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The Effects of Livestock Grazing and Climate Variation on Vegetation and Grasshopper Communities in the Northern Chihuahuan Desert

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The Effects of Livestock Grazing and Climate Variation on Vegetation and Grasshopper Communities in the Northern Chihuahuan Desert Research Article D.C. LIGHTFOOTJournal of Orthoptera Research 2018, 27(1): 35-5135 The effects of livestock grazing and climate variation on vegetation and grasshopper communities in the northern Chihuahuan Desert DAVID C. LIGHTFOOT1 1 Museum of Southwestern Biology, Biology Department, University of New Mexico, Albuquerque, NM, USA, 87131. Corresponding author: David C. Lightfoot ([email protected]) Academic editor: Tim Gardiner | Received 1 August 2017 | Accepted 9 November 2017 | Published 12 June 2018 http://zoobank.org/C95315B9-EF67-4505-AD53-76A849F6E645 Citation: Lightfoot DC (2018) The effects of livestock grazing and climate variation on vegetation and grasshopper communities in the northern Chihuahuan Desert. Journal of Orthoptera Research 27(1): 35–51. https://doi.org/10.3897/jor.27.19945 Abstract by species adaptations to local soils and vegetation composition and structure (e.g. Anderson 1964, Mulkern 1967, 1982, Otte Grasshoppers are important herbivores of North American semi-arid and Joern 1977, Joern 1979, 1982, Kang et al. 1989, Fielding and grasslands and shrublands, and vegetation and climate are key factors con- Brusven 1995a, Torrusio et al. 2002, Cigliano et al. 2010, Savitsky trolling their species compositions and population dynamics. Domestic 2010). Population densities of many grasshopper species fluctuate livestock grazing is a historic and a current landscape-scale ecological per- widely over time, apparently largely due to bottom-up changes in turbation that has caused reductions of perennial grasses and increases in food plant availability and quality, caused not only by variation woody shrubs and weedy annual herbs in desert grassland communities. Climate variation also affects vegetation and grasshopper production, and in precipitation, but also by physiological responses to variation the combined effects of livestock grazing and climate variation on vegeta- in temperature and moisture conditions (Rodell 1977, Capinera tion and grasshoppers have not been adequately studied in the American 1987, Fielding and Brusven 1990, Joern and Gaines 1990, Belov- Southwest. I measured vegetation and grasshoppers for five years at a series sky and Joern 1995). Density-dependent effects of other grass- of five semi-arid sites in the northern Chihuahuan Desert to evaluate the hoppers, predators, parasitoids, and disease also interact to affect interactive effects of short-term livestock grazing and climate variation on grasshopper populations (Dempster 1963, Street and McGuire plant and grasshopper community structure and species abundances. The 1990). How grasshopper communities and populations respond study sites ranged from shrub dominated to grass dominated landscapes, to environmental disturbance such as domestic livestock grazing with livestock fence lines separating land that was grazed at 30% annual and climate change depends to what extent soil, vegetation and forage utilization, and lands on the other sides of the fences excluded from weather conditions change in magnitude, space and time, and to grazing for at least 20 years. I assigned grasshopper species to life-form guilds based on their ecomorphologies and their microhabitat substrate what extent different grasshopper species with variable environ- uses that I observed. A wet spring/dry summer El Niño event occurred at mental tolerances are affected by the changes. Some species are the beginning of the study, and a dry spring/wet summer La Niña event oc- likely to respond in certain ways, while other species may show curred at the end of the study. Livestock grazing changed plant and grass- different responses (Fielding and Brusven 1996). hopper species compositions and abundances significantly during those Convergence or divergence in grasshopper species ecologies wet years, further favoring annual forbs, annual grasses and non-gramini- and specializations are likely driven by the evolution of ecological cole grasshoppers on grazed lands during wet years, while favoring peren- traits (e.g. Van der Plas et al. 2012). Grasshoppers that occur in nial grasses and graminicoles on non-grazed lands also during wet years. particular types of habitats and feed on particular types of plants The biotic communities at all sites probably supported more perennial have morphological, physiological and behavioral adaptations, grasses and more graminicoles prior to European settlement and livestock or ecological traits that maximize evolutionary fitness for those grazing that began over a century before this study. species in their particular environments. Grasshopper species that Key words share