scholarly journals Is the patch size distribution of vegetation a suitable indicator of desertification processes? Comment

Ecology ◽  
2010 ◽  
Vol 91 (12) ◽  
pp. 3739-3742 ◽  
Author(s):  
S. Kéfi ◽  
C. L. Alados ◽  
R. C. G. Chaves ◽  
Y. Pueyo ◽  
M. Rietkerk
Keyword(s):  
Size Distribution ◽  
Patch Size

scholarly journals ASYMMETRIC PATCH SIZE DISTRIBUTION LEADS TO DISRUPTIVE SELECTION ON DISPERSAL

Evolution ◽  
2010 ◽  
Vol 65 (2) ◽  
pp. 490-500 ◽  
Author(s):  
François Massol ◽  
Anne Duputié ◽  
Patrice David ◽  
Philippe Jarne
Keyword(s):  
Size Distribution ◽  
Patch Size ◽  
Disruptive Selection

scholarly journals The Influence of Land Surface Heterogeneities on Cloud Size Development

2014 ◽  
Vol 142 (10) ◽  
pp. 3830-3846 ◽  
Author(s):  
Malte Rieck ◽  
Cathy Hohenegger ◽  
Chiel C. van Heerwaarden
Keyword(s):  
Size Distribution ◽  
Power Law ◽  
Land Surface ◽  
Patch Size ◽  
Deep Convection ◽  
Maximum Size ◽  
Heterogeneous Surfaces ◽  
Homogeneous Surface ◽  
Boundary Layer Height ◽  
Scale Break

Abstract This study analyzes the effects of land surface heterogeneities at various horizontal scales on the transition from shallow to deep convection and on the cloud size distribution. An idealized case of midlatitude summertime convection is simulated by means of large-eddy simulations coupled to an interactive land surface. The transition is accelerated over heterogeneous surfaces. The simulation with an intermediate patch size of 12.8 km exhibits the fastest transition with a transition time two-thirds that over a homogeneous surface. A similar timing is observed for the precipitation onset whereas the total accumulated rainfall tends to increase with patch size. The cloud size distribution can be approximated by a power law with a scale break. The exponent of the power law is independent of the heterogeneity scale, implying a similar cloud cover between the simulations. In contrast, the scale break varies with patch size. The size of the largest clouds does not scale with the boundary layer height, although their maximum size scales with the patch size. Finally, the idea that larger clouds grow faster, known from homogeneous surface conditions, is not fully valid over heterogeneous surfaces. These various aspects can be understood from the complex interplay between the characteristics of the triggered mesoscale circulations and a cloud development acting in response to the diurnal cycle in surface heating. The results also call for adequate representation of such effects in convective parameterizations.

scholarly journals Patch size distribution and network connectivity affect species invasion dynamics in dendritic networks

2020 ◽  
Author(s):  
Kathrin Holenstein ◽  
Eric Harvey ◽  
Florian Altermatt
Keyword(s):  
Biological Invasions ◽  
Size Distribution ◽  
Patch Size ◽  
Local Community ◽  
Local Communities ◽  
Invasion Success ◽  
Establishment Success ◽  
Invasion Dynamics ◽  
Dendritic Networks ◽  
Invading Species

AbstractBiological invasions are globally affecting ecosystems, causing local species loss and altering ecosystem functioning. Understanding the success and unfolding of such biological invasions is thus of high priority. Both local properties and the spatial network structure have been shown to be determinants of invasion success, and the identification of spatial invasion hubs directly promoting invasion dynamics is gaining attention. Spatial dynamics, however, could also indirectly alter invasion success by shaping local community structure: in many ecosystems, such as riverine networks, regional properties such as patch size distribution are known drivers of local community structures, which themselves may affect the establishment success of invading species. Using microcosm experiments in dendritic networks, we disentangled how patch size distribution and dispersal along specific network topologies shaped local communities, and, subsequently, affected the establishment success of invading species. We find that inherent patch size distributions shaped composition and diversity of local communities, and, subsequently, modulated invasion success. Specifically, the relationship between local diversity and invasion success changed across an increasing patch size gradient from a negative to a positive correlation, while overall increasing patch size reduced invasion success. Connectivity did not have a direct effect on invasion success but indirectly affected invasions by shaping diversity patterns in the whole network. Our results emphasize the relevance of indirect, landscape-level effects on species invasions, which need to be considered in the management of spatial habitat networks.

scholarly journals Changes in diatom patch-size distribution and degradation in a spatially self-organized intertidal mudflat ecosystem

Ecology ◽  
2012 ◽  
Vol 93 (3) ◽  
pp. 608-618 ◽  
Author(s):  
E. J. Weerman ◽  
J. Van Belzen ◽  
M. Rietkerk ◽  
S. Temmerman ◽  
S. Kéfi ◽  
...  
Keyword(s):  
Size Distribution ◽  
Patch Size ◽  
Intertidal Mudflat ◽  
Self Organized

scholarly journals Implementation of natural disturbance-based management in northern British Columbia

2007 ◽  
Vol 83 (3) ◽  
pp. 338-346 ◽  
Author(s):  
S. Craig DeLong
Keyword(s):  
British Columbia ◽  
Key Words ◽  
Size Distribution ◽  
Patch Size ◽  
Natural Disturbance ◽  
Timber Supply ◽  
Stage Distribution ◽  
Natural Range ◽  
Landscape Units ◽  
Northeast Corner

Ecologically based landscape units and associated characteristics of natural disturbance (e.g., seral stage and patch size distribution) were recently developed for the northeast corner of British Columbia and used as the basis for establishing guidance and policy for natural disturbance-based management for two large timber supply areas. I discuss the development of the landscape units; development of guidance for the units; and implementation of the guidance for old forest, interior old forest, and early seral patch size objectives. This paper demonstrates how natural-disturbance-based management can be successfully implemented. Key words: natural-disturbance-based management, natural range of variability, seral stage distribution, old-forest requirements, patch size, guidance, implementation

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