Insight on invasions and resilience derived from spatiotemporal discontinuities of biomass at local and regional scales

Ecology and Society
By: , and 



Understanding the social and ecological consequences of species invasions is complicated by nonlinearities in processes, and differences in process and structure as scale is changed. Here we use discontinuity analyses to investigate nonlinear patterns in the distribution of biomass of an invasive nuisance species that could indicate scale-specific organization. We analyze biomass patterns in the flagellate Gonyostomum semen (Raphidophyta) in 75 boreal lakes during an 11-year period (1997-2007). With simulations using a unimodal null model and cluster analysis, we identified regional groupings of lakes based on their biomass patterns. We evaluated the variability of membership of individual lakes in regional biomass groups. Temporal trends in local and regional discontinuity patterns were analyzed using regressions and correlations with environmental variables that characterize nutrient conditions, acidity status, temperature variability, and water clarity. Regionally, there was a significant increase in the number of biomass groups over time, indicative of an increased number of scales at which algal biomass organizes across lakes. This increased complexity correlated with the invasion history of G. semen and broad-scale environmental change (recovery from acidification). Locally, no consistent patterns of lake membership to regional biomass groups were observed, and correlations with environmental variables were lake specific. The increased complexity of regional biomass patterns suggests that processes that act within or between scales reinforce the presence of G. semen and its potential to develop high-biomass blooms in boreal lakes. Emergent regional patterns combined with locally stochastic dynamics suggest a bleak future for managing G. semen, and more generally why invasive species can be ecologically successful.

Publication type Article
Publication Subtype Journal Article
Title Insight on invasions and resilience derived from spatiotemporal discontinuities of biomass at local and regional scales
Series title Ecology and Society
DOI 10.5751/ES-04928-170232
Volume 17
Issue 2
Year Published 2012
Language English
Publisher The Resilience Alliance
Contributing office(s) Nebraska Cooperative Fish and Wildlife Research Unit
Description 15 p.; Article 32
Online Only (Y/N) N
Additional Online Files (Y/N) N
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