Get Monitoring Ecological Impacts: Concepts and Practice in PDF
By Barbara J. Downes, Leon A. Barmuta, Peter G. Fairweather, Daniel P. Faith, Michael J. Keough, P. S. Lake, Bruce D. Mapstone, Gerry P. Quinn
Tracking Ecological affects presents the instruments had to layout evaluation courses that could reliably display screen, become aware of, and make allowance administration of human affects at the normal atmosphere. The systems defined are well-grounded in inferential good judgment, and the statistical versions had to examine advanced info are given. step by step instructions and move diagrams offer transparent and useable protocols that are utilized in any sector of the realm, a variety of human affects, and any environment. furthermore, actual examples are used to teach how the idea could be positioned into perform.
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Extra resources for Monitoring Ecological Impacts: Concepts and Practice in Flowing Waters
1998). One example is the devastating effects on local native ﬁsh populations of the introduction of Nile perch into Lake Victoria (Achieng 1990). Another example is the unplanned arrival of the zebra mussel, Dreissena polymorpha, into the American Great Lakes and Hudson River and its subsequent effects on phytoplankton, zooplankton and benthos (Strayer et al. 1999). The effects of introduced biota may not be as severe as the above examples; indeed the effects may be indirectly mediated. Introduced trout in New Zealand streams suppress the foraging activities of grazing insects and this indirectly augments algal growth (Flecker & Townsend 1994).
In stream ecology a form of scaling-down comes in the application of hydrological equations for large-scale aggregates to small-scale patches. The mismatch can be instructive; for an example see the study of Downes et al. (1997), in which it was shown that commonly used hydraulic equations 25 26 The ecological nature of ﬂowing waters for predicting stream substrate movement with high water events that operate at the reach scale provided very poor predictions of actual substrate movements at small scales.
4). That philosophy of assessment does have some fundamental similarities to the philosophical approach highlighted in this book. Some observational evidence for disturbance is obtained, and this evidence then is judged ‘impressive’ only if it is improbable that it arose as a chance observation under normal conditions. The methods advocated in this book pin down those important notions of ‘improbability’, ‘chance’ and ‘normal’ through aspects of design that critically include replication (to get a handle on improbability) and controls (to get a handle on what is ‘normal’).