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Bruce G. Williamson - One of the best experts on this subject based on the ideXlab platform.

Mario Díaz - One of the best experts on this subject based on the ideXlab platform.

  • The efficiency of two widely used commercial live-traps to develop monitoring protocols for small mammal biodiversity
    Ecological Indicators, 2016
    Co-Authors: Ignasi Torre, Lídia Freixas, Antoni Arrizabalaga, Mario Díaz
    Abstract:

    Biodiversity monitoring programs have been implemented worldwide as a source of information on ecosystem functioning. However, controversy concerning the indicators that should be monitored, and the development of adequate monitoring protocols for multi-species communities still hamper such implementation, especially in the case of small mammals. We analyze differences in the efficiency of the two most widely used commercial traps (Longworth and Sherman) working simultaneously in eight different mountain habitats in Andorra country (NE Iberia) as a first step for establishing standardized sampling protocols for species-rich small mammal communities. From summer 2008 to fall 2010 (six sampling occasions) we captured a total of 728 small mammal individuals (1445 including recaptures) of 13 species (12 in Longworth and 11 in Sherman, 10 species shared). Despite some specific biases (underestimation of two large species by Longworth traps and underestimation of one small species by Sherman traps), estimates of community parameters and similarity indexes, sampling efficiency (number of small mammals trapped), detectability, mean weight, and sex-ratio of the most abundant species, were similar for both sampling methods. Our results suggested that both trap models could be used interchangeably – without relevant biases – in small mammal community assessments where large species are infrequent. Focussing monitoring programs on highly detectable small mammal species (common species) would allow the establishment of robust monitoring programs aimed at reducing the time invested and economic costs.

Thomas S. Jung - One of the best experts on this subject based on the ideXlab platform.

  • Comparative efficacy of Longworth, Sherman, and Ugglan live-traps for capturing small mammals in the Nearctic boreal forest
    Mammal Research, 2015
    Co-Authors: Thomas S. Jung
    Abstract:

    Understanding the efficacy of various types of traps is important in the design of field studies. Surprisingly, few studies have compared the relative efficacy of different types of commercially manufactured live-traps for capturing small mammals. I compared the performance of Longworth, Sherman, and Ugglan small mammal live-traps in Nearctic boreal forests. All three trap types were simultaneously set at 275 trapping stations, and animals were provided a choice of traps to enter. Number, sex, and age class of captures as well as mortality and recapture rates were compared among trap types. Captures were dominated (87 %) by red-backed voles (Myodes rutilus). Sherman traps captured significantly fewer animals than did either Longworth or Ugglan traps, but there was no difference in the sex or age class of individuals captured among trap types. Percent of mortalities varied by trap type, with the highest percentage of mortalities occurring in Sherman traps. Red-backed voles captured in Sherman traps had a significantly higher likelihood of not being recaptured again in a Sherman trap. Overall, this study found that Longworth and Ugglan traps performed similarly with respect to capturing red-backed voles and deer mice (Peromyscus spp.) in boreal forest. Sherman traps, however, were not as efficient. This difference may be particularly significant for studies relying on mark-recapture data. The relative efficacy of different trap types is likely species- and habitat-specific, and further studies in different environments are necessary. These data may assist researchers in making objective choices of which type of live-trap to employ in their research and in critically comparing results from studies using different trap types.

James L. Mackinnon - One of the best experts on this subject based on the ideXlab platform.

  • The relative efficiency of two commercial live‐traps for small mammals
    Journal of Zoology, 2009
    Co-Authors: Xavier Lambin, James L. Mackinnon
    Abstract:

    Data obtained from live-trapping a population of field voles, Microtus agrestis, over a seven-month period was used to compare the trapping efficiencies of the Longworth and the Ugglan Mouse Special traps. The Ugglan Mouse Special is a cheaper alternative that is widely used in Scandinavia. Biases in the sex or age of captured animals were the same for both types of trap and the total numbers of captures were similar. There was no evidence that individual animals were more likely to be captured in the same type of trap at each capture session. We conclude that the Ugglan Mouse Special trap is a practical alternative to the Longworth trap for studies of small mammals by capture-mark-recapture techniques.

Benjamin J. Longworth - One of the best experts on this subject based on the ideXlab platform.

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