Arid
DOI10.1017/S1751731116001531
Carrying capacity in arid rangelands during droughts: the role of temporal and spatial thresholds
Accatino, F.1,2; Ward, D.3,4; Wiegand, K.1; De Michele, C.5
通讯作者Accatino, F.
来源期刊ANIMAL
ISSN1751-7311
EISSN1751-732X
出版年2017
卷号11期号:2页码:309-317
英文摘要

Assessing the carrying capacity is of primary importance in arid rangelands. This becomes even more important during droughts, when rangelands exhibit non-equilibrium dynamics, and the dynamics of livestock conditions and forage resource are decoupled. Carrying capacity is usually conceived as an equilibrium concept, that is, the consumer density that can co-exist in long-term equilibrium with the resource. As one of the first, here we address the concept of carrying capacity in systems, where there is no feedback between consumer and resource in a limited period of time. To this end, we developed an individual-based model describing the basic characteristics of a rangeland during a drought. The model represents a rangeland composed by a single water point and forage distributed all around, with livestock units moving from water to forage and vice versa, for eating and drinking. For each livestock unit we implemented an energy balance and we accounted for the gut-filling effect (i.e. only a limited amount of forage can be ingested per unit time). Our results showed that there is a temporal threshold above which livestock begin to experience energy deficit and burn fat reserves. We demonstrated that such a temporal threshold increases with the number of animals and decreases with the rangeland conditions (amount of forage). The temporal threshold corresponded to the time livestock take to consume all the forage within a certain distance from water, so that the livestock can return to water for drinking without spending more energy than they gain within a day. In this study, we highlight the importance of a time threshold in the assessment of carrying capacity in non-equilibrium conditions. Considering this time threshold could explain contrasting observations about the influence of livestock number on livestock conditions. In case of private rangelands, the herd size should be chosen so that the spatial threshold equals (or exceeds) the length of the drought.


英文关键词optimal herd size water point energy deficit drought foraging
类型Article
语种英语
国家Germany ; France ; South Africa ; USA ; Italy
收录类别SCI-E
WOS记录号WOS:000398134100015
WOS关键词POPULATION-DYNAMICS ; WATERING POINTS ; CATTLE ; HETEROGENEITY ; HERBIVORES ; NONEQUILIBRIUM ; LANDSCAPE ; RAINFALL ; PATTERNS ; SAVANNA
WOS类目Agriculture, Dairy & Animal Science ; Veterinary Sciences
WOS研究方向Agriculture ; Veterinary Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/197291
作者单位1.Univ Gottingen, Fac Forest Sci & Forest Ecol, Busgenweg 4, Gottingen, Germany;
2.Univ Paris Saclay, UMR SADAPT, INRA, AgroParisTech, F-75005 Paris, France;
3.Univ KwaZulu Natal, Sch Life Sci, ZA-3209 Scottsville, South Africa;
4.Kent State Univ, Biol Sci, Kent, OH 44242 USA;
5.Politecn Milan, Dept Civil & Environm Engn, Pzza L Da Vinci 32, I-20133 Milan, Italy
推荐引用方式
GB/T 7714
Accatino, F.,Ward, D.,Wiegand, K.,et al. Carrying capacity in arid rangelands during droughts: the role of temporal and spatial thresholds[J],2017,11(2):309-317.
APA Accatino, F.,Ward, D.,Wiegand, K.,&De Michele, C..(2017).Carrying capacity in arid rangelands during droughts: the role of temporal and spatial thresholds.ANIMAL,11(2),309-317.
MLA Accatino, F.,et al."Carrying capacity in arid rangelands during droughts: the role of temporal and spatial thresholds".ANIMAL 11.2(2017):309-317.
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