Spatial and Temporal Patterns of Small-Rodent Population Dynamics at a Regional Scale

Ecology ◽  
1996 ◽  
Vol 77 (8) ◽  
pp. 2365-2372 ◽  
Author(s):  
Harald Steen ◽  
Rolf A. Ims ◽  
Geir A. Sonerud
Keyword(s):  
Population Dynamics ◽  
Regional Scale ◽  
Temporal Patterns ◽  
Small Rodent ◽  
Spatial And Temporal Patterns ◽  
Rodent Population

scholarly journals Population cycles and outbreaks of small rodents: ten essential questions we still need to solve

Oecologia ◽  
2020 ◽  
Author(s):  
Harry P. Andreassen ◽  
Janne Sundell ◽  
Fraucke Ecke ◽  
Stefan Halle ◽  
Marko Haapakoski ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Large Amplitude ◽  
Driving Forces ◽  
Population Cycles ◽  
Small Rodent ◽  
Small Rodents ◽  
Rodent Population ◽  
The World ◽  
Essential Questions ◽  
Rodent Populations

AbstractMost small rodent populations in the world have fascinating population dynamics. In the northern hemisphere, voles and lemmings tend to show population cycles with regular fluctuations in numbers. In the southern hemisphere, small rodents tend to have large amplitude outbreaks with less regular intervals. In the light of vast research and debate over almost a century, we here discuss the driving forces of these different rodent population dynamics. We highlight ten questions directly related to the various characteristics of relevant populations and ecosystems that still need to be answered. This overview is not intended as a complete list of questions but rather focuses on the most important issues that are essential for understanding the generality of small rodent population dynamics.

scholarly journals Understanding spatial and temporal patterns in movement and habitat use of black-tailed deer in Northern California, USA

2021 ◽  
Author(s):  
◽  
Samhita Bose
Keyword(s):  
Population Dynamics ◽  
Spatial Scale ◽  
Resource Selection ◽  
Site Fidelity ◽  
Temporal Patterns ◽  
Habitat Characteristics ◽  
Home Ranges ◽  
Fine Scale ◽  
Spatial And Temporal Patterns ◽  
Trade Offs

<p>Black-tailed deer (BTD, Odocoileus hemionus columbianus), a socio-economically important deer species in western North America is steadily declining throughout much of its range over the last century. Though a large number of studies have been carried out on forage availability, predation pressure, and population dynamics of the species, there still remain broad gaps in current understanding of the underlying causes, mechanisms, and spatio-temporal patterns of habitat use which can affect the population dynamics and distribution of BTD. So, the central aim of my thesis was to identify the spatial and temporal scale that may affect habitat selection, movement and ultimately long-term persistence of the BTD population in the Mendocino National Forest, California.  Understanding population structuring in BTD is vital to underpin the spatial scale for conservation. So, I tested for presence of population sub-structuring among female BTD in the study area by analysing the combined effect of site fidelity and philopatry on the population. Fidelity analyses from radio-telemetry data revealed BTD to have extremely small seasonal home ranges (0.71 km²) and very high site fidelity to these ranges. Direct fitness benefits of fidelity were observed as individuals with decreased site fidelity to their ranges suffered elevated risks of mortality. Results from mtDNA sequencing revealed high genetic differentiation (FST > 0.30) and low haplotype sharing even among geographic areas separated by as little as 4–10 km. Combined, the results indicated prolonged period of philopatric behaviour resulting in demographic isolation and very small scale population sub-structuring that can impact the population dynamics at a finer spatial scale than previously assumed.  Next, I examined the effect of temporal scale on resource selection by BTD, through comparing habitat characteristics selected by BTD from a pooled model (all telemetry locations pooled across activity states) versus habitat characteristics associated with foraging (active state) and resting or ruminating (inactive state). The main factors that influenced resource selection in BTD were: 1) seasonal changes associated largely with variable selection towards slope, aspect, and elevation and 2) activity states influenced fine-scale selection towards vegetation type, edge density, and cover within the home-ranges. The comparative analysis also revealed that due to larger proportion of resting and ruminating locations, the pooled model frequently failed to identify critical foraging habitats and reflected habitats associated with resting. The frequent misidentification for important ecological covariates associated with foraging was a testimony that pooling data across activity states in BTD can negatively impact our understanding about habitat selection by the species.  Finally, I developed a movement model to understand the spatial and temporal patterns of risk-forage trade-offs by female BTD as a function of landscape familiarity. The results showed that familiarity affects the trade-off patterns by BTD in a heterogeneous landscape, with differential selection towards productivity and risk that also varied largely with habitat types. The results further revealed strong selection towards highly familiar areas by BTD during the night time and at dawn while stepping into less familiar areas during the daytime. The demonstrated preference for familiar locations within their home ranges when their primary predator (puma) is most active emphasizes that spatial familiarity is important not only for large scale processes like selection of home range, but also for striking fine-scale trade-offs between forage and risk within individual home ranges. The knowledge of this fine scale selection pattern is critical for maintaining habitat heterogeneity at a spatial scale comparable to the size of their home ranges, as they have vital consequences on fitness of BTD that ultimately affects the population dynamics of the species.</p>

Modelling Small Rodent Population Dynamics: Suggestions to Empiricists, Theoreticians and Editors

Oikos ◽  
1988 ◽  
Vol 52 (2) ◽  
pp. 227 ◽  
Author(s):  
Lennart Hansson ◽  
Nils Chr. Stenseth
Keyword(s):  
Population Dynamics ◽  
Small Rodent ◽  
Rodent Population

scholarly journals Statistical Sensitivity for Detection of Spatial and Temporal Patterns in Rodent Population Densities

1999 ◽  
Vol 5 (1) ◽  
pp. 118-125 ◽  
Author(s):  
Cheryl A. Parmenter ◽  
Terry L. Yates ◽  
Robert R. Parmenter ◽  
Jonathan L. Dunnum
Keyword(s):  
Temporal Patterns ◽  
Spatial And Temporal Patterns ◽  
Population Densities ◽  
Rodent Population
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