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Germination of macrophytes from a Delaware River tidal freshwater wetland 特拉华河潮汐淡水湿地中大型植物的发芽
Pub Date : 1996-01-01 DOI: 10.2307/2996306
M. A. Leck
LECK, M. A. (Biology Department, Rider University, Lawrenceville, NJ 08648). Germination of macrophytes from a Delaware River tidal freshwater wetland. Bull. Torrey Bot. Club 123: 48-67. 1996. The effects of burial and soil moisture (seeds were on the surface, or buried at 1 and 5 cm with drained, saturated, or flooded water levels), inundation (Petri dishes, and open and closed jars), and storage (-0 and -100% RH), as well as of light and various temperature regimes, were examined. Focus was on ten species (Amaranthus cannabinus (L.) Sauer, Ambrosia trifida L., Bidens laevis (L.) BSP, Impatiens capensis Meerb., Peltandra virginica (L.) Schott. & Endl., Phalaris arundinacea L., Pilea pumila (L.) A. Gray, Polvgonum arifblium L., Polygonum punctatum Elliott, and Sagittaria latifolia Willd.); five others were also considered to a limited extent (Alisma subcordatum Raf., Carex lurida Wahlenb., Cicuta maculata L., Cuscuta gronovii Willd., and Pontederia cordata L.). Species varied in their germination responses. Those with the same seed bank strategy (transient or persistent) had different dormancy mechanisms although seeds with persistent seed banks required temperatures >50C and germination for most was enhanced by light. Responises to burial and moisture level showed that larger seeded species were able to germinate from greater depth, but germination was greater in drained samples. There were three types of responses to inundation: (1) requirement for at least modest amounts of oxygen, (2) requirement for hypoxic conditions, and (3) those having good germination regardless of inundation regime. Seed bank losses and relatively short seed bank longevity could be accounted for by germination following afterripening, adverse effects of prolonged inundation, failed gerrnination (e.g., germination at depths that preclude the seedling from reaching the surface), and predation. Differences between the seed characteristics of species of this and those of other wetlands relate to the transient nature of the seed bank and to wetland hydrology. Variable responses to drying have implications for wetland restoration projects.
(美国莱德大学生物系,美国新泽西州劳伦斯维尔08648)。特拉华河潮汐淡水湿地中大型植物的发芽。公牛。托里机器人。俱乐部123:48-67。1996. 研究了埋藏和土壤湿度(种子在地表,或在排水、饱和或淹没水位下埋在1和5厘米处)、淹没(培养皿、打开和关闭的罐子)、储存(-0和-100% RH)以及光照和各种温度制度的影响。重点研究了10种苋属植物(Amaranthus cannabinus, L.)Sauer, Ambrosia triida L., Bidens laevis (L.)凤仙花凤仙花凤仙花维吉尼亚穿山甲(L.)Schott。& Endl。,蝴蝶兰L.,蝴蝶兰(L.)A. Gray, Polvgonum arifblum L., Polygonum punctatum Elliott,和Sagittaria latifolia wild .);其他五个也在有限程度上被考虑(Alisma subcordatum Raf)。, Carex lurida Wahlenb。,黄斑柳,黄斑柳。(Pontederia cordata L.)。不同物种的发芽反应不同。具有相同种子库策略(瞬时或持久)的种子具有不同的休眠机制,但具有持久种子库的种子需要50 ~ 50℃的温度,并且大多数种子在光照下萌发。对埋藏和水分水平的响应表明,较大的种子物种能够从更深的深度发芽,但在排水的样品中萌发率更高。对淹没的反应有三种类型:(1)至少需要适量的氧气,(2)需要缺氧条件,(3)无论淹没情况如何,萌发都很好。种子库的损失和相对较短的种子库寿命可以由以下因素来解释:成熟后的发芽、长时间淹没的不利影响、发芽失败(例如,种子在深处发芽,使幼苗无法到达地表)和捕食。该湿地物种种子特征与其他湿地物种种子特征的差异与种子库的短暂性和湿地水文有关。对干旱的不同响应对湿地恢复工程具有重要意义。
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引用次数: 80
