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Competitive interactions between parasitoids provide new insight into host suppression.

Xu HY, Yang NW, Wan FH - PLoS ONE (2013)

Bottom Line: Understanding the dynamics of potential inter- and intraspecific competition in parasitoid communities is crucial in the screening of efficient parasitoid species and for utilization of the best parasitoid species combinations.Results showed that (1) both parasitoid species negatively affect the progeny production of the other under both rich and limited host resource conditions; (2) both parasitoid species interfered intraspecifically on conspecific parasitized hosts when the available hosts are scarce and; 3) the mortality of B. tabaci induced by parasitoids via parasitism, host-feeding or both parasitism and host-feeding together varied among treatments under different host resource conditions, but showed promise for optimizing control strategies.As a result of our current findings, we suggest a need to investigate the interactions between the two parasitoids on continuous generations.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, P. R. China.

ABSTRACT
Understanding the dynamics of potential inter- and intraspecific competition in parasitoid communities is crucial in the screening of efficient parasitoid species and for utilization of the best parasitoid species combinations. In this respect, the host-parasitoid systems, Bemisia tabaci and two parasitoids, Eretmocerus hayati (exotic) and Encarsia sophia (existing) were studied under laboratory conditions to investigate whether interference competition between the exotic and existing species occurs as well as the influence of potential interference competition on the suppression of the host B. tabaci. Studies on interspecific-, intraspecific- and self-interference competition in two parasitoid species were conducted under both rich and limited host resource conditions. Results showed that (1) both parasitoid species negatively affect the progeny production of the other under both rich and limited host resource conditions; (2) both parasitoid species interfered intraspecifically on conspecific parasitized hosts when the available hosts are scarce and; 3) the mortality of B. tabaci induced by parasitoids via parasitism, host-feeding or both parasitism and host-feeding together varied among treatments under different host resource conditions, but showed promise for optimizing control strategies. As a result of our current findings, we suggest a need to investigate the interactions between the two parasitoids on continuous generations.

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Related in: MedlinePlus

Interspecific interference competition effect on parasitoid progeny production.The blank, punctate and netted bars represent the number (mean ± SE) of En. sophia (A) or Er. hayati (B) progeny when introduced into the leaf cage alone (no subsequent parasitoid), first [introduced before a Er. hayati (A) or En. sophia (B) female] or second [introduced after a Er. hayati (A) or En. sophia (B) female], respectively. Note: * above each bar indicates the number of progeny that differed significantly between alone treatment and both the interference treatments, respectively (Mann-Whitney test, p < 0.05). Numbers in parentheses above bars indicate the sample sizes of treatments.
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pone-0082003-g001: Interspecific interference competition effect on parasitoid progeny production.The blank, punctate and netted bars represent the number (mean ± SE) of En. sophia (A) or Er. hayati (B) progeny when introduced into the leaf cage alone (no subsequent parasitoid), first [introduced before a Er. hayati (A) or En. sophia (B) female] or second [introduced after a Er. hayati (A) or En. sophia (B) female], respectively. Note: * above each bar indicates the number of progeny that differed significantly between alone treatment and both the interference treatments, respectively (Mann-Whitney test, p < 0.05). Numbers in parentheses above bars indicate the sample sizes of treatments.

Mentions: The subsequent introduction of heterospecific females reduced the progeny of first introduced females under both rich and limited host resource conditions in the interspecific interference treatment (Figure 1). As compared to the En. sophia alone treatment, the number of En. sophia progeny was reduced significantly (1.6 and 1.8 offspring) by the subsequent introduction of Er. hayati under both rich and limited resource conditions (Figure 1A; Mann-Whitney U = 209.00 and 86.50, P = 0.002 and < 0.0001, respectively). Likewise, the number of Er. hayati progeny was reduced significantly (3.9 and 4.2 offspring) by the subsequent introduction of En. sophia under both rich and limited resource conditions (Figure 1B; Mann-Whitney U = 199.00 and 53.50, P = 0.0004 and < 0.0001, respectively).


