New Insights into the Importance of Rodent Populations in a Zoo Ecosystem in the Pathology and Spread of Calodium hepaticum in Primates

2013 ◽  
Vol 148 (1) ◽  
pp. 56
Author(s):  
J. Correia ◽  
A. Crespo ◽  
R. Noiva ◽  
H. Pissarra ◽  
T. Fernandes ◽  
...  
Keyword(s):  
Calodium Hepaticum ◽  
Rodent Populations

Calodium hepaticum (Nematoda: Capillariidae) in wild rodent populations from Argentina

2018 ◽  
Vol 117 (9) ◽  
pp. 2921-2926 ◽  
Author(s):  
María C. Fantozzi ◽  
María del Rosario Robles ◽  
Fiama E. Peña ◽  
Leandro R. Antoniazzi ◽  
Pablo M. Beldomenico ◽  
...  
Keyword(s):  
Wild Rodent ◽  
Calodium Hepaticum ◽  
Rodent Populations

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 The effect of COVID19 pandemic restrictions on an urban rodent population

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Miguel A. Bedoya-Pérez ◽  
Michael P. Ward ◽  
Max Loomes ◽  
Iain S. McGregor ◽  
Mathew S. Crowther
Keyword(s):  
Binary Data ◽  
Sampling Interval ◽  
Resource Scarcity ◽  
Health Authorities ◽  
Before And After ◽  
Directional Change ◽  
Public Health Authorities ◽  
Bait Stations ◽  
Rodent Populations ◽  
The City

AbstractShortly after the enactment of restrictions aimed at limiting the spread of COVID-19, various local government and public health authorities around the world reported an increased sighting of rats. Such reports have yet to be empirically validated. Here we combined data from multi-catch rodent stations (providing data on rodent captures), rodent bait stations (providing data on rodent activity) and residents’ complaints to explore the effects of a six week lockdown period on rodent populations within the City of Sydney, Australia. The sampling interval encompassed October 2019 to July 2020 with lockdown defined as the interval from April 1st to May 15th, 2020. Rodent captures and activity (visits to bait stations) were stable prior to lockdown. Captures showed a rapid increase and then decline during the lockdown, while rodent visits to bait stations declined throughout this period. There were no changes in the frequency of complaints during lockdown relative to before and after lockdown. There was a non-directional change in the geographical distribution of indices of rodent abundance suggesting that rodents redistributed in response to resource scarcity. We hypothesize that lockdown measures initially resulted in increased rodent captures due to sudden shortage of human-derived food resources. Rodent visits to bait stations might not show this pattern due to the nature of the binary data collected, namely the presence or absence of a visit. Relocation of bait stations driven by pest management goals may also have affected the detection of any directional spatial effect. We conclude that the onset of COVID-19 may have disrupted commensal rodent populations, with possible implications for the future management of these ubiquitous urban indicator species.

The Prevalence of Trypanosoma cruzi, the Causal Agent of Chagas Disease, in Texas Rodent Populations

EcoHealth ◽  
2017 ◽  
Vol 14 (1) ◽  
pp. 130-143 ◽  
Author(s):  
Adriana Aleman ◽  
Trina Guerra ◽  
Troy J. Maikis ◽  
Matthew T. Milholland ◽  
Ivan Castro-Arellano ◽  
...  
Keyword(s):  
Trypanosoma Cruzi ◽  
Chagas Disease ◽  
Causal Agent ◽  
Rodent Populations

scholarly journals Parasitismo por Calodium hepaticum em dois cães

2009 ◽  
Vol 39 (9) ◽  
pp. 2642-2645 ◽  
Author(s):  
Heloísa Einloft Palma ◽  
Paula Cristina Basso ◽  
Anne Santos do Amaral ◽  
Ana Paula Silva ◽  
Cândido Fontoura Silva
Keyword(s):  
Rio Grande ◽  
Rio Grande Do Sul ◽  
Calodium Hepaticum ◽  
Insuficiencia Cardiaca ◽  
Santa Maria

