scholarly journals Long-Term Effects of Elevated Co2 on the Population Dynamics of The Seagrass Cymodocea Nodosa: Evidence from Volcanic Seeps

2020 ◽  
Author(s):  
Amrit Kumar Mishra ◽  
Susana Cabaco ◽  
Carmen de los Santos ◽  
Eugenia Apostolaki ◽  
Salvatrice Vizzini ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Elevated Co2 ◽  
Reproductive Output ◽  
Cymodocea Nodosa ◽  
Long Term Effects ◽  
Production Rates ◽  
Population Reconstruction ◽  
Short And Long Term ◽  
First Time

We used population reconstruction techniques to assess for the first time the population dynamics of a seagrass, Cymodocea nodosa, exposed to long-term elevated CO2 near three volcanic seeps and compare them with reference sites away from the seeps. Under high CO2, the density of shoots and of individuals (apical shoots), and the vertical and horizontal elongation and production rates, were higher. Nitrogen effects on rhizome elongation and production rates and on biomass, were stronger than CO2 as these were highest at the location where the availability of nitrogen was highest. At the seep where the availability of CO2 was highest and nitrogen lowest, density of shoots and individuals were highest, probably due to CO2 effects on shoot differentiation and induced reproductive output, respectively. In all three seeps there was higher short- and long-term recruitment and growth rates around zero, indicating that elevated CO2 increases the turnover of C. nodosa shoots.

scholarly journals Population dynamics of Cymodocea nodosa under future ocean scenarios.

2018 ◽  
Author(s):  
Amrit K Mishra
Keyword(s):  
Population Dynamics ◽  
Elevated Co2 ◽  
Marine Ecosystem ◽  
Co2 Enrichment ◽  
Cymodocea Nodosa ◽  
Long Term Effects ◽  
Leaf Production ◽  
Co2 Concentrations ◽  
Carbon Dioxide Co2

Rising carbon dioxide (CO2) concentrations in the atmosphere will increase the average pCO2 level in the world oceans, which will have a knock-on effect on the marine ecosystem. Coastal seagrass communities are predicted to benefit from the increase in CO2 levels, but long-term effects of elevated CO2 on seagrass communities are less understood. Population reconstruction techniques were used to investigate the population dynamics of Cymodocea nodosa meadows, exposed to long term elevated CO2 at volcanic seeps off Greece and Italy. Effect of elevated CO2 was noticed on the growth, morphometry, density, biomass and age structure at CO2 seeps than reference sites. Above to below ground biomass ratio of C. nodosa were higher at CO2 seeps. The shoot age and shoot longevity of plants were lower at seeps. The present recruitment (sampled year) of the seagrass were higher than long-term average recruitment of the communities near the seeps. Carbon to nitrogen ratios (%DW) and annual leaf production of C. nodosa were higher in leaves at seeps. This study suggests under long-term CO2 enrichment C. nodosa production increases, but the plant survival rate decreases because of other co-factors such as nutrient availability and trace metal toxicity. Therefore, along with high CO2 other factors must be taken into consideration while predicting effects of future CO2 concentrations.

scholarly journals Long-term effects of elevated CO2 on the population dynamics of the seagrass Cymodocea nodosa: Evidence from volcanic seeps

2020 ◽  
pp. 111824
Author(s):  
A.K. Mishra ◽  
S. Cabaço ◽  
C.B. de los Santos ◽  
E.T. Apostolaki ◽  
S. Vizzini ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Elevated Co2 ◽  
Cymodocea Nodosa ◽  
Long Term Effects

scholarly journals Long-term complications of COVID-19; an updated mini-review to the current knowledge

2021 ◽  
Vol 6 (1) ◽  
pp. e14-e14
Author(s):  
Fatemeh Shafieyeh ◽  
Mahsa Heydari
Keyword(s):  
Pulmonary Fibrosis ◽  
Behavioral Disorders ◽  
Current Knowledge ◽  
Cardiovascular Complications ◽  
Long Term Effects ◽  
Adequate Information ◽  
The World ◽  
Short And Long Term ◽  
First Time

In December 2019, China announced the discovery of a new coronavirus for the first time. This event has since affected the lives of people all over the world. Numerous studies have been conducted to identify the short and long-term complications of this disease. Considering the novelty of COVID-19, scientists do not have adequate information about the long-term complications of this disease; however, these long-term effects are very similar to those of other coronaviruses. researchers have recommended monitoring of COVID-19 recovered patients for identification of the long-term complications of the disease. Long-term symptoms are referred to as "long COVID/post-COVID syndrome", and people with these symptoms are called the "long haulers". This article gives a brief review of long-term complications of covid-19 like extreme fatigue, pulmonary fibrosis, cardiovascular complications, sensory and behavioral disorders, smell and taste dysfunctions.

SHORT- AND LONG-TERM EFFECTS OF FOREST SPRAYING OF CARBARYL (SEVIN-4-OIL®) ON STREAM INVERTEBRATES

1980 ◽  
Vol 112 (3) ◽  
pp. 271-276 ◽  
Author(s):  
David L. Courtemanch ◽  
K. Elizabeth Gibbs
Keyword(s):  
Spruce Budworm ◽  
Long Term Effects ◽  
Stream Invertebrates ◽  
Short And Long Term ◽  
First Time

AbstractThe effect on stream invertebrates of carbaryl (Sevin-4-oil®) applied at a rate of 840 g A.I./ha for spruce budworm suppression in Maine was studied. Three streams in each of three different treatment areas were monitored: streams in areas sprayed with carbaryl for the first time, streams in areas sprayed 2 consecutive years, and streams in unsprayed areas.Initial postspray response was an increase in drift up to 170× in treated streams. Benthos samples showed significant declines among Plecoptera, Ephemeroptera, and Trichoptera on subsequent sampling dates. Plecoptera did not repopulate any treated stream by 60 days after treatment. Streams treated for the second consecutive year had very low prespray Plecoptera populations compared with those unexposed to carbaryl. Diptera, with the exception of Microtendipes, and Oligochaeta were unaffected.

Saskatchewan Highways and Transportation Reduced Tire Pressure Initiative

1997 ◽  
Vol 1589 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Thomas L. Davies ◽  
Tami F. Wall ◽  
Allan Carpentier
Keyword(s):  
High Speed ◽  
Membrane Surface ◽  
Vehicle Stability ◽  
Road Maintenance ◽  
Long Term Effects ◽  
Tire Pressure ◽  
Reduced Pressure ◽  
Maintenance Costs ◽  
Short And Long Term

After examination of the research carried out by other agencies, Saskatchewan Highways and Transportation (SHT) embarked on an initiative to adapt low tire pressure technologies to the province's needs and environment. The focus of the initiative was to explore several technical questions from SHT's perspective: (a) Can low tire pressures be used to increase truck weights from secondary to primary without increasing road maintenance costs on thin membrane surface roads? (b) What are the short- and long-term effects of tire heating under high-speed/high-deflection constant reduced pressure (CRP) operations in a Saskatchewan environment? (c) What effects do lower tire pressures have on vehicle stability at highway speeds? To date, significant opportunities have been noted on local hauls (less than 30 min loaded at highway speeds) for CRP operation and long primary highway hauls that begin or end in relatively short secondary highway sections that limit vehicle weight allowed for the whole trip for central tire inflation technology. The background and environment for the initiative and the investigations and demonstrations envisioned and undertaken are briefly outlined.

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