Unexpected larval habit of Listronotus bonariensis (Coleoptera: Curculionidae) raises questions about population dynamics analysis and management

2021 ◽  
Author(s):  
Mark Richard McNeill ◽  
Chikako Koten ◽  
Stephen Latham Goldson
Keyword(s):  
Population Dynamics ◽  
Dynamics Analysis ◽  
Listronotus Bonariensis

Population dynamics of the coconut caterpillar, Opisina arenosella Walker (Lepidoptera: Xyloryctidae), in Sri Lanka

1988 ◽  
Vol 78 (3) ◽  
pp. 479-492 ◽  
Author(s):  
P. A. C. R. Perera ◽  
M. P. Hassell ◽  
H. C. J. Godfray
Keyword(s):  
Population Dynamics ◽  
Sri Lanka ◽  
Dynamics Analysis ◽  
Triggering Mechanism ◽  
Working Hypothesis ◽  
Opisina Arenosella ◽  
Population Outbreaks ◽  
Pupal Parasitism ◽  
Generation Period

AbstractOpisina arenosella Walker is a defoliating pest of coconut in Sri Lanka. A first attempt was made to understand its population dynamics. Analysis of records of population outbreaks throughout the country from 1965 to 1985 revealed cycles in the population of approximately one generation period, giving the population the appearance of partially discrete generations. There was also evidence for longer cycles of six-month period. Outbreaks occurred throughout the coconut-growing regions of Sri Lanka, and the numbers of outbreaks per year in different provinces were sometimes correlated, indicating a common, probably climatic, triggering mechanism. Parasitism remained high throughout the outbreaks and there was some evidence that pupal parasitism increased towards the end of an outbreak. A working hypothesis that explains the population dynamics of O. arenosella and the origin of outbreaks is presented.

UnexpectedListronotus bonariensis(Coleoptera: Curculionidae) mortality in the presence of parasitoids

2004 ◽  
Vol 94 (5) ◽  
pp. 411-417 ◽  
Author(s):  
S.L. Goldson ◽  
J.R. Proffitt ◽  
M.R. McNeill ◽  
C.B. Phillips ◽  
N.D. Barlow ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Mortality Rates ◽  
Ecological Significance ◽  
Time Intervals ◽  
Larval Parasitoid ◽  
Mortality Effect ◽  
Listronotus Bonariensis ◽  
Field And Laboratory Conditions ◽  
The Impact ◽  
Microctonus Hyperodae

AbstractField enclosure and laboratory cage experiments designed to measure the impact of the parasitoidMicroctonus hyperodaeLoan on the Argentine stem weevil,Listronotus bonariensis(Kuschel) have shown that under high parasitoid pressure, there is significant weevil mortality without obvious parasitism. Parasitoid-exposed, but unparasitized portions of caged populations died at rates significantly higher than both the parasitized weevils from the same population and the unexposed controls. Unexpectedly, parasitized weevils had the lowest mortality rates (prior to larval parasitoid emergence). It was of ecological significance that this mortality effect was detected under field conditions using several years of empirically-collected population dynamics data. Under both field and laboratory conditions this mortality was found to occur within shorter time intervals than that required for full parasitoid larval development; thus it could not be attributed to the mortality that occurs after the emergence of prepupal parasitoids. The mechanism for this mortality remains undetermined, although it could possibly be linked to pseudoparasitism.

Two New Competition Indexes on the Basis of Lotka-Volterra Competition Model

2013 ◽  
Author(s):  
Huayong Zhang ◽  
Tousheng Huang ◽  
Liming Dai
Keyword(s):  
Population Dynamics ◽  
Equilibrium Point ◽  
Interspecific Competition ◽  
Competition Model ◽  
Volterra Model ◽  
Dynamics Analysis ◽  
Competitive Process ◽  
Stability Of Equilibrium ◽  
The Stability ◽  
Strength Of Competition

In this research, two competition indexes, competing capacity and competing tensor, are brought forward to better understand the interspecific competition between species. With the employment of the two indexes, the competitive process in Lotka-Volterra model can be described much clearly. The strength of competition for a species is divided into three competition grades according to the competing tensor. In the interspecific competition, when two species are in different competition grades, the weak species will be excluded; when two species are in the same grade, the coexistent equilibrium will present. Two cases are studied with the methods by employing the two indexes. In the second case, the stability of equilibrium point is determined by the competing tensor. The new indexes have shown potential in population dynamics analysis.

Design of bacterial defined mixed cultures for biodegradation of specific crude oil fractions, using population dynamics analysis by DGGE

2008 ◽  
Vol 62 (1) ◽  
pp. 21-30 ◽  
Author(s):  
I.J. Díaz-Ramírez ◽  
E. Escalante-Espinosa ◽  
E. Favela-Torres ◽  
M. Gutiérrez-Rojas ◽  
H. Ramírez-Saad
Keyword(s):  
Population Dynamics ◽  
Crude Oil ◽  
Mixed Cultures ◽  
Dynamics Analysis ◽  
Oil Fractions ◽  
Crude Oil Fractions
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