Cleistogamy and seed heteromorphism in Triplasis purpurea (Poaceae) 紫花三叶草的隐雌交配和种子异型性研究
Pub Date : 1996-01-01 DOI: 10.2307/2996303
G. P. Cheplick
CHEPLICK, G. P (Department of Biology, The College of Staten Island of the City University of New York, Staten Island, NY 10314). Cleistogamy and seed heteromorphism in Triplasis purpurea (Poaceae). Bull. Torrey Bot. Club 123: 25-33. 1996.-Two populations of the annual grass Triplasis purpurea on Staten Island, New York, were examined to determine the importance of cleistogamy (CL) to caryopsis (seed) production, and whether CL was associated with a position-dependent seed heteromorphism, as noted in other CL grasses. The percentage of tillers with terminal panicles bearing chasmogamous spikelets was low in both populations (s35%), and at least 72% of the seeds produced by tillers with terminal panicles were matured on axillary panicles in CL spikelets enclosed by leaf sheaths. A marked seed heteromorphism exists in T. purpurea: from the lower to the upper nodes along a tiller, there was an increase in seed number with a concurrent decrease in mean seed mass. This heteromorphism was further investigated in a greenhouse experiment where plants were subjected to low, medium, and high levels of soil nutrients by periodic addition of N-P-K fertilizer. Again, there was a progressive increase in seed number with a concordant decrease in mean seed mass from the lower to the upper tiller nodes. Differences in seed number among nutrient treatment groups were greatest in the upper nodes, but differed very little in the lower nodes. This is the first report of seed heteromorphism in this species. It is suggested that the position-dependent variation in seed mass reflects differences in the timing and length of the maturation period. From an evolutionary perspective, this pattern of seed heteromorphism may represent an adaptation to an unpredictable, highly-disturbed environment.
CHEPLICK, g.p(纽约城市大学史泰登岛学院生物系,纽约史泰登岛10314)。紫花三棱的隐雌交配和种子异型性。公牛。托里机器人。俱乐部123:25-33。1996.对纽约史坦顿岛的两个一年生草Triplasis purpurea群体进行了研究,以确定闭锁配花(CL)对颖果(种子)生产的重要性,以及CL是否与其他闭锁配花草中发现的位置依赖性种子异型性有关。在这两个群体中,顶穗分蘖中产生裂花小穗的比例都很低(约35%),至少72%的顶穗分蘖的种子是在被叶鞘包围的CL小穗的腋生穗上成熟的。紫荆种子存在明显的异型性,沿分蘖从下节到上节,种子数量增加,平均种子质量减少。在温室试验中,通过定期添加N-P-K肥料,植物受到低、中、高水平土壤养分的影响,进一步研究了这种异型性。同样,种子数量的增加和平均种子质量的减少是一致的,从下到上分蘖节。各营养处理间种子数差异以上节最大,下节差异很小。这是该物种种子异型性的首次报道。结果表明,种子质量的位置依赖性变化反映了成熟期的时间和长度的差异。从进化的角度来看,这种种子异型模式可能代表了对不可预测的、高度干扰的环境的适应。
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引用次数: 21
Effect of gap size and regeneration niche on species coexistence in bryophyte communities 林隙大小和更新生态位对苔藓植物群落物种共存的影响
Pub Date : 1996-01-01 DOI: 10.2307/2996302
R. W. Kimmerer, C. Young
Relative abundance of the two species varies with availability of the appropriate regeneration niche, which is a function of the local disturbance regime. Rodent activity may both produce the gaps favored by D. flagellare and facilitate its dispersal to them. Dominance of T. pellucida is associated with larger gaps produced by decay. The interaction of the regeneration niche and the disturbance regime are found to be primary determinants of community structure on this unstable substrate.
