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Increases in both temperature means and extremes likely facilitate invasive herbivore outbreaks.

Ju RT, Zhu HY, Gao L, Zhou XH, Li B - Sci Rep (2015)

Bottom Line: We found that the three warming regimes significantly increased the developmental rate but did not affect the survival, sex ratio, longevity, or fecundity of C. ciliata.The demographic parameters did not significantly differ among the three populations.The increases in summer temperature associated with climate change, therefore, would likely facilitate population outbreaks of some thermophilic invasive insects.

View Article: PubMed Central - PubMed

Affiliation: Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Fudan University, 2005 Songhu Road, Shanghai 200438, China.

ABSTRACT
Although increases in mean temperature (MT) and extreme high temperature (EHT) can greatly affect population dynamics of insects under global warming, how concurrent changes in both MT and EHT affect invasive species is largely unknown. We used four thermal regimes to simulate the increases in summer temperature and compared their effects on the life-history traits of three geographical populations (Chongqing, Wuhan and Shanghai) of an invasive insect, Corythucha ciliata, in China. The four thermal regimes were control (i.e., natural or ambient), an increase in MT (IMT), an increase in EHT, and a combination of IMT + EHT. We found that the three warming regimes significantly increased the developmental rate but did not affect the survival, sex ratio, longevity, or fecundity of C. ciliata. Consequently, the intrinsic rate of natural increase (rm) was enhanced and the number of days required for population doubling (t) was reduced by the warming regimes. The demographic parameters did not significantly differ among the three populations. These results indicate that population size of C. ciliata may be enhanced by increases in both temperature means and extremes. The increases in summer temperature associated with climate change, therefore, would likely facilitate population outbreaks of some thermophilic invasive insects.

No MeSH data available.


The intrinsic rate of population increase (rm) (a) and the time required for population doubling (t) (b) for three populations of C. ciliata as affected by four temperature regimes.Red, green and blue columns represent the Shanghai, Wuhan, and Chongqing population, respectively. The temperature regimes are described in Fig. 6. Different capital letters indicate significant differences among the warming regimes (P < 0.05). ANOVA statistics are provided in Table 1.
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f4: The intrinsic rate of population increase (rm) (a) and the time required for population doubling (t) (b) for three populations of C. ciliata as affected by four temperature regimes.Red, green and blue columns represent the Shanghai, Wuhan, and Chongqing population, respectively. The temperature regimes are described in Fig. 6. Different capital letters indicate significant differences among the warming regimes (P < 0.05). ANOVA statistics are provided in Table 1.

Mentions: The intrinsic rate of population increase (rm) for C. ciliata was higher in IMT, EHT, and MHT than in NAT (Table 1 and Fig. 4a). Consequently, the time required for population doubling (t) was significantly shorter in the warming regimes than that in the natural regime (Table 1 and Fig. 4b). The demographic parameters were not significantly affected by population provenance (Table 1) and were also similar among IMT, EHT, and MHT regimes (Fig. 4a,b).


Increases in both temperature means and extremes likely facilitate invasive herbivore outbreaks.

Ju RT, Zhu HY, Gao L, Zhou XH, Li B - Sci Rep (2015)

The intrinsic rate of population increase (rm) (a) and the time required for population doubling (t) (b) for three populations of C. ciliata as affected by four temperature regimes.Red, green and blue columns represent the Shanghai, Wuhan, and Chongqing population, respectively. The temperature regimes are described in Fig. 6. Different capital letters indicate significant differences among the warming regimes (P < 0.05). ANOVA statistics are provided in Table 1.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4622076&req=5

f4: The intrinsic rate of population increase (rm) (a) and the time required for population doubling (t) (b) for three populations of C. ciliata as affected by four temperature regimes.Red, green and blue columns represent the Shanghai, Wuhan, and Chongqing population, respectively. The temperature regimes are described in Fig. 6. Different capital letters indicate significant differences among the warming regimes (P < 0.05). ANOVA statistics are provided in Table 1.
Mentions: The intrinsic rate of population increase (rm) for C. ciliata was higher in IMT, EHT, and MHT than in NAT (Table 1 and Fig. 4a). Consequently, the time required for population doubling (t) was significantly shorter in the warming regimes than that in the natural regime (Table 1 and Fig. 4b). The demographic parameters were not significantly affected by population provenance (Table 1) and were also similar among IMT, EHT, and MHT regimes (Fig. 4a,b).

Bottom Line: We found that the three warming regimes significantly increased the developmental rate but did not affect the survival, sex ratio, longevity, or fecundity of C. ciliata.The demographic parameters did not significantly differ among the three populations.The increases in summer temperature associated with climate change, therefore, would likely facilitate population outbreaks of some thermophilic invasive insects.

View Article: PubMed Central - PubMed

Affiliation: Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Fudan University, 2005 Songhu Road, Shanghai 200438, China.

ABSTRACT
Although increases in mean temperature (MT) and extreme high temperature (EHT) can greatly affect population dynamics of insects under global warming, how concurrent changes in both MT and EHT affect invasive species is largely unknown. We used four thermal regimes to simulate the increases in summer temperature and compared their effects on the life-history traits of three geographical populations (Chongqing, Wuhan and Shanghai) of an invasive insect, Corythucha ciliata, in China. The four thermal regimes were control (i.e., natural or ambient), an increase in MT (IMT), an increase in EHT, and a combination of IMT + EHT. We found that the three warming regimes significantly increased the developmental rate but did not affect the survival, sex ratio, longevity, or fecundity of C. ciliata. Consequently, the intrinsic rate of natural increase (rm) was enhanced and the number of days required for population doubling (t) was reduced by the warming regimes. The demographic parameters did not significantly differ among the three populations. These results indicate that population size of C. ciliata may be enhanced by increases in both temperature means and extremes. The increases in summer temperature associated with climate change, therefore, would likely facilitate population outbreaks of some thermophilic invasive insects.

No MeSH data available.