a) Bacterioplankton communities of the Eastern Mediterranean show a high degreeof resistance to short-term P addition, although their biomass and production islimited by P.b) Five abundant taxonomic groups showed a similar pattern of change across threedifferent nutrient enriched habitats. These groups could be potentially used asindicators for monitoring nutrient enrichment at the water column.c) After incubation under presence or absence of organic enrichment, sedimentbacterial communities originating from different habitats clustered based on theincubation conditions rather than on the area of origin. That occurred faster for twoout of the three areas, where the amount of organic matter in the sediment wasinitially higher and bacterial community diversity was lower. These results indirectlysupport the theory of Baas-Becking that "everything is everywhere but theenvironment selects" and the positive correlation between diversity and communitystability.

scholarly journals Response of phytoplankton in an alpine lake to inputs of dissolved organic matter through nutrient enrichment and trophic forcing

2013 ◽  
Vol 58 (3) ◽  
pp. 867-880 ◽  
Author(s):  
Carrie E. H. Kissman ◽  
Craig E. Williamson ◽  
Kevin C. Rose ◽  
Jasmine E. Saros
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Nutrient Enrichment ◽  
Alpine Lake

Autotrophic Production in Carnation Creek, a Coastal Rainforest Stream on Vancouver Island, British Columbia

1976 ◽  
Vol 33 (7) ◽  
pp. 1553-1563 ◽  
Author(s):  
John G. Stockner ◽  
K. R. S. Shortreed
Keyword(s):  
Organic Matter ◽  
Nutrient Enrichment ◽  
Algal Biomass ◽  
Algal Growth ◽  
Nutrient Concentrations ◽  
Herbivorous Insects ◽  
Light Conditions ◽  
Net Production ◽  
Filamentous Green Algae ◽  
Major Loss

Attached algal growth in Carnation Creek and its estuary were monitored in 1974 and 1975 as part of the Carnation Creek Experimental Watershed Project. Net production on the estuary was 17.8 μg organic matter (org)∙cm−2∙day−1, and in Carnation Creek the average was 3.4 μg org∙cm−2∙day−1. Algal growth in Ritherdon Creek, located in an adjacent logged watershed, was slightly higher (4.6 μg org∙cm−2∙day−1) than the Carnation Creek average. In a streamside nutrient enrichment experiment, nitrate and phosphate concentrations in one trough were increased to twice the normal Carnation Creek values present in the control. In 35 days the nutrient-enriched trough had a total algal volume 3 times that of the control. It is suggested that extremely low nutrient concentrations (especially phosphate), and secondarily, poor light conditions under the canopy, are responsible for the paucity of algal growth in Carnation Creek. Major loss of algae from the system is caused by periodic freshets which scour the stream bed. Losses by grazing herbivorous insects were considered negligible. Dominant diatoms in Carnation Creek were Achnanthes minutissima, Synedra ulna, Hannaea arcus, Diatoma hiemale, and Eunotia pectinalis. Ulothrix sp., Draparnaldia sp., and Mougeotia sp. were the dominant filamentous green algae. Net production and algal biomass (chlorophyll a) in Carnation Creek are among the lowest ever reported in the literature.

scholarly journals Stream nutrient enrichment has a greater effect on coarse than on fine benthic organic matter

2013 ◽  
Vol 32 (4) ◽  
pp. 1111-1121 ◽  
Author(s):  
Cynthia J. Tant ◽  
Amy D. Rosemond ◽  
Matthew R. First
Keyword(s):  
Organic Matter ◽  
Nutrient Enrichment ◽  
Benthic Organic Matter

scholarly journals Geologic controls on phytoplankton elemental composition

2021 ◽  
Author(s):  
Shlomit Sharoni ◽  
Itay Halevy
Keyword(s):  
Organic Matter ◽  
Nutrient Enrichment ◽  
Nutrient Content ◽  
Geologic History ◽  
Marine Fauna ◽  
Average Temperature ◽  
Marine Organic Matter ◽  
Phosphate Availability ◽  
Redfield Ratios

Abstract Although the nutrient content of planktonic organic matter (C:N:Porg) plays a crucial role in marine metazoan evolution and global biogeochemistry (1–3), its geologic history is poorly constrained, and it is often regarded as a constant “Redfield” ratio of C:N:Porg~106:16:1. We calculate C:N:Porg through the Phanerozoic by including nutrient- and temperature-dependent C:N:Porg parameterizations (4–6) in a model of long-term biogeochemical cycles (7). We infer a decrease from high Paleozoic C:Porg and N:Porg to present-day Redfield ratios. This gradual nutrient enrichment of marine organic matter stems from a decrease in the global average temperature and an increase in seawater phosphate availability, which are driven by various Phanerozoic events, mainly the middle to late Paleozoic emergence and expansion of land plants and the Triassic breakup of the supercontinent Pangaea. The nutrient enrichment of planktonic organic matter likely impacted the evolution of marine fauna and global biogeochemistry.

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