第11回生態適応セミナー

 

 

Pieter Zuidema 博士

Department of Biology, Faculty of Sciences, Utrecht University

 
     
 
The importance of variation among individuals for tree population dynamics
 
     
 

日時 3月23日 15:00-

 
  場所 生物地学共通講義室 (青葉山キャンパス理学部生物棟)  

Trees in forest environments experience highly varying growing conditions. This is true for individual trees in the course of their lives: canopy openings, droughts, damage, etc. But there is also ample variation in growing conditions among trees, related to topography, nutrient availability and other conditions that vary over space. Variation in growing conditions can have major implications for the chance to reach reproductive size and the age at which this happens. This clearly has important implications for population dynamics and fitness. Trees of one species in a particular population that have experienced favourable conditions and reach reproductive size at young age have a boosting effect on population growth and therefore a higher fitness. In the study of tree population dynamics, surprisingly little attention has been paid to the implications of growth variation among individuals. Demographic studies have mainly used average growth rates, without accounting for the large degree of growth variation among individuals. I will show examples of persistent variation in growth among trees of tropical forest species at different sites. Then, I will show how new insights on the ecology of tropical forest trees can be obtained from demographic studies that explicitly account for growth variation among trees.

略歴

現在、ユトレヒト大学理学部生物学科植物生態学多様性学研究室のスタッフで いらっしゃいますピータさんは、ユトレヒト大学在学中からボリビア、東ケニヤ、ス マト ラ、ベトナム等多くの研究地で活躍されてきました。学位は、プロマブ (PROMAB)の 一環として行ったボリビア熱帯雨林の樹木個体群動態の研究で修めてお ります。その 後は、個体群生態学をベースに、さまざまな生態学的研究に着手されて おります。熱 帯雨林を主たる調査地として、熱帯雨林の生態学、熱帯雨林の持続可能 な利用、熱帯 雨林の保全に興味を持ち、研究を進められており、それぞれに素晴らし い研究業績をお持ちです。最近は、フロリダ大学のFrancis Putz博士と共同で熱帯雨 林の保全研究 を精力的に行っております。