31 Works

The effects of resource subsidy duration in a detritus-based stream ecosystem: a mesocosm experiment

Takuya Sato, Gaku Takimoto & Rui Ueda
1. Most resource subsidies are temporally variable, dynamically affecting the consumer populations, community structures, and ecosystem functions of recipient ecosystems. Temporally variable resource subsidies are characterized by the duration, magnitude, timing, and frequency of resource subsidy inputs. These different characteristics may have different mechanisms by which to affect recipient ecosystems. 2. Few studies have examined the duration of resource subsidy inputs on recipient ecosystems, although there exist previous studies focusing on magnitude, timing, and frequency....

Phylogeographic and demographic modelling analyses of the multiple origins of the rheophytic goldenrod Solidago yokusaiana

Ryuuta Kyan, Takuma Kimura, Tadashi Yamashiro, Shinji Fujii, Shota Sakaguchi, Motomi Ito, Atsushi Nagano, Hiroshi Kudoh & Masayuki Maki
Understanding adaptation mechanisms is important in evolutionary biology. Parallel adaptation provides good opportunities to investigate adaptive evolution. To confirm parallel adaptation, it is effective to examine whether the phenotypic similarity has one or multiple origins and to use demographic modelling to consider the gene flow between ecotypes. Solidago yokusaiana is a rheophyte endemic to the Japanese Archipelago that diverged from Solidago virgaurea. This study examined the parallel origins of S. yokusaiana by distinguishing between multiple...

Data from: Early origin of sweet perception in the songbird radiation

Yasuka Toda, Meng-Ching Ko, Qiaoyi Liang, Eliot Miller, Alejandro Rico-Guevara, Tomoya Nakagita, Ayano Sakakibara, Kana Uemura, Timothy Sackton, Takashi Hayakawa, Simon Yung Wa Sin, Yoshiro Ishimaru, Takumi Misaka, Pablo Oteiza, James Crall, Scott Edwards, Shuichi Matsumura & Maude Baldwin
Early events in the evolutionary history of a clade can shape the sensory systems of descendant lineages. Although the avian ancestor may not have had a sweet receptor, the widespread incidence of nectar-feeding birds suggests multiple acquisitions of sugar detection. In this study, we identify a single early sensory shift of the umami receptor (the T1R1-T1R3 heterodimer) that conferred sweet-sensing abilities in songbirds, a large radiation containing nearly half of all living birds. We demonstrate...

Effects of body size divergence on male mating tactics in the ground beetle Carabus japonicus

Yutaka Okuzaki
Animal body size is involved in reproduction in various ways. Carabus japonicus exhibits considerable variation in adult body size across geographical locations depending on the larval environment. To investigate the effects of body size divergence on male mating traits, spermatophore deposition and weight, copulation duration, and post-copulatory mounting were observed using male-female pairs from C. japonicus populations with different body sizes. Then, variables with high predictive power on the mating traits were identified from individual...

Emergence of structures from parasitic species in a spatially distributed molecular system

Nathanael Aubert-Kato, Guillaume Gines, Yannick Rondelez & Teruo Fujii
This dataset contains microscopy images from a microfluidic setup implementing a localized autocatalytic molecular system based on the PEN DNA toolbox. Due to the enzymatic nature of the catalytic process, a variety of parasitic species eventually emerge and compete with the legitimate molecular process for fuel. The behaviors observed range from the creation of large stable structures to that of small diffusing particles. Those results, along with the modularity of the molecular system, show that...

Biodiversity-productivity relationships are key to nature-based climate solutions

Akira Mori, Laura Dee, Andrew Gonzalez, Haruka Ohashi, Jane Cowles, Alexandra Wright, Michel Loreau, Yann Hautier, Tim Newbold, Peter Reich, Tetsuya Matsui, Wataru Takeuchi, Kei-Ichi Okada, Rupert Seidl & Forest Isbell
The global impacts of biodiversity loss and climate change are interlinked but the feedbacks between them are rarely assessed. Areas with greater tree diversity tend to be more productive, providing a greater carbon sink, and biodiversity loss could reduce these natural C sinks. Here, we quantify how tree and shrub species richness could affect biomass production at biome, national and regional scales. We find that greenhouse gas mitigation could help maintain tree diversity and thereby...

