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Papers by Hirotaka Tanaka
Journal of Asia-Pacific Entomology, 2017
Kalandyk-Kołodziejczyk M.-The second instar of Brevennia pulveraria (Newstead, 1892) (Hemiptera C... more Kalandyk-Kołodziejczyk M.-The second instar of Brevennia pulveraria (Newstead, 1892) (Hemiptera Coccomorpha Pseudococcidae) with notes on the taxonomic affinities of the species. The second instar of Brevennia pulveraria is described and illustrated. The characteristic features common to both the adult female and second-instar nymph are presented. The characters of immature instars may be useful for identification to species level. Notes on the taxonomic affinity of B. pulveraria are presented.
Crop Production under Stressful Conditions, 2018
Cassava is an important crop, in which root tubers have been known as a staple food in tropical a... more Cassava is an important crop, in which root tubers have been known as a staple food in tropical area. Recently, cassava tubers are processed by various methods into numerous products and utilized in various ways. The land area of cassava cultivation has been increasing especially in Southeast Asia. Such a situation is causing an introduction of new cassava diseases and insect pests in the region. In the main part of this chapter, we reviewed the current cassava situation in Vietnam, Cambodia, and Thailand and then illustrated the major cassava diseases and insect pests and their management methods. In addition, we described the international activities developing the cassava agriculture to date, the existing agricultural extension system, and the socioeconomic situation of cassava farmers. Since 2016, we have been conducting SATREPS project to establish a management of invasive cassava diseases and insect pests. At last part chapter, we showed our approach to establish the sustainable agriculture of cassava.
Ecology and Evolution
The positive association between disturbances and biological invasions is a widely observed ecolo... more The positive association between disturbances and biological invasions is a widely observed ecological pattern in the Anthropocene. Such patterns have been hypothesized to be driven by the superior competitive ability of invaders or by modified environments, as well as by the interaction of these factors. An experimental study that tests these hypotheses is usually less feasible, especially in protected nature areas. An alternative approach is to focus on community resilience over time after the anthropogenic disturbance of habitats. Here, we focused on ant communities within a forest to examine their responses after disturbance over time. We selected the Yanbaru region of northern Okinawa Island, which is a biodiversity hotspot in East Asia. We compared ant communities among roadside environments in forests where the road age differed from 5 to 25 years. We also monitored the ant communities before and after disturbance from forest thinning. We found that the species richness and abundance of exotic ants were higher in recently disturbed environments (roadsides of 5–15 years old roads), where the physical environment was warmer and drier. In contrast, the roadsides of 25‐year‐old roads indicated the potential recovery of the physical environment with cooler and moister conditions, likely owing to regrowth of roadside vegetation. At these sites, there were few exotic ants, except for those immediately adjacent to the road. The population density of the invasive species Technoymex brunneus substantially increased 1–2 years after forest thinning. There was no evidence of the exclusion of native ants by exotic ants that were recorded after disturbance. Our results suggest that local ant communities in the Yanbaru forests have some resilience to disturbance. We suggest that restoration of environmental components is a better strategy for maintaining native ant communities, rather than removing exotic ants after anthropogenic disturbance.
ZooKeys, Mar 9, 2015
A new soft scale (Hemiptera: Coccoidea: Coccidae) species, Pulvinaria caballeroramosae Tanaka & K... more A new soft scale (Hemiptera: Coccoidea: Coccidae) species, Pulvinaria caballeroramosae Tanaka & Kondo, sp. n., is described from specimens collected on twigs of Ficus soatensis Dugand (Moraceae) in Bogota, Colombia. The new species resembles P. drymiswinteri Kondo & Gullan, described from Chile on Drimys winteri J.R. Forst. & G. Forst. (Winteraceae), but differs in the distribution of preopercular pores on the dorsum, the presence of dorsal tubular ducts, dorsal microducts, and reticulation on the anal plates; and in its feeding habits, i.e., P. caballeroramosae feeds on the twigs whereas P. drymiswinteri feeds on the leaves of its host. A key to the Colombian species of Pulvinaria Targioni Tozzetti is provided.
Species diversity : an international journal for taxonomy, systematics, speciation, biogeography, and life history research of animals, 2007
A pulvinariine soft scale, Pulvinaria .tToccijlera <Westwood, 1870), is redescribed and illustrat... more A pulvinariine soft scale, Pulvinaria .tToccijlera <Westwood, 1870), is redescribed and illustrated based on microscopic examination of the morphology of several adult female specimens ot' the type series. These syntypic specimens exhibit a diiferent distribution of tubular duets than that presented in several previous taxonomic aceounts of P, floceijlera based on other material.
