![]() ![]() Knapp PA (1996) Cheatgrass ( Bromus tectorum L.) dominance in the Great Basin Desert: history, persistence, and influences to human activities. Kennedy PL, DeBano SJ, Bartuszevige A, Lueders A (2009) Effects of native and nonnative grassland plant communities on breeding passerine birds: implications for restoration of Northwest bunchgrass prairie. Kappes H, Lay R, Topp W (2007) Changes in different trophic levels of litter-dwelling macrofaunal associated with giant knotweed invasion. Jiménez-Valverde A, Lobo JM (2007) Determinants of local spider ( Araneidae and Thomisidae) species richness on a regional scale: climate and altitude vs habitat structure. Hall LK (2012) Effect of cheatgrass on abundance of the North American deermouse ( Peromyscus maniculatus). Rangel Ecol Manag 71:292–297ĭeVore JL, Maerz JC (2014) Grass invasion increases top-down pressure on an amphibian via structurally mediated effects on an intraguild predator. (2001)011%5b1261:SBIAUG%5d2.0.CO 2ĭavies KW, Boyd CS (2018) Longer-term evaluation of revegetation of medusahead-invaded sagebrush steppe. īelnap J, Phillips SL (2001) Soil biota in an ungrazed grassland: response to annual grass ( Bromus tectorum) invasion. R Package Version 0.999999-0īell JR, Wheater CP, Cullen WR (2001) The implications of grassland and heathland management for the conservation of spider communities: a review. īates, DM, Maechler M, Bolker B (2012) lme4: Linear Mixed-Effects Models Using S4 classes. Increased litter may provide these spiders with more prey, refugia, and foraging habitat or modulate extreme temperature and moisture conditions in this arid grassland.īagchi S, Briske DD, Bestelmeyer BT, Ben WuX (2013) Assessing resilience and state-transition models with historical records of cheatgrass Bromus tectorum invasion in North American sagebrush-steppe. A positive relationship between invasive annual grass and litter cover suggests that cheatgrass and medusahead contribute significantly to litter, which may result in the higher observed Xysticus abundance. Results revealed that abundance of ground crab spiders was positively associated with increased cover of invasive annual grasses and litter. Spiders were sampled using pitfall traps and cover of invasive annual grasses and litter was surveyed for three years (2014–2016). Crab spiders are ambush predators, and Xysticus is a ground-dwelling genus that forages primarily in litter. This study examined the response of an important grassland predator, ground crab spiders (Thomisidae: Xysticus), to annual grass invasion in semi-arid grasslands of eastern Oregon. However, little is known about how annual grass invasions affect invertebrates, including spiders, which provide significant ecosystem services. Annual grasses, such as cheatgrass ( Bromus tectorum L.) and medusahead ( Taeniatherum caput- medusae), are significant invaders of grasslands in the western United States and their presence has been found to influence vegetation and vertebrate wildlife. ![]() Effectively managing invaded grasslands requires a comprehensive understanding of effects of the invader on key species in those ecosystems. ![]()
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