American Fern Journal最新文献

An Ecophysiological Study of Cystopteris fragilis with Evidence of Desiccation Tolerance 脆囊蝶类生态生理学研究：耐干燥的证据

IF 0.8 4区生物学

American Fern Journal Pub Date : 2024-06-17 DOI: 10.1640/0002-8444-114.2.140

O. R. Oger, A. N. Biology, Paleo Environment

{"title":"An Ecophysiological Study of Cystopteris fragilis with Evidence of Desiccation Tolerance","authors":"O. R. Oger, A. N. Biology, Paleo Environment","doi":"10.1640/0002-8444-114.2.140","DOIUrl":"https://doi.org/10.1640/0002-8444-114.2.140","url":null,"abstract":"Abstract. Cystopteris fragilis is widely distributed globally, particularly in the northern hemisphere and in temperate montane regions of the southern hemisphere. Nonetheless, there is limited published evidence of its physiological ecology. This is a report of the physiological ecology of C. fragilis growing in the crevices of a stone wall in Palisades, N. Y. during the summer of 2022 when the northeastern U. S. A. experienced an extended period of excessive heat and drought. Highest laboratory measurements of maximum rehydrated photosynthesis rate (Ac) occurred in June (1.83 µmol CO2 m–2 s–1) prior to the onset of the more severe heat and drought in July and August when the photosynthesis rates declined (1.47 and 1.58, respectively). The lowest rate was found in September (1.41) prior to onset of leaf senescence and dehiscence. Dark respiration (Rd) followed a comparable trend with the highest rate in June (0.82 µmol CO2 m–2 s–1), with lower rates in July, August, and September (0.40, 0.43, and 0.55, respectively). Additional evidence is presented on leaf fluorescence including chlorophyll concentration index (C.C.I.) as well as PS II data on quantum yield efficiency (Fv/Fm) and electron transfer per reaction center (ET0/RC) during each of the five months. This study provides the first evidence that C. fragilis can be a desiccation-tolerant, ‘resurrection fern’ capable of dormancy enduring extreme dehydration and resumption of normal physiological activity within 24 to 48 hours after heavy precipitation events.","PeriodicalId":50817,"journal":{"name":"American Fern Journal","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141335804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Isoetes salishensis, sp. nov. (Isoetaceae - Lycopodiopsida), An Endemic Quillwort of Coastal British Columbia, Canada Isoetes salishensis, sp.

IF 0.8 4区生物学

American Fern Journal Pub Date : 2024-06-17 DOI: 10.1640/0002-8444-114.2.111

Daniel F. Brunton, P. Sokoloff

引用次数: 0

Effects of Local Weather Conditions on the Population Dynamics of the Rock Fern Asplenium septentrionale in Estonia 当地天气条件对爱沙尼亚岩蕨类植物 Asplenium septentrionale 种群动态的影响

IF 0.8 4区生物学

American Fern Journal Pub Date : 2024-06-17 DOI: 10.1640/0002-8444-114.2.159

Maris Rattur, Ruth Aguraiuja, Tiiu Kull, Mari Sild

{"title":"Effects of Local Weather Conditions on the Population Dynamics of the Rock Fern Asplenium septentrionale in Estonia","authors":"Maris Rattur, Ruth Aguraiuja, Tiiu Kull, Mari Sild","doi":"10.1640/0002-8444-114.2.159","DOIUrl":"https://doi.org/10.1640/0002-8444-114.2.159","url":null,"abstract":"Abstract. The population dynamics of rock fern Asplenium septentrionale in Estonia was monitored from 1994 to 2020; the data were analysed to understand how the rhythm of local weather variables affects the population condition and renewal. Both fern clump size and life stage (sporeling, premature, mature, senescent) structure of the population were studied. Our results indicate that the population has been stable, with a high proportion of reproductive adults. Precipitation distribution through all seasons of the year had a major impact on population recruitment. June was the key period of the year determining the survival of young sporelings. Higher rainfall in the previous year supported higher numbers of premature clumps in the following year. The number of mature fern clumps was most influenced by weather conditions during winter months and precipitation at the end of summer. The long-term survival of mature clumps might be threatened if periods without rainfall extend into the growing season and occur during consecutive years. Monitoring methods of nationally protected fern species should be improved by including individual-based observations on life stage transitions of young sporophytes (sporeling to premature, premature to mature) for predicting future trends in population conditions.","PeriodicalId":50817,"journal":{"name":"American Fern Journal","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141335069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cover 封面

IF 0.8 4区生物学

American Fern Journal Pub Date : 2024-06-17 DOI: 10.1640/0002-8444-114.2.fmi

引用次数: 0

Two New Species of Adiantum from West-Central Brazil 来自巴西中西部的两个 Adiantum 新种

IF 0.8 4区生物学

American Fern Journal Pub Date : 2024-06-17 DOI: 10.1640/0002-8444-114.2.148

R. Y. Hirai, Jefferson Prado

引用次数: 0

Ferns and Lycophytes of Minnesota 明尼苏达州的蕨类植物和石龙子植物

IF 0.8 4区生物学