两种植物的相对丰度随适当的再生生态位的可用性而变化,这是局部干扰制度的函数。啮齿动物的活动既可能产生鞭毛小鞭毛虫喜爱的缝隙,又可能促进其向这些缝隙扩散。透明T.的优势与腐烂产生的较大间隙有关。发现再生生态位和干扰制度的相互作用是这种不稳定基质上群落结构的主要决定因素。
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引用次数: 47
More on the Southward Spread of Common Milkweed, Asclepias syriaca L. 更多关于普通马利筋(Asclepias syriaca L.)向南传播的情况。
Pub Date : 1996-01-01 DOI: 10.2307/2996307
R. Wyatt
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引用次数: 14
More flowers or new cladodes? Environmental correlates and biological consequences of sexual reproduction in a Sonoran Desert prickly pear cactus, Opuntia engelmannii 更多的花还是新的枝?索诺兰沙漠仙人掌(Opuntia engelmannii)有性繁殖的环境因素和生物学后果
Pub Date : 1996-01-01 DOI: 10.2307/2996304
J. E. Bowers
BOWERS, JANICE E. (U.S. Geological Survey, 1675 W. Anklam Road, Tucson, AZ 85745). More flowers or new cladodes? Environmental correlates and biological consequences of sexual reproduction in a Sonoran Desert prickly pear cactus, Opuntia engelmannii. Bull. Torrey Bot. Club 123: 34-40. 1996.-Should a platyopuntia expend all aerolar meristems in flower production, no new cladodes could be produced, and further reproductive effort and vegetative growth would cease. To investigate the trade-off between flower and cladode production, the numbers of flowers, fruits, and cladodes were monitored for 4 years on 30 Opuntia engelmannii Saim-Dyck. plants on Tumamoc Hill, Tucson, Arizona. Plant size controlled the number of flowers initiated each spring. The proportion of flowers that developed (i.e., did not abort) was perhaps determined by December-February rainfall in the months before bloom, with more being developed in the wettest years. Models based on different ratios of initiated cladodes to initiated flowers demonstrated that continued high investment in flowers and fruits would eventually terminate reproduction altogether; therefore periods of high sexual reproduction should alternate with periods of high vegetative growth. In the first 3 years of this study, the ratio of new cladodes to initiated flowers was low, showing a high investment in sexual reproduction. As suggested by the model, the population recouped this investment in the fourth year, when the number of new cladodes was nearly 3 times the 1992-1994 mean, and the number of initiated flowers was only 73% of the 3-year mean.
(美国地质调查局,1675年)。安克兰路,图森,85745)。更多的花还是新的枝?索诺兰沙漠仙人掌(Opuntia engelmannii)有性繁殖的环境因素和生物学后果。公牛。托里机器人。俱乐部123:34-40。1996.-如果一个扁桃花在花的生产中消耗了所有的气枝分生组织,就不能产生新的枝,进一步的繁殖努力和营养生长就会停止。为了研究花与枝的平衡关系,对30株恩格尔曼尼(Opuntia engelmannii sam - dyck)的花、果和枝的数量进行了4年的监测。亚利桑那州图森市图马莫克山上的植物。植株大小控制着每年春天开花的数量。开花(即不流产)的比例可能是由开花前几个月的12月至2月的降雨量决定的,在最潮湿的年份开花的比例更多。基于不同初始枝与初始花比例的模型表明,持续对花和果实的高投入最终将完全终止生殖;因此,有性繁殖期应与营养生长期交替进行。在本研究的前3年,新枝与初始花的比例很低,表明有性繁殖的投入很高。模型表明,种群在第四年就收回了投资,新枝数几乎是1992-1994年平均值的3倍,而初始花数仅为3年平均值的73%。
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引用次数: 36
The European Garden Flora: A Manual for the Identification of Plants Cultivated in Europe Both Out-of-Doors and Under Glass. 1995. Volume 4: Dicotyledons (Part II): Dilleniaceae to Krameriaceae. 《欧洲园林植物区系:欧洲室外和玻璃下栽培植物鉴定手册》1995。第四卷:双子叶植物(第二部分):狄勒尼科到克莱莫里科。
