TY - JOUR
T1 - Development of Mamestra brassicae and its solitary endoparasitoid Microplitis mediator on two populations of the invasive weed, Bunias orientalis
AU - Harvey, J.A.
AU - Gols, R.
N1 - Reporting year: 2011
Metis note: 4964; WAG; TE
PY - 2011
Y1 - 2011
N2 - The warty cabbage Bunias orientalis is an
invasive pest in much of central Europe, including much of
Germany since the 1980s, whereas in other countries, such
as The Netherlands, it is a less common exotic species.
Here, healthy larvae of Mamestra brassicae, which has
been found feeding on B. orientalis plants in Germany, and
larvae parasitized by one of its major larval endoparasitoids
Microplitis mediator, were reared on both herbivoreinduced
and noninduced leaves of B. orientalis originating
from single large populations growing in The Netherlands
and central Germany. Herbivore performance was less
negatively affected than parasitoid performance by differences
in plant quality. Development times in both
M. brassicae and Mi. mediator were shorter on Dutch than
German plants and also shorter on noninduced than
induced plants. Moreover, survival and body size of the
parasitoid was more strongly affected by plant population
and induction than survival of healthy M. brassicae.
Chemical analyses of defensive secondary metabolites
[glucosinolates (GS)] revealed that concentrations of the
major GS sinalbin were constitutively expressed in German
plants whereas they were induced in Dutch plants. However,
in separate feeding bioassays in which preference for
induced and noninduced leaves was compared separately,
L3 instars of M. brassicae preferred noninduced German
plants over Dutch plants but induced Dutch plants over
German plants, revealing that changes in primary metabolites
or an unidentified non-GS compound mediates population-
related differences in plant quality. The results
reveal asymmetric effects of plant quality in exotic plants
on organisms in the second and third trophic level.
AB - The warty cabbage Bunias orientalis is an
invasive pest in much of central Europe, including much of
Germany since the 1980s, whereas in other countries, such
as The Netherlands, it is a less common exotic species.
Here, healthy larvae of Mamestra brassicae, which has
been found feeding on B. orientalis plants in Germany, and
larvae parasitized by one of its major larval endoparasitoids
Microplitis mediator, were reared on both herbivoreinduced
and noninduced leaves of B. orientalis originating
from single large populations growing in The Netherlands
and central Germany. Herbivore performance was less
negatively affected than parasitoid performance by differences
in plant quality. Development times in both
M. brassicae and Mi. mediator were shorter on Dutch than
German plants and also shorter on noninduced than
induced plants. Moreover, survival and body size of the
parasitoid was more strongly affected by plant population
and induction than survival of healthy M. brassicae.
Chemical analyses of defensive secondary metabolites
[glucosinolates (GS)] revealed that concentrations of the
major GS sinalbin were constitutively expressed in German
plants whereas they were induced in Dutch plants. However,
in separate feeding bioassays in which preference for
induced and noninduced leaves was compared separately,
L3 instars of M. brassicae preferred noninduced German
plants over Dutch plants but induced Dutch plants over
German plants, revealing that changes in primary metabolites
or an unidentified non-GS compound mediates population-
related differences in plant quality. The results
reveal asymmetric effects of plant quality in exotic plants
on organisms in the second and third trophic level.
U2 - 10.1007/s10144-011-0267-4
DO - 10.1007/s10144-011-0267-4
M3 - Article
SN - 1438-3896
VL - 53
SP - 587
EP - 596
JO - Population Ecology
JF - Population Ecology
IS - 4
ER -