Mikio Watanabe's research while affiliated with Aichi University of Education and other places
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Publications (8)
Certain plants exhibit rapid movement in response to mechanical stimulation; however, the ecological functions of this behaviour are largely unknown. Here, we show that the rapid flower closure of Drosera tokaiensis (Droseraceae) in response to mechanical stimulation functions as a physical defence against a specialist herbivore Buckleria paludum (...
In response to unfavorable environmental conditions, some Drosera species in the northern hemisphere do not open their flowers but form bud-like flowers. The bud-like flowers exhibit pseudo-cleistogamous behavior and produce similar numbers of seeds as open flowers. However, it is not clear how common this type of reproduction is in the genus Drose...
Glandular trichomes deter herbivores and benefit the plants that possess them. However, the effects on neighboring plants have not been explored. We hypothesized that Parentucellia viscosa with glandular trichomes may capture her-bivores and reduce their densities to cause associational resistance for neighboring Trifolium repens. Parentucellia vis...
Plants are sessile organisms and are under serious threat of herbivory. In response to herbivory, plants have evolved physical, chemical, and/or biological defenses to protect themselves from herbivores. Plants are not only protected by their own defenses, but also by the existence of neighboring plants, the so called “associational resistance” (Ta...
Some predatory animals, represented by large carnivores, forage in groups and benefit from this behavior. We tested the hypothesis that carnivorous plants also benefit from group foraging to improve the efficiency of trapping large prey using Drosera makinoi (Droseraceae). As a result of our field observations, it was found that larger neighboring...
Carnivorous plants are major predators of small insects in some habitats. Because traps of carnivorous plants are serious threats for small insects, it is probable to evolve a mechanism to sense a cue of carnivorous plants and avoid being trapped. However, such a sensing behavior of small insects has never been described. Here we report that a hove...
Some plants rapidly close their leaves in response to mechanical stimulation, but no case is known in which mechanical stimulation causes rapid petal closure. In this study, we found that Drosera tokaiensis closes petals within 2–10 min after experimental stimulation of the calyx, closed flowers or scapes with a pair of tweezers. Although petal clo...
Carnivorous plants use insects not only as prey, but also as pollinators. Whereas outcrossing carnivorous plants are known to avoid trapping pollinators, selfing carnivorous plants may capture the pollinators as prey. Here, we provide evidence that two selfing carnivorous plant species with short flower-trap separation, Drosera makinoi (white-color...
Citations
... Associational susceptibility and resistance can be through indirect abiotic mechanisms, such as when neighboring plants alter resource availability to focal plants. Associational effects can also be more direct, through effects on herbivore and predator behavior or survival, through neighboring plants affecting herbivore movement to focal plants, or through the effects of neighbors on focal plant traits (e.g., Tagawa & Watanabe, 2021). The effects of neighboring plants may be at least partially dependent on climate (e.g., mean annual temperature; Poeydebat et al., 2020), as well as local resources and past ecological histories (Rotter & Rebertus, 2015). ...
... Since this Drosera species had by far the largest trapping leaves among the three species studied with an average leaf length of 10.4 ± 0.6 cm (Suppl Appendix S7), and exhibits the largest leaves in D. section Arachnopus 32 , this may represent an example of large prey items being more easily captured by species with larger trapping leaves 33 . Additionally, the sampled Figure S1), probably attracting larger prey and enabling capture of larger prey items by "collective" trapping 46 . Alternatively, Fleischmann 30 suggested that captured Lepidoptera themselves could attract further individuals of the same species by pheromone release, potentially explaining the very high numbers of this insect order observed in D. finlaysoniana. ...
... Katsuyoshi Ichige (pers. comm.) says that in Japan the name S. menthastri is used for specimens belonging to S. indiana (as an example, see Tagawa et al. 2018); thus, it would not be a surprise that all or some of the specimens listed under S. menthastri in Choi et al. (2018c) Identification.- Mutin and Barkalov (1999). ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/993159618260992-1613799113367_Q64/Tetsukazu-Yahara-2.jpg)
... The carnivorous plant Drosera tokaiensis (Droseraceae) is unique in that it closes flowers rapidly in response to mechanical stimulation [4]. D. tokaiensis forms a long flower stalk (14.8 ± 5.59 cm, mean ± s.d., based on plants in their natural habitat, Okayama Prefecture, Japan) with approximately 1-15 buds. ...
... Some Drosera flowers have characteristics that are considered adaptive for entomophily (Witt et al., 2020). Various insect species, including flower flies (El-Sayed et al., 2016;Murza et al., 2006;Tagawa et al., 2018), bees (Wilson, 1995), and beetles (Anderson, 2010), have been recorded as effective pollinators, facilitating out-crossing. On the other hand, many Drosera are self-compatible to make seeds by autogamy and do not depend on pollinators for reproduction (Murza & Davis, 2003;Pietropaolo & Pietropaolo, 1986;Sciligo, 2009). ...
