Scholarlink

<p>Bark beetles play a key role in shaping forest ecosystems, and some species are among the most significant disturbance factors in coniferous forests of the Northern Hemisphere. Their ability to successfully infest living trees is closely linked to mutualistic relationships with microorganisms that help to overcome host defences or provide essential nutrients. For a deeper understanding of the effects of climate change-related temperature alterations on these mutualistic interactions, the present study investigated how temperature affects the development of the pine bark beetle <i>Ips acuminatus</i> and the mycelial growth of its most common ophiostomatoid fungal associates. Key thermal performance parameters of fungi and beetles were determined using laboratory experiments and temperature-dependent development and growth rate models. Temperature had a significant effect on insect development and fungal growth. All fungal species tested on malt extract agar had lower temperature optima (~ 22–28&#xa0;°C) and thermal thresholds (lower thresholds: ~ 3–6&#xa0;°C; upper thresholds: ~ 27–33&#xa0;°C) than <i>I. acuminatus</i> tested in logs (lower threshold: 8.1–9.6&#xa0;°C; optimum temperature: 30.3&#xa0;°C; upper threshold: 36.2&#xa0;°C). Tolerance to high temperatures varied among fungal species. Particularly, the proposed key fungal symbiont, <i>Ophiostoma macrosporum</i>, suggested to be essential for the nutrition of larvae and beetles, showed strong growth reduction at 30&#xa0;°C, close to the beetle’s optimum temperature. Conversely, two other associated fungi, <i>Graphilbum acuminatum</i> and <i>Ophiostoma</i> cf. <i>clavatum</i>, were more tolerant to higher temperatures, suggesting that these species may be ecologically important as well and facilitate functional redundancy within the beetle’s fungal community.</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

Temperature affects the development of the pine bark beetle Ips acuminatus and the growth of its most common fungal associates

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月28日

查看全文
  • Eva Papek,
  • Elisabeth Ritzer,
  • Peter Baier,
  • Axel Schopf,
  • Dorothea Pöchlauer,
  • Thomas Kirisits,
  • Martin Schebeck

摘要

Bark beetles play a key role in shaping forest ecosystems, and some species are among the most significant disturbance factors in coniferous forests of the Northern Hemisphere. Their ability to successfully infest living trees is closely linked to mutualistic relationships with microorganisms that help to overcome host defences or provide essential nutrients. For a deeper understanding of the effects of climate change-related temperature alterations on these mutualistic interactions, the present study investigated how temperature affects the development of the pine bark beetle Ips acuminatus and the mycelial growth of its most common ophiostomatoid fungal associates. Key thermal performance parameters of fungi and beetles were determined using laboratory experiments and temperature-dependent development and growth rate models. Temperature had a significant effect on insect development and fungal growth. All fungal species tested on malt extract agar had lower temperature optima (~ 22–28 °C) and thermal thresholds (lower thresholds: ~ 3–6 °C; upper thresholds: ~ 27–33 °C) than I. acuminatus tested in logs (lower threshold: 8.1–9.6 °C; optimum temperature: 30.3 °C; upper threshold: 36.2 °C). Tolerance to high temperatures varied among fungal species. Particularly, the proposed key fungal symbiont, Ophiostoma macrosporum, suggested to be essential for the nutrition of larvae and beetles, showed strong growth reduction at 30 °C, close to the beetle’s optimum temperature. Conversely, two other associated fungi, Graphilbum acuminatum and Ophiostoma cf. clavatum, were more tolerant to higher temperatures, suggesting that these species may be ecologically important as well and facilitate functional redundancy within the beetle’s fungal community.