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Persistent pods of the tree Acacia caven: a natural refuge for diverse insects including Bruchid beetles and the parasitoids Trichogrammatidae, Pteromalidae and Eulophidae.

Rojas-Rousse D - J. Insect Sci. (2006)

Bottom Line: The persistent pods of the tree, Acacia caven that do not fall from the tree provide opportunities for the appearance of a diverse group of insects the following season.These persistent pods are a natural refuge for insect species, namely two bruchid beetles (Pseudopachymeria spinipes, Stator furcatus), one scolytidae (Dendroctonus sp), lepidopterous larvae, ant colonies (Camponotus sp), one species of oophagous parasitoid (Uscana espinae group senex), the gregarious larval-pupae parasitoid Monoksa dorsiplana (Pteromalidae) and two species of Horismenus spp. (Eulophidae).The patriline of M. dorsiplana is frequently formed by 1 son + 7 daughters.

View Article: PubMed Central - PubMed

Affiliation: Institut de Recherche sur la Biologie de l'Insecte, UMR CNRS 6035, Faculté des Sciences, F-37200 Tours, France. rousse@univ-tours.fr

ABSTRACT
The persistent pods of the tree, Acacia caven that do not fall from the tree provide opportunities for the appearance of a diverse group of insects the following season. Such pods collected during the spring of 1999 in Chile were indehiscent with highly sclerified pod walls. In contrast, persistent pods collected in Uruguay after a wet winter and spring (2002) were partially dehiscent, inducing the deterioration of the woody pods, and consequently exposing the seeds. These persistent pods are a natural refuge for insect species, namely two bruchid beetles (Pseudopachymeria spinipes, Stator furcatus), one scolytidae (Dendroctonus sp), lepidopterous larvae, ant colonies (Camponotus sp), one species of oophagous parasitoid (Uscana espinae group senex), the gregarious larval-pupae parasitoid Monoksa dorsiplana (Pteromalidae) and two species of Horismenus spp. (Eulophidae). The patriline of M. dorsiplana is frequently formed by 1 son + 7 daughters.

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Emergence holes pierced per Acacia caven seed by Stator furcatus. From one to three S.furcatus could develop per seed.
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i1536-2442-6-8-1-f04: Emergence holes pierced per Acacia caven seed by Stator furcatus. From one to three S.furcatus could develop per seed.

Mentions: Some pods (24%: 12/50) were contaminated by a second bruchid species: Stator furcatus, which is smaller than P. spinipes and lays 1 to 5 eggs on the integument of the seeds (Figure 3). In contrast to P. spinipes, 1 to 3 S. furcatus emergence holes were observed in seeds, indicating that more than one S. furcatus adult could develop per seed (Figure 4). P. spinipes egg-laying was also observed in the split open, partially dehiscent pods. The eggs were aggregated on the pod integument. Thus, the total level of bruchid attack was the sum of the emergence holes of the two bruchids (S. furcatus + P. spinipes) and those of parasitoids (smaller than those of bruchids). The presence of parasitoid emergence holes indicated the presence of a bruchid host that had been parasitized.


Persistent pods of the tree Acacia caven: a natural refuge for diverse insects including Bruchid beetles and the parasitoids Trichogrammatidae, Pteromalidae and Eulophidae.

Rojas-Rousse D - J. Insect Sci. (2006)

Emergence holes pierced per Acacia caven seed by Stator furcatus. From one to three S.furcatus could develop per seed.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2990294&req=5

i1536-2442-6-8-1-f04: Emergence holes pierced per Acacia caven seed by Stator furcatus. From one to three S.furcatus could develop per seed.
Mentions: Some pods (24%: 12/50) were contaminated by a second bruchid species: Stator furcatus, which is smaller than P. spinipes and lays 1 to 5 eggs on the integument of the seeds (Figure 3). In contrast to P. spinipes, 1 to 3 S. furcatus emergence holes were observed in seeds, indicating that more than one S. furcatus adult could develop per seed (Figure 4). P. spinipes egg-laying was also observed in the split open, partially dehiscent pods. The eggs were aggregated on the pod integument. Thus, the total level of bruchid attack was the sum of the emergence holes of the two bruchids (S. furcatus + P. spinipes) and those of parasitoids (smaller than those of bruchids). The presence of parasitoid emergence holes indicated the presence of a bruchid host that had been parasitized.

Bottom Line: The persistent pods of the tree, Acacia caven that do not fall from the tree provide opportunities for the appearance of a diverse group of insects the following season.These persistent pods are a natural refuge for insect species, namely two bruchid beetles (Pseudopachymeria spinipes, Stator furcatus), one scolytidae (Dendroctonus sp), lepidopterous larvae, ant colonies (Camponotus sp), one species of oophagous parasitoid (Uscana espinae group senex), the gregarious larval-pupae parasitoid Monoksa dorsiplana (Pteromalidae) and two species of Horismenus spp. (Eulophidae).The patriline of M. dorsiplana is frequently formed by 1 son + 7 daughters.

View Article: PubMed Central - PubMed

Affiliation: Institut de Recherche sur la Biologie de l'Insecte, UMR CNRS 6035, Faculté des Sciences, F-37200 Tours, France. rousse@univ-tours.fr

ABSTRACT
The persistent pods of the tree, Acacia caven that do not fall from the tree provide opportunities for the appearance of a diverse group of insects the following season. Such pods collected during the spring of 1999 in Chile were indehiscent with highly sclerified pod walls. In contrast, persistent pods collected in Uruguay after a wet winter and spring (2002) were partially dehiscent, inducing the deterioration of the woody pods, and consequently exposing the seeds. These persistent pods are a natural refuge for insect species, namely two bruchid beetles (Pseudopachymeria spinipes, Stator furcatus), one scolytidae (Dendroctonus sp), lepidopterous larvae, ant colonies (Camponotus sp), one species of oophagous parasitoid (Uscana espinae group senex), the gregarious larval-pupae parasitoid Monoksa dorsiplana (Pteromalidae) and two species of Horismenus spp. (Eulophidae). The patriline of M. dorsiplana is frequently formed by 1 son + 7 daughters.

Show MeSH