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Conservation of Britain’s biodiversity: Hieracium angustatiforme, Small-leaved Hawkweed (Asteraceae) 英国生物多样性的保护:小叶山楂(菊科)
Pub Date : 2021-07-26 DOI: 10.33928/BIB.2021.03.168
T. Rich
The conservation status of Hieracium angustatiforme P.D. Sell & C. West (Asteraceae), Small-leaved Hawkweed, has been assessed. It is a rare endemic restricted to the Brecon Beacons, Wales. Only one population of c.330-430 plants is known in Craig Cerrig-gleisiad National Nature Reserve, and it has not been refound at three other sites. Hieracium angustatiforme is assessed as ‘Critically Endangered’ under IUCN (2001) threat criteria.
对小叶山楂(菊科)的保护现状进行了评价。这是一种罕见的地方性疾病,仅限于威尔士的布雷肯比肯斯。在克雷格·塞里格-格列西亚国家自然保护区,只有一种c.330-430的植物被发现,而且在其他三个地方也没有被发现。根据世界自然保护联盟(2001年)的威胁标准,鬣蜥被评估为“极度濒危”。
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引用次数: 0
Conservation of Britain’s biodiversity: Distribution and status of the British endemic Hieracium subbritannicum, Limestone Hawkweed (Asteraceae) 英国生物多样性的保护:英国特有的石菖蒲、石灰岩山楂(菊科)的分布和地位
Pub Date : 2021-07-26 DOI: 10.33928/bib.2021.03.216
S. Lee, T. Rich
Hieracium subbritannicum, Limestone Hawkweed, is a British endemic plant. Field surveys indicate at least 745 plants in six semi-upland sites in Wales, and it has gone from seven sites on Old Red Sandstone and in the Wye Valley in England. The IUCN threat status is ‘Vulnerable’.
石灰石山楂是英国特有植物。实地调查表明,在威尔士的六个半高地地区,至少有745种植物,它已经从老红砂岩和英格兰怀伊河谷的七个地点消失了。世界自然保护联盟的威胁状态是“脆弱”。
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引用次数: 0
Identification and taxonomy of Betula (Betulaceae) in Great Britain and Ireland 标题英国和爱尔兰桦树的鉴定和分类
Pub Date : 2021-07-26 DOI: 10.33928/BIB.2021.03.099
A. Amphlett
Floras and identification guides typically do not list the full range of identification features that discriminate between Betula pendula Roth and B. pubescens Ehrh., and some accounts contain errors. Discriminatory identification features are described and illustrated. Introgression from the diploid, B. pendula into B. pubescens is widespread. It also occurs from B. nana L. into B. pubescens, but obviously introgressed examples of the latter are probably rare. Betula pubescens presents the greatest unresolved identification difficulties. Trees identified as B. pubescens subsp. celtiberica (Rothm. & Vasc.) Rivas Mart., particularly in Wales, may be part of the variation within British B. pubescens, due to introgression from B. pendula. The most widespread of the small-leaved forms of B. pubescens is correctly named var. fragrans Ashburner & McAll. Several misapplied names have been given to this taxon, most recently subsp. tortuosa (Ledeb.) Nyman, which does not occur in Europe. Not all small-leaved B. pubescens are var. fragrans; some examples show clear signs of introgression from B. nana, and may be referable to the northern var. pumila (L.) Govaerts.
植物区系和鉴定指南通常不会列出区分白桦(Betula pendula Roth)和白桦(B. pubescens Ehrh)的全部鉴定特征。,部分账户存在错误。描述和说明了歧视性识别特征。二倍体B. pendula向B. pubescens的渗透是普遍的。它也发生在小分枝杆菌娜娜L.到短毛小分枝杆菌,但后者的明显渗入的例子可能是罕见的。短毛桦树是最大的未解决的鉴定难题。被鉴定为短毛棒状木的树木。celtiberica (Rothm。& Vasc)。Rivas集市。特别是在威尔士,可能是英国短柔毛杆菌变异的一部分,由于长柔毛杆菌的渗入。最广泛分布的小叶形式的短毛假丝被正确地命名为var. fragrans Ashburner & McAll。这个分类群有几个误用的名字,最近的一次是亚种。tortuosa (Ledeb)。这在欧洲是不存在的。并不是所有的小叶短柔毛属都是异香的;一些例子显示出明显的来自白僵菌的渗透迹象,可能与北方的白僵菌(L.)有关。Govaerts。
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引用次数: 2
Conservation status of the rare endemic Centaurium tenuiflorum subsp. anglicum, English Centaury (Gentianaceae) 珍稀特有种半人马座的保护现状。英国世纪龙胆属(龙胆科)
Pub Date : 2021-07-26 DOI: 10.33928/bib.2021.03.161
Elizabeth Downey, D. Pearman, T. Rich
The status of the rare English endemic Centaurium tenuiflorum subsp. anglicum, English Centaury, has been assessed from field surveys in 2020 and compared against previous population counts. In Dorset, 16 populations with c.25,800 plants occurred and there was no evidence of overall decline. It was not refound in one site in the Isle of Wight. The IUCN threat status is ‘Least Concern’.
