Evaluating Impacts of Imazapic Treatments on Mule Deer Forage Quality, Quantity, and Composition

IF 2.4 3区 环境科学与生态学 Q2 ECOLOGY
Trenton D. Gianella, Dana M. Sanchez
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引用次数: 0

Abstract

The invasion of exotic annual grasses including cheatgrass (Bromus tectorum), medusahead (Taeniatherum caput-medusae), and North Africa grass (Ventenata dubia) have drastically altered grassland ecosystems across the western United States. Continuous efforts have been made to reclaim these ecosystems through the application of annual grass selective herbicides. The effectiveness of these herbicides and the response of vegetation post application is well documented, but research is lacking in how these treatments directly affect mule deer (Odocoileus hemionus) forage quality, quantity, and composition throughout the year. Our objectives were to evaluate the efficacy of using imazapic (Open Range G, Wilbur-Ellis) to improve summer mule deer forage and assess the potential negative effects of the herbicide on winter forage availability. In fall of 2020, imazapic was applied to fifteen, 8-ha plots established within telemetered mule deer home ranges located in grassland habitat surrounding Heppner, Oregon, United States. Paired treatment and control plots were monitored for 2 yr in the summer and fall of 2021 and summer of 2022. Our results suggest that imazapic applications can be used to increase the nutritional quality of forage but may temporarily reduce the quantity of forage available in the first summer after treatment. In the second summer, forage biomass increased significantly but crude protein and digestible energy contents of forage were no longer superior within treatment plots. Imazapic applications had no effect on winter forage biomass or nutritional quality of forage available. Imazapic treatments appear to be an effective strategy to improve summer mule deer forage quality and quantity without adversely affecting winter food sources.

评估咪草烟处理对骡鹿饲料质量、数量和组成的影响
外来一年生草(包括欺骗草(Bromus tectorum)、medusahead(Taeniatherum caput-medusae)和北非草(Ventenata dubia))的入侵极大地改变了美国西部的草原生态系统。人们一直在努力通过施用一年生草类选择性除草剂来恢复这些生态系统。这些除草剂的效果和施药后植被的反应都有详细的记录,但这些处理方法如何直接影响骡鹿(Odocoileus hemionus)全年的饲料质量、数量和组成却缺乏研究。我们的目标是评估使用咪草烟(Open Range G,Wilbur-Ellis)改善骡鹿夏季饲料的效果,并评估除草剂对冬季饲料可用性的潜在负面影响。2020 年秋季,在位于美国俄勒冈州赫普纳周围草原栖息地的遥测骡鹿家园范围内建立的 15 块 8 公顷的地块上施用了咪草烟。在 2021 年夏秋季和 2022 年夏季,对成对的处理地块和对照地块进行了为期 2 年的监测。我们的研究结果表明,施用咪草烟可以提高牧草的营养质量,但在处理后的第一个夏季,可能会暂时减少可利用的牧草数量。在第二个夏季,牧草生物量显著增加,但处理地块内牧草的粗蛋白和可消化能量含量不再具有优势。施用咪草烟对冬季牧草生物量或可用牧草的营养质量没有影响。咪草烟处理似乎是提高夏季骡鹿饲料质量和数量的有效策略,而不会对冬季食物来源产生不利影响。
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来源期刊
Rangeland Ecology & Management
Rangeland Ecology & Management 农林科学-环境科学
CiteScore
4.60
自引率
13.00%
发文量
87
审稿时长
12-24 weeks
期刊介绍: Rangeland Ecology & Management publishes all topics-including ecology, management, socioeconomic and policy-pertaining to global rangelands. The journal''s mission is to inform academics, ecosystem managers and policy makers of science-based information to promote sound rangeland stewardship. Author submissions are published in five manuscript categories: original research papers, high-profile forum topics, concept syntheses, as well as research and technical notes. Rangelands represent approximately 50% of the Earth''s land area and provision multiple ecosystem services for large human populations. This expansive and diverse land area functions as coupled human-ecological systems. Knowledge of both social and biophysical system components and their interactions represent the foundation for informed rangeland stewardship. Rangeland Ecology & Management uniquely integrates information from multiple system components to address current and pending challenges confronting global rangelands.
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