Competitive interactions between parasitoids provide new insight into host suppression.

Xu HY, Yang NW, Wan FH - PLoS ONE (2013)

Interspecific interference competition effect on parasitoid progeny production.The blank, punctate and netted bars represent the number (mean ± SE) of En. sophia (A) or Er. hayati (B) progeny when introduced into the leaf cage alone (no subsequent parasitoid), first [introduced before a Er. hayati (A) or En. sophia (B) female] or second [introduced after a Er. hayati (A) or En. sophia (B) female], respectively. Note: * above each bar indicates the number of progeny that differed significantly between alone treatment and both the interference treatments, respectively (Mann-Whitney test, p < 0.05). Numbers in parentheses above bars indicate the sample sizes of treatments.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3842984&req=5

pone-0082003-g001: Interspecific interference competition effect on parasitoid progeny production.The blank, punctate and netted bars represent the number (mean ± SE) of En. sophia (A) or Er. hayati (B) progeny when introduced into the leaf cage alone (no subsequent parasitoid), first [introduced before a Er. hayati (A) or En. sophia (B) female] or second [introduced after a Er. hayati (A) or En. sophia (B) female], respectively. Note: * above each bar indicates the number of progeny that differed significantly between alone treatment and both the interference treatments, respectively (Mann-Whitney test, p < 0.05). Numbers in parentheses above bars indicate the sample sizes of treatments.
Mentions: The subsequent introduction of heterospecific females reduced the progeny of first introduced females under both rich and limited host resource conditions in the interspecific interference treatment (Figure 1). As compared to the En. sophia alone treatment, the number of En. sophia progeny was reduced significantly (1.6 and 1.8 offspring) by the subsequent introduction of Er. hayati under both rich and limited resource conditions (Figure 1A; Mann-Whitney U = 209.00 and 86.50, P = 0.002 and < 0.0001, respectively). Likewise, the number of Er. hayati progeny was reduced significantly (3.9 and 4.2 offspring) by the subsequent introduction of En. sophia under both rich and limited resource conditions (Figure 1B; Mann-Whitney U = 199.00 and 53.50, P = 0.0004 and < 0.0001, respectively).

Bottom Line: Understanding the dynamics of potential inter- and intraspecific competition in parasitoid communities is crucial in the screening of efficient parasitoid species and for utilization of the best parasitoid species combinations.Results showed that (1) both parasitoid species negatively affect the progeny production of the other under both rich and limited host resource conditions; (2) both parasitoid species interfered intraspecifically on conspecific parasitized hosts when the available hosts are scarce and; 3) the mortality of B. tabaci induced by parasitoids via parasitism, host-feeding or both parasitism and host-feeding together varied among treatments under different host resource conditions, but showed promise for optimizing control strategies.As a result of our current findings, we suggest a need to investigate the interactions between the two parasitoids on continuous generations.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, P. R. China.

ABSTRACT
Understanding the dynamics of potential inter- and intraspecific competition in parasitoid communities is crucial in the screening of efficient parasitoid species and for utilization of the best parasitoid species combinations. In this respect, the host-parasitoid systems, Bemisia tabaci and two parasitoids, Eretmocerus hayati (exotic) and Encarsia sophia (existing) were studied under laboratory conditions to investigate whether interference competition between the exotic and existing species occurs as well as the influence of potential interference competition on the suppression of the host B. tabaci. Studies on interspecific-, intraspecific- and self-interference competition in two parasitoid species were conducted under both rich and limited host resource conditions. Results showed that (1) both parasitoid species negatively affect the progeny production of the other under both rich and limited host resource conditions; (2) both parasitoid species interfered intraspecifically on conspecific parasitized hosts when the available hosts are scarce and; 3) the mortality of B. tabaci induced by parasitoids via parasitism, host-feeding or both parasitism and host-feeding together varied among treatments under different host resource conditions, but showed promise for optimizing control strategies. As a result of our current findings, we suggest a need to investigate the interactions between the two parasitoids on continuous generations.

Show MeSH
Related in: MedlinePlus