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J Biogeo:于明坚等千岛湖岛屿面积对物种丰富度的影响研究获进展

  1. J Biogeo
  2. 于明坚
  3. 千岛湖
  4. 影响
  5. 物种丰富度
  6. 进展

来源:浙江大学生科院 2012-11-18 08:44

近日,国际杂志Journal of Biogeography在线刊登了浙江大学生科院研究者的最新研究成果“Richness and composition of plants and birds on land-bridge islands: effects of island attributes and differential responses of species groups,”...

近日,国际杂志Journal of Biogeography在线刊登了浙江大学生科院研究者的最新研究成果“Richness and composition of plants and birds on land-bridge islands: effects of island attributes and differential responses of species groups,”,文章中,研究者揭示了千岛湖岛屿面积对物种丰富度的影响的研究进展。

自达尔文的物种起源一书出版以来,岛屿生物地理学一直是全球生态学家和进化生物学家十分关注的领域,而Journal of Biogeography是国际生物地理学会主办的旗舰刊物,在该领域有很高的影响力。

于明坚等(2012)根据千岛湖41个岛屿上植物和鸟类调查数据,采用先进的统计方法,研究了岛屿空间特征和生境片段化格局对植物和鸟类物种丰富度和组成的影响。研究发现,千岛湖岛屿面积对物种丰富度的影响显著但比起其它片段化景观较低,植物物种丰富度主要受面积本身的影响,但鸟类物种丰富度、植物和鸟类组成主要受其它代表生境异质性的空间特征影响,并且这种影响在不同类群上各异。

岛屿隔离度对物种丰富度无显著影响,但对岛屿间物种组成差异有贡献。总之,这一景观格局对植物和鸟类的影响是尺度依赖和类群分异的,生境片段化对生物多样性的影响不单取决于生境丧失的程度,还与片段化的特定格局密切相关。(生物谷Bioon.com)

Richness and composition of plants and birds on land-bridge islands: effects of island attributes and differential responses of species groups

Mingjian Yu1, Guang Hu1, Kenneth J. Feeley2, Jianguo Wu3, Ping Ding1,*

Aim  To test relationships between the richness and composition of vascular plants and birds and attributes of habitat fragments using a model land-bridge island system, and to investigate whether the effects of fragmentation differ depending on species natural history traits. Location  Thousand Island Lake, China. Methods  We compiled presence/absence data of vascular plant and bird species through exhaustive surveys of 41 islands. Plant species were assigned to two categories: shade-intolerant and shade-tolerant species; bird species were assigned to three categories: edge, interior, and generalist species. We analysed the relationships between island attributes (area, isolation, elevation, shape complexity, and perimeter to area ratio) and species richness using generalized linear models (GLMs). We also investigated patterns of composition in relation to island attributes using ordination (redundancy analysis). Results  We found that island area explained a high degree of variation in the species richness of all species groups. The slope of the species–area relationship (z) was 0.16 for all plant species and 0.11 for all bird species. The lowest z-value was for generalist birds (0.04). The species richness of the three plant species groups was associated with island area per se, while that of all, generalist, and interior birds was explained mainly by elevation, and that of edge bird species was associated primarily with island shape. Patterns of species composition were most strongly related to elevation, island shape complexity, and perimeter to area ratio rather than to island area per se. Species richness had no significant relationship with isolation, but species composition did. We also found differential responses among the species groups to changes in island attributes. Main conclusions  Within the Thousand Island Lake system, the effects of fragmentation on both bird and plant species appear to be scale-dependent and taxon-specific. The number of plant species occurring on an island is strongly correlated with island area, and the richness of birds and the species composition of plants and birds are associated with variables related to habitat heterogeneity. We conclude that the effects of fragmentation on species diversity and composition depend not only on the degree of habitat loss but also on the specific patterns of habitat fragmentation.

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