similar ecological traits for morphology, diet and behavior are ecological guilds; groups of species that exploit the same class Acrididae, desertification, ecological disturbance, guilds, life-forms of environmental resources in a similar way (Root 1967, Diamond 1975). How one choses to describe grasshopper community structure, including guilds, depends upon the purpose for such Introduction description (Lockwood 2011), and the guild concept is useful for understanding higher level ecological structure that may show pat- Grasshoppers are important primary consumers in semi-arid terns beyond taxonomically constrained species, tribes, subfamily regions throughout the world (Uvarov 1977), and grasshopper and family ranks. The grasshopper community guild concept has species compositions are determined largely by geographic prox- been used to describe grasshopper community structure for spe- imity to evolutionary source regions (Key 1959, Otte 1976) and cific assemblages and locations in North America (e.g. Joern and JOURNAL OF ORTHOPTERA RESEARCH 2018, 27(1) 36 D.C. LIGHTFOOT Lawlor 1981), China (Hong-Shi 1991, Sun et al. 2013) and Africa grasshopper species compositions and population densities in (Prendini et al. 1996). Those studies assigned grasshopper species savanna, shrub-steppe and desert grassland environments (e.g. from local assemblages to guilds based on microhabitat and food Capinera and Sechrist 1982, Jepsen-Innes and Bock 1989, Quinn resource use, which provided good descriptions of the ecological and Walgenbach 1990, Fielding and Brusven 1993, 1995b, 1996, structures of those grasshopper communities. Prendini et al. 1996, Gebeyehu and Samways 2003, Debano 2006, Uvarov (1977) described grasshopper life-forms that occur Kang and Chen 2008, Branson and Sword 2010). Results of studies globally, and that correspond to ecological/morphological traits vary, especially between grasslands/savanna and desert grasslands, of grasshoppers that live in particular types of microhabitats, such but grasshoppers that prefer more open microhabitats with spars- as open bare soil, grass, forbs and shrubs and trees. I previously er and lower stature vegetation tend to respond more favorably to applied Uvarov’s life-form concept to describe grasshopper guild livestock grazing than those that prefer taller and denser herba- structure in North American desert grasshopper communities ceous vegetation (e.g. Prendini et al. 1996). Livestock grazing also in the cool-temperate Great Basin Desert and in the warm sub- can reduce grasshopper diversity, and favor fewer ecological gener- tropical Chihuahuan Desert, based on substrate use by individual alist grasshopper species (e.g. Fielding and Brusven 1993) that can grasshoppers (Lightfoot 1985). I found that life-forms reflected shift the temporal stabilities of such communities, making them the ecological traits of grasshopper species: 1) terricoles live on more sensitive to changes in climate. bare soil or rock surfaces and feed on grasses and forbs, 2) herbi- Fielding and Brusven (1996) provided a literature review of coles live and feed on forbs, 3) graminicoles live on and feed on livestock grazing effects on semi-arid region grasshoppers of North grasses, and 4) arbusticoles live on and feed on woody shrubs (a America. They concluded that there is no one answer to the ques- subset of arboricoles). The life-form guild structure was similar tion of how livestock grazing effects grasshoppers; each situation in both deserts, while the species were not. Grasshopper species is different, and each depends upon current and historic grazing within life-form guilds should exhibit similar responses to chang- regimes, local environments, grasshopper species ecologies, and es in vegetation resources, relative to other responses of species in ecological, temporal, spatial and functional characteristics of the other guilds. Grasshopper life-form guilds have also proved useful system studied. Of particular importance is the differentiation of for documenting the effects of burrowing rodents (Cynomys spp.) short-term (< 10 years) vs. long-term (decades to centuries) effects and livestock grazing on plant and grasshopper communities in of grazing on soils, vegetation and grasshoppers. Long-term graz- the northern Chihuahuan Desert (Davidson and Lightfoot 2008, ing can permanently change soils, vegetation and grasshoppers, Davidson et al. 2010). Just as grasshopper species with different while the impacts of short-term grazing may revert back to origi- ecologies can serve as species indicators of environmental change nal conditions within a few years if grazing ceases (Fielding and in local geographic regions (Bazelet and Samways 2011), grasshop- Brusven 1996). per life-form guilds transcend regional taxonomic constraints of Variation in weather or long-term climate is known to be a key species (Uvarov 1977), and have the potential to serve globally
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