More endemic birds occur in regions with stable climate, more plant species and high altitudinal ran

来源 :鸟类学研究(英文版) | 被引量 : 0次 | 上传用户:wxpsth
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Background: Geographical distribution of endemic species and its multiple scale drivers are an important topic in biodiversity conservation, because these species are especially vulnerable to climate change and habitat degradation, and therefore have high conservation priority. Here, for the first time, we simultaneously linked glacial-interglacial climate change, contemporary climate, plant species richness and altitudinal range with endemic bird distribution in China. Methods: Ordinary least squares models and simultaneous autoregressive models were used to assess the associations between endemic bird richness, endemic bird ratio and each explanatory variable. Structural Equation Models were also performed to test the direct and indirect effects of these variables on endemic bird richness and endemic bird ratio. Results: Higher endemic bird richness and endemic bird ratio occurred in regions with stable glacial-interglacial temperature, i.e., southwest China. Plant species richness and altitudinal range were also positively correlated with endemic bird richness and endemic bird ratio. Glacial-interglacial temperature change, contemporary precipitation, plant species richness and altitudinal range were all included in the best combination of variables for endemic bird richness. Importantly, glacial-interglacial temperature change had strong direct effects on both endemic bird richness and endemic bird ratio, while plant species richness only had a direct effect on endemic bird richness. Conclusions: Our results indicate that endemic birds in China concentrate in southwest regions where there are stable glacial-interglacial temperature, more plant species and larger altitudinal range. Notably, while stable climate has strong direct effects on both endemic bird richness and endemic bird ratio, plant species may affect endemic bird richness through its effect on overall bird species richness. Importantly, the recent anthropogenic activities have also significantly intensified in this region, which would pose huge challenge for biodiversity conservation in China.
其他文献
Background: As one of the reproductive strategies adopted by bird species, variation in investment in egg production and its influencing factors are important a
近年来,有机产业在中国蓬勃发展,全国各地从事有机生产与经营的企业如雨后春笋般飞速增长。据国家认监委统计,截至2014年初,全国已有6051家企业获得有机产品认证,证书达9957张。然而,有机产业和有机认证的发展离不开有机农业,作为中国农业部专门从事有机农业运动发展和有机产品认证、管理的机构,中绿华夏有机食品认证中心(以下简称中绿华夏)对中国有机事业的发展责无旁贷。如何更好地服务于企业,为认证企业带
Background: Parrots (Psittacidae Family) are one of the most colorful groups of birds in the world, their colors produced both structurally and via unusual pigm
政府随后发起了一项名为MySuper的计划,将运营成本尽可能地降低。而LP们也因而对此类资产的安全性树立起了信心,不再为风险问题忧虑。 The government subsequently launche
国庆长假期间,市场内经销肉类、海鲜类的业主都积极组织货源来充实自己的柜台,猪肉、羊肉、牛肉的货源大都来自当地或达茂旗、土右旗、乌审旗等周边地区,交易大厅内的顾客也是川流不息,比平日增加不少。截至10月8日,市场内猪肉批发价为每公斤26元,牛肉批发价为每公斤52元,羊肉批发价为每公斤36元,白条鸡批发价为每公斤15元,鸡蛋批发价为每公斤8.6元,肉类交易量较上周上涨29.17%。海鲜类的价格比前期略
摘要: 在山区常会遇到地基软硬不均的问题,这是由于山区地形高低不平、基岩表面起伏变化大、地质成分也比较复杂的原因。地基和基础是建筑物的根本,地基的处理和基础造型更直接关系到建筑物的安危,本文主要阐述山区地区建筑地基的处理方法,以供参考。  关键词:山区地基;处理方法;基础施工;技术    1 前言  山区地基与平原地区相比,常会遇到滑坡、崩塌、岩溶、土洞和泥石流等不良地质现象,给建筑物造成直接或潜
期刊
摘要:地裂缝在.地铁施工中是很常见的,只有充分地认识和了解,才能在施工中做到有的放矢,从设计上筹划上尽可能地规避风险,在实际施工中也有充足的风险应对思想准备,力争隧道安全顺利通过地裂缝带。  关键词:地裂缝施工工程  1、概述  1.1、工程情况  本工程为左线长303.029m,右线长337.213m,为左右并行的双线单洞大跨隧道,隧道开挖尺寸为10m(跨度)×10.2m(高度),左右线间距14
期刊
本文提出结合云模型和改进均方差的协同过滤推荐方法,为团购网站的用户提供个性化推荐。该方法首先通过已有的用户日志数据,模拟用户对商品的评分,构建用户-商品评分矩阵。在
摘要:目前,我省油路病害多,一些国省道路面出现了不同程度的破损,这不仅影响了交通状况,也与我们实现公路“畅、洁、绿、美”的要求相悖。基于我省经济发展现状,进行彻底翻修又面临资金不足的问题,故应根据需要采用修补、灌缝、罩面加铺及翻修等不同的方法进行科学养护。另外,油路在不同季节都有其变化规律,因此,对油路养护有必要进行一些探索和研究。  一、油路后期病害分析  油路后期病害主要有坑槽、网裂、沉陷、麻
期刊
六倍体普通小麦 (TriticumaestivumL .)是由四倍体小麦 (T .turgidumL .)与二倍体节节麦 (AegilopstanschiiCoss.)天然杂交然后通过染色体自然加倍形成的异源多倍体。这一起