ABSTRACT
The current industrial and economic activities in Sindh Province, Pakistan, polluted the region's water, air, soil, and marine resources. However, there is a rising demand for eco-friendly production, and it is important to develop new policies and tools to combat environmental degradation and enhance economic development. Cleaner Production (CP) provides opportunities to address many of these issues. Employed method for this study was based on three approaches: a literature review and stakeholder mapping; a collection of data and information from key stakeholders through focal group discussions, consultative workshops, and one-on-one meetings; and analysis and synthesis of data that were gathered from different sources. The analysis of collected information provides an overview of CP strategies moving forward. Participant workshops gave in-depth information on policy implementation, technological impediments to methods that have been employed elsewhere, and needed capacity building as well as financial consequences of policy implementation. Through increasing financial resources and institutional resources, the expansion of CP will help to replace the conventional methods of waste treatment with an eco-efficiency approach to preventing pollution at the source, thus reducing the need for expensive pollution control and management costs for environmental compliance. Experiences, achievements, and implementation pitfalls from this study can provide a lesson to other developing countries to improve their economic and environmental sustainability.
ABSTRACT
Habitat fragmentation of freshwater ecosystems is increasing rapidly, however the understanding of extinction debt and species decline in riverine habitat fragments lags behind that in other ecosystems. The mighty rivers that drain the Himalaya - the Ganges, Brahmaputra, Indus, Mekong and Yangtze - are amongst the world's most biodiverse freshwater ecosystems. Many hundreds of dams have been constructed, are under construction, or are planned on these rivers and large hydrological changes and losses of biodiversity have occurred and are expected to continue. This study examines the causes of range decline of the Indus dolphin, which inhabits one of the world's most modified rivers, to demonstrate how we may expect other vertebrate populations to respond as planned dams and water developments come into operation. The historical range of the Indus dolphin has been fragmented into 17 river sections by diversion dams; dolphin sighting and interview surveys show that river dolphins have been extirpated from ten river sections, they persist in 6, and are of unknown status in one section. Seven potential factors influencing the temporal and spatial pattern of decline were considered in three regression model sets. Low dry-season river discharge, due to water abstraction at irrigation barrages, was the principal factor that explained the dolphin's range decline, influencing 1) the spatial pattern of persistence, 2) the temporal pattern of subpopulation extirpation, and 3) the speed of extirpation after habitat fragmentation. Dolphins were more likely to persist in the core of the former range because water diversions are concentrated near the range periphery. Habitat fragmentation and degradation of the habitat were inextricably intertwined and in combination caused the catastrophic decline of the Indus dolphin.
Subject(s)
Dolphins , Ecosystem , Extinction, Biological , Fresh Water , Homing Behavior , Animals , Spatio-Temporal AnalysisABSTRACT
Levels of total organic carbon (TOC) and black carbon (BC) were determined together with those of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in the selected eighteen coastal sites (n = 285) along the Arabian Sea from Pakistan. Results showed that the total concentration of TOC, BC, ∑OCPs and ∑26PCBs ranged between 0.3 and 2.9% dw, 0.1-0.2% dw, 0.9-110 ng g(-1) dw and 6.2-1200 ng g(-1) dw, respectively. Correlation analysis of BC (r = 0.26-0.89) and TOC (r = 0.06-0.69) revealed a stronger association with studied compounds. The sedimentary depositional fluxes (D) for ∑OCPs and ∑26PCBs were calculated as 1.7 and 4.9 tons yr(-1), respectively. In the coastal belt of Pakistan, sedimentary mass inventories (I) indicated the presence of 13 and 37 metric tons of ∑OCPs and ∑26PCBs, respectively.
