Abundance and survival of a seed‐infesting weevil, <i>Pseudanthonomus hamamelidis</i> (Coleoptera: Curculionidae), on its variable‐fruiting host plant, witch‐hazel (<i>Hamamelis virginiana</i>)

Steven, Diane De

doi:10.1111/j.1365-2311.1981.tb00629.x

Cited by 18 publications

(9 citation statements)

References 17 publications

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“…First, the number of seeds consumed will not accurately predict the impact of seed predators on seedling production if additional limitations play a prominent role during germination or seedling emergence. Though contrasting with studies of insect predispersal seed predation (e.g., De Steven 1981, this result is consistent with most studies of postdispersal predation by vertebrates. Second, if predators fail to lower seed densities below the level at which density-dependent seedling mortality operates, predation may affect only the timing of mortality, not the ultimate population size (Harper 1977).…”

Section: Seed Predationsupporting

confidence: 63%

Annual Variation in Seedfall, Postdispersal Predation, and Recruitment of a Neotropical Tree

Schupp¹

1990

Ecology

211

138

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Knowledge of the dynamics of seed production and seedling recruitment of individual tree species is crucial for a complete understanding of tropical forest dynamics, yet multiyear studies on the seed and young seedling stages of tropical trees are virtually nonexistent. In a 4-yr study of the understory tree Faramea occidentalis on Barro Colorado Island, Panama, I quantified natural levels of viable seedfall, seedling emergence, and seedling establishment, and experimentally estimated postdispersal seed predation.The levels of viable seedfall, seed predation, seedling emergence, early seedling survival, and seedling recruitment all differed significantly among years. The proportion of fallen seeds destroyed by predators before germination was not related to the quantity of F. occidentalis seedfall. Within a year, however, F. occidentalis seed predation appeared to be influenced by community-wide seedfall, with high predation rates during times of low seed abundance and very low predation during the late dry season peak in seedfall by the community. Most of the annual variation in recruitment can be explained by the combination of seedfall and seed predation; in 3 of the 4 yr seedling emergence could be predicted from a knowledge of viable seedfall and the probability of a seed surviving until the peak of germination. The 4th yr, however, demonstrated that environmental conditions provide a sporadic, though important, limitation to recruitment. In comparison to many tree species, early seedling survival was relatively high, as was the ratio of seedlings recruited per seed falling. The highly successful recruitment of F. occidentalis is associated with a high population density of both saplings and adults in the study area.

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Section: Seed Predationsupporting

confidence: 63%

Annual Variation in Seedfall, Postdispersal Predation, and Recruitment of a Neotropical Tree

Schupp¹

1990

Ecology

211

138

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“…Adults emerging from hibernation are active from mid-May to early July, and those from the current-year generation emerge from mid-August to early September and then hibernate until the following spring (DeSteven 1981). …”

Section: Resultsmentioning

confidence: 99%

New Curculionoidea (Coleoptera) records for Quebec, Canada

Tonnancour¹,

Anderson²,

Bouchard³

et al. 2017

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The following species of Curculionoidea are newly recorded from the Canadian province of Quebec: Coelocephalapion emaciipes (Fall, 1898); Ischnopterapion virens (Herbst, 1797); Omphalapion hookerorum (Kirby, 1808); Perapion punctinasum (J.B. Smith, 1884) (all Brentidae); Anthonomus robustulus LeConte, 1876; Pseudanthonomus helvolus (Boheman, 1843); Bagous magister LeConte, 1876; Bagous tanneri O’Brien, 1979; Buchananius striatus (LeConte, 1876); Ceutorhynchus bolteri Dietz, 1896; Ceutorhynchus pallidactylus (Marsham, 1802); Ceutorhynchus pauxillus Dietz, 1896; Conotrachelus buchanani Schoof, 1942; Conotrachelus pusillus LeConte, 1878; Conotrachelus recessus (Casey, 1910); Curculio rubidus (Gyllenhal, 1835); Cylindrocopturus longulus (LeConte, 1876); Hadroplontus litura (Fabricius, 1775); Hypera rumicis (Linnaeus, 1758); Lixus terminalis LeConte, 1876; Myosides seriehispidus Roelofs, 1873; Phloeotribus dentifrons (Blackman, 1921); Plocamus echidna (LeConte, 1876); Scolytus muticus Say, 1824; Sirocalodes sericans (LeConte, 1876); Smicronyx sculpticollis Casey, 1892 (all Curculionidae). Among these, Buchananius striatus, Conotrachelus buchanani, Conotrachelus pusillus, and Curculio rubidus (all Curculionidae) are also recorded from Canada for the first time. The latter is also newly reported from Ontario. Collecting data are provided for Lixus punctinasus LeConte, 1876, previously reported to occur in Canada without any further information, and for Choragus sayi LeConte, 1876 (Anthribidae) and Rhyssomatus aequalis Horn, 1873 (Curculionidae), both previously recorded from Quebec, also without further details.

