CLIMATE CAUSES LARGE-SCALE SPATIAL SYNCHRONY IN POPULATION FLUCTUATIONS OF A TEMPERATE HERBIVORE

Ecology ◽  
2005 ◽  
Vol 86 (6) ◽  
pp. 1472-1482 ◽  
Author(s):  
Vidar Grøtan ◽  
Bernt-Erik SÆther ◽  
Steinar Engen ◽  
Erling Johan Solberg ◽  
John D. C. Linnell ◽  
...  
Keyword(s):  
Large Scale ◽  
Population Fluctuations ◽  
Spatial Synchrony

scholarly journals Population fluctuations and spatial synchrony in an arboreal rodent

Oecologia ◽  
2019 ◽  
Vol 191 (4) ◽  
pp. 861-871 ◽  
Author(s):  
Vesa Selonen ◽  
Jaanus Remm ◽  
Ilpo K. Hanski ◽  
Heikki Henttonen ◽  
Otso Huitu ◽  
...  
Keyword(s):  
Large Scale ◽  
Extinction Risk ◽  
Winter Precipitation ◽  
Climatic Conditions ◽  
Small Scale ◽  
Population Fluctuations ◽  
Spatial Synchrony ◽  
Flying Squirrels ◽  
Study Sites ◽  
Over Time

Abstract Climatic conditions, trophic links between species and dispersal may induce spatial synchrony in population fluctuations. Spatial synchrony increases the extinction risk of populations and, thus, it is important to understand how synchrony-inducing mechanisms affect populations already threatened by habitat loss and climate change. For many species, it is unclear how population fluctuations vary over time and space, and what factors potentially drive this variation. In this study, we focus on factors determining population fluctuations and spatial synchrony in the Siberian flying squirrel, Pteromys volans, using long-term monitoring data from 16 Finnish populations located 2–400 km apart. We found an indication of synchronous population dynamics on a large scale in flying squirrels. However, the synchrony was not found to be clearly related to distance between study sites because the populations seemed to be strongly affected by small-scale local factors. The regularity of population fluctuations varied over time. The fluctuations were linked to changes in winter precipitation, which has previously been linked to the reproductive success of flying squirrels. Food abundance (tree mast) and predator abundance were not related to population fluctuations in this study. We conclude that spatial synchrony was not unequivocally related to distance in flying squirrels, as has been observed in earlier studies for more abundant rodent species. Our study also emphasises the role of climate in population fluctuations and the synchrony of the species.

scholarly journals Synchronous combined effects of fishing and climate within a demersal community

2012 ◽  
Vol 70 (2) ◽  
pp. 319-328 ◽  
Author(s):  
Antoni Quetglas ◽  
Francesc Ordines ◽  
Manuel Hidalgo ◽  
Sebastià Monserrat ◽  
Susana Ruiz ◽  
...  
Keyword(s):  
Climate Variability ◽  
Age Structure ◽  
Large Scale ◽  
Southern Oscillation ◽  
Climatic Variability ◽  
Early Period ◽  
Combined Effects ◽  
Population Fluctuations ◽  
Fishing Activity ◽  
The Mediterranean

Abstract Quetglas, A., Ordines, F., Hidalgo, M., Monserrat, S., Ruiz, S., Amores, Á., Moranta, J., and Massutí, E. 2013. Synchronous combined effects of fishing and climate within a demersal community. – ICES Journal of Marine Science, 70: 319–328. Accumulating evidence shows that fishing exploitation and environmental variables can synergistically affect the population dynamics of exploited populations. Here, we document an interaction between fishing impact and climate variability that triggered a synchronic response in the population fluctuations of six exploited species in the Mediterranean from 1965–2008. Throughout this period, the fishing activity experienced a sharp increase in fishing effort, which caused all stocks to shift from an early period of underexploitation to a later period of overexploitation. This change altered the population resilience of the stocks and brought about an increase in the sensitivity of its dynamics to climate variability. Landings increased exponentially when underexploited but displayed an oscillatory behaviour once overexploited. Climatic indices, related to the Mediterranean mesoscale hydrography and large-scale north Atlantic climatic variability, seemed to affect the species with broader age structure and longer lifespan, while the global-scale El Niño Southern Oscillation index (ENSO) positively influenced the population abundances of species with a narrow age structure and short lifespan. The species affected by ENSO preferentially inhabit the continental shelf, suggesting that Mediterranean shelf ecosystems are sensitive to the hydroclimatic variability linked to global climate.

