Scholarlink

<p>Pollination services are critical for supporting healthy forests, so understanding the structure of plant-pollinator interactions can improve conservation outcomes for land managers. We evaluated changes in plant-pollinator interaction networks across a 35-year stand age gradient in intensively managed Douglas-fir (<i>Pseudotsuga menziesii</i>) forests of western Oregon, USA, representing successional conditions across a typical harvest rotation. We hand-netted insects visiting flowers in bloom on 60 stands, resulting in 928 recorded interactions. Bees were the most observed floral visitors regardless of stand age, representing 75.8% of recorded interactions, followed by flies (14.4%), wasps (5.2%), beetles (1.9%), and butterflies (0.4%). The most visited flowers were <i>Hypochaeris radicata</i>, <i>Crepis capillaris</i>, <i>Rubus ursinus</i>, <i>Digitalis purpurea</i>, and <i>Lucanthemum vulgare</i>. Of these, only <i>Rubus ursinus</i> is native to the region; 71% of recorded visits were to non-native plants<i>.</i> In stands &lt; 15 years post-harvest – where most interactions occurred – the number of bee species in networks and network interaction diversity decreased with time since harvest. Several characteristics of plant-bee networks found to be important in non-forest settings, such as network modularity, connectance, and robustness, varied little relative to time since harvest. Our study demonstrates that most pollinator-plant interactions in Douglas fir stands occurred shortly after harvest. Furthermore, the role of different plant and insect taxa&#xa0;– including non-native species&#xa0;– changed as stands aged; non-native species of both plants and bees played a large role in networks but were most prominent in recently harvested stands.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Plant-Pollinator Networks Simplify And Dominant Floral Visitors Shift with Time Since Harvest in Regenerating Douglas-fir Plantations

  • 期刊论文

  • 发表日期：

    2025年8月19日

查看全文
  • Sara M. Galbraith,
  • Rachel A. Zitomer,
  • James W. Rivers

摘要

Pollination services are critical for supporting healthy forests, so understanding the structure of plant-pollinator interactions can improve conservation outcomes for land managers. We evaluated changes in plant-pollinator interaction networks across a 35-year stand age gradient in intensively managed Douglas-fir (Pseudotsuga menziesii) forests of western Oregon, USA, representing successional conditions across a typical harvest rotation. We hand-netted insects visiting flowers in bloom on 60 stands, resulting in 928 recorded interactions. Bees were the most observed floral visitors regardless of stand age, representing 75.8% of recorded interactions, followed by flies (14.4%), wasps (5.2%), beetles (1.9%), and butterflies (0.4%). The most visited flowers were Hypochaeris radicata, Crepis capillaris, Rubus ursinus, Digitalis purpurea, and Lucanthemum vulgare. Of these, only Rubus ursinus is native to the region; 71% of recorded visits were to non-native plants. In stands < 15 years post-harvest – where most interactions occurred – the number of bee species in networks and network interaction diversity decreased with time since harvest. Several characteristics of plant-bee networks found to be important in non-forest settings, such as network modularity, connectance, and robustness, varied little relative to time since harvest. Our study demonstrates that most pollinator-plant interactions in Douglas fir stands occurred shortly after harvest. Furthermore, the role of different plant and insect taxa – including non-native species – changed as stands aged; non-native species of both plants and bees played a large role in networks but were most prominent in recently harvested stands.