Aquatic Ecosystems: Trends and Global Prospects by Nicholas V. C. Polunin

By Nicholas V. C. Polunin

Challenge approximately destiny provides of unpolluted water to society, to fulfill the entire diversity of human wishes, now comes very excessive at the precedence record of worldwide societal concerns. An overarching factor, which this publication addresses, is whether or not worldwide weather swap is a dominant motive force of switch within the constitution and serve as of all traditional water-based ecosystems, or even if direct human inhabitants progress and speeded up intake are taking part in an equivalent or higher position. This booklet divides the entire aquatic realm into 21 ecosystems, from these on land (both saline and clean water) to these of the open and deep oceans. It attracts at the realizing of prime ecologists to summarize the nation and certain via the 12 months 2025 of every of the ecosystems. Written for educational researchers and environmental pros, the purpose is to place the weather swap debate right into a broader context as a foundation for conservation technology and making plans.

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Extra resources for Aquatic Ecosystems: Trends and Global Prospects

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2006). Of 58 marine fish population extirpations, exploitation was the primary cause of decline in 40 cases, the remainder being attributable to habitat loss, although the effects of habitat loss and exploitation on abundance are not always readily separable (Dulvy et al. 2003). g. see Sadovy & Cheung 2003; Dulvy et al. 2003). The fisheries targeting these species will obviously go bankrupt in the process, although they may continue to last for a while if propped up by sufficient subsidies. HOW MANY ECOSYSTEMS?

29 Global homogenization of biota following the spread of exotic species is a growing threat, the final extent and impact of which is uncertain. Ecologists are trying to understand the unifying factors behind successful invasions and how to prevent establishment of invasives and control already established species. The emerging discipline of invasion ecology is likely to play an increasing role in the development of strategies to cope with non-indigenous species. Clearly, research into the functional role of biodiversity and on species interactions generally should inform the management of invasive species.

Although threats to running waters vary with the spatial scale considered, the magnitude of their effects can also vary along longitudinal river profiles. For example, the effects of global climate change might be most pronounced on small tributaries that are more prone to fluctuations in discharge and temperature; at the same time, the effects of drought and saline intrusion are likely to be most pronounced in lowland sections of rivers (Fig. 1). For stressors such as nutrient additions, it is more likely that effects will be concentrated in middle and lowland river segments where human settlement and agricultural development are more pronounced (Fig.

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