FIGURE 1. A scatter plot of the first two principal component (PC) scores from the Principal Comp... more FIGURE 1. A scatter plot of the first two principal component (PC) scores from the Principal Component Analysis of 199 specimens. Solid black circles = Phenacoccus solani type specimens; solid black triangles = P. defectus type specimens; greyfilled circles = voucher specimens of P. solani from Japan from the population used for DNA extraction; grey-filled upwardspointing triangles = voucher specimens of P. solani from Turkey from the population used for DNA extraction; grey-filled downward-pointing triangles = voucher specimens of P. defectus from Italy from the population used for DNA extraction; greyfilled squares = voucher specimens of P. solani from Israel from the population used for DNA extraction; and open circles = other non-type specimens of either P. defectus or P. solani.
Zootaxa, 2017
Coccus hesperidum L. (Hemiptera: Coccomorpha: Coccidae), the type species of the soft scale genus... more Coccus hesperidum L. (Hemiptera: Coccomorpha: Coccidae), the type species of the soft scale genus Coccus L., the family Coccidae and the whole of the scale insects (Coccoidea), is a cosmopolitan plant pest. Using DNA sequence data and morphological comparisons, we determine that there is a distinct species that is morphologically very similar to C. hesperidum. Here, we describe the species as Coccus praetermissus Lin & Tanaka sp. n., based on adult female specimens from Australia, Malaysia and Thailand. The adult female of C. praetermissus sp. n. differs from C. hesperidum in having dorsal setae with bluntly rounded tips, whereas they are sharply pointed in C. hesperidum. A detailed description of the newly recognised species is provided, incorporating adult female morphology and DNA sequences from mitochondrial and nuclear loci. Our examination of slides from The Natural History Museum, London, and several Australian institutions indicates that C. praetermissus sp. n. has been conf...
An armored scale, Lindingaspis ferrisi MCKENZIE, 1950, is recorded for the first time from Okinaw... more An armored scale, Lindingaspis ferrisi MCKENZIE, 1950, is recorded for the first time from Okinawa Island, Japan, and the adult female is briefly described with illustrations of the pygidium. This species resembles L. rossi, L. keniyae and L. mackenziei, but differs from them in having 2-4 small-sized dorsal macroducts near the base of the pygidium.
Journal of Asia-Pacific Entomology, 2017
Kalandyk-Kołodziejczyk M.-The second instar of Brevennia pulveraria (Newstead, 1892) (Hemiptera C... more Kalandyk-Kołodziejczyk M.-The second instar of Brevennia pulveraria (Newstead, 1892) (Hemiptera Coccomorpha Pseudococcidae) with notes on the taxonomic affinities of the species. The second instar of Brevennia pulveraria is described and illustrated. The characteristic features common to both the adult female and second-instar nymph are presented. The characters of immature instars may be useful for identification to species level. Notes on the taxonomic affinity of B. pulveraria are presented.
Crop Production under Stressful Conditions, 2018
Cassava is an important crop, in which root tubers have been known as a staple food in tropical a... more Cassava is an important crop, in which root tubers have been known as a staple food in tropical area. Recently, cassava tubers are processed by various methods into numerous products and utilized in various ways. The land area of cassava cultivation has been increasing especially in Southeast Asia. Such a situation is causing an introduction of new cassava diseases and insect pests in the region. In the main part of this chapter, we reviewed the current cassava situation in Vietnam, Cambodia, and Thailand and then illustrated the major cassava diseases and insect pests and their management methods. In addition, we described the international activities developing the cassava agriculture to date, the existing agricultural extension system, and the socioeconomic situation of cassava farmers. Since 2016, we have been conducting SATREPS project to establish a management of invasive cassava diseases and insect pests. At last part chapter, we showed our approach to establish the sustainable agriculture of cassava.
