11 Works

Data from: Optimal management strategy of insecticide resistance under various insect life histories: heterogeneous timing of selection and inter-patch dispersal

Masaaki Sudo, Daisuke Takahashi, David A. Andow, Yoshito Suzuki & Takahiko Yamanaka
Although theoretical studies have shown that the mixture strategy, which uses multiple toxins simultaneously, can effectively delay the evolution of insecticide resistance, whether it is the optimal management under different insect life histories and insecticide types remains unknown. To test the robustness of the management strategy over the life histories, we developed a series of simulation models which cover almost all the diploid insect types and have the same basic structure describing pest population dynamics...

Data from: A phylogeographical survey of a highly dispersive spider reveals eastern Asia as a major glacial refugium for Palaearctic fauna

Henrik Krehenwinkel, Maxene Graze, Dennis Roedder, Tanaka Kazuhiro, Yuki G. Baba, Christoph Muster, Gabriele Uhl & Kazuhiro Tanaka
Aim: The phylogeographical history of wide-ranging Palaearctic species is not well understood. Here, we present a range-wide phylogeographical study of the wasp spider, Argiope bruennichi (Scopoli, 1772), a highly dispersive and widely distributed Palaearctic species. We aim to identify glacial refugia and patterns of interglacial gene flow across the Palaearctic. Location: Palaearctic region, including the Azores, Madeira, Europe, North Africa and Asia. Methods: We conduct a range-wide phylogeographical survey. Our study is based on nuclear...

Data from: Dead or alive? Sexual conflict and lethal copulatory interactions in long-jawed Tetragnatha spiders

Yuki G. Baba, Akio Tanikawa, Mayura B. Takada & Kyoko Futami
Inter- and intra-sexual selection are important driving forces that lead to diversification of sexual characteristics. Tetragnatha spiders have elongated chelicerae and sexual dimorphism in chelicera length whose magnitude varies among species. Because they use their chelicerae during copulation and as weapons in male–male competition, this divergence reflects repeated inter- and intra-sexual selection. To infer the causes of chelicera length diversity, we examined the roles of the elongated chelicerae in copulatory behaviour of a Tetragnatha species...

Alien insect dispersal mediated by the global movement of commodities

Gyda Fenn-Moltu, Gyda Fenn-Moltu, Sébastien Ollier, Barney Caton, Andrew Liebhold, Helen Nahrung, Deepa Pureswaran, Rebecca Turner, Takehiko Yamanaka & Cleo Bertelsmeier
Globalization and economic growth are recognized as key drivers of biological invasions. Alien species have become a feature of almost every biological community worldwide, and rates of new introductions continue to rise as the movement of people and goods accelerates. Insects are among the most numerous and problematic alien organisms, and are mainly introduced unintentionally with imported cargo or arriving passengers. However, the processes occurring prior to insect introductions remain poorly understood. We used a...

Comparative Phylogeography of Veronica spicata and V. longifolia (Plantaginaceae) Across Europe: Integrating Hybridization and Polyploidy in Phylogeography

Khan Gulzar, Buono Daniele, Bernhard Von Hagen, Petr A. Kosachev, Eike Mayland-Quellhorst, Sergei L. Mosyakin & Dirk C. Albach
Climatic fluctuations in the Pleistocene caused glacial expansion-contraction cycles in Eurasia and other parts of the world. Consequences of these cycles, such as population expansion and subsequent subdivision, have been studied in many taxa at intraspecific population level across much of the Northern Hemisphere. However, the consequences for the potential of hybridization and polyploidization are poorly understood. Here, we investigated the phylogeographic structure of two widespread, closely related species, Veronica spicata and Veronica longifolia, across...

Data from: Disentangling the drivers of invasion spread in a vector-borne tree disease

Yutaka Osada, Takehisa Yamakita, Etsuko Shoda-Kagaya, Andrew M. Liebhold & Takehiko Yamanaka
1. Pine wilt disease (PWD) invaded southern Japan in the early 1900’s and has gradually expanded its range to northern Honshu (Japanese mainland). The disease is caused by a pathogenic North American nematode, which is transmitted by native pine sawyer beetles. Recently the disease has invaded other portions of East Asia and Europe where extensive mortality of host pines is anticipated to resemble historical patterns seen in Japan. 2. There is a critical need to...

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: Recurrent insect outbreaks caused by temperature-driven changes in system stability

William A. Nelson, Ottar N. Bjornstad & Takehiko Yamanaka
Insect species often undergo regular outbreaks in population density, but identifying the causal mechanism for such outbreaks in any particular species has proven difficult. Here we show that outbreak cycles in the tea tortrix Adoxophyes honmai can be explained by temperature-driven changes in system stability. Wavelet analysis of a 51yr time series spanning over 200 outbreaks reveals a threshold in outbreak amplitude each spring when temperature exceeds 15°C, and a secession of outbreaks each fall...

Data from: Insecticide applications to soil contribute to development of Burkholderia mediating insecticide resistance in stinkbugs

Kanako Tago, Yoshitomo Kikuchi, Shinji Nakaoka, Chie Katsuyama, Masahito Hayatsu & Sinji Nakaoka
Some soil Burkholderia strains are capable of degrading the organophosphorus insecticide, fenitrothion, and establish symbiosis with stinkbugs, making the host insects fenitrothion-resistant. However, the ecology of the symbiotic degrading Burkholderia adapting to fenitrothion in the free-living environment is unknown. We hypothesized that fenitrothion applications affect the dynamics of fenitrothion-degrading Burkholderia, thereby controlling the transmission of symbiotic degrading Burkholderia from the soil to stinkbugs. We investigated changes in the density and diversity of culturable Burkholderia (i.e....

Data from: Is a larger refuge always better? Dispersal and dose in pesticide resistance evolution

Daisuke Takahashi, Takehiko Yamanaka, Masaaki Sudo & David A. Andow
The evolution of resistance against pesticides is an important problem of modern agriculture. The high-dose/refuge strategy, which divides the landscape into treated and non-treated (refuge) patches, has proven effective at delaying resistance evolution. However, theoretical understanding is still incomplete, especially for combinations of limited dispersal and partially recessive resistance. We reformulate a two-patch model based on the Comins model and derive a simple quadratic approximation to analyze the effects of limited dispersal, refuge size and...

Data from: Organic farming and associated management practices benefit multiple wildlife taxa: a large-scale field study in rice paddy landscapes

Naoki Katayama, Yutaka Osada, Miyuki Mashiko, Yuki G. Baba, Koichi Tanaka, Yoshinobu Kusumoto, Satoru Okubo, Hiroaki Ikeda & Yosihiro Natuhara
1. Organic farming has potential for the conservation of global biodiversity and associated ecosystem services. Despite this, knowledge of the effects of organic farming systems on farmland biodiversity is limited in Asia, the worldwide leader in rice production. 2. We conducted the first national-scale study to investigate the effects of three different rice farming systems (conventional, low-input, and organic) and specific management practices (e.g. herbicide and insecticide applications, crop rotation, and levee-vegetation management) on species...

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