Invasive non‐native species attributes and invasion extent: examining the importance of grain size

Journal of Vegetation Science - Tập 23 Số 1 - Trang 33-40 - 2012
Munemitsu Akasaka1, Masayuki Takada2, Rie Kitagawa2, Hiroshi Igarashi3
1National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
2Hokkaido Research Organization Institute of Environmental Sciences W12, N19, Kita-ku Sapporo Hokkaido 060-0819 Japan
3Hokkaido Institute of Wild Plants 1-7-5, Shintomi Chitose Hokkaido 066-0037 Japan

Tóm tắt

AbstractQuestionsDo differences in species attributes explain the variation in invasion extent among non‐native plant species? Which attributes of the invasion process exhibit scale dependency and which do not?LocationHokkaido prefecture, northern Japan.MethodsWe calculated the invasion extent of 316 non‐native plant species based on gridded maps at three different spatial scales (grain size of approximately 2 km × 2 km, 10 km × 10 km and 80 km × 80 km). Relationships between the invasion extent of 316 non‐native plant species and their attributes that are likely to enhance introduction (human use and introduction period), establishment (height, clonality, longevity and life form) and expansion (seed size, introduction period) were evaluated using phylogenetic regression.ResultsIrrespective of grain size, non‐native species with clonality, those used as fodder or for landscaping, and those with a historically earlier introduction period had significantly larger invasion extents than species without such attributes. In contrast, seed size, which is related to successful expansion, was negatively correlated with invasion extent and was significant only at the finest grain.ConclusionsOur results suggest that the presence of scale‐dependent responses of the species attributes on their grain size may be caused by the invasion process to which the attribute is related. When developing general rules for invasiveness, researchers must consider the grain size at which the invasion extent is calculated.

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Journal of Vegetation Science

Tập 23 Số 1

33-40

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