Data from: Intrinsic growth heterogeneity of mouse leukemia cells underlies differential susceptibility to a growth-inhibiting anticancer drug

Akihisa Seita, Hidenori Nakaoka, Reiko Okura & Yuichi Wakamoto
Cancer cell populations consist of phenotypically heterogeneous cells. Growing evidence suggests that pre-existing phenotypic differences among cancer cells correlate with differential susceptibility to anticancer drugs and eventually lead to a relapse. Such phenotypic differences can arise not only externally driven by the environmental heterogeneity around individual cells but also internally by the intrinsic fluctuation of cells. However, the quantitative characteristics of intrinsic phenotypic heterogeneity emerging even under constant environments and their relevance to drug susceptibility...

Data from: Polyandry and paternity affect disease resistance in eusocial wasps

Tatsuya Saga, Masaki Okuno, Kevin Loope, Koji Tsuchida, Kako Ohbayashi, Masakazu Shimada & Yasukazu Okada
One of several hypotheses proposed to explain polyandry in eusocial insects is the parasite–pathogen hypothesis (PPH), in which a colony of workers with multiple patrilines due to queen polyandry is less likely to fall victim to a parasite or pathogen threat because of genetic variability of the colony’s workforce. We challenged colonies with different strains of an entomopathogenic fungus to determine pathogen virulence and worker survival. We found that workers from different patrilines differed in...

Three sex phenotypes in a haploid algal species give insights into the evolutionary transition to a self-compatible mating system

Kohei Takahashi, Hiroko Kawai-Toyooka, Ryo Ootsuki, Takashi Hamaji, Yuki Tsuchikane, Hiroyuki Sekimoto, Tetsuya Higashiyama & Hisayoshi Nozaki
Mating systems of haploid species such as fungi, algae, and bryophytes are either heterothallic (self-incompatible) with two sex phenotypes (male and female, or mating type minus and plus in isogamous species) or homothallic (self-compatible) with only a bisexual phenotype producing zygotes within a clone. The anisogamous volvocine green alga Pleodorina starrii is a haploid species previously reported to have a heterothallic mating system. Here, we found that two additional culture strains originating from the same...

Data from: Parallel cognitive processing streams in human prefrontal cortex: parsing areal-level brain network for response inhibition

Takahiro Osada, Akitoshi Ogawa, Akimitsu Suda, Koji Nakajima, Masaki Tanaka, Satoshi Oka, Koji Kamagata, Shigeki Aoki, Yasushi Oshima, Sakae Tanaka, Nobutaka Hattori & Seiki Konishi
Multiple cognitive processes are recruited to achieve adaptive behavior. However, it is poorly understood how such cognitive processes are implemented in temporal cascades of human cerebral cortical areas as processing streams to achieve behavior. In the present study, we identify cortical processing streams for response inhibition and examine relationships among the processing streams. Functional magnetic resonance imaging (MRI) and time-resolved single-pulse transcranial magnetic stimulation (TMS) reveal three distinct critical timings of transient disruption in the...

Disentangling the direct and indirect effects of canopy and understory vegetation on the foraging habitat selection of the brown bear Ursus arctos

Kanji Tomita & Tsutom Hiura
Elucidating the factors affecting the foraging habitat selection of wildlife can further our understanding of the animal– habitat relationships and inform wildlife conservation and management. Canopy and understory vegetation may directly or indirectly affect the foraging habitat selection of carnivores through changes in habitat structure and prey availability, respectively; however, the relative importance of these two effects remains largely unknown. Dwarf bamboo Sasa kurilensis is a predominant understory plant that suppresses regeneration in the forests...

The supplementary datasets of the study of free moment Induced by oblique transverse tarsal joint: investigation by constructive approach

Tsung-Yuan Chen, Kawakami Takahiro, Naomichi Ogihara & Koh Hosoda
The human foot provides numerous functions that let humans deal with various environments. Recently, study of the structure of the human foot and adjustment of an appropriate reaction force and vertical free moment during bipedal locomotion has gained attention. However, little is known about the mechanical (morphological) contribution of the foot structure to the reaction force and free moment. It is difficult to conduct a comparative experiment to investigate the contribution systematically by using conventional...

Comprehensive comparative morphology and developmental staging of final instar larvae toward metamorphosis in the insect order Odonata

Genta Okude, Takema Fukatsu & Ryo Futahashi
The order Odonata (dragonflies and damselflies) is among the most ancestral groups of winged insects with drastic morphological changes upon metamorphosis, and thus important for understanding evo-devo aspects of insects. However, basic developmental descriptions of Odonata have been scarce. In an attempt to establish the foundation of developmental and experimental biology of Odonata, we present an unprecedentedly comprehensive survey of dragonflies and damselflies, in total 158 larvae representing 49 species and 14 families, wherein morphological...

