Alternatives to key factor analyses for assessing the population dynamics of Hypera postica (Coleoptera: Curculionidae)

Zahiri, Babak, Fathipour, Yaghoub, Khanjani, Mohammad, Moharramipour, Saeid and Zalucki, Myron Philip (2014) Alternatives to key factor analyses for assessing the population dynamics of Hypera postica (Coleoptera: Curculionidae). Population Ecology, 56 1: 185-194. doi:10.1007/s10144-013-0402-5


Author Zahiri, Babak
Fathipour, Yaghoub
Khanjani, Mohammad
Moharramipour, Saeid
Zalucki, Myron Philip
Title Alternatives to key factor analyses for assessing the population dynamics of Hypera postica (Coleoptera: Curculionidae)
Formatted title
Alternatives to key factor analyses for assessing the population dynamics of Hypera postica (Coleoptera: Curculionidae)
Journal name Population Ecology   Check publisher's open access policy
ISSN 1438-3896
1438-390X
Publication date 2014
Year available 2013
Sub-type Article (original research)
DOI 10.1007/s10144-013-0402-5
Volume 56
Issue 1
Start page 185
End page 194
Total pages 10
Place of publication Tokyo, Japan
Publisher Springer
Collection year 2014
Language eng
Formatted abstract
Key factors are those causes that are most responsible for the observed changes in population density between generations. Stage-frequency of alfalfa weevil was modeled using Manly-1997 model. Multiple decrement life table parameters from an 8 year-field study were analyzed using traditional and λ contribution methods. In traditional method, the key factor was determined as k LII, the death of period-two larvae from all mortality factors, whereas in λ contribution method, the key factor was determined as b 2&3, oviposition rate of females per square meter. These differences result directly from the sensitivity of the population growth rate, λ, to variation of both k and b in various stages of the weevil. Among all mortality factors, only k LI-Z, the death of period-one larvae from the entomopathogenic fungus, Zoophthora phytonomi (Arthur) Batko (Zygomycetes: Entomophthoraceae), k LII and k LII-Z, the death of period-two larvae from Z. phytonomi, acted in a density dependent fashion. Remaining factors were independent of population densities affected. Using λ contribution method, life table approach still remains a major way of studying the dynamics of field populations for applied ecologists and population managers.
Keyword Alfalfa weevil
Density dependence
Multiple decrement life table
Population regulation
Stage-structured population
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 21 September 2013.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Biological Sciences Publications
 
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