NDLI: Determining the timing of willow shrub dieback using epicormic shoots

Content Provider	Springer Nature Link
Author	Kaczynski, Kristen M. Cooper, David J.
Copyright Year	2014
Abstract	Riparian willows are declining throughout the Rocky Mountains, USA. Dendrochronological methods can be used to age dieback and disturbance dates in trees, however, these methods are not suitable for multi-stemmed shrub species. We present a new method for aging willow dieback using epicormic shoots and compare our findings with an aerial photo analysis of our riparian valley study site in Rocky Mountain National Park. Epicormic shoots initiate when stem wounding affects the apical meristem. We determined the date of stem death by comparing the age of the dead stem above a wound with the age of the live stem below a wound. Epicormic shoots initiated below wounds an average of 2 years prior to stem death, suggesting that it takes stems 2 years to die after being wounded. Aerial photo analysis demonstrated a sharp decline in willow canopy cover across the valley and we show a coinciding increase in epicormic shoots during the period of willow canopy decline. This was followed by a decrease in the number of epicormic shoots formed per year as the number of tall stems able to produce epicormic shoots has decreased. Age analysis of epicormic shoots is a promising new method for examining local scale willow dieback and decline.
Starting Page	319
Ending Page	323
Page Count	5
File Format	PDF
ISSN	09234861
Journal	Wetlands Ecology and Management
Volume Number	23
Issue Number	2
e-ISSN	15729834
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-08-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Stem aging Stem growth Epicormic shoot Salix spp. Willow Freshwater & Marine Ecology Evolutionary Biology Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Ecology, Evolution, Behavior and Systematics Management, Monitoring, Policy and Law

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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