英国珍稀特有植物半人马座的现状。anglicum,即英国世纪,已经从2020年的实地调查中进行了评估,并与之前的人口统计进行了比较。在多塞特郡,出现了16个种群,约25,800株植物,没有证据表明总体下降。它没有在怀特岛的一个地方被发现。世界自然保护联盟的威胁状态是“最不关注”。
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引用次数: 0
Current status of the rare British endemic Gentianella amarella subsp. occidentalis, Dune Gentian (Gentianaceae) 罕见的英国特有龙胆亚种的现状。沙丘龙胆(龙胆科)
Pub Date : 2021-07-26 DOI: 10.33928/bib.2021.03.136
Lynley A. Evans, T. Rich
Gentianella amarella subsp. occidentalis, Dune Gentian, is a rare annual of dune slacks endemic to Western Britain. Its current status was compared to historic records. A maximum of 2250 plants were found in ten subpopulations in four sites in 2019-2020. It was not refound in three sites and 15 subpopulations. It is assessed as IUCN threat category ‘Endangered’. Its primary vegetation type is SD14d Salix repens - Campylium stellatum dune slack Festuca rubra subcommunity, within which it favours short, open structure on dry, low nutrient soils. Conservation requires managing and creating its niche in the dune slacks.
龙胆亚属。occidentalis,沙丘龙胆,是一种罕见的沙丘松弛的一年生植物,特有于英国西部。将其现状与历史记录进行了比较。2019-2020年在4个样地的10个亚群中最多发现2250株。在3个地点和15个亚群中未发现。它被世界自然保护联盟列为“濒危”威胁类别。其主要植被类型为SD14d Salix repens - Campylium stellatum dune slack Festuca rubra亚群落,在该亚群落中,它倾向于在干燥、低营养土壤上的短而开阔的结构。保护需要管理和创造沙丘松弛的生态位。
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引用次数: 0
The first British record of Veronica filiformis (Veronicaceae) 维罗妮卡(维罗妮科)在英国的首次记录
Pub Date : 2021-07-26 DOI: 10.33928/bib.2021.03.178
C. Preston
For almost 60 years, accounts of the history of Veronica filiformis Sm. in Britain and Ireland have described how, after an initial record in 1838, it was not recorded again until 1927, after which it spread very rapidly. An investigation of the 1838 record shows that, immediately after its publication, a leading botanist suggested that it was the species now known as V. persica (V. filiformis auct.). It is certainly far too doubtful to be accepted as the first record of V. filiformis in the wild. Once it is rejected, the history of V. filiformis in Britain and Ireland becomes much more straightforward.
近60年来,关于维罗妮卡的历史。英国和爱尔兰的研究人员描述了在1838年首次记录之后,直到1927年才再次记录,此后传播非常迅速。一项对1838年记录的调查显示,在该记录发表后,一位著名的植物学家立即提出,它就是现在所知的桃蚜(V. filiformis auct.)。这当然是非常值得怀疑的,不能被接受为丝状弧菌在野外的第一记录。一旦它被拒绝,丝状弧菌在英国和爱尔兰的历史就变得简单多了。
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引用次数: 0
Arable weeds of the Scottish Borders 苏格兰边境的可耕地杂草
Pub Date : 2021-07-26 DOI: 10.33928/bib.2021.03.152
M. Braithwaite, Luke Gaskell
Many years of fieldwork have led the authors to hypothesise that there is a single relatively species-rich arable weed community present across the Scottish Borders that is best expressed in broad-leaved root crops and in set-aside on imperfectly-drained soils, while the species-poor communities typically found in cereal crops are a degraded form of this. 102 samples have been studied to test this hypothesis and to search for a community typical of slightly calcareous well-drained soils. The community typical of imperfectly-drained soils has been defined and is considered to be a species-rich variant of the NVC OV13 Stellaria media-Capsella bursa-pectoris open habitat community. Species typical of well-drained soils have been shown to be scarce and not to form a distinct community, though they may well have done so in the past.