Changes in large-scale climate alter spatial synchrony of aphid pests

2015 ◽  
Vol 6 (6) ◽  
pp. 610-613 ◽  
Author(s):  
Lawrence W. Sheppard ◽  
James R. Bell ◽  
Richard Harrington ◽  
Daniel C. Reuman
Keyword(s):  
Large Scale ◽  
Spatial Synchrony

Synchrony in larval yellow perch abundance: the influence of the Moran Effect during early life history

2016 ◽  
Vol 73 (10) ◽  
pp. 1567-1574 ◽  
Author(s):  
Daniel J. Dembkowski ◽  
David W. Willis ◽  
Melissa R. Wuellner
Keyword(s):  
Yellow Perch ◽  
Spatial Scales ◽  
Population Characteristics ◽  
Freshwater Species ◽  
Population Fluctuations ◽  
Moran Effect ◽  
Spatial Synchrony ◽  
Geographic Scale ◽  
Data Set ◽  
Spatiotemporal Trends

Recruitment may vary substantially in fish populations, which can drive not only adult population characteristics but also the dynamics of fishes dependent on the species of interest and recreational fisheries for these species. However, spatiotemporal trends in population fluctuations and potential drivers of recruitment variability are poorly understood. Therefore, we used a long-term (2000–2014) data set to estimate the extent of spatial synchrony in larval abundance and factors influencing variability in recruitment of yellow perch (Perca flavescens). Contrary to the prevailing paradigm that spatial synchrony in population fluctuations (i.e., recruitment) is typically absent or occurs at small spatial scales (<50 km) for freshwater species, abundance of larval yellow perch was synchronous among spatially segregated systems across a geographic scale of at least 180 km. Additionally, variation in larval yellow perch density was influenced by spatially-correlated climatic and hydrological variables (indicative of the Moran Effect). Results ultimately broaden the scale at which factors were previously thought to influence recruitment of freshwater fishes and provide important insight to patterns and processes that structure yellow perch populations.

Population Dynamics of the Australian Plague Locust, Chortoicetes Terminifera (Walker) in Central Western New South Wales Iii. Analysis of Population Processes.

1982 ◽  
Vol 30 (4) ◽  
pp. 569 ◽  
Author(s):  
RA Farrow
Keyword(s):  
Large Scale ◽  
Local Population ◽  
Population Fluctuations ◽  
Density Dependent ◽  
Delayed Effects ◽  
South Wales ◽  
Key Factor ◽  
Population Processes ◽  
The Times ◽  
Australian Plague Locust

An analysis of population processes in the Australian plague locust showed that the key factor determining local population fluctuations was net migration. The density-disturbing effects of migration were over-compensated by the delayed effects of natural enemies on immature survival. There was no evidence that the amplitude of fluctuations was controlled at any stage by density-dependent processes, even at the highest densities encountered. Gregarization, although density-dependent and leading to daytime emigration: rarely stabilized population peaks because swarming populations remained relatively static. Densities never reached the carrying capacity of the habitats, even locally, because of the frequency of emigration at night. Local population extinctions due to emigration and low productivity were compensated by eventual immigration at night in favourable weather. In neither situation was the size of night migration shown to be density-dependent, although a spurious effect was detected. Variations in natality and survival had little influence on local population trends but, when synchronized over large areas by unusually favourable weather, influenced the course of large-scale fluctuations. Regional populations were more stable than local ones, due to spatial and temporal differences in reproductive success in a heterogeneous environment, and to peripheral emigration losses. Variations in the synoptic circulation and rainfall at the times of migration and reproduction cause stochastic processes to exert a major control of regional population fluctuations in the Australian plague locust.

scholarly journals Spatial synchrony in vegetation response

2019 ◽  
Author(s):  
Haim Weissman ◽  
Yaron Michael ◽  
Nadav M. Shnerb
Keyword(s):  
Remote Sensing ◽  
Large Scale ◽  
Time Lag ◽  
Remote Sensing Data ◽  
Structured Populations ◽  
Terrestrial Vegetation ◽  
Spatial Synchrony ◽  
Spatially Structured Populations ◽  
Power Law Function ◽  
Over Time

Spatial synchrony is ubiquitous in nature, and its decrease with the distance is an important feature that affects the viability of spatially structured populations. Here we present an empirical study of spatial synchrony in terrestrial vegetation using large scale remote sensing data. The decrease of synchrony with distance, as expressed by the correlation in rate of abundance change at a given time lag, is characterized using a power-law function with stretched-exponential cutoff. The range of these correlations appears to decrease when precipitation increases and to increase over time. The relevance of these results to the viability of populations is discussed.

scholarly journals Large-scale spatial synchrony and cross-synchrony in acorn production by two California oaks

Ecology ◽  
2013 ◽  
Vol 94 (1) ◽  
pp. 83-93 ◽  
Author(s):  
Walter D. Koenig ◽  
Johannes M. H. Knops
Keyword(s):  
Large Scale ◽  
Spatial Synchrony ◽  
Acorn Production
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