Termination of Diapause in the Boll Weevil (Coleoptera: Curculionidae)

Spurgeon, D. W.; Suh, Charles P.-C.

doi:10.1093/jee/toy392

Cited by 7 publications

(15 citation statements)

References 37 publications

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“…Besides, because there were weak signs of oogenesis in those insects kept under laboratory conditions, compared to those naturally feeding in the field, the development of oocytes likely requires specific stimuli, such as feeding on the host plant tissues, such as the flower and foliar tissues or even the nectar. In fact, in many diapausing species, specific food intake is necessary to initiate ovary development before egg-laying (see Spurgeon et al, 2003;Bel-Venner et al, 2009;Spurgeon & Suh, 2019). We suggest that this may be the case of H. abdominalis whose adults arrive on plants at the beginning of the flowering season, where they remain feeding on the flower tissues, young leaves, and fruits until egg-laying.…”

Section: Discussionmentioning

confidence: 91%

The specialist of a specialist: the natural history of the predispersal seed predator weevil Hemicolpus abdominalis (Coleoptera: Curculionidae)

Sanz‐Veiga

Polizello

Silva

et al. 2021

Ecological Entomology

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1. The reproduction of specialised endophagous insects relies on a fine temporal synchronization between the insect and its host plant phenology.2. Since the spatial distribution and local prevalence of specialised insects depend on both environmental conditions and biotic interactions, in this study, we assessed whether the life cycle of the predispersal seed feeding weevil, Hemicolpus abdominalis (Curculionidae), is synchronised with the reproductive phenology of its host plant, Tocoyena formosa (Rubiaceae) in the Brazilian Cerrado. Following an ecological niche modelling approach, we also tested whether the predicted distribution of this specialised weevil matches that of its host plant.3. We observed a tight synchronization between the weevil reproduction and its host plant reproductive phenology. After emergence from the fruits, adult weevils enter in reproductive diapause, with reproductive development resuming in the next reproductive season, which indicates the univoltism of this species.4. There was a high spatial congruence in the distribution of H. abdominalis and its host plant. Since the reproduction of H. abdominalis is synchronised with the host plant phenology, temporal mismatches between the weevil life cycle, and plant reproduction may affect the long-term population prevalence of the insect.5. The life cycle of the predispersal seed feeding weevil, H. abdominalis, depends on a close match with the host plant reproductive phenology, whose fruit production is entirely dependent on long-tongued hawkmoth pollinators. Hence, we highlight the importance of both biotic and abiotic conditions in shaping the distribution range of a specialised endophagous insect.

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Section: Discussionmentioning

confidence: 91%

The specialist of a specialist: the natural history of the predispersal seed predator weevil Hemicolpus abdominalis (Coleoptera: Curculionidae)

Sanz‐Veiga

Polizello

Silva

et al. 2021

Ecological Entomology

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Section: Introductionmentioning

confidence: 99%

“…The nature of the reproductive dormancy in tropical and subtropical regions has been a matter of debate [ 9 , 14 , 18 , 19 ]. The reasoning that dormancy is quiescent [ 18 ] is questionable, because the authors did not examine the termination of dormancy [ 19 ]. On the other hand, the definition of this reproductive dormancy was based on the observation of fat bodies through the boll weevil abdominal cuticle [ 14 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…The reasoning that dormancy is quiescent [ 18 ] is questionable, because the authors did not examine the termination of dormancy [ 19 ]. On the other hand, the definition of this reproductive dormancy was based on the observation of fat bodies through the boll weevil abdominal cuticle [ 14 , 19 ]. Furthermore, the diapause was not examined per se [ 9 ], and because the insects were field- or trap-collected, neither Guerra et al [ 18 ] nor Greenberg et al [ 9 ] knew the history of the insects examined [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the definition of this reproductive dormancy was based on the observation of fat bodies through the boll weevil abdominal cuticle [ 14 , 19 ]. Furthermore, the diapause was not examined per se [ 9 ], and because the insects were field- or trap-collected, neither Guerra et al [ 18 ] nor Greenberg et al [ 9 ] knew the history of the insects examined [ 19 ]. The boll weevil dormancy that was defined is a diapause of variable intensity rather than quiescence [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

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Morphology and Morphometry of the Reproductive Tract of the Cotton Boll Weevil after Prolonged Feeding on Alternative Diets

Carvalho

Martins

SILVA

et al. 2023

Insects

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Anthonomus grandis Boheman (Coleoptera: Curculionidae) survives on alternative diets; however, this induces reproductive diapause. The objective was to evaluate the morphology and morphometry of the reproductive tract of this weevil after feeding on alternative diets. The experimental design was completely randomized with 160 replications and treatments arranged in a factorial design 3 × 3, represented by A. grandis adults fed on 3 food types (fragments of banana (T1) or orange (T2) endocarp, or with cotton squares of cultivar BRS 286 (T3, control)) and three evaluation periods (30, 60, and 90 days) and after each of these periods they were fed with cotton squares for 10 days. The reproductive tract of 100% of A. grandis females fed banana endocarp, orange endocarp, and cotton squares for 30 and 60 days and then cotton squares were morphologically adequate for reproduction, and after 90 days, only 50% of those fed cotton squares were in this condition. The length of the ovarioles and the width of the mature oocyte were greater for A. grandis fed on cotton squares and smaller in those with banana and orange endocarps. Histological sections reveal that male testes even with strong degenerative signals are already producing spermatozoa. On the other hand, females displayed ovaries with nurse cells in the tropharium and some maturing oocytes in the vitellarium. The body length was longer and the testis area and diameter smaller in males fed on cotton squares than in those with banana and orange endocarp. Anthonomus grandis females fed for ≥90 days with alternative food sources do not recover the functionality of their reproductive tract, even after consuming, for 10 days, a diet that favors reproduction. On the other hand, the males remain with their reproductive organs functional with this condition.

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Aseasonal, undirected migration in insects: 'Invisible' but common

Sappington

2024

iScience

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Termination of Diapause in the Boll Weevil (Coleoptera: Curculionidae)

Cited by 7 publications

References 37 publications

The specialist of a specialist: the natural history of the predispersal seed predator weevil Hemicolpus abdominalis (Coleoptera: Curculionidae)

The specialist of a specialist: the natural history of the predispersal seed predator weevil Hemicolpus abdominalis (Coleoptera: Curculionidae)

Morphology and Morphometry of the Reproductive Tract of the Cotton Boll Weevil after Prolonged Feeding on Alternative Diets

Aseasonal, undirected migration in insects: 'Invisible' but common

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