Response of mollusc assemblages to climate variability and anthropogenic activities: a 4000-year record from a shallow bar-built lagoon system

2013 ◽  
Vol 19 (10) ◽  
pp. 3024-3036 ◽  
Author(s):  
Robert M. Cerrato ◽  
Philip V. LoCicero ◽  
Steven L. Goodbred
Keyword(s):  
Climate Variability ◽  
Anthropogenic Activities ◽  
Lagoon System ◽  
Mollusc Assemblages

scholarly journals Runoff changes and their potential links with climate variability and anthropogenic activities: a case study in the upper Huaihe River Basin, China

2015 ◽  
Vol 46 (6) ◽  
pp. 1019-1036 ◽  
Author(s):  
Ye Zhu ◽  
Wen Wang ◽  
Yi Liu ◽  
Hongjie Wang
Keyword(s):  
Climate Variability ◽  
River Basin ◽  
Human Activities ◽  
Anthropogenic Activities ◽  
Change Point Detection ◽  
Huaihe River Basin ◽  
Huaihe River ◽  
Runoff Changes ◽  
Change Period ◽  
The Individual

The impacts of climate variability and anthropogenic activities on hydrological processes have been of wide concern in the hydrology community during recent decades. In this study, specific investigations of individual impacts of climate variability and anthropogenic activities on runoff during 1964–2010 are conducted for the upper Huaihe River Basin at Huaibin (HB) and its five sub-catchments. The non-stationary relationship between precipitation and runoff was firstly analyzed, and according to change point detection results, long-term series for each catchment was divided into pre-change period and post-change period, respectively. Then, the climate variability and human activities that occurred in the whole HB catchment were analyzed. Finally, using two quantitative evaluation methods, the individual impacts of climate variability and human activities for each catchment were assessed. The results showed that for the whole HB catchment, runoff changes during the whole post-change period are mainly attributed to climate variability, as for its sub-catchments except the Xinxian catchment. As for decadal behaviors, runoff generally suffered more human-induced impacts in dry decades (1990s) than wet decades (1980s and 2000s). These results reflected the complex role of climate variability and human activities in influencing the runoff regime, which could be considered in local water resources management.

Reconstruction of anthropogenic environmental changes from a Cuban coral over the last 175 years

2020 ◽  
Author(s):  
Marie Harbott ◽  
Henry C. Wu ◽  
Henning Kuhnert ◽  
Simone A. Kasemann ◽  
Carlos Jimenez ◽  
...  
Keyword(s):  
Climate Variability ◽  
Ocean Circulation ◽  
Environmental Changes ◽  
Anthropogenic Activities ◽  
Regional Climate ◽  
Florida Current ◽  
Loop Current ◽  
Carbonate Chemistry ◽  
Important Region ◽  
Warm Surface Water

<p>Ocean warming and ocean acidification (OA) are increasingly influencing marine life. Parts of the increasing amount of CO<sub>2</sub> in the atmosphere will eventually get absorbed by the ocean, which changes the oceans carbonate chemistry and threatens the ecological competitiveness of calcareous marine organisms. Currently,  the global coverage of studies on the development of pH since preindustrial times is sparse. An important region to study environmental and climate variations is the northwestern coastal part of Cuba where the Loop Current (LC) joins the Florida Current and contributes to the Gulf Stream. The tropical Atlantic is a primary region for the formation of warm surface water of the thermohaline ocean circulation and the Caribbean in particular as a habitat for coral reefs in the Atlantic making them susceptible to changes in water temperatures and carbonate chemistry. This provides a unique chance to study multiple aspects of the implications of anthropogenic activities such as changes in SST, ocean pH, and carbonate chemistry using the coral skeletal geochemistry as an archive of climate and environmental changes. Here we present results from a multi-proxy approach for the reconstruction of environmental change and natural climate variability from a North Cuban Siderastrea siderea coral. The sub-seasonally resolved records indicate interannual to decadal changes in SST and seawater carbonate chemistry since 1830 CE. The comparison with pH will provide clues on whether the regional climate variability has been directly affected by atmospheric CO<sub>2</sub> forcing.</p>

scholarly journals Integrated assessment of the impacts of climate variability and anthropogenic activities on river runoff: a case study in the Hutuo River Basin, China

2016 ◽  
Vol 48 (2) ◽  
pp. 416-430 ◽  
Author(s):  
Abubaker Omer ◽  
Weiguang Wang ◽  
Amir K. Basheer ◽  
Bin Yong
Keyword(s):  
Land Use ◽  
Water Resources ◽  
Climate Variability ◽  
River Basin ◽  
Assessment Tool ◽  
Anthropogenic Activities ◽  
Interactive Effect ◽  
River Basins ◽  
Runoff Reduction ◽  
Sustainable Water Resources Management

