共 33 条
Life histories and soil water content preferences of sympatric exotic and native terrestrial isopods
被引:6
|作者:
Tanaka, Ryutaro
[1
]
Karasawa, Shigenori
[2
]
机构:
[1] Osaka Prefectural Tennoji High Sch, Osaka, Japan
[2] Tottori Univ, Fac Agr, Dept Life & Environm Agr Sci, Tottori, Japan
关键词:
Agnaridae;
Armadillidiidae;
Armadillidium vulgare;
clutch size;
Mongoloniscus koreanus;
Oniscidea;
soil animals;
ARMADILLIDIUM-VULGARE ISOPODA;
PHENOTYPIC PLASTICITY;
BIOLOGICAL INVASIONS;
BREEDING PHENOLOGY;
SPECIES INVASIONS;
ONISCIDEA;
CRUSTACEA;
PATTERNS;
ECOLOGY;
TRAITS;
D O I:
10.1111/ens.12298
中图分类号:
Q96 [昆虫学];
学科分类号:
摘要:
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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页码:198 / 209
页数:12
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