4 Works

Data from: A cryptic Allee effect: spatial contexts mask an existing fitness–density relationship

Akira Terui, Yusuke Miyazaki, Akira Yoshioka & Shin-Ichiro S. Matsuzaki
Current theories predict that Allee effects should be widespread in nature, but there is little consistency in empirical findings. We hypothesized that this gap can arise from ignoring spatial contexts (i.e. spatial scale and heterogeneity) that potentially mask an existing fitness–density relationship: a ‘cryptic’ Allee effect. To test this hypothesis, we analysed how spatial contexts interacted with conspecific density to influence the fertilization rate of the freshwater mussel Margaritifera laevis. This sessile organism has a...

Data from: Asymmetric dispersal structures a riverine metapopulation of the freshwater pearl mussel Margaritifera laevis

Akira Terui, Yusuke Miyazaki, Akira Yoshioka, Kenzo Kaifu, Shin-Ichiro S. Matsuzaki & Izumi Washitani
Unidirectional water flow results in the downstream-biased, asymmetric dispersal of many riverine organisms. However, little is known of how asymmetric dispersal influences riverine population structure and dynamics, limiting our ability to properly manage riverine organisms. A metapopulation of the freshwater pearl mussel Margaritifera laevis may be sensitive to river currents because mussels are repeatedly exposed to downstream drift during floods—a parasitic life stage is the only, limited period (~40 days) during which larvae (glochidia) can...

Data from: Global stability of obligate mutualistm in community modules with facultative mutualists

Gaku Takimoto & Kenta Suzuki
Mutualism is a fundamental building block of ecological communities and an important driver of biotic evolution. Classic theory suggests that a pairwise two-species obligate mutualism is fragile, with a large perturbation potentially driving both mutualist populations into extinction. In nature, however, there are many cases of pairwise obligate mutualism. Such pairwise obligate mutualisms are occasionally associated with additional interactions with facultative mutualists. Here, we use a mathematical model to show that when a two-species obligate...

Data from: Mixed mating system are regulated by fecundity in Shorea curtisii (Dipterocarpaceae) as revealed by comparison under different pollen limited conditions

Naoki Tani, Yoshihiko Tsumura, Keita Fukasawa, Tomoyuki Kado, Yuriko Taguchi, Soon Leong Lee, Chai Ting Lee, Norwati Muhammad, Kaoru Niiyama, Tatsuya Otani, Tsutomu Yagihashi, Hiroyuki Tanouchi, Azizi Ripin & Abdul Rahman Kassim
The maintenance of mixed mating was studied in Shorea curtisii, a dominant and widely distributed dipterocarp species in Southeast Asia. Paternity and hierarchical Bayesian analyses were used to estimate the parameters of pollen dispersal kernel, male fecundity and self-pollen affinity. We hypothesized that partial self incompatibility and/or inbreeding depression reduce the number of selfed seeds if the mother trees receive sufficient pollen, whereas reproductive assurance increases the numbers of selfed seeds under low amounts of...

Registration Year

  • 2015

Resource Types

  • Dataset


  • National Institute for Environmental Studies
  • Kanagawa Prefectural Museum of Natural History
  • Hokkaido University
  • University of Tokyo
  • Japan International Research Center for Agricultural Sciences
  • Forest Research Institute Malaysia
  • Chuo University
  • Forestry and Forest Products Research Institute
  • Graduate University For Advanced Studies