Alien invasive species may cause as much havoc in water-dependent ecosystems, such as wetlands, lakes and rivers, as they do in terrestrial systems. In the aquatic medium they are more diffi cult to detect and eradicate or even to control and there needs to be special effort to avoid such invasions from both alien species and genotypes. This paper describes some of the pathways and impacts of alien and other invasive species in aquatic situations and suggests that the intentional introduction of any species to a new environment should be preceded by a rigorous risk assessment process.
The CBFM international conference held on 6th and 7th March 2007 in Dhaka, Bangladesh brought together policy makers, scientists and development practioners from all over the world to share experiences in co-mangement of complex wetland environments. This booklet includes abstracts of papers presented at the conference.
The wetlands of the Yellow River delta face a situation common in many developing countries where the quest for rapid economic growth brings development to the doorstep of natural ecosystems and threatens their health and survival. This brief examines the several issues relating to wetlands in the Dongying municipality. Can the wetlands in Dongying coexist with the modern development that is creeping towards them? Is there sufficient appreciation that these wetlands are worth caring for?
Lake Chilwa produces between zero and 24,000 metric tons of fish per year, making it one of the most productive but variable lakes in Africa. The size of the lake varies seasonally and among years, sometimes drying completely. Its surrounding wetland and floodplain provide habitat for a diversity of birds and economically valuable grasses and reeds. When the lake has water, there is considerable activity on its shores and temporary fishing villages spring up. People move in and out of the lake basin in concert with these seasonal and longer term changes.
This study is a subsection of CPWF-30 (Challenge Program on Water and Food) that centers on investigating the wetland, agriculture, and livelihoods interactions. Chibuto, the floodplain of Changane River in Mozambique is a representative downstream site for the Limpopo sub-catchment. It largely serves as an agro-ecosystem with agricultural, grazing, and fiber collection as the prominent set of ecosystem services. The present analysis is a three-tier framework conceptualized to develop a synoptic overview of spatial, social, and economic elements that governs the system dynamics.
During the period of May to July 2002, An Giang University, in conjunction with the Chau Phu, Thoai Son and Chau Doc District People's Committees, and Can Tho University conducted Participatory Rural Appraisals (PRAs) in four different Provinces. The research findings from this study are presented in this report. The purpose of this exercise was to better understand the livelihoods of people living in rural areas and depending mainly on inland capture fisheries.
This report provides an assessment of the livelihoods strategies of the poor people dependent on inland fisheries in Bangladesh, Cambodia, the Lao PDR and Vietnam. Drawing upon the results of a one year investigation under the Project entitled "Understanding Livelihoods Dependent on Inland Fisheries", policies and institutions for fisheries management and livelihoods assets of the stakeholders in inland fisheries in the four countries. The report also discusses the trends and changes in fisheries and wetland resources.
Information on fisheries resources in Bangladesh and S.E. Asia is fragmented and has not taken account of poor people and their livelihoods. Research has been supply-led, resulting in limited uptake and gains for the non-poor. Often decisions are based on national level priorities, overlooking the needs of local people, especially the poor, and thus posing a severe threat to local livelihood assets including fisheries.
Regular monitoring of wetlands is an essential element of management for 'wise use'. Indeed, the Ramsar convention requires routine monitoring in order to detect changes in the ecological character at listed sites. However, there are few examples of monitoring of tropical wetlands on a sustained basis in the world. In the present study, we quantified land use/land cover changes in the lone Ramsar site, the Kolleru Wildlife Sanctuary of Andhra Pradesh, India between 1977 and 2007 using remote sensing and GIS techniques.
This paper is based on a first phase of a study in the Muthurajawela-Negombo wetland complex and aims to assess the overall spatial linkages between ecological and socioeonomic aspects of the wetland system using a geospatial model; incorporating biophysical and socioeconomic parameters for analysing and modelling the changes in the coastal wetland-agriculture-aquaculture complex.