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<p>The ecomorphology of a group of Steninae rove beetles from Northern Thailand was analysed using phylogenetically informed comparative methods. Links were identified between micromorphological features, their associated performance consequences (in terms of prey-capture and tarsal attachment), and habitat niche differentiation. Ancestral character reconstruction revealed evolutionary trends. Eye size appeared to be involved in a sensory trade-off with antenna length. While most morphological traits conformed best to a Brownian motion model of trait evolution (i.e. a neutral model), others were better explained by Ornstein–Uhlenbeck or Early Burst models. Low phylogenetic signals were found in body, antenna, and leg length, as well as in tarsus morphology, supporting the idea that these traits underwent convergent adaptive radiation. Similarly, low phylogenetic signal was observed in traits describing the adhesive paraglossae in <i>Stenus</i>, reflecting their distinct morphological types. In contrast, habitat niche width showed a high phylogenetic signal, whereas elevational niche width appeared phylogenetically labile. In multivariate morphospace, <i>Dianous</i> and <i>Stenus</i> occupy largely non-overlapping regions, revealing a pattern consistent with niche complementarity. In Steninae - and especially in <i>Stenus</i> - the exploration of vertical structures has been facilitated by the widening of the tarsi, a trait associated with an increase in habitat niche width. Overall, the findings are consistent with a pattern of adaptive radiation, in which ecomorphological traits exhibit varying degrees of evolutionary lability.</p>

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Ecomorphological disparity in closely related mountainous tropical Thai rove beetles (Coleoptera, Staphylinidae, Steninae): linking morphology, ecology, and evolution

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月13日

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  • Oliver Betz,
  • Florian Huels,
  • Daniela Lena Wiese,
  • Torina Wunder,
  • Wichai Srisuka,
  • Melina Frenzel,
  • Tamara Ayoub,
  • Monika Meinert,
  • Volker Puthz

摘要

The ecomorphology of a group of Steninae rove beetles from Northern Thailand was analysed using phylogenetically informed comparative methods. Links were identified between micromorphological features, their associated performance consequences (in terms of prey-capture and tarsal attachment), and habitat niche differentiation. Ancestral character reconstruction revealed evolutionary trends. Eye size appeared to be involved in a sensory trade-off with antenna length. While most morphological traits conformed best to a Brownian motion model of trait evolution (i.e. a neutral model), others were better explained by Ornstein–Uhlenbeck or Early Burst models. Low phylogenetic signals were found in body, antenna, and leg length, as well as in tarsus morphology, supporting the idea that these traits underwent convergent adaptive radiation. Similarly, low phylogenetic signal was observed in traits describing the adhesive paraglossae in Stenus, reflecting their distinct morphological types. In contrast, habitat niche width showed a high phylogenetic signal, whereas elevational niche width appeared phylogenetically labile. In multivariate morphospace, Dianous and Stenus occupy largely non-overlapping regions, revealing a pattern consistent with niche complementarity. In Steninae - and especially in Stenus - the exploration of vertical structures has been facilitated by the widening of the tarsi, a trait associated with an increase in habitat niche width. Overall, the findings are consistent with a pattern of adaptive radiation, in which ecomorphological traits exhibit varying degrees of evolutionary lability.