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“…Braconid wasps (Hym., Braconidae) and dipteran mainly Tachinidae, cause mortality of acorn weevil larvae when they are exposed for a brief period during burrowing into the soil for pupation or in the prepupal stage if the larvae d o not leave the fruit (BLATCHLEY and LENG 1916;BROOKS and COTTON 1929;CHELLMAN 1954;BREZNER 1960;GIBSON 1969GIBSON , 1982STEVEN 1981). They however, further reported that mortality caused by parasitoids did not affect acorn infestation.…”

Section: Discussionmentioning

confidence: 99%

Aspects of the biology and control of three species of acorn weevils infesting oak acorns in Kumaun Himalaya

Kaushal

Pant

Kalia

et al. 1993

J Applied Entomology

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Biology and ecology of three acorn weevils: Dicranognathus nebulosus Redt. (Col., Attelabidae), Sitophilus glandium (Mshl.) (Col., Curculionidae) and Curculio sikkimensis (Hell.) (Col., Curculionidae), which infest acorns of Quercus leucotrochophora A. Camus and Q. floribunda Lindle was studied in the laboratory and in the field. Adults of D. nebulosus and C. sikkimensis laid one egg per infested acorn, and S. glandium laid 0 to 8 (means 5.2 ± 0.47) eggs in an infested acorn of Q. leucotrichophora. Only a single larva of D. nebulosus and C. sikkimensis developed per acorn, and 1 to 5 (mean 3.8 ± 0.3) larvae of S. glandum developed per acorn through the last instar. Larvae of D. nebulosus and S. glandium completed their development in the infested acorn, and C. sikkimensis emerged from the acorn through the last instar and completed its development in the soil. Good synchronization was observed in the life cycle of acorn weevils and phenology of Q. leucotrichophora. An average of 88.7% of acorns were infested by the acorn weevils. Injury to live acorns by weevil larvae reduced germination and seedling growth. Weevil larvae could be controlled by hydrothermal treatment (20 min at 45 °C) of infested acorns in the germination experiments. Zusammenfassung Zur Biologie und Bekämpfung von drei Käferarten in Kumaun Himalaya, Indien, die Eicheln befallen Im Labor und Freiland wurden die Biologie und Ökologie der 3 Käferarten Dicranognathus nebulosus Redt. (Col., Attelabidae), Sitophilus glandium (Mshl.) (Col., Curculionidae) und Curculio sikkimensis (Hell.) (Col., Curculionidae), welche die Eicheln von Quercus leucotrochophora und C. floribunda befallen, untersucht. Die Weibchen von D. nebulosus und C. sikkimensis legten ein Ei pro Eichel ab, während S. glandium 0 bis 8 Eier (i.M. 5) pro Eichel von Q. leucotrochophora ablegte. Somit entwickelten sich von D. nebulosus und C. sikkimensis in einer Eichel nur je 1 Larve. Von S. glandium dagegen gelangten bis zu 5 (i. M. 3) Larven in einer Eichel zum letzten Larvenstadium. Während bei D. nebulosus und S. glandium die Larven ihre Entwicklung in der Eichel vollendeten, verließen die Altlarven von C. sikkimensis die Eichel und beendeten ihre Entwicklung im Boden. Es bestand eine gute Synchronisation zwischen der Phänologie von Quercus leucotrichophora und dem Lebenszyklus der Eichelkäfer. Die 3 Käferarten befielen im Untersuchungszeitraum i. M. 88,7 % der Eicheln von Q. leucotrichophora. Der Befall lebender Eicheln durch die Käferlarven führte zur Verminderung der Keimung und des Sämlingswachstums. Die Käferlarven konnten mit Hilfe einer Hitzebehandlung (20 min bei 45 °C) der Eicheln erfolgreich, d.h. im Sinne der Erhaltung der Keimkraft, bekämpft werden.

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Abundance and survival of a seed‐infesting weevil, Pseudanthonomus hamamelidis (Coleoptera: Curculionidae), on its variable‐fruiting host plant, witch‐hazel (Hamamelis virginiana)

Cited by 18 publications

References 17 publications

Annual Variation in Seedfall, Postdispersal Predation, and Recruitment of a Neotropical Tree

Annual Variation in Seedfall, Postdispersal Predation, and Recruitment of a Neotropical Tree

New Curculionoidea (Coleoptera) records for Quebec, Canada

Aspects of the biology and control of three species of acorn weevils infesting oak acorns in Kumaun Himalaya

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