New Journal of Botany最新文献_第10页

Discussion of the challenges associated with recognising infra-specific variation in a hierarchical system of classification, illustrated using two colour forms of Lathraea clandestina 讨论在等级分类系统中识别次等变异所面临的挑战，并以两种不同颜色的黑草为例

New Journal of Botany Pub Date : 2014-04-01 DOI: 10.1179/2042349714Y.0000000037

J. Armitage

引用次数: 2

Native dominants in British woodland – a potential cause of reduced species-richness? 英国林地的本土优势——物种丰富度降低的潜在原因?

New Journal of Botany Pub Date : 2013-12-01 DOI: 10.1179/2042349713Y.0000000028

R. Marrs, K. Kirby, M. G. Duc, H. Mcallister, S. Smart, J. Oksanen, R. Bunce, P. Corney

{"title":"Native dominants in British woodland – a potential cause of reduced species-richness?","authors":"R. Marrs, K. Kirby, M. G. Duc, H. Mcallister, S. Smart, J. Oksanen, R. Bunce, P. Corney","doi":"10.1179/2042349713Y.0000000028","DOIUrl":"https://doi.org/10.1179/2042349713Y.0000000028","url":null,"abstract":"Abstract The invasion of native habitats by alien species has received considerable attention. However, in Britain high levels of dominance by a small number of aggressive native plant species may have an equal, or greater, impact on the richness of native woodlands. Here, we examine this hypothesis by modelling the realized niche of native-dominant species along the principal coenocline of British woodlands, and examined niche overlaps with 78 woodland specialist species and two alien species. Four native species had a much greater cover than all other field-layer species, and between them they entirely covered the response range of all other field-layer species, replacing one another along the coenocline. These findings, combined with autecological information suggest that Hedera helix, Mercurialis perennis, Pteridium aquilinum and Rubus fruticosus have the potential to become ‘over-dominant’ and perhaps may impinge on other field-layer species. Our results also identified which field-layer species are likely to be impacted by a change in abundance of each of these dominant-species, and as such, provide a novel quantitative method of risk assessment to aid conservation policy. Understanding how woodland communities remain diverse, even in the presence of aggressive native species, may provide insights into how the impact of exotic invasive species can be managed.","PeriodicalId":19229,"journal":{"name":"New Journal of Botany","volume":"310 1","pages":"156 - 168"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82546878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

A contribution towards the identification of the giant hogweed species (Heracleum, Apiaceae) naturalised in the British Isles with comments concerning their furanocoumarin content 对归化于不列颠群岛的巨型猪草(Heracleum, Apiaceae)鉴定的贡献，并对其呋喃香豆素含量进行了评论

New Journal of Botany Pub Date : 2013-12-01 DOI: 10.1179/2042349713Y.0000000031

A. Denness, J. Armitage, A. Culham

引用次数: 5

Six new species of British Hieracium (Asteraceae) 英国石竹属(菊科)六新种

New Journal of Botany Pub Date : 2013-12-01 DOI: 10.1179/2042349713Y.0000000030

D. J. Mccosh

引用次数: 1

The floristics of contrasting grazed-down Scottish moorland sites initially dominated by heather (Calluna vulgaris) 对比放牧过的苏格兰沼地的植物区系，最初主要是石南花(Calluna vulgaris)

New Journal of Botany Pub Date : 2013-12-01 DOI: 10.1179/2042349713Y.0000000032

D. Welch

{"title":"The floristics of contrasting grazed-down Scottish moorland sites initially dominated by heather (Calluna vulgaris)","authors":"D. Welch","doi":"10.1179/2042349713Y.0000000032","DOIUrl":"https://doi.org/10.1179/2042349713Y.0000000032","url":null,"abstract":"Abstract Vegetation and herbivore usage at three moorland sites have been monitored since 1969/1970. Heavy grazing soon caused Calluna to be replaced by graminoid species, and this paper is concerned mostly with the floristics of the new grasslands observed over the last 20–23 years of the study. Compositional changes in this period were minor, with no change in the best-fit allegiances to NVC vegetation types. At one site where the livestock were restricted to a relatively small range within which some reseeding occurred, the vegetation belonged to NVC Lolium-Cynosurus grassland MG6b despite not having been ploughed. At a second site the vegetation was NVC Agrostis-Festuca-Galium grassland U4d with much Luzula multiflora. At the third site the vegetation was NVC U4a but fairly rich in species including some of NVC Festuca-Agrostis-Thymus grassland CG10. This last site has conservation value due to both the rarity of the grassland type in NE Scotland and the occurrence of rare angiosperms. The driver of change at the three sites was thought to be the grazing exerted, and no evidence was found of species composition reacting to climate change or nitrogen deposition.","PeriodicalId":19229,"journal":{"name":"New Journal of Botany","volume":"58 1","pages":"169 - 177"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86436259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The first report of an alloheptaploid from the genus Fragaria (Rosaceae) 蔷薇亚属异七倍体首次报道

