The waterfall paradox: How knickpoints disconnect hillslope and channel processes, isolating salmonid populations in ideal habitats

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• 作者：Christine May^a ; ^{maycl@jmu.edu} ; Josh Roering^b ; ^{jroering@uoregon.edu} ; Kyle Snow^a ; Kitty Griswold^c ; ^{griskitt@isu.edu} ; Robert Gresswell^d ; ^{bgresswell@usgs.gov}
• 关键词：Knickpoints ; Salmonid habitat ; Disturbance ecology ; Shallow landslides
• 刊名：Geomorphology
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：277
• 期：Complete
• 页码：228-236
• 全文大小：1942 K
• 卷排序：277

文摘

Waterfalls are barriers to fish migration, yet isolated populations have persisted despite being disconnected. Above waterfalls we found wider valleys, gentler channel and hillslope gradients, and reduced shallow landslide potential. Habitat models indicated that salmonid habitat is present in greater quantity and quality above waterfalls. Paradoxically, waterfalls isolate fish in ideal habitat by providing relatively constant baselevel for channel development.