The Process of Decline of an Endangered Tree Species, <i>Pinus armandii</i> Franch. var. <i>amamiana</i> (Koidz.) Hatusima, on the Southern Slope of Mt. Hasa-dake in Yaku-shima Island

Kanetani, Seiichi; Akiba, Mitsuteru; Nakamura, Kenichiro; Gyokusen, Koichiro; Saito, Akira

doi:10.1007/bf02762473

Cited by 7 publications

(10 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The number of living PAAm trees in their native habitats was estimated at 1100-1600 in 1994 (Yamamoto and Akashi 1994). Because of its decreasing number in recent years in the field population (Hayashi et al 1984;Kanetani et al 2001), PAAm was classified as IB (EN) in the new Japanese Red List (Environment Agency of Japan 2000) which denotes a high possibility of extinction in the near future. Some researchers have suggested that several factors, including inbreeding depression (Hayashi 1988;Kanazashi et al 1998), poor regeneration characteristics (Chigira 1995;Kanetani et al 1996Kanetani et al , 1998, and pine wilt disease (Hayashi et al 1984;Yamamoto and Akashi 1994), have caused the decline of PAAm.…”

Section: Introductionmentioning

confidence: 99%

Susceptibility of adult trees of the endangered speciesPinus armandiivar.amamianato pine wilt disease in the field

Akiba

Nakamura

2005

Journal of Forest Research

Self Cite

View full text Add to dashboard Cite

Adult trees of Pinus armandii var. amamiana (PAAm) and P. thunbergii grown in the field were inoculated with 100 000 or 1000 of the nematode Bursaphelenchus xylophilus to evaluate their susceptibility to pine wilt disease. PAAm trees inoculated with 100 000 nematodes started to show disease symptoms 2 weeks after inoculation, and all died within 29 weeks. Although the PAAm trees inoculated with 1000 nematodes tended to show delayed disease symptoms compared with those inoculated with 100 000 nematodes, all of them died within 33 weeks after inoculation. All P. thunbergii trees inoculated with 1000 nematodes had died 6 weeks after inoculation. In the nematode-inoculated PAAm trees, death of branches distal to the nematode inoculation site was the first visible symptom, followed by the systemic discoloration of needles, whereas the whole tree wilted simultaneously in P. thunbergii trees. In nematode-inoculated PAAm trees, the period from inoculation to death was longer than that in P. thunbergii. These results suggest that adult PAAm trees are susceptible to pine wilt disease, but are less vulnerable than P. thunbergii.

show abstract

Section: Introductionmentioning

confidence: 99%

Susceptibility of adult trees of the endangered speciesPinus armandiivar.amamianato pine wilt disease in the field

Akiba

Nakamura

2005

Journal of Forest Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…A monitoring study of the decline process and PAAm mortality factors has been conducted since 1994 on Yaku‐shima and Tanega‐shima by K anetani et al. (2001) and Kanetani et al.…”

Section: Introductionmentioning

confidence: 99%

Detection of Bursaphelenchus xylophilus from old discs of dead Pinus armandii var. amamiana trees using a new detection kit

et al. 2010

View full text Add to dashboard Cite

We examined the effectiveness of a new Bursaphelenchus xylophilus detection kit, based on loop-mediated isothermal amplification (LAMP), in old discs taken from the stem base of B. xylophilus-infested dead trees of Pinus armandii var. amamiana (PAAm) occurring in their natural habitats. LAMP products, representing a past B. xylophilus infection, were detected in two consecutive trials from 16 of 20 discs collected from PAAm trees that died between 2003 and 2006. Bursaphelenchus xylophilus were more frequently detected using LAMP in wood samples taken from sapwood than from heartwood. No significant differences in the detection of B. xylophilus using LAMP were observed in relation to the disc collection time (from 3 to 6 years before the analysis). Bursaphelenchus xylophilus were not detected using LAMP in four discs, although a B. xylophilus infection had been confirmed for the original PAAm trees at the time they were found dead. This may have resulted from the small amount of wood chips needed for the LAMP test or the reduced number and uneven distribution of the nematode in the old dead trees. The results indicate that the new B. xylophilus detection kit will be a very efficient tool for conducting retrospective analysis of PAAm mortality factors.