Pub Date : 1996-01-01 DOI: 10.2307/2996310
R. Barneby, J. Cullen
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引用次数: 1
Nature's Champion: B. W. Wells, Tar Heel Ecologist. 大自然的捍卫者:柏油路生态学家b.w.威尔斯。
Pub Date : 1996-01-01 DOI: 10.2307/2996311
J. Snyder, J. R. Troyer
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引用次数: 0
An allozyme study of two sibling species of Lemna (Lemnaceae) with comments on their morphology, ecology and distribution Lemna属两个兄弟种的同工酶研究及其形态、生态和分布
Pub Date : 1996-01-01 DOI: 10.2307/2996300
D. Crawford, E. Landolt, D. Les
CRAWFORD, D. J. (Department of Plant Biology, The Ohio State University, Columbus, OH 43210), E. LANDOLT (Geobotanisches Institut ETH, Zurichbergstrasse 38, CH-8044, Zurich, Switzerland) AND D. H. LES (Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT 06269). An allozyme study of two sibling species of Lemna (Lemnaceae) with comments on their morphology, ecology and distribution. Bull. Torrey Bot. Club 123: 1-6. 1996.-Enzyme electrophoresis was employed to examine divergence between Lemna mninuta H.B.&K. and L. valdiviana Phil., two nearly indistinguishable species comprising sect. Uninerves of Lemna. Fifteen presumptive loci were resolved for 25 clones of Lemna minuta and 26 of L. valdiviana. Genetic identity between the two species is 0.70, which is near the mean value for congeneric species of flowering plants, but is much higher than values reported for other species of Lemnaceae. With the exception of two clones, the taxonomic designations of the strains correlated with monomorphism for alternative alleles at two MDH loci. The two species are highly differentiated at two other loci as well. Although the taxa are morphologically similar, they differ in geographic distribution, flavonoid chemistry, and certain physiological and ecological attributes. The relatively high identity at allozyme loci compared to other Lemnaceae suggests that L. minuta and L. valdiviana are closely related and recently diverged sister species.
CRAWFORD, D. J.(俄亥俄州立大学植物生物系,Columbus, OH 43210), E. LANDOLT (ETH Geobotanisches研究所,Zurichbergstrasse 38, CH-8044, Zurich, Switzerland) AND D. H. LES (Connecticut大学生态与进化生物学系,Storrs, CT 06269)。Lemna属两个兄弟种的同工酶研究及其形态、生态和分布。公牛。托里机器人。俱乐部123:1-6。1996.-酶电泳法测定了两种植物间的差异。和L. valdiviana Phil。,两个几乎不可区分的种,包括钩藓的节。对25个lena minuta无性系和26个L. valdiviana无性系的15个推定位点进行了解析。两种植物的遗传同源性为0.70,接近开花植物同类种的平均值,但远高于lemaceae其他物种的报道值。除两个克隆外,菌株的分类名称与两个MDH位点的备选等位基因的单态相关。这两个物种在另外两个位点也高度分化。虽然它们在形态上相似,但在地理分布、类黄酮化学和某些生理生态属性上存在差异。同工酶位点的同源性较其他lemaceae植物高,表明L. minuta和L. valdiviana亲缘关系近,是新近分化的姊妹种。
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引用次数: 32
Life History Strategies of Florida Scrub Plants in Relation to Fire 佛罗里达灌丛植物与火灾的生活史策略
Pub Date : 1995-10-01 DOI: 10.2307/2996320
E. Menges, Nancy Kohfeldt
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引用次数: 196
The Quiescent Center in Aerial Roots of Orchids 兰花气生根的静止中心
Pub Date : 1995-10-01 DOI: 10.2307/2996318
V. Raghavan, C. Goh
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引用次数: 1
期刊
Bulletin of the Torrey Botanical Club
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