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Effects of Consumption of Bt-maize (MON 810) on the Collembolan Folsomia candida, Over Multiple Generations: A Laboratory Study.

Bakonyi G, Dolezsai A, Mátrai N, Székács A - Insects (2011)

Bottom Line: The effect of long-term feeding on Bt-maize by collembolans in the laboratory is virtually unestablished.Significant differences were found in food consumption, egg production and food preference between populations in some cases, but no time-response effect was observed.In conclusion, several generations feeding of F. candida on Cry1Ab toxin containing Bt-maize seems not to be harmful to this collembolan species.

View Article: PubMed Central - PubMed

Affiliation: Szent István University, Department of Zoology and Animal Ecology, 2100 Gödöllő, Páter K. u. 1, Hungary. bakonyi.gabor@mkk.szie.hu.

ABSTRACT
The effect of long-term feeding on Bt-maize by collembolans in the laboratory is virtually unestablished. That is why the aim of the present study was to test whether the reproduction, fecal pellet production or food preference of the collembolan F. candida is affected when fed on Bt-maize for several consecutive generations. The collembolans were fed with Bt-maize for 0, 6, 16 and 22 months and the number of eggs and fecal pellets were determined. The experiment was repeated seven months later with the same populations. Food preference tests were additionally performed. Significant differences were found in food consumption, egg production and food preference between populations in some cases, but no time-response effect was observed. In conclusion, several generations feeding of F. candida on Cry1Ab toxin containing Bt-maize seems not to be harmful to this collembolan species.

No MeSH data available.


Related in: MedlinePlus

Average number of fecal pellets per individuals (±SD) in F. candida populations fed continuously on Bt-maize for various numbers of months. Grey bars represent initial exposure (first set of experiments). White bars represent repeated exposure (second set of experiments). Different lower case letters indicate significant differences at p < 0.05. Bold lower case letters refers to grey bars, others to white ones. Number of months at the initial and repeated (in parenthesis) exposure are indicated on the x-axis.
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f2-insects-02-00243: Average number of fecal pellets per individuals (±SD) in F. candida populations fed continuously on Bt-maize for various numbers of months. Grey bars represent initial exposure (first set of experiments). White bars represent repeated exposure (second set of experiments). Different lower case letters indicate significant differences at p < 0.05. Bold lower case letters refers to grey bars, others to white ones. Number of months at the initial and repeated (in parenthesis) exposure are indicated on the x-axis.

Mentions: In the first set of reproduction and fecal pellet production experiments significant differences were found in egg production between some populations. Population A and D produced significantly more eggs than population B and C (Figure 1). The tendency was similar in the second set of experiments, seven months later with the exception that the difference was statistically not significant between population B and D (Figure 1). Similar figure was observed in the case of fecal pellet production. In the first set of experiments population D produced more eggs than population B and C. Population A produced numerically more fecal pellets than population B and C, but the difference was not significant (Figure 2). In the second set of experiments population D produced more fecal pellets than population B and C (Figure 2), however, the difference was not significant between population B and D. No consistent effect of the feeding history on the reproduction and fecal pellet production was observed. Neither egg nor fecal pellet production showed a trend of increase or decrease depending on how long collembolans were fed on Bt-maize before the experiments. Those populations produced most eggs and fecal pellets which were fed on Bt-maize for the shortest (population A) and the longest (population D) duration.


Effects of Consumption of Bt-maize (MON 810) on the Collembolan Folsomia candida, Over Multiple Generations: A Laboratory Study.

Bakonyi G, Dolezsai A, Mátrai N, Székács A - Insects (2011)

Average number of fecal pellets per individuals (±SD) in F. candida populations fed continuously on Bt-maize for various numbers of months. Grey bars represent initial exposure (first set of experiments). White bars represent repeated exposure (second set of experiments). Different lower case letters indicate significant differences at p < 0.05. Bold lower case letters refers to grey bars, others to white ones. Number of months at the initial and repeated (in parenthesis) exposure are indicated on the x-axis.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4553462&req=5

f2-insects-02-00243: Average number of fecal pellets per individuals (±SD) in F. candida populations fed continuously on Bt-maize for various numbers of months. Grey bars represent initial exposure (first set of experiments). White bars represent repeated exposure (second set of experiments). Different lower case letters indicate significant differences at p < 0.05. Bold lower case letters refers to grey bars, others to white ones. Number of months at the initial and repeated (in parenthesis) exposure are indicated on the x-axis.
Mentions: In the first set of reproduction and fecal pellet production experiments significant differences were found in egg production between some populations. Population A and D produced significantly more eggs than population B and C (Figure 1). The tendency was similar in the second set of experiments, seven months later with the exception that the difference was statistically not significant between population B and D (Figure 1). Similar figure was observed in the case of fecal pellet production. In the first set of experiments population D produced more eggs than population B and C. Population A produced numerically more fecal pellets than population B and C, but the difference was not significant (Figure 2). In the second set of experiments population D produced more fecal pellets than population B and C (Figure 2), however, the difference was not significant between population B and D. No consistent effect of the feeding history on the reproduction and fecal pellet production was observed. Neither egg nor fecal pellet production showed a trend of increase or decrease depending on how long collembolans were fed on Bt-maize before the experiments. Those populations produced most eggs and fecal pellets which were fed on Bt-maize for the shortest (population A) and the longest (population D) duration.

Bottom Line: The effect of long-term feeding on Bt-maize by collembolans in the laboratory is virtually unestablished.Significant differences were found in food consumption, egg production and food preference between populations in some cases, but no time-response effect was observed.In conclusion, several generations feeding of F. candida on Cry1Ab toxin containing Bt-maize seems not to be harmful to this collembolan species.

View Article: PubMed Central - PubMed

Affiliation: Szent István University, Department of Zoology and Animal Ecology, 2100 Gödöllő, Páter K. u. 1, Hungary. bakonyi.gabor@mkk.szie.hu.

ABSTRACT
The effect of long-term feeding on Bt-maize by collembolans in the laboratory is virtually unestablished. That is why the aim of the present study was to test whether the reproduction, fecal pellet production or food preference of the collembolan F. candida is affected when fed on Bt-maize for several consecutive generations. The collembolans were fed with Bt-maize for 0, 6, 16 and 22 months and the number of eggs and fecal pellets were determined. The experiment was repeated seven months later with the same populations. Food preference tests were additionally performed. Significant differences were found in food consumption, egg production and food preference between populations in some cases, but no time-response effect was observed. In conclusion, several generations feeding of F. candida on Cry1Ab toxin containing Bt-maize seems not to be harmful to this collembolan species.

No MeSH data available.


Related in: MedlinePlus