经过多年的田野调查,作者们假设在苏格兰边境存在着一种相对物种丰富的可耕地杂草群落,这种群落在阔叶根茎作物和排水不完全的土壤中表现得最好,而在谷类作物中发现的物种贫乏群落则是这种群落的退化形式。已经研究了102个样本来验证这一假设,并寻找一个典型的微钙质排水良好的土壤群落。定义了典型的不完全排水土壤群落,并认为该群落是NVC OV13型紫花星-荠菜-胸腹菜开放生境群落的一个物种丰富的变种。排水良好的土壤中典型的物种已经被证明是稀缺的,并且没有形成一个独特的群落,尽管它们在过去很可能已经这样做了。
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引用次数: 0
Geographical patterns in the flora of Cambridgeshire (v.c.29) 剑桥郡植物区系的地理格局(第29节)
Pub Date : 2020-12-07 DOI: 10.33928/bib.2020.02.285
M. Hill, C. Preston, J. Shanklin
Cambridgeshire data collected for the BSBI’s Atlas 2020 project include 347,496 records at monad (1 km) or finer resolution. We used these data to cluster taxa by spherical k-means to produce 21 clusters of taxa with similar patterns of distribution. Some of the clusters correspond to well-defined habitats such as chalk grassland, ancient woodland, traditional fenland, and saline riversides and roadsides. Other clusters were less expected, corresponding to arable clayland, washland (the Ouse and Nene washes), waste ground and garden escapes. There was a cluster of ubiquitous species and another of common arable weeds. The distributions of the clusters are displayed as coincidence maps. Some species are intermediate between two clusters. These can be recognised by their relatively poor goodness of fit to any one cluster. The clusters differ markedly in ecological attributes and whether they include rare or threatened species. We interpret these differences using Ellenberg values and the vascular plant Red List for England.
剑桥郡为BSBI的Atlas 2020项目收集的数据包括347,496条单纳(1公里)或更精细分辨率的记录。利用这些数据对类群进行球形k-means聚类,得到21个分布格局相似的类群。其中一些集群对应于明确的栖息地,如白垩草地、古老林地、传统沼泽、盐碱化的河岸和路边。其他集群则出乎意料,如可耕种的粘土地、洗涤地(Ouse和Nene洗涤地)、荒地和花园逃生地。这里有一丛无处不在的野草,还有一丛普通的可耕地野草。集群的分布显示为重合图。有些种介于两簇之间。这可以通过它们对任何一个簇的相对较差的拟合优度来识别。这些集群在生态属性和是否包括稀有或受威胁物种方面存在显著差异。我们使用Ellenberg值和英国维管植物红色名录来解释这些差异。
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引用次数: 0
The phenology of an urban street flora: a transect study 城市街道植物物候学:样带研究
Pub Date : 2020-02-26 DOI: 10.33928/bib.2020.02.001
C. Preston
Vascular plants in flower along a fixed 3.8 km route in eight streets in a primarily residential area of urban Cambridge, U.K., were recorded at monthly intervals between January 2016 and December 2019. There was a consistent annual pattern over the four years; the number of flowering species was greatest in June or July but there were still appreciable numbers of species flowering when totals were at their lowest in February or March. Five annuals (Capsella bursa-pastoris, Euphorbia peplus, Poa annua, Senecio vulgaris, Stellaria media) and one perennial (Parietaria judaica) were very frequent and flowered from January to December. Perennial species showed greater variation through the year than annual species. In most months the number of flowering British native species exceeded the combined number of archaeophytes and neophytes, but the native total peaked earlier in the summer and then declined more rapidly than that of the introductions. The transect method appeared to be effective in identifying the main annual phenological trends and also revealed the effects of extreme weather on the patterns in some seasons.