Ecology and Evolution
The positive association between disturbances and biological invasions is a widely observed ecolo... more The positive association between disturbances and biological invasions is a widely observed ecological pattern in the Anthropocene. Such patterns have been hypothesized to be driven by the superior competitive ability of invaders or by modified environments, as well as by the interaction of these factors. An experimental study that tests these hypotheses is usually less feasible, especially in protected nature areas. An alternative approach is to focus on community resilience over time after the anthropogenic disturbance of habitats. Here, we focused on ant communities within a forest to examine their responses after disturbance over time. We selected the Yanbaru region of northern Okinawa Island, which is a biodiversity hotspot in East Asia. We compared ant communities among roadside environments in forests where the road age differed from 5 to 25 years. We also monitored the ant communities before and after disturbance from forest thinning. We found that the species richness and abundance of exotic ants were higher in recently disturbed environments (roadsides of 5–15 years old roads), where the physical environment was warmer and drier. In contrast, the roadsides of 25‐year‐old roads indicated the potential recovery of the physical environment with cooler and moister conditions, likely owing to regrowth of roadside vegetation. At these sites, there were few exotic ants, except for those immediately adjacent to the road. The population density of the invasive species Technoymex brunneus substantially increased 1–2 years after forest thinning. There was no evidence of the exclusion of native ants by exotic ants that were recorded after disturbance. Our results suggest that local ant communities in the Yanbaru forests have some resilience to disturbance. We suggest that restoration of environmental components is a better strategy for maintaining native ant communities, rather than removing exotic ants after anthropogenic disturbance.
ZooKeys, Mar 9, 2015
A new soft scale (Hemiptera: Coccoidea: Coccidae) species, Pulvinaria caballeroramosae Tanaka & K... more A new soft scale (Hemiptera: Coccoidea: Coccidae) species, Pulvinaria caballeroramosae Tanaka & Kondo, sp. n., is described from specimens collected on twigs of Ficus soatensis Dugand (Moraceae) in Bogota, Colombia. The new species resembles P. drymiswinteri Kondo & Gullan, described from Chile on Drimys winteri J.R. Forst. & G. Forst. (Winteraceae), but differs in the distribution of preopercular pores on the dorsum, the presence of dorsal tubular ducts, dorsal microducts, and reticulation on the anal plates; and in its feeding habits, i.e., P. caballeroramosae feeds on the twigs whereas P. drymiswinteri feeds on the leaves of its host. A key to the Colombian species of Pulvinaria Targioni Tozzetti is provided.
Species diversity : an international journal for taxonomy, systematics, speciation, biogeography, and life history research of animals, 2007
A pulvinariine soft scale, Pulvinaria .tToccijlera <Westwood, 1870), is redescribed and illustrat... more A pulvinariine soft scale, Pulvinaria .tToccijlera <Westwood, 1870), is redescribed and illustrated based on microscopic examination of the morphology of several adult female specimens ot' the type series. These syntypic specimens exhibit a diiferent distribution of tubular duets than that presented in several previous taxonomic aceounts of P, floceijlera based on other material.
FIGURE 1. A scatter plot of the first two principal component (PC) scores from the Principal Comp... more FIGURE 1. A scatter plot of the first two principal component (PC) scores from the Principal Component Analysis of 199 specimens. Solid black circles = Phenacoccus solani type specimens; solid black triangles = P. defectus type specimens; greyfilled circles = voucher specimens of P. solani from Japan from the population used for DNA extraction; grey-filled upwardspointing triangles = voucher specimens of P. solani from Turkey from the population used for DNA extraction; grey-filled downward-pointing triangles = voucher specimens of P. defectus from Italy from the population used for DNA extraction; greyfilled squares = voucher specimens of P. solani from Israel from the population used for DNA extraction; and open circles = other non-type specimens of either P. defectus or P. solani.
Zootaxa, 2017
Coccus hesperidum L. (Hemiptera: Coccomorpha: Coccidae), the type species of the soft scale genus... more Coccus hesperidum L. (Hemiptera: Coccomorpha: Coccidae), the type species of the soft scale genus Coccus L., the family Coccidae and the whole of the scale insects (Coccoidea), is a cosmopolitan plant pest. Using DNA sequence data and morphological comparisons, we determine that there is a distinct species that is morphologically very similar to C. hesperidum. Here, we describe the species as Coccus praetermissus Lin & Tanaka sp. n., based on adult female specimens from Australia, Malaysia and Thailand. The adult female of C. praetermissus sp. n. differs from C. hesperidum in having dorsal setae with bluntly rounded tips, whereas they are sharply pointed in C. hesperidum. A detailed description of the newly recognised species is provided, incorporating adult female morphology and DNA sequences from mitochondrial and nuclear loci. Our examination of slides from The Natural History Museum, London, and several Australian institutions indicates that C. praetermissus sp. n. has been conf...
An armored scale, Lindingaspis ferrisi MCKENZIE, 1950, is recorded for the first time from Okinaw... more An armored scale, Lindingaspis ferrisi MCKENZIE, 1950, is recorded for the first time from Okinawa Island, Japan, and the adult female is briefly described with illustrations of the pygidium. This species resembles L. rossi, L. keniyae and L. mackenziei, but differs from them in having 2-4 small-sized dorsal macroducts near the base of the pygidium.