This paper summarises discussions by invited speakers during a special session at the 6th North A... more This paper summarises discussions by invited speakers during a special session at the 6th North American Duck Symposium on wetland issues that affect waterfowl, highlighting current ecosystem challenges and opportunities for the conservation of waterfowl in North America. Climate change, invasive species, U.S. agricultural policy (which can encourage wetland drainage and the expansion of row-crop agriculture into grasslands), cost and competition for water rights, and wetland management for non-waterfowl species were all considered to pose significant threats to waterfowl populations in the near future. Waterfowl populations were found to be faced with significant threats in several regions, including: the Central Valley of California, the
To understand possible factors impacting distribution of wintering waterfowl, we analyzed satelli... more To understand possible factors impacting distribution of wintering waterfowl, we analyzed satellite imagery to estimate area of winter- flooded (flooded and saturated soil) and winter-dry harvested rice in Butte, Colusa, American, Sutter, Yolo, and Delta basins in the northern Central Valley of California. We compared our results for the 1999-00 winter with estimates that Spell et al. (1995) reported using
The International Boreal Conservation Science Panel is an interdisciplinary team of scientists fr... more The International Boreal Conservation Science Panel is an interdisciplinary team of scientists from the U.S. and Canada. Its members have a wide range of expertise and experience gained from years of research, conservation, and writing about science issues related to North America and many other parts of the world. The panel is jointly concerned with the future of North America’s boreal forest and in ensuring that the scientific issues related to the conservation of the boreal forest are clearly articulated to the public and decision-makers in government and industry. The panel enlists its member specialists and invited expert associates in producing science/policy briefing notes for issues of major relevance to the future of the boreal forest.
ABSTRACT To understand possible factors impacting distribution of wintering waterfowl, we analyze... more ABSTRACT To understand possible factors impacting distribution of wintering waterfowl, we analyzed satellite imagery to estimate area of winter- flooded (flooded and saturated soil) and winter-dry harvested rice in Butte, Colusa, American, Sutter, Yolo, and Delta basins in the northern Central Valley of California. We compared our results for the 1999-00 winter with estimates that Spell et al. (1995) reported using identical methods for 1988-89 and 1993-94. Area of winter-flooded rice in the northern Central Valley in 1999-00 (78,841 ha) was 37% greater than in 1993-94 (57,702 ha) and 46% greater than in 1988-89 (53,816 ha). Winter-flooded rice increased an average of 3,253 ha per year between 1993-94 and 1999-00 compared to 777 ha per year between 1988-89 and 1993-94. The increase in flooded rice area was due to both an increase in total rice area (201,512 ha in 1999- 00 vs. 171,918 ha in 1993-94 and 163,586 ha in 1988-89) and an increase in percentage of rice area that was flooded (39% in 1999-00 vs. 34% in 1993- 94 and 33% in 1988-89). Change in winter-flooded rice area varied among basins. These results will help understand changes in distribution of wintering waterfowl among Central Valley basins during 1988-2000. The challenge for wildlife managers is to develop strategies that incorporate impacts of the increase in rice area in the northern Central Valley while recognizing that various factors could reduce rice area in the future.
This paper summarises discussions by invited speakers during a special session at the 6th North A... more This paper summarises discussions by invited speakers during a special session at the 6th North American Duck Symposium on wetland issues that affect waterfowl, highlighting current ecosystem challenges and opportunities for the conservation of waterfowl in North America. Climate change, invasive species, U.S. agricultural policy (which can encourage wetland drainage and the expansion of row-crop agriculture into grasslands), cost and competition for water rights, and wetland management for non-waterfowl species were all considered to pose significant threats to waterfowl populations in the near future. Waterfowl populations were found to be faced with significant threats in several regions, including: the Central Valley of California, the
To understand possible factors impacting distribution of wintering waterfowl, we analyzed satelli... more To understand possible factors impacting distribution of wintering waterfowl, we analyzed satellite imagery to estimate area of winter- flooded (flooded and saturated soil) and winter-dry harvested rice in Butte, Colusa, American, Sutter, Yolo, and Delta basins in the northern Central Valley of California. We compared our results for the 1999-00 winter with estimates that Spell et al. (1995) reported using
The International Boreal Conservation Science Panel is an interdisciplinary team of scientists fr... more The International Boreal Conservation Science Panel is an interdisciplinary team of scientists from the U.S. and Canada. Its members have a wide range of expertise and experience gained from years of research, conservation, and writing about science issues related to North America and many other parts of the world. The panel is jointly concerned with the future of North America’s boreal forest and in ensuring that the scientific issues related to the conservation of the boreal forest are clearly articulated to the public and decision-makers in government and industry. The panel enlists its member specialists and invited expert associates in producing science/policy briefing notes for issues of major relevance to the future of the boreal forest.
ABSTRACT To understand possible factors impacting distribution of wintering waterfowl, we analyze... more ABSTRACT To understand possible factors impacting distribution of wintering waterfowl, we analyzed satellite imagery to estimate area of winter- flooded (flooded and saturated soil) and winter-dry harvested rice in Butte, Colusa, American, Sutter, Yolo, and Delta basins in the northern Central Valley of California. We compared our results for the 1999-00 winter with estimates that Spell et al. (1995) reported using identical methods for 1988-89 and 1993-94. Area of winter-flooded rice in the northern Central Valley in 1999-00 (78,841 ha) was 37% greater than in 1993-94 (57,702 ha) and 46% greater than in 1988-89 (53,816 ha). Winter-flooded rice increased an average of 3,253 ha per year between 1993-94 and 1999-00 compared to 777 ha per year between 1988-89 and 1993-94. The increase in flooded rice area was due to both an increase in total rice area (201,512 ha in 1999- 00 vs. 171,918 ha in 1993-94 and 163,586 ha in 1988-89) and an increase in percentage of rice area that was flooded (39% in 1999-00 vs. 34% in 1993- 94 and 33% in 1988-89). Change in winter-flooded rice area varied among basins. These results will help understand changes in distribution of wintering waterfowl among Central Valley basins during 1988-2000. The challenge for wildlife managers is to develop strategies that incorporate impacts of the increase in rice area in the northern Central Valley while recognizing that various factors could reduce rice area in the future.
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