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81 0 0 0 OA Incidence of Germinable Seeds of Ludwigia grandiflora subsp. hexapetala (Onagraceae) in the Feces of Lake Biwa’s Waterfowl

著者
Shinya Hieda Konomi Ota Kisa Nagamine Hiroki Kobayashi Naohiko Noma
出版者
The Japanese Society for Plant Systematics
雑誌
Acta Phytotaxonomica et Geobotanica (ISSN:13467565)
巻号頁・発行日
vol.74, no.1, pp.47-51, 2023-02-28 (Released:2023-03-15)
Endozoochorous dispersal of the invasive alien aquatic plant Ludwigia grandiflora subsp. hexapetala through waterfowl in Lake Biwa, Japan, is reported. Germination of seeds collected from the feces of waterfowl in Yabase, southern Lake Biwa proved them to be viable. It is necessary to be vigilant against the sudden appearance of L. grandiflora subsp. hexapetala in water systems where it is absent and to monitor its dispersal by waterfowl.

2 0 0 0 OA Ludwigia grandiflora (Michx.) Greuter & Burdet subsp. hexapetala (Hook. & Arn.) G. L. Nesom & Kartesz, an Invasive Aquatic Plant in Lake Biwa, the Largest Lake in Japan

著者
Shinya Hieda Yuko Kaneko Masato Nakagawa Naohiko Noma
出版者
The Japanese Society for Plant Systematics
雑誌
Acta Phytotaxonomica et Geobotanica (ISSN:13467565)
巻号頁・発行日
vol.71, no.1, pp.65-71, 2020-02-29 (Released:2020-03-17)
Ludwigia grandiflora (Michx.) Greuter & Burdet is an invasive aquatic plant native to an area ranging from the southeastern United States to South America. In previous reports, L. grandiflora in Lake Biwa has been identified as L. grandiflora subsp. grandiflora, a hexaploid subspecies (2n = 48) or L. grandiflora sensu lato. Species of Ludwigia sect. Jussiaea, are morphologically very similar. Morphological characters, especially floral characters and cytology (chromosome number) have been used to identify species and subspecies. In our study, the morphological characteristics of L. grandiflora in Lake Biwa substantially corresponded to those of L. grandiflora subsp. hexapetala (Hook. & Arn.) G. L. Nesom & Kartesz, a decaploid (2n = 80) subspecies. The chromosome number of L. grandiflora in Lake Biwa was 2n = ca. 80, the same as in L. grandiflora subsp. hexapetala (2n = 80). Importantly, L. grandiflora in Lake Biwa is not L. grandiflora subsp. grandiflora, but rather L. grandiflora subsp. hexapetala. This re-identification has implications for management in Lake Biwa, since the life history of L. grandiflora subsp. hexapetala has been studied in Europe.