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A CONSERVATION ASSESSMENT OF CENTRAL AMERICAN VEGETATION AND ecoregions

自然资源学报 1999年第4期14卷 300-306页

作者： LI Xiao jun, Timothy Boucher, Roger Sayre(Conservation Science and Stewardship Department,Latin America and the Caribbean Division The Nature Conservancy,1815 North Lvnn Street Arlington,VA 22209,USA Open Research Laboratory of Environmental Changes and Latin America and the Caribbean Division the Nature Conser 美国

A comprehensive,standardized,and thematically appropriate map of Central American vegetation and landcover types was developed by classifying the remote sensed imagery(AVHRR)1km2 resolution using advanced digital image processing routines and expertise.The map identifies 17 remaining natural vegetation types.The classification accuracy of the map is estimated to exceed 80%.Using a GAP analysis approach,a map of existing and proposed protected areas was overlaid on the vegetation map to analyze the protection status of vegetation types and ecoregions.

关键词： landscape level biodiversity AVHRR GAP analysis ecoregions

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Historical and current climates affect the spatial distribution of herbivorous tree insects in China

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林业研究:英文版 2023年第5期34卷 1307-1321页

作者： Feixue Zhang Chunjing Wang Jizhong Wan State Key Laboratory of Plateau Ecology and Agriculture Qinghai UniversityXining 810016People’s Republic of China College of Agriculture and Animal Husbandry Qinghai UniversityXining 810016People’s Republic of China

Historical and current climate impacts reshape the evolutionary trajectory and ecological dynamics of entire vegetative communities,which can drive insect species distribution.Understanding the spatial distribution of insects can enhance forest management effectiveness.The effects of historical and current climates in the spatial distribution of herbivorous tree insects in China were explored.A species distribution model simulated insect spatial distribution based on 596 species and the distribution probability and richness of these species were assessed in forest ecoregions.The explanatory power of the historical climate was stronger than that of the current climate,particularly historical annual precipitation and annual mean temperatures,for the distribution of herbivorous insects.Under both historical and current climatic conditions,herbivorous tree insects were and are mainly distributed in the North China Plain and the middle and lower reaches of the Yangtze River Plain,namely in the Huang He Plain mixed forests,Changjiang Plain evergreen forests,and Sichuan Basin evergreen broadleaf forests.The Yunnan-Guizhou Plateau and northeast China are regions with large impact differences between historical and current climates.The findings of this study provide valuable insights into herbivorous insect responses to sustained climate change and may contribute to long-term biodiversity conservation activities.

关键词： Bioclimatie variables ecoregions Last glacial maximum Spatial distribution Species distribution model Herbivorous tree insects

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Investigating bee dietary preferences along a gradient of floral resources:how does resource use align with resource availability?

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Insect Science 2021年第2期28卷 555-565页

作者： Tyler T.Kelly Elizabeth Elle Evolutionary and Behavioural Ecology Research Group Department of Biological SciencesSimon Fraser UniversityBurnabyCanada

Bee dietary preferences,or the floral resources that they consistently collect,likely impact where a species can persist.For this reason it is likely that bee dietary preferences are dependent upon the composition of the plant community.In this study,we evaluated floral visits and pollen loads of the mining bee,Andrena angustitarsata Viereck,across a 630 km north-south range to understand dietary preferences along a floral resource gradient.Previous research,in a more geographically limited area,suggested this species was an eclectic oligolege on predominantly Apiaceae and in part Rosaceae.In the present study we found the species predominately visited and collected pollen from Apiaceae and Rosaceae,but visited 12 flower families and collected pollen from 32,distinguishing them as generalist foragers.The frequency of Apiaceae pollen on the bees and the species-level specialization index(a measure of visit specialization)were higher in regions with higher Apiaceae abundance.In addition Apiaceae and Rosaceae were the only plant families significantly preferred for pollen collection,regardless of floral abundance.We conclude that across our study region A.angustitarsata has a generalist dietary breadth,but also has dietary preference for Apiaceae and Rosaceae.Our study indicates that while bees may overall make generalist foraging decisions they may still prefer and likely benefit from selecting fewer flower taxa.

关键词： andrenidae dietary breadth ecoregions oak-savanna pollen specialization

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Changes in climate regimes over China based on a high-resolution dataset

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Science Bulletin 2019年第6期64卷 377-379页

作者： Wei Huang Jingjing Yan Chang Liu Tingting Xie Key Laboratory of Western China’s Environmental Systems (Ministry of Education) College of Earth and Environmental Sciences Lanzhou University Central Asia Center for Atmospheric Science Research China Meteorological Administration Department of Geosciences University of Arkansas

During the 20th century the global climate has been shifted towards warmer and drier regimes, mainly due to anthropogenic warming [1,2]. Climate changes can notably disrupt the environment and ecosystems. To evaluate the impacts of climate change on ecoregions, the Kdppen-Trewartha (K-T) climate classification [3] is widely used because it was constructed on the basis of surface vegetation. The K-T classification system combines temperature, precipitation, and their seasonality into a single metric. Six major climate types and several sub-climate types are defined (A: tropical, B: dry, C: subtropical, D: temperate, E: subpolar, F: polar). Each K-T climate type is consistent with certain prevalent plant species. Definitions and criteria of K-T climate types were outlined by Feng et al.[4].

关键词： climate has been shifted change on ecoregions climate types

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