tailieunhanh - Lake Trout Ecosystems in a Changing Environment - Chapter 17 (end)

Phương bắc vùng biển khiên: mô hình và quản lý những thách thức cuốn sách này được thiết kế để giải quyết hai câu hỏi quan trọng liên quan đến vùng biển của Lá chắn phương bắc: * (1) Chúng ta có thể quản lý hiệu quả tương tác của con người với khiên phương bắc vùng biển và sinh vật thủy sản, tại các địa phương toàn cầu quy mô không gian, bây giờ và trong tương lai? và (2) Bài học từ nước khiên phương bắc và lưu vực sông có thể phục vụ các mô hình hữu ích cho các khu vực. | section V Synthesis 2004 by CRC Press LLC chapter seventeen Boreal Shield waters models and management challenges Robert J. Steedman Ontario Ministry of Natural Resources John M. Gunn Ontario Ministry of Natural Resources Laurentian University Richard A. Ryder RAR and Associates Contents Glacial legacies A recent example of colonization Modern threats The challenge of integrative ecosystem indicators The challenge of ecosystem sustainability Acknowledgments References This book was designed to address two important questions related to the waters of the Boreal Shield 1 Can we effectively manage human interactions with Boreal Shield waters and aquatic biota at local-to-global spatial scales now and in the future and 2 Can lessons from Boreal Shield waters and watersheds serve as useful models for other regions and ecosystems Although human behavior has had great influence on Boreal Shield waters we have limited ability to constructively affect these exquisitely complex and dynamic systems. Our influences often harmful have generally been through gross structural changes involving harvest or exploitation of ecological products and services such as fish trees hydraulic energy and waste disposal. Our development practices also cause the insidious continued devastation of the shoreline ecotone which serves as a center of attraction and We used the Boreal Shield ecozone the largest of the 15 ecozones in Canada as the geographic focus of this book. Boreal or northern forest refers to the mainly coniferous forest that covers most of the northern portion of the ecozone. Shield refers to the exposed Precambrian Shield bedrock that extends across the entire ecozone Ecological Stratification Working Group 1995 . 2004 by CRC Press LLC production for many species of plants and wildlife. A sustainable relationship between humans and Boreal Shield waters therefore requires that we control and improve our environmental interactions and adopt a more cautious and protective role .