scholarly journals Development of microsatellites in Machilus thunbergii (Lauraceae), a warm-temperate coastal tree species in Japan

2012 ◽  
Vol 99 (7) ◽  
pp. e265-e267 ◽  
Author(s):  
Y. Kaneko ◽  
C. Lian ◽  
S. Watanabe ◽  
K.-i. Shimatani ◽  
H. Sakio ◽  
...  
Keyword(s):  
Tree Species ◽  
Machilus Thunbergii ◽  
Warm Temperate

scholarly journals Detecting the Early Genetic Effects of Habitat Degradation in Small Size Remnant Populations of Machilus thunbergii Sieb. et Zucc. (Lauraceae)

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Shuntaro Watanabe ◽  
Yuko Kaneko ◽  
Yuri Maesako ◽  
Naohiko Noma
Keyword(s):  
Genetic Differentiation ◽  
Tree Species ◽  
Human Activities ◽  
Habitat Degradation ◽  
Allelic Diversity ◽  
Genetic Effects ◽  
Mature Trees ◽  
Japanese Coast ◽  
Large Populations ◽  
Machilus Thunbergii

Habitat degradation caused by human activities has reduced the sizes of many plant populations worldwide, generally with negative genetic impacts. However, detecting such impacts in tree species is not easy because trees have long life spans. Machilus thunbergii Sieb. et Zucc. (Lauraceae) is a dominant tree species of broad-leaved evergreen forests distributed primarily along the Japanese coast. Inland habitats for this species have become degraded by human activities. To investigate the effects of habitat degradation on genetic structure, we compared the genetic diversities of mature and juvenile trees of five M. thunbergii populations around Lake Biwa in Japan. Allelic diversity was influenced by past lineage admixture events, but the effects of forest size were not clear. On the other hand, the inbreeding coefficient of the juvenile stage was higher in small populations, whereas large populations maintained panmictic breeding. Also, the extent of genetic differentiation was greater in juveniles than in mature trees. We detected the early genetic effects of habitat degradation in small, isolated M. thunbergii populations, indicating that habitat degradation increases inbreeding and genetic differentiation between populations.

Flood Resistance of Tristaniopsis laurina and Acmena smithii From Riparian Warm Temperate Rain-Forest in Victoria

1990 ◽  
Vol 38 (4) ◽  
pp. 371 ◽  
Author(s):  
DR Melick
Keyword(s):  
Growth Rate ◽  
Water Stress ◽  
Tree Species ◽  
Rain Forest ◽  
Ecological Status ◽  
Flood Damage ◽  
Temperate Rainforest ◽  
Flood Resistance ◽  
Temperate Rain Forest ◽  
Warm Temperate

The responses of seedlings of Tristaniopsis laurina and Acmena smithii, two important tree species in riparian warm temperate rainforest communities in Victoria, are investigated in relation to flood disturbances. Freshly germinated A. smithii seedlings had died within 5 weeks of complete waterlogging in the greenhouse, and although the young T. laurina seedlings survived waterlogging for 14 weeks, their growth rate was curtailed. Nine-month-old seedlings of both species were found to be relatively tolerant to waterlogging, forming aerenchymatous surface roots after 40 days of flooding. Neither species suffered leaf abscission or demonstrated any other signs of water stress commonly associated with flood intolerant species. In experiments to determine the resilience of these species to physical flood damage, both species also demonstrated a capacity to regenerate vegetatively following the removal of above ground parts in young seedlings. The heartwood of T. laurina was found to be more decay resistant than that of other species in the field including that of A. smithii. The significance of these results are discussed in relation to other factors examined in earlier papers adding to the understanding of the ecological status of these species within the riparian rainforest communities.

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