Long-term studies fill a special role in the understanding of
populations, because they are the only way of determining
rates of change and their variability (see Likens, 1988;
Kareiva, Kingsolver & Huey, 1993). On its own, documentation of changes in abundance does not reveal underlying
mechanisms, but temporal data can provide useful tests of
hypotheses, if there are clear predictions of expected changes.
Long-term studies fill a special role in the understanding ofpopulations, because they are the only way of determiningrates of change and their variability (see Likens, 1988;Kareiva, Kingsolver & Huey, 1993). On its own, documentation of changes in abundance does not reveal underlyingmechanisms, but temporal data can provide useful tests ofhypotheses, if there are clear predictions of expected changes.
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