Abstract: Aedes albopictus
(Diptera; Culicidae) is a highly invasive mosquito species and a
competent vector of several arboviral diseases that have spread rapidly
throughout the world. Prevalence and patterns of dispersal of the
mosquito are of central importance for an effective control of the
species. We used site-occupancy models accounting for false negative
detections to estimate the prevalence, the turnover, the movement
pattern and the growth rate in the number of sites occupied by the
mosquito in 17 localities throughout Mallorca Island. Site-occupancy probability
increased from 0.35 in the 2012, year of first reported observation of
the species, to 0.89 in 2015. Despite a steady increase in mosquito
presence, the extinction probability was generally high indicating a
high turnover in the occupied sites. We considered two site-dependent
covariates, namely the distance from the point of first observation and
the estimated yearly occupancy rate in the neighborhood, as predicted by
diffusion models. Results suggested that mosquito distribution during
the first year was consistent with what predicted by simple diffusion
models, but was not consistent with the diffusion model in subsequent
years when it was similar to those expected from leapfrog dispersal
events. Assuming a single initial colonization event, the spread of Ae. albopictus
in Mallorca followed two distinct phases, an early one consistent with
diffusion movements and a second consistent with long distance,
‘leapfrog’, movements. The colonization of the island was fast, with
~90% of the sites estimated to be occupied 3 years after the
colonization. The fast spread was likely to have occurred through
vectors related to human mobility such as cars or other vehicles.
Surveillance and management actions near the introduction point would
only be effective during the early steps of the colonization.
The Bloooooog!
domingo, 17 de septiembre de 2017
New publication on Tiger Mosquito range expansion !
Tavecchia, G., Miranda, M.-A., Borrás, D., Bengoa, M., Barceló, C. Paredes-Esquivel, C. and Schwarz, C. 2017 Modelling the range expansion of the Tiger mosquito in a Mediterranean Island accounting for imperfect detection Frontiers in Zoology, 14:39-49 doi. 10.1186/s12983-017-0217-x
Abstract: Aedes albopictus
(Diptera; Culicidae) is a highly invasive mosquito species and a
competent vector of several arboviral diseases that have spread rapidly
throughout the world. Prevalence and patterns of dispersal of the
mosquito are of central importance for an effective control of the
species. We used site-occupancy models accounting for false negative
detections to estimate the prevalence, the turnover, the movement
pattern and the growth rate in the number of sites occupied by the
mosquito in 17 localities throughout Mallorca Island. Site-occupancy probability
increased from 0.35 in the 2012, year of first reported observation of
the species, to 0.89 in 2015. Despite a steady increase in mosquito
presence, the extinction probability was generally high indicating a
high turnover in the occupied sites. We considered two site-dependent
covariates, namely the distance from the point of first observation and
the estimated yearly occupancy rate in the neighborhood, as predicted by
diffusion models. Results suggested that mosquito distribution during
the first year was consistent with what predicted by simple diffusion
models, but was not consistent with the diffusion model in subsequent
years when it was similar to those expected from leapfrog dispersal
events. Assuming a single initial colonization event, the spread of Ae. albopictus
in Mallorca followed two distinct phases, an early one consistent with
diffusion movements and a second consistent with long distance,
‘leapfrog’, movements. The colonization of the island was fast, with
~90% of the sites estimated to be occupied 3 years after the
colonization. The fast spread was likely to have occurred through
vectors related to human mobility such as cars or other vehicles.
Surveillance and management actions near the introduction point would
only be effective during the early steps of the colonization.
Abstract: Aedes albopictus
(Diptera; Culicidae) is a highly invasive mosquito species and a
competent vector of several arboviral diseases that have spread rapidly
throughout the world. Prevalence and patterns of dispersal of the
mosquito are of central importance for an effective control of the
species. We used site-occupancy models accounting for false negative
detections to estimate the prevalence, the turnover, the movement
pattern and the growth rate in the number of sites occupied by the
mosquito in 17 localities throughout Mallorca Island. Site-occupancy probability
increased from 0.35 in the 2012, year of first reported observation of
the species, to 0.89 in 2015. Despite a steady increase in mosquito
presence, the extinction probability was generally high indicating a
high turnover in the occupied sites. We considered two site-dependent
covariates, namely the distance from the point of first observation and
the estimated yearly occupancy rate in the neighborhood, as predicted by
diffusion models. Results suggested that mosquito distribution during
the first year was consistent with what predicted by simple diffusion
models, but was not consistent with the diffusion model in subsequent
years when it was similar to those expected from leapfrog dispersal
events. Assuming a single initial colonization event, the spread of Ae. albopictus
in Mallorca followed two distinct phases, an early one consistent with
diffusion movements and a second consistent with long distance,
‘leapfrog’, movements. The colonization of the island was fast, with
~90% of the sites estimated to be occupied 3 years after the
colonization. The fast spread was likely to have occurred through
vectors related to human mobility such as cars or other vehicles.
Surveillance and management actions near the introduction point would
only be effective during the early steps of the colonization.
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