GPS tracks and behaviour detection of chick-rearing streaked shearwaters at Funakoshi Oshima Island, Japan, 2018 & 2019

Aran Garrod, Sei Yamamoto, Kentaro Sakamoto & Katsufumi Sato
The study of seabird behaviour has largely relied on animal-borne tags to gather information, requiring interpretation to estimate at-sea behaviours. Details of shallow-diving birds’ foraging are less known than deep-diving species due to difficulty in identifying shallow dives from biologging devices. Development of smaller video loggers allow a direct view of these birds’ behaviours, at the cost of short battery life. However, recordings from video loggers combined with relatively low power usage accelerometers give a...

Sperm competition risk affects ejaculate strategy in terms of sperm number but not sperm size in squid

Yoko Iwata, Noriyosi Sato, Noritaka Hirohashi, Yoshiro Watanabe, Warwick Sauer & Paul Shaw
In polygamous species, the mode of sperm storage in females influences evolution of sperm quantitative and qualitative traits because it provides the arena for sperm competition, cryptic female choice and fertilization processes. In this study, we compared ejaculate traits of two squid species, Heterololigo bleekeri and Loligo reynaudii. Both species show dimorphic sperm traits associated with alternative reproductive tactics where consort and sneaker males transfer sperm to different storage sites within a female (on the...

Data from: Metabolic proxy for cephalopods: Stable carbon isotope values recorded in different biogenic carbonates

Ming-Tsung Chung, Ching-Yi Chen, Jen-Chieh Shiao, Kotaro Shirai & Chia-Hui Wang
1. Measuring the metabolic rate of marine animals in their natural environment is challenging, impeding our understanding of their physiological ecology. Recently, a novel metabolic proxy, namely the δ13C values of biogenic carbonates (otoliths), was experimentally validated in teleost fishes. Cephalopods possess several types of biogenic carbonates, such as statolith, cuttlebone, and other internal and external shells, which are all potential metabolic recorders, but few have been evaluated. 2. To test the feasibility of the...

Data from: Effectiveness of signs of activity as relative abundance indices for wild boar

Daishi Higashide, Takeo Kuriyama, Shun Takagi, Yoshihiro Nakashima, Keita Fukasawa, Gota Yajima, Minoru Kasada & Mayumi Yokoyama
Population growth in wild boars and feral pigs (Sus scrofa) has negative environmental and economic implications worldwide. Accordingly, it is necessary to monitor population trends for appropriate management. Despite the potential for bias, relative abundance indices based on signs of activity have the potential to be practical, low-cost monitoring tools for data collection at a local scale and over large areas. However, few studies have examined the effectiveness of specific signs as measures of relative...

Data from: Phylogeny of gracillariid leaf-mining moths: evolution of larval behaviour inferred from phylogenomic and Sanger data

Xuankun Li, Ryan St Laurent, Chandra Earl, Camiel Doorenweerd, Erik Van Nieukerken, Don Davis, Atsushi Kawakita, Shigeki Kobayashi, Andreas Zwick, Carlos Lopez-Vaamonde, Issei Ohshima & Akito Kawahara
Gracillariidae is the most taxonomically diverse cosmopolitan leaf-mining moth family, consisting of nearly 2000 named species in 105 described genera, classified into eight extant subfamilies. The majority of gracillariid species are internal plant feeders as larvae, creating mines and galls in plant tissue. Despite their diversity and ecological adaptations, their phylogenetic relationships, especially at the subfamily level, remain largely uncertain. Genomic data (83 taxa and 589 loci) were integrated with Sanger data (130 taxa and...

Rotary catalysis of bovine mitochondrial F1-ATPase studied by single-molecule experiments

Ryohei Kobayashi, Hiroshi Ueno, Chun-Biu Li & Hiroyuki Noji
The reaction scheme of rotary catalysis and the torque generation mechanism of bovine mitochondrial F1 (bMF1) were studied in single-molecule experiments. Under ATP-saturated concentrations, high-speed imaging of single 40 nm gold bead attached to the γ subunit of bMF1 showed two types of intervening pauses during the rotation that were discriminated by short dwell and long dwell. Using ATPgS as a slowly hydrolyzing ATP derivative as well as using a functional mutant bE188D with slowed...

