Scholarlink

<p>The processes and mechanisms that determine the long-term dynamics of bird assemblages are not well understood. Previous studies of bird assemblage have found that variability in the relative abundances of species increase with time and that species reordering may be one of the main mechanisms determining long-term dynamics. In this study, we examined the bird assemblage dynamics in a primeval beech-fir forest in the Šrámková National Nature Reserve in the Western Carpathians, Slovakia, over 20 years (1997−2016). Our main goal was to identify the main mechanisms involved in dynamics of this bird assemblage. This is the first analysis of the temporal stability of a bird assemblage within a primeval forest for conservation monitoring in Slovakia. Population abundances within a 27.5-ha census plot were estimated by the territory mapping method. We analyzed turnover by three metrics (total, appearances, and disappearances). We also computed mean rank shifts, Hellinger distances and Sørensen and Horn dissimilarity indices, and subjected these metrics to a time lag analysis (TLA), based on null model testing, to reveal general trends over time. Based on the TLA, mean rank shifts had the highest slopes, indicating the relative importance of species reordering in assemblage dynamics. Species turnover was also important, as indicated, by relatively high values of all turnover metrics. TLA of Hellinger distances showed a non-significant pattern over time, suggesting that the bird assemblage was stable and fluctuated around zero or randomly without autocorrelation. TLA computed from the Sørensen and Horn indices yielded significant, but only weakly increasing slopes, indicating slightly increasing species composition and dominance dissimilarity over time. Based on the results of the TLA of Hellinger distances, we found that our assemblage was more stable than those reported from other studies of bird assemblages in primeval forests. We identified mean rank shifts and species turnover as the main mechanisms shaping the dynamics of this assemblage. Our results highlight the high conservation and scientific value of this primeval forest bird assemblage as a native biodiversity hotspot in the Carpathians Mts.</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

Species reordering and turnover shape long-term dynamics of a primeval temperate forest breeding bird assemblage

  • 期刊论文

  • 发表日期：

    2025年10月1日

查看全文
  • Martin Korňan,
  • Marek Svitok

摘要

The processes and mechanisms that determine the long-term dynamics of bird assemblages are not well understood. Previous studies of bird assemblage have found that variability in the relative abundances of species increase with time and that species reordering may be one of the main mechanisms determining long-term dynamics. In this study, we examined the bird assemblage dynamics in a primeval beech-fir forest in the Šrámková National Nature Reserve in the Western Carpathians, Slovakia, over 20 years (1997−2016). Our main goal was to identify the main mechanisms involved in dynamics of this bird assemblage. This is the first analysis of the temporal stability of a bird assemblage within a primeval forest for conservation monitoring in Slovakia. Population abundances within a 27.5-ha census plot were estimated by the territory mapping method. We analyzed turnover by three metrics (total, appearances, and disappearances). We also computed mean rank shifts, Hellinger distances and Sørensen and Horn dissimilarity indices, and subjected these metrics to a time lag analysis (TLA), based on null model testing, to reveal general trends over time. Based on the TLA, mean rank shifts had the highest slopes, indicating the relative importance of species reordering in assemblage dynamics. Species turnover was also important, as indicated, by relatively high values of all turnover metrics. TLA of Hellinger distances showed a non-significant pattern over time, suggesting that the bird assemblage was stable and fluctuated around zero or randomly without autocorrelation. TLA computed from the Sørensen and Horn indices yielded significant, but only weakly increasing slopes, indicating slightly increasing species composition and dominance dissimilarity over time. Based on the results of the TLA of Hellinger distances, we found that our assemblage was more stable than those reported from other studies of bird assemblages in primeval forests. We identified mean rank shifts and species turnover as the main mechanisms shaping the dynamics of this assemblage. Our results highlight the high conservation and scientific value of this primeval forest bird assemblage as a native biodiversity hotspot in the Carpathians Mts.