Arid
DOI10.1890/ES14-00319.1
Responses of a desert nematode community to changes in water availability
Vandegehuchte, Martijn L.1,2,3; Sylvain, Zachary A.1,2,4; Reichmann, Lara G.5; De Tomasel, Cecilia Milano1,2; Nielsen, Uffe N.1,2,6,7; Wall, Diana H.1,2; Sala, Osvaldo E.8,9,10
通讯作者Vandegehuchte, Martijn L.
来源期刊ECOSPHERE
ISSN2150-8925
出版年2015
卷号6期号:3
英文摘要

The most recent climate models unequivocally predict a strong drying trend for the southwestern USA within the next century. Soil nematodes are a highly important component of desert ecosystem functioning, but rely on water films formovement. However, it is currently poorly understood how different trophic groups of nematodes respond to chronic presses as well as short-lived pulses of altered water availability, especially in arid systems where such changes are expected to have the greatest impact. The aim of this study was to assess the effects of both instantaneous and long-term variation in water availability on desert soil nematode trophic groups. We hypothesized that nematode abundance would respond positively to both short-and long-term increases in moisture. Based on the ecology of the different trophic groups we further made predictions about their relative rates of response. We increased or decreased precipitation from ambient levels in the Chihuahuan Desert for four consecutive years and sampled soil nematodes after two, three and four years. We tested the effects of altered precipitation treatments through time as well as gravimetric soil moisture at the time of sampling on the abundance of the different nematode trophic groups. In contrast to our hypotheses, the abundances of most nematode trophic groups were unaffected by the amount of precipitation, even after four years of altered precipitation. Plant-parasitic nematodes from low moisture soils were the only group that reacted positively to increased precipitation from the third year onwards. Trophic groups responded differently to soil moisture, with bacterivores decreasing with increasing moisture and omnivores showing a positive relationship that diminished over time. We show that in general, these desert nematodes were not limited by precipitation, and were highly resilient to decreases therein. However, when also considering the effects of soil moisture, some more complex patterns and differences among trophic groups emerged. We discuss potential mechanisms explaining these observations and contrast our findings with those from other ecosystems around the world. We conclude that deserts harbor nematode communities that seem more resilient to altered water availability than other ecosystems.


英文关键词drought precipitation resilience soil ecology soil moisture trophic groups
类型Article
语种英语
国家USA ; Switzerland ; Canada ; Australia
收录类别SCI-E
WOS记录号WOS:000352205900017
WOS关键词GRASSLAND ECOSYSTEMS ; POPULATION-DYNAMICS ; SIMULATED RAINFALL ; FEEDING NEMATODES ; NORTH-AMERICA ; SOIL BIOTA ; MOISTURE ; TEMPERATURE ; NITROGEN ; MODEL
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
来源机构Arizona State University ; New Mexico State University ; Colorado State University
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/186859
作者单位1.Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA;
2.Colorado State Univ, Nat Resource Ecol Lab, Ft Collins, CO 80523 USA;
3.Swiss Fed Inst Forest Snow & Landscape Res WSL, Res Unit Community Ecol, CH-8903 Birmensdorf, Switzerland;
4.Atlantic Forestry Ctr, Canadian Forest Serv, Nat Resources Canada, Fredericton, NB E3B 5P7, Canada;
5.USDA ARS, Grassland Soil & Water Res Lab, Temple, TX 76502 USA;
6.Univ Western Sydney, Hawkesbury Inst Environm, Penrith, NSW 2751, Australia;
7.Univ Western Sydney, Sch Sci & Hlth, Penrith, NSW 2751, Australia;
8.Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA;
9.Arizona State Univ, Sch Sustainabil, Tempe, AZ 85287 USA;
10.New Mexico State Univ, Jornada Basin Long Term Ecol Res Program, Las Cruces, NM 88003 USA
推荐引用方式
GB/T 7714
Vandegehuchte, Martijn L.,Sylvain, Zachary A.,Reichmann, Lara G.,et al. Responses of a desert nematode community to changes in water availability[J]. Arizona State University, New Mexico State University, Colorado State University,2015,6(3).
APA Vandegehuchte, Martijn L..,Sylvain, Zachary A..,Reichmann, Lara G..,De Tomasel, Cecilia Milano.,Nielsen, Uffe N..,...&Sala, Osvaldo E..(2015).Responses of a desert nematode community to changes in water availability.ECOSPHERE,6(3).
MLA Vandegehuchte, Martijn L.,et al."Responses of a desert nematode community to changes in water availability".ECOSPHERE 6.3(2015).
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