2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/23/2019 | 12:00 PM - 12:15 PM | IMPACTS OF RIVER MODIFICATIONS ON FOOD WEBS – LESSONS FROM COLLECTIONS IN AUSTRALIA AND THE AMERICAN SOUTHWEST | 250 DE
IMPACTS OF RIVER MODIFICATIONS ON FOOD WEBS – LESSONS FROM COLLECTIONS IN AUSTRALIA AND THE AMERICAN SOUTHWEST
River flow homogenization caused by dam and weir construction has been correlated with reduction of community niche breadth, as predicted by food web theory. Stable isotope analysis of natural history collections has been invaluable in gaining these insights. Pre-alteration conditions can be established with sufficient collections, allowing for post-alteration comparisons. However, some portion of food web shifts that have been correlated with dam/weir construction may be confounded by other anthropogenic disturbances, particularly effluent from agriculture and human settlements. Advances in stable isotope techniques may make it possible for ecologists to trace baseline shifts in primary production values that would express itself throughout the food web. Here, using collections, we examine food webs from two analog aridland river systems which were heavily modified in the 20th century: the Murray-Darling (Southeast Australia) and the Rio Grande (Southwest U.S.).
- Dams
- Fish
- Nitrogen
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Presenters/Authors
Gregor Hamilton
(), University of New Mexico, ghamilton@unm.edu;
ASHA DISCLOSURE:
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Thomas Turner
(), University of New Mexico, turnert@unm.edu;
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Nonfinancial -