从最后一次冰川盛期到人类世安第斯树种栖息地适宜性和热点避难所的分布变化

IF 0.9 Q4 ECOLOGY Neotropical Biodiversity Pub Date : 2021-01-01 DOI:10.1080/23766808.2021.1957652
Alejandra I. Domic, J. Capriles
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引用次数: 3

摘要

摘要预测气候变化对安第斯树木分布的影响对于了解物种如何应对气候变化和评估其对持续气候危机的抵御能力至关重要。在这里,古分布模型用于评估安第斯山脉中部末次冰川盛期(LGM)、全新世中期(MH)和人类世期间17种Polylepis物种的分布变化。物种分布模型(SDM)是通过使用Maxent结合存在记录和当前气候条件计算的,并预测到LGM(约22000年BP)、MH(约6000年BP)和人类世(1970–2000)的三种气候情景中。随后,通过对所有研究物种的LGM、MH和人为条件的适当栖息地进行交叉,确定了当前的避难所热点。LGM和MH的SDM显示,与人类世相比,大多数物种的气候适宜栖息地缩小。目前确定了四个避难所热点:秘鲁的科迪勒拉中部、喀喀湖流域、玻利维亚的科迪勒拉西部和智利北部。总的来说,SDM与花粉记录中提出的模式一致,部分与现有的系统地理学研究一致。目前的热点地区是保护Polylepis和相关生物群的非常重要的地区。这项研究有助于了解安第斯树种数千年来因气候变化而发生的分布变化,并确定未来保护战略的关键保护区。
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Distribution shifts in habitat suitability and hotspot refugia of Andean tree species from the last glacial maximum to the Anthropocene
ABSTRACT Forecasting the effects of climate change on the distribution of Andean trees (Polylepis, Rosaceae) is important to understand how species respond to climate variability and to assess their resilience to the ongoing climate crisis. Here, paleodistribution modelling is used to assess distribution shifts of 17 Polylepis species during the Last Glacial Maximum (LGM), mid-Holocene (MH), and the Anthropocene in the central Andes. Species distribution models (SDMs) were computed by combining presence records and current climatic conditions using Maxent and projected onto three climatic scenarios for the LGM (~22,000 yr BP), the MH (~6,000 yr BP), and the Anthropocene (1,970–2,000). Subsequently, current refugia hotspots were identified by intersecting suitable habitat over the LGM, MH, and anthropogenic conditions for all the studied species. SDMs for the LGM and MH showed a contraction of climate suitable habitat for most of the species in comparison to the Anthropocene. Four current refugia hotspots were identified: central Cordillera of Peru, Lake Titicaca basin, western Cordillera of Bolivia, and northern Chile. In general, SDMs were consistent with patterns proposed with pollen records, and partially with available phylogeographic studies. Current hotspots are highly important areas for the conservation of Polylepis and associated biota. This study assists in understanding distribution shifts over millennia of Andean tree species in response to climate change and identifying key conservation areas for the delineation of future conservation strategies.
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来源期刊
Neotropical Biodiversity
Neotropical Biodiversity Environmental Science-Ecology
CiteScore
1.80
自引率
0.00%
发文量
39
审稿时长
24 weeks
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