Population status and light regime at the occupied niche of the globally threatened liverwort Lejeunea mandonii (Steph.) Müll. Frib. on the Lizard Peninsula, UK

IF 1.2 3区 生物学 Q3 PLANT SCIENCES
D. Callaghan
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Abstract

ABSTRACT Introduction This study was carried out to investigate the population status and light regime at the occupied niche of the globally threatened liverwort Lejeunea mandonii on the Lizard Peninsula, West Cornwall, UK. Methods Surveys were undertaken at all locations from where the species has been known and counts made of individual-equivalents (occupied 1 m grid cells). Light loggers were used to measure the light regime across a full annual cycle at a control site and at colonies of the liverwort within deciduous woodland and heathland habitat, from which percentage shade was calculated. Key results and conclusions The species was refound at all eight locations at which it has been known previously. A total of 157 individual-equivalents were found and it is estimated that the real total is 189–300 individual-equivalents, with the largest populations at Bonython (64 individual-equivalents counted; 41%) and Poltesco (44 individual-equivalents counted; 28%). High illuminance (> 10,000 lux) was recorded commonly at the control site (29.5% of measurements; n = 52,560), rarely in heathland (2.6–6.6%) and never in deciduous woodland. Compared with heathland, shade in deciduous woodland is higher (annual mean = 78.4–91.1% vs 98.4–98.5%) and more consistent throughout the year. The status of the species across the Lizard Peninsula seems to be favourable, but the small size of the population and its localised occurrence mean that it will remain vulnerable.
全球濒危苔草Lejeunea mandonii(Stephen)Müll的种群状况和光照状况。Frib。在英国蜥蜴半岛
摘要/ ABSTRACT摘要:本研究对英国西康沃尔蜥蜴半岛(Lizard Peninsula)全球濒危植物Lejeunea mandonii的种群状况和生态位光照状况进行了调查。方法在所有已知物种的地点进行调查,并以个体当量(占用1 m网格)进行计数。利用光记录仪测量了一个对照点和落叶林地和石楠地的苔类群落在一个完整的年周期内的光照状况,并由此计算了遮荫百分比。主要结果和结论该物种在之前已知的所有八个地点都被重新发现。总共发现了157个个体等价物,据估计,实际总数为189-300个个体等价物,其中Bonython的种群最多(统计了64个个体等价物;41%)和Poltesco(计算了44个个人等同;28%)。高照度(bbb10万勒克斯)通常记录在对照点(29.5%的测量;N = 52,560),很少出现在石楠地(2.6-6.6%),从不出现在落叶林地。与石楠地相比,落叶林荫度更高(年平均值为78.4-91.1% vs 98.4-98.5%),且全年更稳定。整个蜥蜴半岛的物种状况似乎是有利的,但人口规模小,其局部发生意味着它仍然很脆弱。
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来源期刊
Journal of Bryology
Journal of Bryology 生物-植物科学
CiteScore
4.50
自引率
31.60%
发文量
20
审稿时长
3 months
期刊介绍: Journal of Bryology exists to promote the scientific study of bryophytes (mosses, peat-mosses, liverworts and hornworts) and to foster understanding of the wider aspects of bryology. Journal of Bryology is an international botanical periodical which publishes original research papers in cell biology, anatomy, development, genetics, physiology, chemistry, ecology, paleobotany, evolution, taxonomy, molecular systematics, applied biology, conservation, biomonitoring and biogeography of bryophytes, and also significant new check-lists and descriptive floras of poorly known regions and studies on the role of bryophytes in human affairs, and the lives of notable bryologists.
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