Heterogeneous Responses of Small Mammals to an El Nino Southern Oscillation Event in Northcentral Semiarid Chile and the Importance of Ecological Scale

Meserve, Peter L.; Yunger, John A.; Gutiérrez, Julio R.; González, Luis Carlos Contreras; Milstead, W. Bryan; Lang, Brian K.; Cramer, Kenneth L.; Herrera, Sergio Ramos; Lagos, Victor O.; Silva, Sergio I.; Tabilo, Elier L.; Torrealba, Miguel-Angel; Jaksic, Fabián M.

doi:10.2307/1382367

Cited by 125 publications

(125 citation statements)

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“…However, the actual length of these lags will vary among different rodent species, depending upon the time to sexual maturity, litter size, number of litters that can be produced per year, gestation period, and the types of foods consumed. 8,12 Regardless of the reasons for any observed lags in rodent population responses, they could be epidemiologically significant and might explain the importance of the lagged precipitation values in our models. In the Southwest, the frequency of human cases is closely associated with epizootic activity among certain highly susceptible hosts of plague, particularly ground squirrels (Spermophilus spp.…”

Section: Discussionmentioning

confidence: 95%

“…Unusual climatic events have been reported to be associated with large fluctuations in rodent populations. 8,12,[43][44][45][46] Variations in temperature and precipitation are known to affect the growth of plant 5,47-49 and insect [50][51][52][53] populations, both of which are important food sources for rodents in the Southwest. [54][55][56] At least some lag time can be expected to occur between the appearance of favorable environmental conditions and the occurrence of rodent population increases or increased levels of plague transmission among these animals.…”

Section: Discussionmentioning

confidence: 99%

“…1 Many factors can affect rodent population dynamics, including food availability, disease, and climatic variables, such as precipitation and temperature. [4][5][6][7][8][9][10][11][12] Seasonal fluctuations in the abundance of certain flea species also have been reported to be correlated with precipitation and temperature changes. [13][14][15][16][17] Additionally, the ability of fleas to transmit Y. pestis has been demonstrated to be temperature-dependent, with high temperatures (Ն 81.5ЊF, Ն 27.5ЊC) resulting in reduced rates of transmission.…”

Section: Introductionmentioning

confidence: 99%

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Modeling relationships between climate and the frequency of human plague cases in the southwestern United States, 1960-1997.

Enscore¹,

Biggerstaff²,

Brown³

et al. 2002

The American Journal of Tropical Medicine and Hygiene

157

158

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Abstract. The relationships between climatic variables and the frequency of human plague cases were modeled by Poisson regression for two adjoining regions in northeastern Arizona and northwestern New Mexico. Model outputs closely agreed with the numbers of cases actually observed, suggesting that temporal variations in plague risk can be estimated by monitoring key climatic variables, most notably maximum daily summer temperature values and time-lagged (1 and 2 year) amounts of late winter (February-March) precipitation. Significant effects also were observed for time-lagged (1 year) summer precipitation in the Arizona model. Increased precipitation during specific periods resulted in increased numbers of expected cases in both regions, as did the number of days above certain lower thresholds for maximum daily summer temperatures (80ЊF in New Mexico and 85ЊF in Arizona). The number of days above certain high-threshold temperatures exerted a strongly negative influence on the numbers of expected cases in both the Arizona and New Mexico models (95ЊF and 90ЊF, respectively). The climatic variables found to be important in our models are those that would be expected to influence strongly the population dynamics of the rodent hosts and flea vectors of plague.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modeling relationships between climate and the frequency of human plague cases in the southwestern United States, 1960-1997.

Enscore¹,

Biggerstaff²,

Brown³

et al. 2002

The American Journal of Tropical Medicine and Hygiene

157

158

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“…It has been hypothesized that increased precipitation in the arid southwestern United States increases primary production, which then increases rodent populations (Yates et al, 2002). Increased rodent densities were associated with increased precipitation in some environments (Beatley, 1969;Meserve et al, 1995;Brown and Ernest, 2002). However, primary production does not always show a direct response to variations in precipitation.…”

Section: Discussionmentioning

confidence: 99%

Brush Mouse (Peromyscus Boylii ) Population Dynamics and Hantavirus Infection During a Warm, Drought Period in Southern Arizona

Kuenzi

Morrison

Madhav

et al. 2007

Journal of Wildlife Diseases

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ABSTRACT:We monitored Limestone Canyon hantavirus (LSCV) antibody prevalence, host (brush mouse, Peromyscus boylii) abundance, and environmental variables (temperature and rainfall) in brush mice captured on three trapping webs in southern Arizona for 5 yr. Although seasonal patterns were subtle, we observed large multiyear variation in population abundance and antibody prevalence. Limestone Canyon hantavirus infection in brush mouse populations varied over time with prevalence ranging from 0% to 33%. At all trapping webs, evidence of infection disappeared completely for an extended period (up to 2 yr) and eventually reappeared, suggesting that dispersal may play a role in maintaining infection in brush mouse metapopulations. Weather during the study period was drier and warmer than average and these conditions, especially during spring through fall, may have contributed to low brush mouse population density and the local extinction of LSCV during the second year of the study. Nevertheless, population growth was associated with relatively warm, dry conditions during winter periods and a cool, wet spring and summer period in the fifth year of the study. After prolonged absence, LSCV infection was consistently detected only when brush mouse population abundance reached relatively high levels during that fifth year. Comparison of our results to similar studies suggests that stochastic events resulting in the loss or survival of a few infected mice in low-density host populations may result in local extinction of virus; reestablishment of infection may occur via immigration of infected individuals from adjacent populations, but may be successful only when populations are of sufficient density to support frequent rodent-to-rodent interactions and virus transmission.

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“…Vegetation in north-central Chile is precariously dependant upon rainfall variations such that annual fluctuations can have large impacts and anomalous climate behavior should be easily identified through satellite images (Meserve et al 1995;Dillon and Rundel 1990). The land is split between small-scale communal property and better capitalized private lands and this will provide an excellent opportunity to contrast agricultural realities.…”

Section: Case Study: Chilean Andes Mountainsmentioning

confidence: 99%

GIS/Remote sensing techniques for resource management and biodiversity protection in mountainous regions

All

2010

Botanica Orientalis

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Biodiversity protection in mountainous regions requires effective fact-driven resource management techniques. Geoinformatic tools including GIS and remote sensing can be integrated to provide regional-scale data products across time for use in strategic and management level policymaking. Several principles are discussed to ensure that geoinformatics data and analysis can effectively contribute to resource management by clarifying issues and minimizing misinterpretation. A case study in the Chilean Andes elucidates these principles. Biological impacts of recent climate changes have not been equal across different ecosystems and stable forest ecosystems provide the best response to climate change. Geoinformatics is used to differentiate functional ecological groups and evaluate long-term resilience to climate change.

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Heterogeneous Responses of Small Mammals to an El Nino Southern Oscillation Event in Northcentral Semiarid Chile and the Importance of Ecological Scale

Cited by 125 publications

References 0 publications

Modeling relationships between climate and the frequency of human plague cases in the southwestern United States, 1960-1997.

Modeling relationships between climate and the frequency of human plague cases in the southwestern United States, 1960-1997.

Brush Mouse (Peromyscus Boylii ) Population Dynamics and Hantavirus Infection During a Warm, Drought Period in Southern Arizona

GIS/Remote sensing techniques for resource management and biodiversity protection in mountainous regions

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