15 Works

Data from: Adaptive phenotypic variation among clonal ant workers

Eisuke Hasegawa, Saori Watanabe, Yuuka Murakami & Fuminori Ito
Phenotypic variations are observed in most organisms, but their significance is not always known. The phenotypic variations observed in social insects are exceptions. Genetically based response threshold variances have been identified among workers and are thought to play several important adaptive roles in social life, e.g. allocating tasks among workers according to demand, promoting the sustainability of the colony and forming the basis of rationality in collective decision-making. Several parthenogenetic ants produce clonal workers and...

Data from: Suffering in receivers: negative effects of noise persist regardless of experience in female anurans

Masayuki Senzaki, Taku Kadoya, Clinton D. Francis, Nobuo Ishiyama & Futoshi Nakamura
1. Anthropogenic noise is widespread, and growing evidence suggests that it can negatively affect animals through many different mechanisms including masking of cues and signals, distraction, and aversion to noise. 2. Acoustic masking has received the most attention from researchers and recent evidence suggests that masking effects can be mitigated by alteration of signal frequencies or amplitudes by signalers. Additionally, alteration can be a learned response via prior experience with noise exposure. However, it remains...

Data from: Predator size divergence depends on community context

Yutaka Okuzaki & Teiji Sota
Body size is a multi-functional trait related to various fitness components, but the relative importance of different selection pressures are seldom resolved. In Carabus japonicus beetles, of which the larvae exclusively prey on earthworms, adult body size is related to the presence/absence of a larger congener and habitat temperature. In sympatry, C. japonicus consistently exhibits smaller body size which is effective for avoiding interspecific mating, but in allopatry, it shows size variation unrelated to temperature....

Data from: Song performance is a condition-dependent dynamic trait honestly indicating the quality of paternal care in the Bull-headed Shrike

Yuusuke Nishida & Masaoki Takagi
The good parent hypothesis in sexual selection predicts that if females can increase their fitness by mating with males who provide high-quality parental care, then female preferences for male phenotypes honestly indicating the quality of paternal care will evolve. In order to test this hypothesis, we investigated correlations between male song, the timing of pair formation of males, male feeding rate, and reproductive success, in the Bull-headed Shrike Lanius bucephalus (an altricial oscine passerine with...

Data from: Female-female competition leads to female-biased sex allocation and dimorphism in brood sex composition in a gall-forming aphid

Xin Tong, Shinichi Akimoto & Shin-Ichi Akimoto
1. Sex allocation in animals is predicted to be skewed from a 1:1 ratio if sons and daughters yield different marginal fitness returns per unit maternal investment. 2. We tested this prediction using the gall-forming aphid Tetraneura sorini, in which lethal fighting is common among females, whereas male-male competition is moderate. Mothers (autumnal winged females) parthenogenetically produce females and males in their abdomen and can control their sizes and numbers. The females and males do...

Data from: Effects of aphid parasitism on host plant fitness in an aphid-host relationship.

Saori Watanabe, Yuuka Murakami & Eisuke Hasegawa
Aphids are serious agricultural insect pests which exploit the phloem sap of host plants and thus transmit pathogens to their hosts. However, the degree to which aphid parsitism affects the fitness of the host plants is not well understood. The aphid, Macrosiphoniella yomogicola, parasitizes the mugwort Artemisia montana in Japan. During summer most mugworts carry aphids, but most aphid colonies die out after the budding of A. montana inflorescences in late summer. A few aphid...

Data from: Variations in ramet performance and the dynamics of an alpine evergreen herb, Gentiana nipponica, in different snowmelt conditions

Yuka Kawai & Gaku Kudo
Premise of the study: Variation in demographic parameters reflects the life-history strategies of plants in response to specific environments. We aimed to investigate the intraspecific variation in life-history traits of a clonal alpine herb, Gentiana nipponica, in various snowmelt conditions. Methods: Individual ramets within genets accumulate leaves for 7-9 years without shedding, and die after reproduction. We tested the physiological function of accumulated leaves for reproduction and monitored the ramet demography in early, intermediate, and...

Data from: Patterns of reproductive isolation in a haplodiploid – strong post‐mating, prezygotic barriers among three forms of a social spider mite

Yukie Sato, Hironori Sakamoto, Tetsuo Gotoh, Yutaka Saito, Jung-Tai Chao, Martijn Egas & Atsushi Mochizuki
In speciation research, much attention is paid to the evolution of reproductive barriers, preventing diverging groups from hybridizing back into one gene pool. The prevalent view is that reproductive barriers evolve gradually as a byproduct of genetic changes accumulated by natural selection and genetic drift in groups that are segregated spatially and/or temporally. Reproductive barriers, however, can also be reinforced by natural selection against maladaptive hybridization. These mutually compatible theories are both empirically supported by...

