Alien terrestrial crustaceans (Isopods and Amphipods). Chapter 7.1

Cochard, Pierre-Olivier; Vilisics, Ferenc; Séchet, Emmanuel

doi:10.3897/biorisk.4.54

Cited by 18 publications

(29 citation statements)

References 24 publications

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“…However, we could not find any data from the Mediterranean region where A. vulgare likely originated (Cochard et al . ). Population densities of 350–550 m −2 recorded for this species in the UK and USA (Paris & Pitelka ; Al‐Dabbagh & Block ; Appendix S2) are also higher than those of most Japanese forest isopods, but not attaining to the maximum density recorded in the present study.…”

Section: Discussionmentioning

confidence: 97%

Life histories and soil water content preferences of sympatric exotic and native terrestrial isopods

Tanaka

Karasawa

2018

Entomological Science

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Exotic species have negative effects on the ecosystems they enter, but often coexist with native species. Clarifying mechanisms behind the coexistence of native and exotic species is important for evaluating effects of such exotic species on native ecosystems. In Japan, at least seven terrestrial isopod species are considered exotic and some have been found with native species. The mechanisms of their coexistence have never been researched. This study examines the hypothesis that an exotic isopod species, Armadillidium vulgare, and native Mongoloniscus koreanus differ in their life histories and soil water content preferences, and that these differences facilitate their coexistence. Field observation revealed that populations of the two species were stably maintained despite large overlap in their life histories and breeding periods, although A. vulgare showed more variability in some aspects of life history than M. koreanus. Two types of choice experiments were carried out to identify their preferences for soil water content levels. The “alone” experiment, where one individual was used per experimental box, showed that the two species were different in preference for soil water content. However, the “group” experiment, where ten individuals of the two species (five of each species) were used per experimental box, suggested that A. vulgare changed its preference from when it was alone, showing preference similar to that of the M. koreanus individuals in the same box. Thus, we concluded that the two species can coexist at the study site, but that the hypothesized mechanisms for their coexistence were not proven in this study.

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Section: Discussionmentioning

confidence: 97%

Life histories and soil water content preferences of sympatric exotic and native terrestrial isopods

Tanaka

Karasawa

2018

Entomological Science

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“…The area of Europe is defined as N35°-N70° and W11°-E23° and the North American region was defined as N10°-N55° and W50°-W135°. The original regions of the seven species examined were unclear, but A. nasatum may have originally been distributed in Italy, southern France and Spain and A. vulgare and P. pruinosus may be native to the Mediterranean region (Cochard et al 2010). For the present study, the authors tentatively considered the European continent as the original distribution area of these taxa, although some species were likely foreign in some parts of Europe (Cochard et al 2010).…”

Section: Species Distribution Datamentioning

confidence: 88%

“…The original regions of the seven species examined were unclear, but A. nasatum may have originally been distributed in Italy, southern France and Spain and A. vulgare and P. pruinosus may be native to the Mediterranean region (Cochard et al 2010). For the present study, the authors tentatively considered the European continent as the original distribution area of these taxa, although some species were likely foreign in some parts of Europe (Cochard et al 2010). In addition, P. scaber was described as a subspecies based on specimens collected from Hokkaido, northern Japan (Verhoeff 1928), but this taxonomic classification was dubious.…”

Section: Species Distribution Datamentioning

confidence: 88%

“…However, at least seven species, Armadillidium nasatum Budde-Lund, 1833, A. vulgare Latreille, 1804, Haplophthalmus danicus Budde-Lund, 1880, Porcellio dilatatus Brandt, 1833, P. laevis Latreille, 1804, P. scaber Latreille, 1804and Porcellionides pruinosus (Brandt, 1833, are considered exotic in Japan; their original distributional areas may have been in the Mediterranean region or Europe (Schmalfuss 2003, Nunomura 2007, Cochard et al 2010. Some researchers have examined the relationship between the distribution of these taxa and land use in Japan (Watanabe 1991, Fujita andWatanabe 1999), but no research has clarified the factors delimiting their distributions at a macro scale.…”

Section: Introductionmentioning

confidence: 99%

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Invasion stages and potential distributions of seven exotic terrestrial isopods in Japan

Karasawa¹,

Nakata²

2018

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Evaluating potential distribution areas and limiting factors for the distribution of exotic species in invasive regions are essential to identify risks and protect the native ecosystem. However, less research has been conducted on the underground ecosystem than for above-ground. Factors, limiting the distributions of exotic terrestrial isopods, have been identified and their invasive stages and potential distribution areas in Japan evaluated. A database of distribution data has been developed for 17,412 terrestrial isopod specimens in Japan and two ecological niche models constructed using 19 bioclimatic variables; the regional model was calculated using data from Japan (invasive region) only, whereas a combination of data from Japan and North America (invasive regions) and Europe (native region) was used to construct the global model. The global model predicted that annual mean temperature and mean diurnal-temperature range were the important limiting factors for most exotic isopods. It was found that Armadillidium nasatum Budde-Lund, 1833, A. vulgare Latreille, 1804, Haplophthalmus danicus Budde-Lund, 1880, Porcellio laevis Latreille, 1804, P. scaber Latreille, 1804 and Porcellionides pruinosus (Brandt, 1833 were composed of stabilising and colonising populations, which enabled prediction of the future spread of distribution areas for these species in Japan. Porcellio dilatatus Brandt, 1833 was introduced in unstable environments and thus was found in fewer locations.

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“…Its exclusive identification in the middle section is probably coincidental, M. graniger having a much larger altitudinal distribution (Giurginca 2009), but because of its endogeous life it is more difficult to observe. If in the high area endemic species are characteristic, in the low one anthropophilous, non-native species like P. pruinosus (Cochard et al 2010) are present. There are differences between the three sections in terms of percentage abundance and the frequency of occurrence of some species.…”

Section: Discussionmentioning

confidence: 99%

Do terrestrial isopods from Vâlsan River protected area reflect the region’s peculiarities? Zoogeographic and conservative implications of a possible answer

Ferenţi¹,

Covaciu-Marcov²

2015

ecomont

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Vâlsan River valley has proved to be a refuge for different animal groups. As a consequence of its importance, we investigated the terrestrial isopods from the area, using the direct collecting method, in the years 2010-2015 and encountered 21 species. Three of them, Hyloniscus motasi, Trachelipus ater and Cylisticus transsilvanicus, are endemic in Romania, underlining the region's zoogeographical peculiarities. We divided the region into three sections (upper, middle and lower), which differ as a result of their different human disturbance. The upper section, which is less affected and without villages, conserves the native isopod fauna better. It has the highest diversity and species richness, the endemic ones being present here. In the middle and lower sections, with settlements, the native terrestrial isopod species' habitats are more limited, the anthropic changes facilitating the advance of some anthropophilous species, even introduced ones. The presence of endemic species for Romania increases the conservative value of the region. The endemic species occupy restricted, natural, humid and forested habitats, underlining their conservative importance.

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Alien terrestrial crustaceans (Isopods and Amphipods). Chapter 7.1

Cited by 18 publications

References 24 publications

Life histories and soil water content preferences of sympatric exotic and native terrestrial isopods

Life histories and soil water content preferences of sympatric exotic and native terrestrial isopods

Invasion stages and potential distributions of seven exotic terrestrial isopods in Japan

Do terrestrial isopods from Vâlsan River protected area reflect the region’s peculiarities? Zoogeographic and conservative implications of a possible answer

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