New Journal of Botany Pub Date : 2013-12-01 DOI: 10.1179/2042349713Y.0000000033

H. Nosrati, A. Price, P. Gerstberger, C. Wilcock

{"title":"The first report of an alloheptaploid from the genus Fragaria (Rosaceae)","authors":"H. Nosrati, A. Price, P. Gerstberger, C. Wilcock","doi":"10.1179/2042349713Y.0000000033","DOIUrl":"https://doi.org/10.1179/2042349713Y.0000000033","url":null,"abstract":"Abstract Hybrid recognition in the genus Fragaria (strawberry, Rosaceae) is difficult when based on morphological characteristics since there is great similarity among Fragaria species, even between different ploidy levels. This study aimed to identify and characterise an alloheptaploid hybrid (2n = 7x = 49) Fragaria for the first time in the genus from Europe (Germany, Bavaria) using different techniques. The hybrid was documented based on the evidence obtained from ploidy levels using flow cytometric measurement of nuclear DNA content, identification of the parental origin using 14 RAPD primers, fertility assessment from artificial crosses and fruit set level. RAPD analysis showed that the hybrid shared five species-specific markers with diploid F. vesca, and three with hexaploid F. moschata, indicating these species to be the most likely parents. The mean fluorescent intensity reflected by nuclear DNA in the putative hybrid (703) fell within the range accepted for heptaploidy in Fragaria, while the corresponding values for the putative parental species were 232 and 622. We concluded that an unreduced gamete from F. moschata and a normal gamete of F. vesca were involved in the formation of this hybrid. The hybrid produced 15 flowers during a period of over 2·5 years in the glasshouse, of which four set berries. Six flowers of the putative hybrid when hand-pollinated with pollen of F. moschata produced five berries. This study shows that allopolyploidy is still active in the evolution and speciation of the genus Fragaria.","PeriodicalId":19229,"journal":{"name":"New Journal of Botany","volume":"22 1","pages":"205 - 209"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86052909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Plant records 工厂的记录

New Journal of Botany Pub Date : 2013-12-01 DOI: 10.1179/2042348913Z.00000000041

引用次数: 0

Scanning electron micrographs of leaves of British Carex species, 1. Introduction and some common sedges 英国苔属植物叶片的扫描电子显微图。介绍和一些常见的莎草

New Journal of Botany Pub Date : 2013-12-01 DOI: 10.1179/2042349713Y.0000000029

M. Proctor, M. Bradshaw

{"title":"Scanning electron micrographs of leaves of British Carex species, 1. Introduction and some common sedges","authors":"M. Proctor, M. Bradshaw","doi":"10.1179/2042349713Y.0000000029","DOIUrl":"https://doi.org/10.1179/2042349713Y.0000000029","url":null,"abstract":"Abstract Scanning electron micrographs are presented of ten species of Carex, illustrating the range of leaf characters displayed by this technique. Leaf-surface characters include the distribution and form of the stomata on the two surfaces, whether they are flush with the leaf-surface or sunk in pits or hidden amongst papillae, and the size, texture and ornamentation of the epidermal cells on the two surfaces of the leaf. Most Carices have their stomata mainly on the underside of the leaf (hypostomous); C. nigra and C. rostrata have most of their stomata on the upperside (epistomous); and C. canescens has stomata on both leaf surfaces (amphistomous). Stomatal distribution can be seen with a hand lens and is a useful field character. The stomata in many species are flush with the smooth leaf surface but, in C. flacca and C. panacea, they are hidden among the closely-set papillae covering the lower leaf surface. In C. rostrata, they are surrounded by papillae on the upper surface in contrast to C. vesicaria, where they lie flush with the smooth lower surface. The presence of forward-pointing teeth on the upperside of the leaves of C. pilulifera is a striking feature in scanning micrographs, in contrast with the smoother surface of C. caryophyllea. Of the needle-leaved species, C. dioica has one broad band of stomata on each side of the leaf, but C. pulicaris has two narrower rows; this character can be seen with a good hand-lens in the field.","PeriodicalId":19229,"journal":{"name":"New Journal of Botany","volume":"77 1","pages":"197 - 204"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85913047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Botanical records and their role in shaping nature conservation priorities and actions – an English perspective 植物记录及其在形成自然保护优先事项和行动中的作用-英语视角

New Journal of Botany Pub Date : 2013-12-01 DOI: 10.1179/2042349713Y.0000000027

K. Porter, S. Leach

{"title":"Botanical records and their role in shaping nature conservation priorities and actions – an English perspective","authors":"K. Porter, S. Leach","doi":"10.1179/2042349713Y.0000000027","DOIUrl":"https://doi.org/10.1179/2042349713Y.0000000027","url":null,"abstract":"Abstract The species distribution maps in the Atlas of the British Flora (1962) had a profound impact on the development of nature conservation policies and priorities in Britain. Many lists of ‘important species’ used by conservationists today have their origins in these maps. Selection criteria for Sites of Special Scientific Interest (SSSI) make considerable use of such lists, with 573 SSSIs in England notified for one or more named vascular plant species or for assemblages of nationally rare and scarce plants. A review of the SSSI series in England is underway, while SSSI selection guidelines for vascular plants are in the process of being revised. The SSSI review aims to identify where amendments to existing SSSIs are needed and to propose new sites, where necessary, to fill gaps in the current series. Botanical records are critically important to this review, as they are to the monitoring of vascular plants on SSSIs and other protected sites, and to targeting and assessing the effectiveness of agri-environment schemes. The current Natural England/BSBI Memorandum of Agreement is designed to encourage closer working between the two organisations, founded on a mutual understanding of the key role that botanical records, and recorders, continue to play in shaping nature conservation priorities and actions ‘on the ground’.","PeriodicalId":19229,"journal":{"name":"New Journal of Botany","volume":"78 1","pages":"148 - 155"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88407460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Validation of Carex×marshallii ( = C. lepidocarpa×C. saxatilis, Cyperaceae) 验证Carex×marshallii (= C。lepidocarpa×C。saxatilis,莎草科)

New Journal of Botany Pub Date : 2013-08-01 DOI: 10.1179/2042349713Y.0000000026

N. Blackstock, C. Smith

引用次数: 0