9 Works

Different effects of mating group size as male and as female on sex allocation in a simultaneous hermaphrodite

Masami Tamechika, Kohei Matsuno, Satoshi Wada & Yoichi Yusa
Sex allocation theory predicts that the optimal sexual resource allocation of simultaneous hermaphrodites is affected by mating group size (MGS). Although the original concept assumes that the MGS does not differ between male and female functions, the MGS in the male function (MGSm; i.e., the number of sperm recipients the focal individual can deliver its sperm to plus one) and that in the female function (MGSf; the number of sperm donors plus one) do not...

Data from: Distribution and drift dispersal dynamics of a caddisfly grazer in response to resource abundance and its ontogeny

Izumi Katano, Hiromune Mitsuhashi, Hideyuki Doi, Yu Isobe & Tadashi Oishi
Stream grazers have a major impact on food web structure and the productivity of stream ecosystems; however, studies on the longitudinal (upstream versus downstream) and temporal changes in their drift dynamics and resulting distributions remain limited. Here, we investigated the longitudinal and temporal distributions and drift propensity of a trichopteran grazer, the caddisfly, Micrasema quadriloba, during its life cycle in a Japanese stream. The distribution of larvae significantly shifted downstream during the fifth instar larval...

Data from: Defensive chemicals of neighboring plants limit visits of herbivorous insects: associational resistance within a plant population

Takashi Y. Ida, Kojiro Takanashi, Momoka Tamura, Rika Ozawa, Yoshitaka Nakashima & Takayuki Ohgushi
Despite our understanding of chemical defenses and their consequences for plant performance and herbivores, we know little about whether defensive chemicals in plant tissues, such as alkaloids, and their spatial variation within a population play unappreciated and critical roles in plant-herbivore interactions. Neighboring plants can decrease or increase attractiveness of a plant to herbivores, an example of a neighborhood effect. Chemical defensive traits may contribute to neighborhood effects in plant-herbivore interactions. We examined the effects...

Intraspecific neighborhood effect: population-level consequence of aggregation of highly-defended plants

Takashi Ida, Momoka Tamura & Takayuki Ohgushi
There is increasing evidence that herbivore-plant interactions on a focal plant species are influenced by interspecific neighborhood effects via neighboring plants (i.e., an associational effect). However, intraspecific neighborhood effects imposed by plant traits have been less appreciated. Specifically, the significance of intraspecific neighborhood effects in population-level consequences of plants has been totally overlooked. Using two varieties of Nicotiana tabacum (high- and low-nicotine), we evaluated the neighborhood effects based on patch-level interactions in a split-plot 3...

Raw data used in A unified framework for herbivore-to-producer biomass ratio reveals the relative influence of four ecological factor

Jotaro Urabe, Takehiro Kazama, Masato Yamamichi, Kotaro Tokita, Xuwang Yin, Izumi Katano, Hideyuki Doi, Takehito YOSHIDA & Nelson Hairston
The biomass ratio of herbivores to primary producers reflects the structure of a community. Four primary factors have been proposed to affect this ratio, including production rate, defense traits and nutrient contents of producers, and predation by carnivores. However, identifying the joint effects of these factors across natural communities has been elusive, in part because of the lack of a framework for examining their effects simultaneously. Here, we develop a framework based on Lotka-Volterra equations...

Data from: Adaptive genetic variation mediates bottom-up and top-down control in an aquatic ecosystem

Seth M. Rudman, Mariano A. Rodriguez-Cabal, Adrian Stier, Takuya Sato, Julian Heavyside, Rana W. El-Sabaawi & Gregory M. Crutsinger
Research in eco-evolutionary dynamics and community genetics has demonstrated that variation within a species can have strong impacts on associated communities and ecosystem processes. Yet, these studies have centred around individual focal species and at single trophic levels, ignoring the role of phenotypic variation in multiple taxa within an ecosystem. Given the ubiquitous nature of local adaptation, and thus intraspecific variation, we sought to understand how combinations of intraspecific variation in multiple species within an...

Data from: Terrigenous subsidies in lakes support zooplankton production mainly via a green food chain and not the brown food chain

Jotaro Urabe, Fumiya Hirama, Hideyuki Doi, Takehiro Kazama, Takumi Noguchi, Tyler H. Tappenbeck, Izumi Katano, Masato Yamamichi, Takehito Yoshida & James J. Elser
Terrestrial organic matter (t-OM) has been recognized as an important cross-boundary subsidy to aquatic ecosystems. However, recent evidence has shown that t-OM contributes little to promote secondary production in lakes because it is low quality food for aquatic consumers. To resolve this conflict, we performed a field experiment using leaf litter as t-OM. In the experiment, we monitored zooplankton biomass in enclosures with and without addition of leaf litter under shaded and unshaded conditions and...

Data from: A shady phytoplankton paradox: when phytoplankton increases under low light

Masato Yamamichi, Takehiro Kazama, Kotaro Tokita, Izumi Katano, Hideyuki Doi, Takehito Yoshida, Nelson Hairston, Jotaro Urabe & Nelson G. Hairston
Light is a fundamental driver of ecosystem dynamics, affecting the rate of photosynthesis and primary production. In spite of its importance, less is known about its community-scale effects on aquatic ecosystems compared with those of nutrient loading. Understanding light limitation is also important for ecosystem management, as human activities have been rapidly altering light availability to aquatic ecosystems. Here we show that decreasing light can paradoxically increase phytoplankton abundance in shallow lakes. Our results, based...

Distribution records: Reconciling biodiversity conservation and flood risk reduction: the new strategy for freshwater protected areas

Takumi Akasaka, Terutaka Mori, Nobuo Ishiyama, Yuya Takekawa, Tomonori Kawamoto, Mikio Inoue, Hiromune Mitsuhashi, Hidetaka Ichiyanagi, Norio Onikura, Yo Miyake, Izumi Katano, Munemitsu Akasaka & Futoshi Nakamura
Aim: Natural disaster risk reduction (DRR) is becoming a more important function of protected area (PAs) for current and future global warming. However, biodiversity conservation and DRR have been handled separately and their interrelationship has not been explicitly addressed. This is mainly because, due of prevailing strategies and criteria for PA placement, a large proportion of PAs are currently located far from human-occupied areas, and habitats in human-occupied areas have been largely ignored as potential...

Registration Year

  • 2022
  • 2020
  • 2019
  • 2018
  • 2016
  • 2015

Resource Types

  • Dataset


  • Nara Women's University
  • University of Hyogo
  • Tohoku University
  • University of Tokyo
  • Hokkaido University
  • Kyoto University
  • Cornell University
  • Museum of Nature and Human Activities Hyogo
  • University of Montana
  • Kyushu University