Interactions between freshwater ecosystem services and land cover changes in southern Bangladesh: A perspective from short-term (seasonal) and long-term (1973-2014) scale.

We aimed to assess the long-term (1973-2014) and short-term (pre- and post-monsoon) quantities, values and changes of freshwater ecosystem services (FES) in the wetland areas of Southern Bangladesh using land cover change as a proxy indicator. Bangladesh is a sub-tropical country that receives >80% of its annual rainfall during the monsoon and post-monsoon periods, between the months of June and November. Therefore, it could be hypothesized that the monsoon and post-monsoon rainfalls significantly contribute to altering the local land cover, and consequently change the FES. Our multi-stage methodology, among others, included; (i) participatory FES identification (ii) long-term and seasonal land cover analysis using Remote Sensing and GIS, and (iii) assessing FES quantities and values using an expert-developed FES Matrix. The results identified 14 major FES; seven provisioning, six regulating and one cultural service. The results showed that over the last 40 years, significant land cover transformations occurred in the study area e.g. increase of agricultural land, rural vegetation with settlement (RVS) in exchange of wetlands, along with significant seasonal variations include increase of wetland in the post-monsoon seasons and agricultural land in the pre-monsoon seasons. Such changes contributed to the decrease of total long-term FES quantities and economic values including a significant reduction of regulating and provisioning services. Post-monsoon seasons experienced increased quantities of regulating services (e.g. soil fertility, water purification and biodiversity), mainly as a result of additional rainfall, although its overall quantities considerably decreased over the long-term. The results of the study highlighted the importance of prudent land management policies at rural scales for better ecosystem services and conservation.

A transdisciplinary account of water research.

Water research is introduced from the combined perspectives of natural and social science and cases of citizen and stakeholder coproduction of knowledge. Using the overarching notion of transdisciplinarity, we examine how interdisciplinary and participatory water research has taken place and could be developed further. It becomes apparent that water knowledge is produced widely within society, across certified disciplinary experts and noncertified expert stakeholders and citizens. However, understanding and management interventions may remain partial, or even conflicting, as much research across and between traditional disciplines has failed to integrate disciplinary paradigms due to philosophical, methodological, and communication barriers. We argue for more agonistic relationships that challenge both certified and noncertified knowledge productively. These should include examination of how water research itself embeds and is embedded in social context and performs political work. While case studies of the cultural and political economy of water knowledge exist, we need more empirical evidence on how exactly culture, politics, and economics have shaped this knowledge and how and at what junctures this could have turned out differently. We may thus channel the coproductionist critique productively to bring perspectives, alternative knowledges, and implications into water politics where they were not previously considered; in an attempt to counter potential lock-in to particular water policies and technologies that may be inequitable, unsustainable, or unacceptable. While engaging explicitly with politics, transdisciplinary water research should remain attentive to closing down moments in the research process, such as framings, path-dependencies, vested interests, researchers' positionalities, power, and scale. WIREs Water 2016, 3:369-389. doi: 10.1002/wat2.1132 For further resources related to this article, please visit the WIREs website.