2016年1月至2019年12月,在英国剑桥市一个主要住宅区的8条街道上,沿着3.8公里的固定路线记录了维管植物的开花情况。在四年中有一个一致的年度模式;花种数在6、7月最多,但在2、3月花种数最少时仍有一定数量的花种。5种一年生植物(Capsella bursa-pastoris, Euphorbia peplus, Poa annua, Senecio vulgaris, Stellaria media)和1种多年生植物(Parietaria judaica)非常频繁,在1月至12月开花。多年生树种比一年生树种的年际变化更大。在大多数月份,开花的英国本土物种的数量超过了古植物和新生植物的总和,但本土物种的总数在夏季达到顶峰的时间要早于引进物种,然后下降的速度要快于引进物种。样条法可以有效地识别主要的年际物候趋势,并揭示了极端天气对某些季节物候模式的影响。
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引用次数: 0
Temporal changes in distributions and the species atlas: How can British and Irish plant data shoulder the inferential burden? 分布和物种图谱的时间变化:英国和爱尔兰植物数据如何承担推论负担?
Pub Date : 2019-12-14 DOI: 10.33928/bib.2019.01.250
O. Pescott, T. A. Humphrey, P. Stroh, K. Walker
Species distribution atlases often rely on volunteer effort to achieve their desired coverage, an activity now typically discussed, at least in academia, under the general theme of “citizen science”. Such data, however, are rarely without complex biases, particularly with respect to the estimation of trends in species’ distributions over many decades. The data of the Botanical Society of Britain and Ireland (BSBI) are no exception to this, and both careful thought in data aggregation (spatial, temporal, and taxonomic) and appropriate modelling procedures are required to overcome these challenges. We discuss these issues, with a primary focus on the statistical models that have been put forward to adjust for such biases. Such models include the Telfer method, various “reporting rate” approaches based on generalised linear models, the frequency scaling using local occupancy (“Frescalo”) model, occupancy models, and spatial smoothing methods. In each case the strengths and limitations in relation to estimating trends from distribution data with important time-varying biases are assessed. Various properties of BSBI data, in particular the increasing numbers of records at fine spatial and temporal scales over the past century, coupled with a general lack of re-visits to sites at such finer scales and the time-varying biases previously mentioned, imply that methods that can be sensibly applied at coarser levels are likely to be most appropriate for estimating accurate long-term trends in distributions. We conclude that Frescalo, which can be seen as a type of occupancy model where an adjustment for overlooked species is made in relation to spatial rather than temporal replication, whilst simultaneously adjusting for variable regional effort, is currently the most sophisticated tool for achieving this. Although recording community-accepted adjustments to data collection practices may allow for a greater application of occupancy modelling or other approaches in the future, methods that seek accurate trends over the long-term are necessarily limited either to scales at which various properties of the data in hand are most likely to be unbiased, or at which the biases are well enough understood to be modelled accurately.
物种分布地图集通常依靠志愿者的努力来实现其期望的覆盖范围,至少在学术界,这种活动现在通常以“公民科学”为主题进行讨论。然而,这些数据很少没有复杂的偏差,特别是在对几十年来物种分布趋势的估计方面。英国和爱尔兰植物学会(BSBI)的数据也不例外,在数据汇总(空间、时间和分类)和适当的建模程序中都需要仔细考虑,以克服这些挑战。我们讨论这些问题,主要集中在已经提出的统计模型,以调整这种偏见。这些模型包括Telfer方法、基于广义线性模型的各种“报告率”方法、使用本地占用率(Frescalo)模型的频率缩放、占用率模型和空间平滑方法。在每种情况下,评估了从具有重要时变偏差的分布数据估计趋势的优势和局限性。BSBI数据的各种特性,特别是在过去一个世纪中在精细时空尺度上的记录数量不断增加,加上在这种精细尺度上普遍缺乏对站点的重新访问,以及前面提到的时变偏差,意味着可以明智地应用于粗糙水平的方法可能是最适合准确估计分布的长期趋势的方法。我们得出的结论是,Frescalo可以被视为一种占用模型,其中对被忽视的物种进行了空间而不是时间复制的调整,同时调整了可变的区域努力,是目前实现这一目标的最复杂的工具。虽然记录社区接受的对数据收集实践的调整可能允许在未来更广泛地应用占用模型或其他方法,但寻求长期准确趋势的方法必然受到限制,要么是手头数据的各种属性最有可能是无偏的尺度,要么是对偏差有足够的了解以便准确建模的尺度。
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引用次数: 15
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British & Irish Botany
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