Yuya Fukano

The evolution of increased competitive ability hypothesis (EICA) predicts that when alien plants are free from their natural enemies they evolve lower allocation to defense in order to achieve a higher growth rate. If this hypothesis is true, the converse implication would be that the defense against herbivory could be restored if a natural enemy also becomes present in the introduced range. We tested this scenario in the case of Ambrosia artemisiifolia (common ragweed) - a species that invaded

Raising public interest in and conservation activity for threatened species is critically important for successful biodiversity conservation. However, our understanding of what influences the public interest in threatened animals and how the interest induces conservation activities is quite limited. Here, we examined the role of zoos and a television program featuring animated animals in shaping public interest in and support for animals including threatened species from 2011 to 2018 in Japan. P

Fleshy fruits can be divided between climacteric (CL, showing a typical rise in respiration and ethylene production with ripening after harvest) and non-climacteric (NC, showing no rise). However, despite the importance of the CL/NC traits in horticulture and the fruit industry, the evolutionary significance of the distinction remains untested. In this study, we tested the hypothesis that NC fruits, which ripen only on the plant, are adapted to tree dispersers (feeding in the tree), and CL fruit

This paper describes the preparation of monosialoganglioside GM1 with sialidase-producing marine bacteria as a microbial biocatalyst. A new sialidase-producing bacterium, identified tentatively as Pseudomonas sp. strain YF-2, was isolated from seawater by enrichment culture with ganglioside as the sole source of carbon. When YF-2 was cultured in a synthetic medium containing crude bovine brain gangliosides at 25 degrees C for 3 days, 80 to 90% of the gangliosides were converted to GM1. GM1 was t

Abstract Competition among neighbouring plants plays essential roles in growth, reproduction, population dynamics, and community assembly, but how competition drives local adaptation and the traits underlying the adaptation remain unclear. Here, we focused on populations of the aggressive weed Digitaria ciliaris from urban and rural habitats as low‐ and high‐competition environments for light resources and examined how competitive interaction drove contemporary adaptive divergence of competitive

Host range expansion of herbivorous insects is a key event in ecological speciation and insect pest management. However, the mechanistic processes are relatively unknown because it is difficult to observe the ongoing host range expansion in natural population. In this study, we focused on the ongoing host range expansion in introduced populations of the ragweed leaf beetle, Ophraella communa, to estimate the evolutionary process of host plant range expansion of a herbivorous insect. In the nativ

Prevalence of impervious surface and resulting higher temperatures in urban areas, known as urban heat islands, comprises prominent characteristics in global cities. However, it is not known whether and how urban plants adapt to such heat stress. This study focused on <i>Oxalis corniculata</i>, which has intraspecific polymorphism in leaf color (green and red) and examined whether the leaf color variation is associated with urban heat stress. Field observations revealed that green-leaved plants

Accumulating evidence indicates that plants are capable of self/non-self and kin/stranger discrimination. Plants increase biomass of and resource allocation to roots when they encounter roots of conspecific non-self-neighbors, but not when they encounter self roots. Root proliferation usually occurs at the expense of reproductive investment. Therefore, if clonal crops are capable of self/non-self-discrimination, spatially aggregated planting with seedlings of the same genotype may decrease root

Movement and growth habit of climbing plants have attracted attention since the time of Charles Darwin; however, there are no reports on whether plants can choose suitable hosts or avoid unsuitable ones based on chemoreception. Here, I show that the tendrils of <i>Cayratia japonica</i> (Vitaceae) appear to avoid conspecific leaves using contact chemoreception for oxalates, which are highly concentrated in <i>C. japonica</i> leaves. The coiling experiments show that <i>C. japonica</i> has a flexi

Abstract We found that the abundance of Ophraella communa, a specialist herbivore of the invasive weeds Ambrosia artemisiifolia and A. trifida, is higher in the introduced range than in its native range. We also found that the native O. communa does not feed on A. trifida, but introduced O. communa does so extensively. Keywords: invasive speciesbiogeographical approachbiological control Ambrosia artemsiifolia Ambrosia trifida Acknowledgements We thank the members of the ecology group at the Kyus

Abstract Raising public awareness and support for endangered species is critical for global biodiversity conservation. However, we know little about which factors drive public interest in wildlife and how an increase in people's interest shapes their behaviours towards wildlife conservation. The animal debut of ex situ endangered species at zoos may raise general public interest in the conservation of these species. We assessed the impact of an animal debut using a case study of ex situ‐ bred Ja