Calodium hepaticum já foi relatado parasitando o parênquima hepático de diversas espécies de mamíferos, porém é infrequente em cães. O presente artigo tem o objetivo de descrever dois casos de capilariose hepática em cães, diagnosticados em um período de um mês na região de Santa Maria, Rio Grande do Sul, Brasil. O primeiro cão apresentava sintomatologia clínica de insuficiência cardíaca, e ovos de Calodium hepaticum foram encontrados ocasionalmente no exame histopatológico do fígado. O segundo animal apresentava mucosas ictéricas e ascite. No hemograma, ficou evidente a presença de anemia arregenerativa e, na avaliação de bioquímica sérica, percebeu-se aumento de fosfatase alcalina, alanina aminotransferase e hipoalbuminemia. A análise do liquido cavitário foi compatível com transudato modificado. No exame histopatológico, foram observados numerosos ovos bioperculados de Calodium hepaticum, dispostos aleatoriamente pelo parênquima hepático, com reação granulomatosa e fibrosa adjacente aos ovos. A existência de maior número de cães infectados demonstra a necessidade de controle da população de roedores.

Survey and control of small mammal populations on two hardwood plantations in southern Ontario

1974 ◽  
Vol 50 (5) ◽  
pp. 181-185 ◽  
Author(s):  
Andrew Radvanyi
Keyword(s):  
Small Mammal ◽  
Late Summer ◽  
Control Measures ◽  
Effective Control ◽  
Southern Ontario ◽  
Live Trapping ◽  
Surrounding Areas ◽  
And Control ◽  
Rodent Populations ◽  
Ingredient Cost

Live trapping and tagging methods were employed to assess small mammal populations within two hardwood plantations in southern Ontario. Excessive girdling damage in past years to young planted trees necessitated an evaluation of rodent populations and development of effective control measures. The application of an anticoagulant rodenticide to oat groats bait broadcast over the study area at an ingredient cost of approximately three dollars per acre virtually wiped out the small mammals. Reinvasion from surrounding areas was, however, fairly rapid, particularly during late summer. Further research on longer term control measures using poisoned bait feeder stations is recommended.

Influence of Predation on Rodent Populations

Oikos ◽  
1977 ◽  
Vol 29 (3) ◽  
pp. 591 ◽  
Author(s):  
M. Andersson ◽  
S. Erlinge
Keyword(s):  
Rodent Populations

Direct and indirect effects of masting on rodent populations and tree seed survival

Oikos ◽  
2002 ◽  
Vol 96 (3) ◽  
pp. 402-410 ◽  
Author(s):  
Jaclyn L. Schnurr ◽  
Richard S. Ostfeld ◽  
Charles D. Canham
Keyword(s):  
Indirect Effects ◽  
Direct And Indirect Effects ◽  
Seed Survival ◽  
Rodent Populations ◽  
Tree Seed

A population study of small rodents in a dry sub-humid grassland in Kenya

1985 ◽  
Vol 1 (3) ◽  
pp. 217-224 ◽  
Author(s):  
G. H. G. Martin
Keyword(s):  
Population Study ◽  
Annual Production ◽  
Small Rodents ◽  
Numerous Species ◽  
Tropical Grassland ◽  
Live Trapping ◽  
Mus Minutoides ◽  
Turn Over ◽  
Rodent Populations ◽  
Trapping Grid

ABSTRACTEstimates were made of rodent longevity, population biomass and production in a dry sub-humid grassland area in Kenya, The results were based on a live-trapping study made over a 27-month period. During this time fourteen species of rodents and four species of insectivores were recorded from the area of the trapping grid. The most numerous species were Praomys natalensis, Mus triton, Mus minutoides and Lemniscomys striatus.Breeding took place in both wet seasons, coinciding with peaks in rodent populations. Densities ranged from 6.6 ha-1 to 52.4 ha-1, and estimates of net annual production varied from 5485 g ha-1 year-1 to 7221 g ha-1 year-1. Rodent populations appear to turn over every six to nine months.The results are discussed in relation to studies in other tropical grassland areas of Africa.

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