scholarly journals Waterbody scale assessment using spatial models to identify suitable locations for cage aquaculture in large lake systems: A case study in Volta Lake, Ghana

2021 ◽  
Author(s):  
Ruby Asmah ◽  
Lynne Falconer ◽  
Trevor C. Telfer ◽  
Anthony Y. Karikari ◽  
Mohamed Al Wahaibi ◽  
...  
Keyword(s):  
Spatial Models ◽  
Large Lake ◽  
Volta Lake ◽  
Scale Assessment ◽  
Cage Aquaculture ◽  
Lake Systems

scholarly journals Predicting Shifts in Land Suitability for Maize Cultivation Worldwide Due to Climate Change: A Modeling Approach

Land ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 295
Author(s):  
Yuan Gao ◽  
Anyu Zhang ◽  
Yaojie Yue ◽  
Jing’ai Wang ◽  
Peng Su
Keyword(s):  
Climate Change ◽  
Crop Production ◽  
Large Scale ◽  
Land Suitability ◽  
Large Scale Assessment ◽  
Scale Assessment ◽  
Maize Cultivation ◽  
Large Scale Screening ◽  
Selection Of

Suitable land is an important prerequisite for crop cultivation and, given the prospect of climate change, it is essential to assess such suitability to minimize crop production risks and to ensure food security. Although a variety of methods to assess the suitability are available, a comprehensive, objective, and large-scale screening of environmental variables that influence the results—and therefore their accuracy—of these methods has rarely been explored. An approach to the selection of such variables is proposed and the criteria established for large-scale assessment of land, based on big data, for its suitability to maize (Zea mays L.) cultivation as a case study. The predicted suitability matched the past distribution of maize with an overall accuracy of 79% and a Kappa coefficient of 0.72. The land suitability for maize is likely to decrease markedly at low latitudes and even at mid latitudes. The total area suitable for maize globally and in most major maize-producing countries will decrease, the decrease being particularly steep in those regions optimally suited for maize at present. Compared with earlier research, the method proposed in the present paper is simple yet objective, comprehensive, and reliable for large-scale assessment. The findings of the study highlight the necessity of adopting relevant strategies to cope with the adverse impacts of climate change.

scholarly journals Reconciling the water balance of large lake systems

2020 ◽  
Vol 137 ◽  
pp. 103505 ◽  
Author(s):  
Andrew D. Gronewold ◽  
Joeseph P. Smith ◽  
Laura K. Read ◽  
James L. Crooks
Keyword(s):  
Water Balance ◽  
Large Lake ◽  
Lake Systems

The impact of spatial heterogeneity on selection: a case study on Pinus pinaster breeding seedling orchards

2008 ◽  
Vol 38 (1) ◽  
pp. 114-124 ◽  
Author(s):  
Rafael Zas
Keyword(s):  
Spatial Autocorrelation ◽  
Spatial Patterns ◽  
Genetic Gain ◽  
Pinus Pinaster ◽  
Spatial Models ◽  
Selection Methods ◽  
Family Selection ◽  
The Impact

Although failure to account for spatial autocorrelation has been dramatic in some forest progeny trials, little attention has been paid to how this issue may affect selections within the trials. The effects of spatial autocorrelation of height growth on the estimation of genetic gain and on the spatial distribution of the selected trees were studied in four Pinus pinaster Ait. progeny trials that were rogued using different selection methods and intensities. When selections are based on unadjusted original values, selected trees tend to be located in the best microsites and are unlikely to be the most genetically superior. This resulted in a loss of genetic gain that varied between 10% and 20% and sometimes exceeded 30%. Differences in the loss of gain among different selection methods and intensities were minor and followed no clear pattern. Selecting on the basis of a conventional model resulted in spatial patterns of the retained trees that were clearly aggregated in all cases. However, selections based on spatially adjusted data resulted in random spatial patterns, except with family selection because of the use of multiple-tree plots. Because clumping of the retained trees may seriously affect the quantity and quality of the seed crop, breeders are strongly encouraged to use appropriate spatial models for roguing breeding seedling orchards.

Enhancing local fish production through cage aquaculture on the Volta Lake: Impacts on capture fisheries

2019 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
Miriam Ameworwor ◽  
Ruby Asmah ◽  
Patrick Danson ◽  
Michelle Clottey
Keyword(s):  
Fish Production ◽  
Volta Lake ◽  
Cage Aquaculture

scholarly journals Environmental and socioeconomic impact of cage aquaculture at Kpeve Tornu section of the Volta Lake, Ghana

2018 ◽  
Vol 8 (2) ◽  
pp. 84-95
Author(s):  
VIDZRO FRANCIS MENSAH ◽  
TED YEMOH ANNANG ◽  
BENJAMIN D. OFORI
Keyword(s):  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
Fish Farming ◽  
Socioeconomic Impact ◽  
Production Cycle ◽  
Fish Farms ◽  
Gross Margin ◽  
Volta Lake ◽  
Aquaculture Industry ◽  
Cage Aquaculture

Mensah VF, Yemoh T, Ofori BD. 2018. Environmental and socioeconomic impact of cage aquaculture at Kpeve Tornu section of the Volta Lake. Bonorowo Wetlands 2: 84-95. Sufficient data on the financial viability of cage aquaculture in Ghana is limited, and only little is also known of the effects of fish farming on the Volta Lake on fishing communities. This study, therefore, sought to investigate these relevant issues at Kpeve Tornu, a fishing society in Afadjato South District in the Volta Region. Laboratory analysis of physicochemical parameters suggested that there were no significant differences between water quality parameters from four fish farms and two control locations. A cost-benefit analysis performed on five cages of volume 360 cubic meters each was 1.34 in the first production cycle, whereas a gross margin of 104.41 percent in the second production cycle suggesting that cage aquaculture industry in Ghana was financially viable. The cage aquaculture industry also impacted positively on the livelihoods of the people of Kpeve Tornu in regions of recruitment, poverty alleviation, trade, and food security. Cage fish farm owners did not comply fully with aquaculture rules. Aquaculture rules were effective on fingerlings and aquaculture related chemicals producers, but the rules on fish farmers needed a review because there were no definitions for intensive and semi-intensive fish farming in the aquaculture rules of Ghana.

Sign in / Sign up

Export Citation Format

Share Document