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The Importance of Forest-Nonforest Transition Zones for Avian Conservation in a Vegetation Disturbance Gradient in the Northern Neotropics
Tropical Conservation Science ( IF 1.7 ) Pub Date : 2021-03-31 , DOI: 10.1177/19400829211008087
Dallas R. Levey 1, 2 , Alejandro Estrada 2 , Paula L. Enríquez 3 , Adolfo G. Navarro-Sigüenza 4
Affiliation  

Tropical landscape connectivity and matrix quality near large stands of primary forest are important factors that dictate biodiversity trends in communities. Suitable matrix management surrounding primary forest may help conserve biodiversity, but areas with poor matrix management need attention to determine their long-term viability to support native levels of biodiversity. We examined variations in species and functional diversity and community composition using point-count surveys placed in preserved (PRES), transition (TRA), and disturbed (DIS) areas according to percent land cover of forest and cattle pasture along a human disturbance gradient in the northern Neotropics during an 8 month period from 2019–2020. We expected the gradient of human disturbance to drive species diversity loss of forest specialists from PRES to DIS, resulting in changes to functional diversity and community composition. We detected 228 species overall, with 163 in PRES (40 unique species), 159 in TRA (9 unique species), and 152 in DIS (20 unique species). TRA supported an avian community with shared aspects of PRES and DIS, leading to the highest functional, Shannon (85.8 estimated species), and Simpson (57.9 estimated species) diversity. Higher diversity of open-area specialists in TRA and DIS has led to shifts in functional traits and different species and functional community compositions relative to PRES. Land management in Neotropical human-modified landscapes must focus on increasing habitat quality in remnant forest fragments in the vicinity of large stands of primary forest to prevent species and ecosystem service loss from preserved areas and the distancing of local community compositions.



中文翻译:

北部新热带地区植被扰动梯度中森林-非森林过渡带对鸟类保护的重要性

大型原始林附近的热带景观连通性和基质质量是决定社区生物多样性趋势的重要因素。围绕原始森林进行适当的基质管理可能有助于保护生物多样性,但是基质管理不善的地区需要注意确定其长期生存能力,以支持当地生物多样性水平。我们根据沿人类干扰坡度的森林和牛牧场的土地覆盖率,通过对保存区(PRES),过渡区(TRA)和受干扰区(DIS)进行了点计数调查,检查了物种,功能多样性和群落组成的变化。北部新热带在2019–2020年的8个月内。我们预计人为干扰的梯度会导致森林专家的物种多样性从PRES转移到DIS,导致功能多样性和社区组成的变化。我们总共检测到228种,其中PRES有163种(40种独特种),TRA 159种(9种独特种)和DIS 152种(20种独特种)。TRA支持具有PRES和DIS共享方面的鸟类群落,从而导致功能性最高,香农(估计的物种为85.8)和辛普森(估计的物种为57.9)的多样性。相对于PRES,TRA和DIS的开放区域专家的更高多样性导致了功能性状以及不同物种和功能社区组成的变化。

更新日期:2021-03-31
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