A preliminary investigation of pre-dispersal seed predation by Acanthoscelides schrankiae Horn (Coleoptera: Bruchidae) in Mimosa bimucronata (DC.) Kuntze trees.
نویسندگان
چکیده
This is the first record of Acanthoscelides schrankiae Horn. feeding in seeds of Mimosa bimucronata (DC.) Kuntze. We investigated the pattern of oviposition and seed exploitation by A. schrankiae, and the distribution of mature fruits and seed predation in the inflorescences. We also compared the percentage of predated seeds, the total dry weight of fruits and non-predated seeds, the percentage of aborted seeds, and the percentage of non-emergent insects, among different quadrants of the M. bimucronata canopy. To determine the occurring species, the emergence of bruchids and parasitoids was observed in the laboratory, resulting altogether, only in individuals of A. schrankiae and Horismenus sp. (Hymenoptera: Eulophidae) species, respectively. Mean number of fruits produced in the median region of inflorescence was significantly higher than in the inferior and superior regions, and the frequencies (observed and expected) of predated and non-predated seeds differed among the different regions of inflorescence. Females of A. schrankiae laid their eggs on fruits, and larvae, after emergence, perforated the exocarp to reach the seeds. Most fruits presented one to three eggs and only one bruchid larva was observed in each seed. The highest value of the rate "number of eggs/fruit" and the highest percentage of predated seeds were recorded in April. Dry weight of fruits (total) and seeds (non-predated), proportions of predated seeds, seed abortions, and non-emergent seed predators, were evenly distributed in the canopy.
منابع مشابه
Effects of the seed predator Acanthoscelides schrankiae on viability of its host plant Mimosa bimucronata.
Seeds of Mimosa bimucronata are heavily infested (pre-dispersal predation) by the bruchid beetle Acanthoscelides schrankiae in Brazil. In this study, firstly we set up experiments to assess seed germination under seven and six different light and temperature regimes, respectively, and then we evaluated the ability of seeds to germinate after predation. We tested the hypothesis that the non-pred...
متن کاملPre-dispersal seed predation by Bruchidius villosus (Coleoptera, Bruchidae) in Laburnum anagyroides (Fabaceae, Genisteae)
The pre-dispersal seed predator, Bruchidius villosus (Coleoptera, Bruchidae) destroyed ca. 8% of seeds of its major host-plant, Laburnum anagyroides (Fabaceae, Genisteae), a tree-like legume, in Hungary. However, almost 40% of the pods were infested by the beetle. Females did not show a resource concentration response: with increasing number of seeds per pod, the number of uninfested seeds also...
متن کاملA new species of Acanthoscelides Schilsky (Coleoptera: Bruchidae) from Mexico with some biological notes.
A new species of Acanthoscelides collected in Chiapas, Mexico is described and figured. Rhynchosia precatoria is cited as a new host plant record for A. dani sp.n and A. flavescens Fahraeus. The braconid Heterospilus prosopidis Viereck was found as parasitoid of both species of bruchids.
متن کاملBody Size Selection in Acanthoscelides alboscutellatus (Coleoptera: Bruchidae). I. Entrapment within the Fruit of Ludwigia alternifolia (Onagraceae)
Body Size Selection in Acanthoscelides alboscutellatus (Coleoptera: Bruchidae). I. Entrapment within the Fruit of Ludwigia alternifolia (Onagraceae) Author(s): James R. Ott and Margarita Lampo Source: Oecologia, Vol. 87, No. 4 (1991), pp. 522-527 Published by: Springer in cooperation with International Association for Ecology Stable URL: http://www.jstor.org/stable/4219729 . Accessed: 16/05/201...
متن کاملReproduction, pollination and seed predation of Senna multijuga (Fabaceae) in two protected areas in the Brazilian Atlantic forest.
One important subject is to determine the effectiveness of conservation areas, where different management categories are being applied, to maintain effective sexual reproduction in plants and their interactions with animal groups. To evaluate this issue, we compared the phenology, reproductive success, pollination and pre-dispersal seed predation of the legume tree Senna multijuga in two differ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Neotropical entomology
دوره 36 2 شماره
صفحات -
تاریخ انتشار 2007