show abstract

“…The number of living P. amamiana trees in their native habitats in Yakushima Island was estimated at 1500-2000 (Yahara et al 1987;Yamamoto and Akashi 1994). Because of its decreasing number in recent years in the field population (Kanetani et al 2001), P. amamiana was classified as EN C1 in the Red List, which denotes a high possibility of extinction in the near future (ICUN 2007). The natural habitats of P. amamiana are stony ridges and peaks where the development of understory vegetation is restricted.…”

Section: Speciesmentioning

confidence: 99%

“…Hashadake in Yakushima Island from 1994 to 1998, and estimated 71.4% of the dead trees to pine wilt disease, which has been suggested to cause mass mortality of P. amamiana (Nakamura 2001;Akiba and Nakamura 2005). However, the needs of further investigation to explore other factors responsible for the mortalities were suggested, because Bursaphelenchus xylophilus, the causative agent of pine wilt disease, was not detected in the field survey in Yakushima Island (Kanetani et al 2001;Nakamura 2001).…”

Section: Introductionmentioning

confidence: 96%

“…Skeletons of this pine increased markedly in the 1990s but the causes were not clear. Kanetani et al (2001) measured a 12.9% mortality rate on the southern slope of Mt. Hashadake in Yakushima Island from 1994 to 1998, and estimated 71.4% of the dead trees to pine wilt disease, which has been suggested to cause mass mortality of P. amamiana (Nakamura 2001;Akiba and Nakamura 2005).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Environmental factors influencing the load of long‐range transported air pollutants on Pinus amamiana in Yakushima Island, Japan

Kume¹,

Nagafuchi²,

Suguru³

et al. 2009

Ecological Research

View full text Add to dashboard Cite

With the industrialization in East Asia, greater amounts of ozone and acidic aerosols are transported to Japan. Yakushima Island (30°20¢N, 130°31¢E) is affected directly by long-range transboundary air pollution from the continent because there are no industrial areas and sources of pollution between the continent and the island. Recently, there has been a significant decline of Pinus amamiana in the island and the actual condition of air pollution was investigated. A significant amount of air pollutants were detected in winter. The daily mean tropospheric O 3 concentration was nearly 100 ppb in winter. A large amount of non-sea salt sulfate (nss-SO 4 2À ) was deposited on the needle surfaces in the northwest part of the island and dry deposition rates of SO 4 2À were remarkably higher in February than in November. About half of the increase in SO 4 2À was nss-SO 4 2À and the rate in February was over four to five times as high as that in November. The load of dry deposition on the crown of trees was strongly influenced by the topographic position of the slope. The amount of deposited SO 4 2À was larger on trees growing on ridges and the tendency of P. amamiana to grow on ridges where it sticks out over 20 m enhances the load of dry deposition and O 3 on the needle surfaces. The potassium leakage and ethylene emission from needles were remarkably increased and the needle mass per area decreased from November to February. It was suggested that the additional input of nss-SO 4 2À acidifies the needle surface and accelerates leaf surface deterioration and leaching from needles and soils.

show abstract

The Process of Decline of an Endangered Tree Species, Pinus armandii Franch. var. amamiana (Koidz.) Hatusima, on the Southern Slope of Mt. Hasa-dake in Yaku-shima Island

Cited by 7 publications

References 6 publications

Susceptibility of adult trees of the endangered speciesPinus armandiivar.amamianato pine wilt disease in the field

Susceptibility of adult trees of the endangered speciesPinus armandiivar.amamianato pine wilt disease in the field

Detection of Bursaphelenchus xylophilus from old discs of dead Pinus armandii var. amamiana trees using a new detection kit

Environmental factors influencing the load of long‐range transported air pollutants on Pinus amamiana in Yakushima Island, Japan

Contact Info

Product

Resources

About