Pyric Herbivory With Multiple Livestock Species: Similarities in Selection Between Cattle and Goats

IF 2.4 3区 环境科学与生态学 Q2 ECOLOGY
Alexander G. Barnes , Laura E. Goodman , Barney Luttbeg , Bryan D. Murray , Samuel D. Fuhlendorf
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Abstract

Pyric herbivory, the interaction between fire and grazing, is an ecological process in rangeland ecosystems. While cattle selection of burned patches is documented, the effects of a second herbivore species, like goats, remain unclear. This study examined patch selection patterns of cattle and goats when provided with both burned or unburned areas with patches varying in time since fire (TSF) and burn season. We hypothesized that both livestock species would select for recently burned patches, with cattle selection being more season-dependent than goats. We also hypothesized that the proportion of time allocated to the most recently burned patches would not significantly differ between livestock species. We compared TSF across burn seasons and quantified patch selection using Ivlev’s electivity index. Our results showed that both livestock species selected for recently burned patches, with selection decreasing as TSF increased. For cattle, patch selection was influenced by TSF and burn season. Goat patch selection was also related to TSF, but showed more variability in response to burn season and TSF duration. In dormant season burns, both livestock species selected for the most recently burned patches, while selection following growing season burns peaked at 6–11 months TSF. The observed patterns suggest that including goats in cattle operations that use pyric herbivory will not alter overall preference for burned areas.
多家畜种的草食性:牛与山羊选择的相似性
草食是草地生态系统中火与放牧相互作用的一个生态过程。虽然有文献记载了牛对烧伤地区的选择,但另一种食草动物的影响,如山羊,仍不清楚。本研究考察了牛和山羊在火灾(TSF)和燃烧季节随时间变化的烧伤或未烧伤地区的斑块选择模式。我们假设这两种牲畜都会选择最近被烧毁的斑块,牛的选择比山羊更依赖于季节。我们还假设,分配给最近被烧毁的斑块的时间比例在牲畜种类之间没有显著差异。我们比较了不同烧伤季节的TSF,并使用Ivlev选择性指数量化了斑块选择。结果表明,两种家畜都选择了最近被烧毁的斑块,随着TSF的增加,选择逐渐减少。对牛来说,斑块选择受热场和烧伤季节的影响。山羊斑块选择也与TSF有关,但对烧伤季节和TSF持续时间的反应表现出更大的变异性。在休眠季节烧伤中,两种家畜都选择了最近烧伤的斑块,而在生长季节烧伤后的选择在6-11个月的TSF时达到顶峰。观察到的模式表明,将山羊纳入使用热草食的养牛场不会改变对烧伤地区的总体偏好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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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