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| Angeler, David G; Swedish University of Agricultural Sciences, Department of Aquatic Sciences and Assessment; david.angeler@slu.se; Drakare, Stina; Swedish University of Agricultural Sciences, Department of Aquatic Sciences and Assessment ; stina.drakare@slu.se; Johnson, Richard K; Swedish University of Agricultural Sciences, Department of Aquatic Sciences and Assessment ; richard.johnson@slu.se. |
| Revealing the adaptive responses of ecological, social, and economic systems to a transforming biosphere is crucial for understanding system resilience and preventing collapse. However, testing the theory that underpins complex adaptive system organization (e.g., panarchy theory) is challenging. We used multivariate time series modeling to identify scale-specific system organization and, by extension, apparent resilience mechanisms. We used a 20-year time series of invertebrates and phytoplankton from 26 Swedish lakes to test the proposition that a few key-structuring environmental variables at specific scales create discontinuities in community dynamics. Cross-scale structure was manifested in two independent species groups within both communities across... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Complex adaptive systems dynamics; Complex adaptive systems organization; Cross-scale structure; Discontinuities; Environmental variables; Invertebrates; Lakes; Panarchy; Phytoplankton; Resilience; Time series modeling. |
| Ano: 2011 |
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| Angeler, David G; Swedish University of Agricultural Sciences, Department of Aquatic Sciences and Assessment; david.angeler@slu.se; Allen, Craig R; U.S. Geological Survey, Nebraska Cooperative Fish and Wildlife Research Unit; School of Natural Resources, University of Nebraska, Lincoln; allencr@unl.edu; Johnson, Richard K; Swedish University of Agricultural Sciences, Department of Aquatic Sciences and Assessment; richard.johnson@slu.se. |
| 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... |
| Tipo: Peer-Reviewed Insight |
Palavras-chave: Algal blooms; Alternative states; Biological invasions; Boreal lakes; Complex adaptive systems; Discontinuities; Landscape ecology; Panarchy; Resilience. |
| Ano: 2012 |
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| Gomez, O; Briais, Anne; Sauter, D; Mendel, V. |
| We present the analysis of the deformation in the axial valley of two contrasted regions of the very slow spreading Southwest Indian Ridge based on side-scan sonar images. Our objective is to investigate how the obliquity is accommodated along the system. We show that the robust magmatic segments have axial valleys and major faults subperpendicular to spreading. The other sections show fault populations with various degrees of obliquity, often arranged in left-stepping echelons, accommodating part of the strike-slip deformation. Side-scan sonar reveals the presence of a corrugated surface near 59 degrees E interpreted to be an incipient detachment fault. We show that the large width of the SWIR oblique sections, and the difference in tectonic style between... |
| Tipo: Text |
Palavras-chave: Mid-ocean ridges; Side-scan sonar; Tectonics; Discontinuities. |
| Ano: 2006 |
URL: https://archimer.ifremer.fr/doc/00234/34567/33236.pdf |
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| Floodgate, G.d.; Lochte, K.; Egan, B.. |
| The data obtained in surveys to investigate the bacteriological aspects of the biology of two contrasting frontal systems has shown that the Inherent homeostasis and the complexity of the environment, together with the Imprecision of the data, lead to biomass values that are difficult to interpret in terms of the physical factors governing the formation of fronts. Although biochemical measurements offer some promise of providing more reliable and less confusing information, the oeed to develop high precision methods that can be made very frequently is emphasised. |
| Tipo: Text |
Palavras-chave: Bacteria; Discontinuities; Fronts; Methodology. |
| Ano: 1982 |
URL: http://archimer.ifremer.fr/doc/00306/41742/40953.pdf |
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