EnKF Analyses and Forecasts of Hurricane Harvey (2017)

Y. Zhang, S.B. Sieron, Y. Lu, X. Chen, R.G. Nystrom, M. Minamide, M. Chan, C.M. Hartman, Z. Yao, J.H. Ruppert, A. Okazaki, S.J. Greybush & E.E. Clothiaux
Ensemble-based data assimilation of radar observations across inner-core regions of tropical cyclones (TCs) in tandem with satellite all-sky infrared radiances across the TC domain improves TC track and intensity forecasts. This study further investigates potential enhancements in TC track, intensity, and rainfall forecasts via assimilation of all-sky microwave radiances using Hurricane Harvey (2017) as an example. Assimilating GPM constellation all-sky microwave radiances in addition to GOES-16 all-sky infrared radiances reduces the forecast errors in the...

Revisiting of Carex sect. Confertiflorae s.l. (Cyperaceae): new data from molecular and morphological evidence and first insights on Carex biogeography in East Asia.

Yi-Fei Lu, Xiao-Feng Jin, Hiroshi Ikeda, Okihito Yano, Carmen Benítez Benítez, Wei-Jie Chen, Yong-Di Liu, Pedro Jiménez-Mejías & Ming-Jian Yu
Carex sect. Confertiflorae s.l., contains ca. 40 species and diverse in E Asia. It has one of the most unstable delimitations in the literature, and the section was proposed to split into two sections up to five different ones. Recent phylogenetic reconstructions showed Confertiflorae s.l. not to be monophyletic. In this study we investigate the phylogenetic structure, morphological affinities, and biogeographic history of sect. Confertiflorae s.l. We performed a taxon-based approach to explore the morphological...

Roles of the ClC chloride channel CLH-1 in food-associated salt chemotaxis behavior of C. elegans

Chanhyun Park, Yuki Sakurai, Hirofumi Sato, Shinji Kanda, Yuichi Iino & Hirofumi Kunitomo
The ability of animals to process dynamic sensory information facilitates foraging in an ever changing environment. However, molecular and neural mechanisms underlying such ability remain elusive. The ClC anion channels/transporters play a pivotal role in cellular ion homeostasis across all phyla. Here we find a ClC chloride channel is involved in salt concentration chemotaxis of C. elegans. Genetic screening identified two altered-function mutations of clh-1 that disrupt experience-dependent salt chemotaxis. Using genetically encoded fluorescent sensors,...

Butterfly functional diversity in north west Japan

Kei Uchida & Atushi Ohwaki
Anthropogenic activities can negatively impact the major shifts in butterfly functional diversity in semi-natural ecosystems. However, little is known about their functional trait diversity, rather than total species richness, driven by forest fragmentation and urbanization. In the present study, we evaluated whether forest fragmentation and urbanization affects the functional diversity and stability of butterfly assemblages. Regarding the anthropogenic impacts on butterfly biodiversity loss, we predicted that the functional diversity and temporal stability of butterfly species...

Data from: Intraspecific variations in life history traits of two pecky rice bug species from Japan: mapping emergence dates and number of annual generations

Kazuhisa Yamasaki, Ken Tabuchi, Akihiko Takahashi, Takeshi Osawa, Akira Yoshioka, Yasushi Ishigooka, Shigeto Sudo & Mayura Takada
The mirid bugs Stenotus rubrovittatus and Trigonotylus caelestialium, which cause pecky rice, have become a threat to rice cultivation in Asia. Damage caused by these pests has rapidly become frequent since around 2000 in Japan. Their expansion pattern is not simple, and predicting their future spread remains challenging. Some insects with wide ranges have locally adapted variations in life-history traits. We performed laboratory rearing experiments to assess the geographical scale of intraspecific variations in life-history...

Genomic evidence for speciation with gene flow in broadcast spawning marine invertebrates

Shotaro Hirase
How early stages of speciation in free-spawning marine invertebrates proceeds is poorly understood. The Western Pacific abalones, Hatiois discus, H. madaka, and H. gigantea occur in sympatry with shared breeding season and are capable of producing viable F1 hybrids in spite of being ecologically differentiated. Population genomic analyses revealed that although the three species are genetically distinct, there is evidence for historical and ongoing gene flow among these species. Evidence from demographic modeling suggests that...

Registration Year

  • 2021

Resource Types

  • Dataset


  • University of Tokyo
  • Kyoto University
  • National Institute for Environmental Studies
  • Kyoto Prefectural University
  • Tokyo Metropolitan University
  • National Institute of Advanced Industrial Science and Technology
  • Gifu University
  • Hokkaido University
  • Chuo University
  • Kobe University