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Titlebook: Conservation Management of Freshwater Habitats; Lakes, rivers and we P. S. Maitland,N. C. Morgan Book 1997 Chapman & Hall 1997 Wildlife.con

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樓主: misperceive
21#
發(fā)表于 2025-3-25 03:45:12 | 只看該作者
Functions, Procedures and Packages,users want the same thing: reliable supplies of clean water. Rivers — and their entire catchments — therefore need to be actively managed in such a way as to balance the needs of the various users and to ensure that both the quantity and quality of the resource are maintained. For example, an import
22#
發(fā)表于 2025-3-25 09:43:20 | 只看該作者
23#
發(fā)表于 2025-3-25 13:03:05 | 只看該作者
Entities, Architectures, and Processes,Standing waters exhibit great variety, ranging from small shallow temporary pools through ponds and lakes to enormous waters that may be over 20 000 km. in area and 500 m in depth (Figures 1.3, 1.5, 7.1–7.6).
24#
發(fā)表于 2025-3-25 18:11:21 | 只看該作者
Decision Theory and Real Decisions:The general conclusion from recent species conservation reviews is that protection given to most native aquatic species and their habitats in the majority of countries is inadequate in terms both of the establishment of appropriate reserves and of legislation.
25#
發(fā)表于 2025-3-25 21:10:41 | 只看該作者
26#
發(fā)表于 2025-3-26 00:44:35 | 只看該作者
Species conservation,The general conclusion from recent species conservation reviews is that protection given to most native aquatic species and their habitats in the majority of countries is inadequate in terms both of the establishment of appropriate reserves and of legislation.
27#
發(fā)表于 2025-3-26 08:16:22 | 只看該作者
28#
發(fā)表于 2025-3-26 12:04:39 | 只看該作者
Paul Withington II,Larry W. Fullerton become more and more important to humans. Further, extended leisure time in modern societies has increased pressure on recreational facilities for aquatic activities like angling, wildfowling, sailing, swimming, water skiing and power-boating.
29#
發(fā)表于 2025-3-26 14:59:14 | 只看該作者
30#
發(fā)表于 2025-3-26 20:34:04 | 只看該作者
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