Data from: Phylogenomics and the evolution of hemipteroid insects

Kevin P. Johnson, Christopher H. Dietrich, Frank Friedrich, Rolf G. Beutel, Benjamin Wipfler, Ralph S. Peters, Julie M. Allen, Malte Petersen, Alexander Donath, Kimberly K. O. Walden, Alexey M. Kozlov, Lars Podsiadlowski, Christoph Mayer, Karen Meusemann, Alexandros Vasilikopoulos, Robert M. Waterhouse, Stephen L. Cameron, Christiane Weirauch, Daniel R. Swanson, Diana M. Percy, Nate B. Hardy, Irene Terry, Shanlin Liu, Xin Zhou, Bernhard Misof … & Kazunori Yoshizawa
Hemipteroid insects (Paraneoptera), with over 10% of all known insect diversity, are a major component of terrestrial and aquatic ecosystems. Previous phylogenetic analyses have not consistently resolved the relationships among major hemipteroid lineages. We provide maximum likelihood-based phylogenomic analyses of a taxonomically comprehensive dataset comprising sequences of 2,395 single-copy, protein-coding genes for 193 samples of hemipteroid insects and outgroups. These analyses yield a well-supported phylogeny for hemipteroid insects. Monophyly of each of the three hemipteroid...

Data from: Phylogeographic diversification and postglacial range dynamics shed light on the conservation of the kelp Saccharina japonica

Jie Zhang, Jianting Yao, Zi-Min Hu, Alexander Jueterbock, Norishige Yotsukura, Tatiana N. Krupnova, Chikako Nagasato & Delin Duan
Studies of postglacial range shifts could enhance our understanding of seaweed species’ responses to climate change, and hence facilitate the conservation of natural resources. However, the distribution dynamics and phylogeographic diversification of the commercially and ecologically important kelp Saccharina japonica in the Northwest Pacific (NWP) are still poorly surveyed. In this study, we analyzed the evolutionary history of S. japonica using two mitochondrial markers and 24 nuclear microsatellites. A STRUCTURE analysis revealed two partially isolated...

Data from: Comparative limb proportions reveal differential locomotor morphofunctions of alligatoroids and crocodyloids

Masaya Iijima, Tai Kubo & Yoshitsugu Kobayashi
Although two major clades of crocodylians (Alligatoroidea and Crocodyloidea) were split during the Cretaceous, relatively few morphological and functional differences between them have been known. In addition, interaction of multiple morphofunctional systems that differentiated their ecology has barely been assessed. In this study, we examined the limb proportions of crocodylians to infer the differences of locomotor functions between alligatoroids and crocodyloids, and tested the correlation of locomotor and feeding morphofunctions. Our analyses revealed crocodyloids including...

Data from: Evolution of patterned plumage as a sexual signal in estrildid finches

Masayo Soma & Laszlo Zsolt Garamszegi
Colour patterns, such as bars or dots, that cover the body surface of animals are generally thought to play roles in signalling and camouflage. In birds, however, the macroscopic aspects of plumage colouration are less well understood, as past studies typically described plumage colourations by using spectrophotometric analyses. To provide insight into the evolution of plumage patterns as sexual signals, we characterised interspecific and intersexual variations in the plumage patterns of estrildid finches and tested...

Data from: Oyster aquaculture impacts Zostera marina epibiont community composition in Akkeshi-ko estuary, Japan

Carter S. Smith, Minako Ito, Mizuho Namba & Masahiro Nakaoka
Coastal fisheries are in decline worldwide, and aquaculture has become an increasingly popular way to meet seafood demand. While finfish aquaculture can have substantial adverse effects on coastal ecosystems due mostly to necessary feed inputs, bivalves graze on natural phytoplankton and are often considered for their positive ecosystem services. We conducted two independent studies to investigate the effects of long-line Crassostrea gigas oyster aquaculture on Zostera marina seagrass beds and associated epibiont communities in Akkeshi-ko...

Data from: Simulated hatching failure predicts female plasticity in extra-pair behavior over successive broods

Teru Yuta, Daisuke Nomi, Malika Ihle & Itsuro Koizumi
While many studies have investigated the occurrence of extra-pair paternity (EPP) and its adaptive significance in wild population of birds, we still know surprising little about the plasticity in mating behavior of females at the individual level and how it affects the patterns of paternity. To address this question, we focused on the direct fertility benefit hypothesis for the function of EPP and studied if female birds react in extra-pair mating behavior after reproductive failures...

Data from: Heart rate during hyperphagia differs between two bear species

Boris Fuchs, Koji Yamazaki, Alina L. Evans, Toshio Tsubota, Shinsuke Koike, Tomoko Naganuma & Jon M. Arnemo
Hyperphagia is a critical part of the yearly cycle of bears when they gain fat reserves before entering hibernation. We used heart rate as a proxy to compare the metabolic rate between the Asian black bear (Ursus thibetanus) in Japan and the Eurasian brown bear (Ursus arctos) in Sweden from summer in to hibernation. In the hyperphagic period, black bears feed on fat- and carbohydrate-rich hard masts whereas brown bears feed on sugar-rich berries. Availability...

Registration Year

  • 2018

Resource Types

  • Dataset


  • Hokkaido University
  • California Polytechnic State University
  • University of Hamburg
  • Ibaraki University
  • Zoological Research Museum Alexander Koenig
  • University of North Carolina
  • Natural History Museum
  • University of Lausanne
  • Taiwan Forestry Research Institute
  • Heidelberg Institute for Theoretical Studies