In recent decades science has rediscovered what ‘primitive’ peoples dating events Sakhipur understood: namely, that all living organisms profoundly interacts with one another and with their non-living surroundings. The modern study of this system of myrida interactions is called ecology.
Many scientific efforts have been made to link the decline of wild marine and terrestrial populations with human activities such as habitat fragmentation, overexploitation and global warming. Establishing the link between the loss of biodiversity and human-related threats is crucial to develop policies aimed at mitigating such threats», says Camilo Mora at Dalhousie University, leading author of the paper. Unfortunately, in many cases several threats are operating simultaneously making it difficult to isolate their individual and combined effects through field observations,»Mora adds. This new study used an experimental approach that has been broadly used in ecology to shed light into complex ecological processes. In this approach, populations of rotifers were maintained at equilibrium under laboratory conditions and then exposed to the simulated effect of exploitation, habitat loss and warming. Changes in population size were then quantified and compared to the changes occurred among populations that were not impacted. Our experiment clearly shows that exploitation, habitat loss ad warming are equally capable of causing significant population declines,» Mora says.
More importantly, our results showed that the stress induced by any one threat impairs the ability of populations to resist or adapt to other threats. Populations exposed to more than one threat declined drastically. Population declines were up to 50 times faster when all threats operate at their maximum extent upon a given population. It is hard to think of a system that would not be exposed to several threats at once,» says Nancy Knowlton, from the Scripps Institute of Oceanography.
Coral reefs, as an example, are being overexploited to satisfy food demands and the trade of ornamental species. They are also harmed by blast fishing, coastal development and pollution, all of which directly or indirectly kill the corals and leave them vulnerable to erosion and loss of their complex matrix. If environmentalists are painting a grim picture for the future of the planet, there is good reason for it. With droughts, heat waves and hurricanes expected to become increasingly common and more severe if global warming is allowed to continue unchecked, it is time the world takes action. Groundwater and surface water needs to be looked at basin by basin in terms of how pollutants enter the system, and basic hydrogeologic principles to maintain water balance in natural systems need to be applied. Contamination is hard to address once it occurs,and pollution prevention is the only viable strategy for groundwater. A new study has revealed that oceans around the world are fast turning into acidic water bodies.