Evaluation of Two Density Estimators of Small Mammal Population Size

1985 ◽  
Vol 66 (1) ◽  
pp. 13-21 ◽  
Author(s):  
K. R. Wilson ◽  
D. R. Anderson
Keyword(s):  
Population Size ◽  
Small Mammal ◽  
Small Mammal Population ◽  
Density Estimators

Recovery of small rodent populations after population collapse

2015 ◽  
Vol 42 (2) ◽  
pp. 108 ◽  
Author(s):  
S. Hein ◽  
J. Jacob
Keyword(s):  
Population Size ◽  
Pest Control ◽  
Small Mammal ◽  
Recovery Time ◽  
Small Scale ◽  
Small Rodent ◽  
Population Recovery ◽  
Population Collapse ◽  
Small Mammal Population ◽  
Recovery Mechanisms

In this review we summarise published knowledge regarding small mammal population recovery following sudden population collapse, regardless as to whether the collapse is caused by natural or man-made events. We determine recovery mechanisms, recovery time and recovery rate, and suggest how to adapt and optimise current methods to regulate small mammal population size, for pest management and/or conservation. It is vital that the principles underlying the recovery mechanisms are known for both pest control and conservation to align management methods to either maintain animal numbers at a permanent minimum level or increase population size. Collapses can be caused naturally, as in the declining phase of multi-annual fluctuations and after natural disasters, or by man-made events, such as pesticide application. In general, there are three ways population recovery can occur: (1) in situ survival and multiplication of a small remaining fraction of the population; (2) immigration; or (3) a combination of the two. The recovery mechanism strongly depends on life history strategy, social behaviour and density-dependent processes in population dynamics of the species in question. In addition, the kind of disturbance, its intensity and spatial scale, as well as environmental circumstances (e.g. the presence and distance of refuge areas) have to be taken into account. Recovery time can vary from a couple of days to several years depending on the reproductive potential of the species and the type of disturbances, regardless of whether the collapse is man made or natural. Ultimately, most populations rebound to levels equal to numbers before the collapse. Based on current knowledge, case-by-case decisions seem appropriate for small-scale conservation. For pest control, a large-scale approach seems necessary. Further investigations are required to make sound, species-specific recommendations.

Estimation of Small-Mammal Population Size

Ecology ◽  
1988 ◽  
Vol 69 (6) ◽  
pp. 1952-1959 ◽  
Author(s):  
George E. Menkens ◽  
Stanley H. Anderson
Keyword(s):  
Population Size ◽  
Small Mammal ◽  
Small Mammal Population

Woodrats and Cholla: Dependence of a Small Mammal Population on the Density of Cacti

Ecology ◽  
1972 ◽  
Vol 53 (2) ◽  
pp. 310-313 ◽  
Author(s):  
James H. Brown ◽  
Gerald A. Lieberman ◽  
William F. Dengler
Keyword(s):  
Small Mammal ◽  
Small Mammal Population

Silvicultural Use of Herbicide in Sub-Boreal Spruce Forest: Implications for Small Mammal Population Dynamics

1998 ◽  
Vol 62 (4) ◽  
pp. 1196 ◽  
Author(s):  
Thomas P. Sullivan ◽  
Christopher Nowotny ◽  
R. A. Lautenschlager ◽  
Robert G. Wagner
Keyword(s):  
Population Dynamics ◽  
Small Mammal ◽  
Spruce Forest ◽  
Small Mammal Population

scholarly journals About rats and jackfruit trees: modeling the carrying capacity of a Brazilian Atlantic Forest spiny-rat Trinomys dimidiatus (Günther, 1877) – Rodentia, Echimyidae – population with varying jackfruit tree (Artocarpus heterophyllus L.) abundances

2015 ◽  
Vol 75 (1) ◽  
pp. 208-215 ◽  
Author(s):  
JHF Mello ◽  
TP Moulton ◽  
DSL Raíces ◽  
HG Bergallo
Keyword(s):  
Mathematical Model ◽  
Population Size ◽  
Seed Production ◽  
Atlantic Forest ◽  
Small Mammal ◽  
Carrying Capacity ◽  
Real Data ◽  
Brazilian Atlantic Forest ◽  
Artocarpus Heterophyllus ◽  
Small Mammal Community

We carried out a six-year study aimed at evaluating if and how a Brazilian Atlantic Forest small mammal community responded to the presence of the invasive exotic species Artocarpus heterophyllus, the jackfruit tree. In the surroundings of Vila Dois Rios, Ilha Grande, RJ, 18 grids were established, 10 where the jackfruit tree was present and eight were it was absent. Previous results indicated that the composition and abundance of this small mammal community were altered by the presence and density of A. heterophyllus. One observed effect was the increased population size of the spiny-rat Trinomys dimidiatus within the grids where the jackfruit trees were present. Therefore we decided to create a mathematical model for this species, based on the Verhulst-Pearl logistic equation. Our objectives were i) to calculate the carrying capacity K based on real data of the involved species and the environment; ii) propose and evaluate a mathematical model to estimate the population size of T. dimidiatus based on the monthly seed production of jackfruit tree, Artocarpus heterophyllus and iii) determinate the minimum jackfruit tree seed production to maintain at least two T. dimidiatus individuals in one study grid. Our results indicated that the predicted values by the model for the carrying capacity K were significantly correlated with real data. The best fit was found considering 20~35% energy transfer efficiency between trophic levels. Within the scope of assumed premises, our model showed itself to be an adequate simulator for Trinomys dimidiatus populations where the invasive jackfruit tree is present.

Small-Mammal Population of a Prairie Grove

1950 ◽  
Vol 31 (1) ◽  
pp. 17 ◽  
Author(s):  
Glen C. Sanderson
Keyword(s):  
Small Mammal ◽  
Small Mammal Population

scholarly journals Validation of hair tubes for small mammal population studies

2018 ◽  
Vol 99 (2) ◽  
pp. 478-485
Author(s):  
François Chiron ◽  
Susanne Hein ◽  
Rémi Chargé ◽  
Romain Julliard ◽  
Léo Martin ◽  
...  
Keyword(s):  
Small Mammal ◽  
Population Studies ◽  
Small Mammal Population

Effect of Habitat Disturbance on a Small Mammal Population

1959 ◽  
Vol 40 (3) ◽  
pp. 425 ◽  
Author(s):  
Joseph LoBue ◽  
Rezneat M. Darnell
Keyword(s):  
Small Mammal ◽  
Habitat Disturbance ◽  
Small Mammal Population
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