ESP 190 Tuolumne River KMZ (Gove, 2010)

Tuolumne River

Author: Kelley Gove

Cottonwood Recruitment Box Conceptual Model in the Lower Tuolumne River

This Google Earth file is an attempt to visualize one of the concepts from the article, “Ecology and Management of the Spring Snowmelt Recession” (Yarnell et al., BioScience. Feb. 2010, v. 60, n. 2), in relation to the Tuolumne River. The article presents a conceptual model for the spring snowmelt recession, focusing on the Mediterranean-montane system. I focus on the cottonwood (Populus ssp.), a species native to streams throughout the Western US. Since this project has developed from a class that focused on the Tuolumne River, I am applying some of the ideas from the paper to this river. The Mediterranean-montane system is characterized by a large springtime pulse of water and a recession, which have a major impact on biotic conditions. The pulse and recession create both physical changes, such as scour, and timing cues for seed dispersal. The moment when seed dispersal and wet gravel bars overlap is key for cottonwoods and can be seen in the recruitment box, a period of three to four weeks occurring in late spring. Regulation and climate change may affect the river, which could reduce or eliminate the recruitment box for cottonwoods.

TuolumneRiverRecruitmentBox_Gove_2010_ESP190.kmz323.14 KB