scholarly journals Effects of seagrass overgrazing on sediment erosion and carbon sink capacity: Current understanding and future priorities

2021 ◽  
Author(s):  
Martin Dahl ◽  
Mats Björk ◽  
Martin Gullström
Keyword(s):  
Carbon Sink ◽  
Current Understanding ◽  
Sediment Erosion ◽  
Sink Capacity ◽  
Capacity Current

scholarly journals Low Carbon sink capacity of Red Sea mangroves

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Hanan Almahasheer ◽  
Oscar Serrano ◽  
Carlos M. Duarte ◽  
Ariane Arias-Ortiz ◽  
Pere Masque ◽  
...  
Keyword(s):  
Red Sea ◽  
Carbon Sink ◽  
Low Carbon ◽  
Sink Capacity

scholarly journals CO<sub>2</sub> and nutrient-driven changes across multiple levels of organization in <i>Zostera noltii</i> ecosystems

2014 ◽  
Vol 11 (4) ◽  
pp. 5239-5274 ◽  
Author(s):  
B. Martínez-Crego ◽  
I. Olivé ◽  
R. Santos
Keyword(s):  
Organic Matter ◽  
Carbon Sink ◽  
Co2 Enrichment ◽  
Population Level ◽  
Zostera Noltii ◽  
Biological Organization ◽  
Seagrass Meadows ◽  
Plant Biochemistry ◽  
Sink Capacity ◽  
High Nutrient

Abstract. Increasing evidence emphasizes that the effects of human impacts on ecosystems must be investigated using designs that incorporate the responses across levels of biological organization as well as the effects of multiple stressors. Here we implemented a mesocosm experiment to investigate how the effects of CO2 enrichment and its interaction with eutrophication, scale-up from changes in primary producers at the individual- (biochemistry) or population-level (production, reproduction, and/or abundance) to higher levels of community (macroalgae abundance, herbivory, and global metabolism) and ecosystem organization (detritus release and carbon sink capacity). The responses of Zostera noltii seagrass meadows growing in low- and high- nutrient field conditions were compared. In both meadows, the effect of elevated CO2 levels was mediated by epiphyte proliferation (mostly the cyanobacterium Microcoleus spp.), but not through changes in plant biochemistry or population-level traits. In the low-nutrient meadow, epiphyte proliferation suppressed the CO2 benefits on Z. noltii leaf production and led to increased detritus and decreased organic matter in sediment. Faster and stronger responses to nutrients than to CO2 were observed. Nutrient addition enhanced the nutritional quality of Z. noltii (high N, low C : N and phenolics) and the loss of leaves and shoots, while promoted the proliferation of pennate diatoms and purple bacteria. These changes led to a reduced sediment organic matter, but had no significant effects on herbivory nor on community metabolism. Interestingly, the interaction with CO2 attenuated eutrophication effects. In the high-nutrient meadow, a striking shoot decline caused by amphipod overgrazing was observed, with no response to CO2 and nutrient additions. Our results reveal that under future scenarios of CO2, the responses of seagrass ecosystems will be complex, being mediated by epiphyte proliferation rather than by effects on plant biochemistry. The multi-level responses of the system to nutrients overwhelmed those to CO2 enrichment, but the interaction between stressors reduced the effects of eutrophication. Both, CO2 and nutrient enrichments can reduce the carbon sink capacity of seagrass meadows.

Nutrient addition increases rotifer abundance and diversity in a temperate bog

2020 ◽  
Vol 194 (2) ◽  
pp. 77-83
Author(s):  
Leszek A. Błędzki ◽  
Jill L. Bubier ◽  
Tim R. Moore ◽  
Sari Juutinen
Keyword(s):  
Interstitial Water ◽  
Carbon Sink ◽  
Species Abundance ◽  
Ecological Role ◽  
Decomposition Rates ◽  
Sink Capacity ◽  
Abundance And Diversity ◽  
P Addition

Rotifers are among the smallest metazoan animals living in lakes, ponds, rivers and in interstitial water within Sphagnum mats. When in sufficient numbers they are capable of regenerating large amounts of nitrogen (N) as NO3 and NH4 and phosphorus (P) as PO4; all of these nutrients are immediately available to bog plants. The ecological role of rotifers in bog ecosystems has been recognized at both local and global scales, but the effect of N and P addition on rotifers in bogs remains unknown. Here we present data on the influence of N and P addition on rotifers at a temperate Canadian bog dominated by Sphagnum mosses. We found that rotifer species abundance and diversity were significantly higher in surficial pore water after long-term exposure to increased N and P addition than in the control. A change in plant species distribution and increased rotifer abundance may partly explain the faster decomposition rates, jeopardizing the carbon sink capacity of bogs.

Calculation of Terrestrial Carbon Sink Capacity in Dongying City, Shandong Province

2013 ◽  
Vol 734-737 ◽  
pp. 1901-1904
Author(s):  
Zi Jun Li
Keyword(s):  
Carbon Sink ◽  
Environmental Crisis ◽  
Low Carbon ◽  
Wetland Ecosystem ◽  
Terrestrial Carbon ◽  
Sink Capacity ◽  
Excessive Consumption ◽  
Rapid Transition ◽  
Terrestrial Carbon Sink ◽  
Dongying City

Based on the reality of Dongying City, combined with relevant statistical data, the carbon sink capacity of the forest ecosystem, wetland ecosystem, landscaping ecosystem and farmland ecosystem in Dongying City was calculated systematically by using the empirical coefficient method. The results showed that the carbon sink capacity of terrestrial ecological system in Dongying City was about 596.72×104 t CO2 in 2009, and wetland ecosystem, whose carbon sink capacity accounted for 84.82% of the total terrestrial carbon sink, was the major terrestrial carbon sink of Dongying City. The research results have important significance for Dongying City in rapid transition to low carbon ecological development, mitigating and avoiding the environmental crisis resulted from high carbon development as well as resources crisis caused by energy excessive consumption, and realizing sustainable development.

scholarly journals Seagrass community metabolism: Assessing the carbon sink capacity of seagrass meadows

2010 ◽  
Vol 24 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Carlos M. Duarte ◽  
Núria Marbà ◽  
Esperança Gacia ◽  
James W. Fourqurean ◽  
Jeff Beggins ◽  
...  
Keyword(s):  
Carbon Sink ◽  
Community Metabolism ◽  
Seagrass Meadows ◽  
Seagrass Community ◽  
Sink Capacity
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