Understanding the linear and nonlinear responses of runoff to environmental change is crucial to optimally manage water resources in river basins. This study proposes a generic framework-based hydrological model (Soil and Water Assessment Tool (SWAT)) and two approaches, to comprehensively assess the impacts of anthropogenic activities and climate variability on runoff over the representative Hutuo River Basin (HRB), China. Results showed that SWAT performed well in capturing the runoff trend in HRB; however, it exhibited better performance for the calibration period than for the validation. During 1961–2000, about 26.06% of the catchment area was changed, mainly from forest to farmland and urban, and the climate changed to warmer and drier. The integrated effects of the anthropogenic activities and climate variability decreased annual runoff in HRB by 96.6 mm. Direct human activities were responsible for 52.16% of runoff reduction. Climate (land use) decreased runoff by 45.30% (2.06%), whereas the combined (land use + climate) impact resulted in more runoff decrease, by 47.84%. Land use–climate interactive effect is inherent in HRB and decreased runoff by 1.02%. The proposed framework can be applied to improve the current understanding of runoff variation in river basins, for supporting sustainable water resources management strategies.

scholarly journals Bivalve mollusk assemblages on São Paulo's northern continental shelf, southeast Brazil

2005 ◽  
Vol 65 (4) ◽  
pp. 717-727 ◽  
Author(s):  
A. Soares-Gomes ◽  
A. M. S. Pires-Vanin
Keyword(s):  
Clustering Analysis ◽  
Biological Diversity ◽  
Permutation Test ◽  
Anthropogenic Activities ◽  
Austral Summer ◽  
Trophic Groups ◽  
Depth Gradient ◽  
Soft Bottom ◽  
Analysis Of Similarity ◽  
Mollusc Assemblages

Soft bottom bivalve mollusc assemblages were sampled along a depth gradient (10 to 100 m) on the northern São Paulo shelf during the austral summer and winter. A one-way analysis of similarity permutation test revealed there was no seasonal difference in the structure of the bivalve assemblages in the area. A clustering analysis indicated 3 groups of stations corresponding to the bathymetric gradient. Both K-dominance curves and Shannon and Pielou indexes showed higher biological diversity and higher evenness for the shallower area. Most of the bivalves found were classified as suspension-feeders, co-occurring with deposit-feeder species, suggesting an absence of negative interactions between these trophic groups. Differences in the frequency of disturbance along the depth gradient caused by wave storms - more common in winter - and also by predation and anthropogenic activities, such as dredging of fishing boats and input of gross sewage, likely explain the higher diversity found on the inner shelf of Ubatuba.

The impact of anthropogenic activities on nutrient dynamics in the tropical Wenchanghe and Wenjiaohe Estuary and Lagoon system in East Hainan, China

2011 ◽  
Vol 125 (1-4) ◽  
pp. 49-68 ◽  
Author(s):  
Su Mei Liu ◽  
Rui Huan Li ◽  
Gui Ling Zhang ◽  
Dao Ru Wang ◽  
Jin Zhou Du ◽  
...  
Keyword(s):  
Nutrient Dynamics ◽  
Anthropogenic Activities ◽  
Lagoon System ◽  
The Impact

scholarly journals Trends and Non-Stationarity in Groundwater Level Changes in Rapidly Developing Indian Cities

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3209
Author(s):  
Aadhityaa Mohanavelu ◽  
K. S. Kasiviswanathan ◽  
S. Mohanasundaram ◽  
Idhayachandhiran Ilampooranan ◽  
Jianxun He ◽  
...  
Keyword(s):  
Climate Variability ◽  
Groundwater Level ◽  
Anthropogenic Activities ◽  
Statistical Correlation ◽  
Change Dynamics ◽  
Green Cover ◽  
Developing Cities ◽  
Groundwater Systems ◽  
Indian Cities ◽  
Groundwater Level Changes

In most of the Indian cities, around half of the urban water requirement is fulfilled by groundwater. Recently, seasonal urban droughts have been frequently witnessed globally, which adds more stress to groundwater systems. Excessive pumping and increasing demands in several Indian cities impose a high risk of running out of groundwater storage, which could potentially affect millions of lives in the future. In this paper, groundwater level changes have been comprehensively assessed for seven densely populated and rapidly growing secondary cities across India. Several statistical analyses were performed to detect the trends and non-stationarity in the groundwater level (GWL). Also, the influence of rainfall and land use/land cover changes (LULC) on the GWL was explored. The results suggest that overall, the groundwater level was found to vary between ±10 cm/year in the majority of the wells. Further, the non-stationarity analysis revealed a high impact of rainfall and LULC due to climate variability and anthropogenic activities respectively on the GWL change dynamics. Statistical correlation analysis showed evidence supporting that climate variability could potentially be a major component affecting the rainfall and groundwater recharge relationship. Additionally, from the LULC analysis, a decrease in the green cover area (R = 0.93) was found to have a higher correlation with decreasing groundwater level than that of urban area growth across seven rapidly developing cities.

Sign in / Sign up

Export Citation Format

Share Document