scholarly journals Do hydro-biological factors influence spawning migration: A case study of Hilsa’s (Tenualosa ilisha) breeding habitat in Ganga River, India

2021 ◽  
Vol 25 (3) ◽  
pp. 187-199
Author(s):  
Subhendu K. Chatterjee et al.
2019 ◽  
Vol 3 (1) ◽  
pp. 1-8
Author(s):  
Vanessa R. Levesque ◽  
Aram J. K. Calhoun ◽  
Elizabeth Hertz

Conservation of natural resources is challenging given the competing economic and ecological goals humans have for landscapes. Vernal pools in the northeastern US are seasonal, small wetlands that provide critical breeding habitat for amphibians and invertebrates adapted to temporary waters, and are exceptionally hard to conserve as their function is dependent on connections to other wetlands and upland forests. A team of researchers in Maine joined forces with a diverse array of governmental and private stakeholders to develop an alternative to existing top-down vernal pool regulation. Through creative adoption and revision of various resource management tools, they produced a vernal pool conservation mechanism, the Maine Vernal Pool Special Management Area Plan that meets the needs of diverse stakeholders from developers to ecologists. This voluntary mitigation tool uses fees from impacts to vernal pools in locally identified growth areas to fund conservation of “poolscapes” (pools plus appropriate adjacent habitat) in areas locally designated for rural use. In this case study, we identify six key features of this mechanism that illustrate the use of existing tools to balance growth and pool conservation. This case study will provide readers with key concepts that can be applied to any conservation problem: namely, how to work with diverse interests toward a common goal, how to evaluate and use existing policy tools in new ways, and how to approach solutions to sticky problems through a willingness to accept uncertainty and risk.


2020 ◽  
Vol 12 (14) ◽  
pp. 5738
Author(s):  
Mohammad Mojibul Hoque Mozumder ◽  
Aili Pyhälä ◽  
Md. Abdul Wahab ◽  
Simo Sarkki ◽  
Petra Schneider ◽  
...  

This paper considers the hilsa shad (Tenualosa ilisha) fishery of southern Bangladesh as a case study regarding governance and power dynamics at play in a small-scale fishery, and the relevance of these for the sustainable management of coastal fisheries. Qualitative methods, involving in-depth individual interviews (n = 128) and focus group discussions (n = 8) with key stakeholders in the hilsa fishery, were used to capture multiple perspectives on governance from those in different positions in the relative power structures studied, while facilitating insightful discussions and reflections. The analysis here is based on a power cube framework along three power dimensions (levels, spaces, and forms) in Bangladesh’s hilsa fishery. The study displays an imbalance in the present hilsa governance structure, with some stakeholders exercising more power than others, sidelining small-scale fishers, and encouraging increasing illegal fishing levels that ultimately harm both the fisheries and those dependent on them. To overcome this, we propose a co-management system that can play a vital role in equalizing power asymmetry among hilsa fishery stakeholders and ensure effective hilsa fishery governance. Our results suggest that recognizing analyzed power dynamics has substantial implications for the planning and implementation of such co-management and the long-term sustainability of the hilsa fishery.


2020 ◽  
Vol 18 (13) ◽  
Author(s):  
Wan Nor Fareeda W. Yahya ◽  
Nazri Che Dom

An understanding of dengue vector ecology plays an integral role in the effective elimination of vector breeding sites. The aim of this study was to assess the profile of the breeding habitat of the Aedes mosquito in urban high-rise buildings in Malacca. This study utilized epidemiological data from 2013 to 2017 to determine the distribution of dengue cases and Aedes breeding sites in high rise buildings. The Analytical Hierarchy Process (AHP) was used to evaluate the characteristics of Aedes breeding in high-rise buildings. In addition, the age and the total number of floors in the high-rise buildings were found to be important determinants of DF. The findings from this study will aid in the identification of target areas, which in turn can support future community-based search-and destroy intervention efforts. Furthermore, the conclusions of this research may guide the future design and construction features of high-rise buildings in Malaysia, which in turn can contribute toward a holistic and sustainable environment in the country.


2019 ◽  
Vol 12 (02) ◽  
pp. 1950023 ◽  
Author(s):  
Debaldev Jana ◽  
Sachinandan Dutta ◽  
G. P. Samanta

New offspring due to sexual reproduction is not an instantaneous process from its birth, it takes time to be sexually mature. On the other hand, harvesting of commercially profitable fish population before the perfect size or weight is reached is not only a commercial loss but also risks the extinction of the population. Now, we discuss the issue of Ganges-Brahmaputra-Meghna basin, northern Bay of Bengal for the age-selective harvesting of Hilsa shad (Tenualosa ilisha) which lays eggs after its sexual maturation. Harvesting of hilsa before its sexual maturation risks its extinction and due to lamer body weight, it is not a commercially profitable policy. This is a reality of Sundarban estuary for hilsa fish harvesting, therefore, biologically and economically both India and Bangladesh are facing several problems. Empirical data of Frasergunje Fishing Harbor shows a clear picture as the supporting document of this mathematical problem.


2015 ◽  
Vol 30 (5) ◽  
pp. 805-816 ◽  
Author(s):  
Jerry van Dijk ◽  
Roland E. van der Vliet ◽  
Harm de Jong ◽  
Maarten J. Zeylmans van Emmichoven ◽  
Henk A. van Hardeveld ◽  
...  

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