By Michael Chinery
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Additional resources for Collins Gem Butterflies: An Easy-to-Use Guide to Europe's Most Common Species
1989b). The situation was made more complex because a number of species actually showed increasing populations during the period 1966–1978, followed by declines (Fig. 3); these species often had similar levels of abundance in 1966 and 1988. Thus, some populations declined only during a small portion of the BBS sampling period, and others showed declines that brought them back to their initial levels of abundance. Yet, all these were being noted as declining species in 1989. As a result, some scientists have raised valid 20 Saving Migrant Birds Population trends of the Purple Martin.
4. Fragmentation Studies 43 many cases, these were species associated with the edge of the forest or other disturbed habitats. Most important, a number of species occurred only on large or relatively large fragments. Despite the presence of seeminglyadequate habitat that might be large enough to support dozens of territories, these species onlyoccurred when fragment size had exceeded some required minimum area. Not surprisingly, scientists rather rapidly tried to determine what these minimum critical areas were and quickly labeled these species as ‘‘area-sensitive’’ (although one could also argue that those species found only on small fragments were also area-sensitive, but in a less worrisome way).
The forested area in this region was reduced to about 25% of the original area and fragmented into more than 1,000 separate units. They have a point, because loss of a majority of the habitat is probably more important than what we do with the remaining pieces, but the reality is that we did not under- A B Forest fragmentation in central Missouri. This ﬁve-county area was fairly heterogeneous before European settlement (A) with forest shown as dark, prairie as light, but most prairie and forest areas were connected.