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Title: Local and latitudinal variation in abundance: the mechanisms shaping the distribution of an ecosystem engineer

Journal Article · · PeerJ
DOI:https://doi.org/10.7717/peerj.100· OSTI ID:1904618
 [1];  [1];  [2];  [3]
  1. University of British Columbia, Vancouver, BC (Canada)
  2. Washington University, St. Louis, MO (United States)
  3. University of Tennessee, Knoxville, TN (United States)

Ecological processes that determine the abundance of species within ecological communities vary across space and time. These scale-dependent processes are especially important when they affect key members of a community, such as ecosystem engineers that create shelter and food resources for other species. Yet, few studies have examined the suite of processes that shape the abundance of ecosystem engineers. Here, we evaluated the relative influence of temporal variation, local processes, and latitude on the abundance of an engineering insect—a rosette-galling midge, Rhopalomyia solidaginis (Diptera: Cecidomyiidae). Over a period of 3–5 years, we studied the density and size of galls across a suite of local experiments that manipulated genetic variation, soil nutrient availability, and the removal of other insects from the host plant, Solidago altissima (tall goldenrod). We also surveyed gall density within a single growing season across a 2,300 km latitudinal transect of goldenrod populations in the eastern United States. At the local scale, we found that host-plant genotypic variation was the best predictor of rosette gall density and size within a single year. We found that the removal of other insect herbivores resulted in an increase in gall density and size. The amendment of soil nutrients for four years had no effect on gall density, but galls were smaller in carbon-added plots compared to control and nitrogen additions. Finally, we observed that gall density varied several fold across years. At the biogeographic scale, we observed that the density of rosette gallers peaked at mid-latitudes. Using meta-analytic approaches, we found that the effect size of time, followed by host-plant genetic variation and latitude were the best predictors of gall density. Taken together, our study provides a unique comparison of multiple factors across different spatial and temporal scales that govern engineering insect herbivore density.

Research Organization:
North Carolina State University, Raleigh, NC (United States); Univ. of Tennessee, Knoxville, TN (United States); Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Miller Institute for Basic Research; University of Tennessee; Natural Sciences and Engineering Research Council of Canada (NSERC); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
FG02-08ER64510; NNX09AK22G
OSTI ID:
1904618
Journal Information:
PeerJ, Vol. 1; ISSN 2167-8359
Publisher:
PeerJ Inc.Copyright Statement
Country of Publication:
United States
Language:
English

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The effects of insects, nutrients, and plant invasion on community structure and function above‐ and belowground journal February 2014