Haseltonia最新文献_第9页

Flowering Phenology and Observations on the Pollination Biology of South American Cacti. 3. Temporally Robust Sequential “Big Bang” Flowering of Two Unrelated Sympatric Globular Cacti in Northern Argentina 2 .南美仙人掌开花物候及传粉生物学观察。阿根廷北部两种不相关的同域球形仙人掌的时序“大爆炸”开花

IF 1.5 4区生物学

Haseltonia Pub Date : 2017-12-01 DOI: 10.2985/026.023.0113

U. Eggli, Mario Giorgetta

{"title":"Flowering Phenology and Observations on the Pollination Biology of South American Cacti. 3. Temporally Robust Sequential “Big Bang” Flowering of Two Unrelated Sympatric Globular Cacti in Northern Argentina","authors":"U. Eggli, Mario Giorgetta","doi":"10.2985/026.023.0113","DOIUrl":"https://doi.org/10.2985/026.023.0113","url":null,"abstract":"Abstract: \u0000 Sequential flowering of sympatric plant species is a commonly observed phenomenon and is thought to contribute towards maintaining the pollinator community. Sequential flowering is also interpreted as a potential way to reduce competition for pollinators and to reduce interspecific pollen transport. Within-season sequential flowering is well-known for many species assemblages and usually shows a staggering over weeks and months. Here, we report on the flowering behaviour of two unrelated sympatric cacti (both Cactaceae — Cactoideae) from N Argentina, Acanthocalycium thionanthum (Cereeae — Trichocereinae) and Parodia microsperma (Notocacteae). At the start of the flowering season, the two taxa exhibit a temporally stable sequential mass-flowering that is triggered by the first rainfall event after the dry season: On the 6th or 7th day after the rainfall, Parodia microsperma starts a 3-day “big-bang” flowering period, and on the 8th or 9th day after the rainfall, Acanthocalycium thionanthum also starts a 3-day “big-bang” flowering period, with 1 day of overlap with that of Parodia. The sequence and duration, including the 1-day overlap, has been found to be temporally stable in all study years, with c. 90% of all flowers buds of a population opening synchronously in years with average spring rainfall. Later in the season, after the fruits derived from these initial flowerings have ripened, opportunistic flowering (including sporadic local small-scale mass flowerings) is exhibited by both species with no apparent synchronization or sequence. Only once was a second “big bang” flowering observed, likely caused by above-average dry conditions. The species pair is notable for the massive “big-bang” flowering triggered by rainfall with a tightly staggered synchronization, as well as for the change in flowering strategy later in the season.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"23 1","pages":"109 - 97"},"PeriodicalIF":1.5,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87301976","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: 6

Architectural Effects on Floral Traits in Sedum praealtum Dc. (Crassulaceae) in Mexico 建筑对荒漠景天花性状的影响。产于墨西哥的(天竺葵科)

IF 1.5 4区生物学

Haseltonia Pub Date : 2017-12-01 DOI: 10.2985/026.023.0105

A. Hernández-Ramírez

引用次数: 2

Extending the Natural Distribution Range of Astroloba herrei Uitewaal (Asphodelaceae: Alooideae): Implications for Its Conservation Status 扩大龙葵科:龙葵总科自然分布范围及其保护现状的启示

IF 1.5 4区生物学

Haseltonia Pub Date : 2017-12-01 DOI: 10.2985/026.023.0106

S. Molteno, Gideon F. Smith, E. Jaarsveld

{"title":"Extending the Natural Distribution Range of Astroloba herrei Uitewaal (Asphodelaceae: Alooideae): Implications for Its Conservation Status","authors":"S. Molteno, Gideon F. Smith, E. Jaarsveld","doi":"10.2985/026.023.0106","DOIUrl":"https://doi.org/10.2985/026.023.0106","url":null,"abstract":"Abstract: \u0000 Astroloba herrei Uitewaal (Asphodelaceae: Alooideae) is currently regarded as one of the rarest and most threatened species in the genus. The species is mostly recorded as having a small, restricted geographical distribution range, as well as a habitat that is vulnerable due, in part at least, to its proximity to human activity. Its distribution range is interpreted as disjunct, as the species is considered to be restricted to two widely separated areas: 1.) the immediate surrounds of Prince Albert in the Great Karoo, Western Cape Province, South Africa, and 2.) a contested spot north of Uniondale in the Little Karoo. We hypothesised that these two areas, separated by 100 km [60 miles], were contiguous, but not through the most frequented routes connecting these two spots. Map overlays for vegetation type, soil type, and geology were used to predict likely habitats in the more inaccessible region through which the areas could be connected, specifically along the northern (Great Karoo) slopes of the Swartberg. Based on the results, the most likely potential localities were identified and visited, and the species was found where predicted. Ground-truthing of the predicted range therefore confirmed that A. herrei is in fact far more widespread than previously believed. Its distribution stretches from west of Prince Albert, along the eastern Swartberg, and across the provincial border into the Eastern Cape Province, where it occurs along the R407 road that connects Prince Albert to Willowmore. At the eastern edge of its range it crosses the Swartberg to the south, and occurs north of Uniondale. Significantly, A. herrei has a natural range which in size by far outstrips that of a number of other Astroloba species. Based on the results of our work we propose that the conservation status of Astroloba herrei be changed from “Vulnerable D2” to “Least Concern”.","PeriodicalId":50413,"journal":{"name":"Haseltonia","volume":"23 1","pages":"39 - 47"},"PeriodicalIF":1.5,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85444721","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: 4

Organ Pipe Cactus, Stenocereus thurberi, with Fleshy Leaves on Spherical Short-Shoots that Have Indeterminate Growth 有肉质叶片的球形短枝，生长不确定

IF 1.5 4区生物学

Haseltonia Pub Date : 2017-12-01 DOI: 10.2985/026.023.0101

Root Gorelick

引用次数: 0

Typification of the Names Agave gustaviana J.N.Haage & E.Schmidt and A. Maximiliana Baker (Asparagaceae / Agavaceae) 龙舌兰(Agave gustaviana)名称的类型学J.N.Haage & E.Schmidt和A. Maximiliana Baker(天冬科/龙舌兰科)

IF 1.5 4区生物学

Haseltonia Pub Date : 2017-12-01 DOI: 10.2985/026.023.0112

Gideon F. Smith

引用次数: 2

Gasteria koenii, a New Gasteria Species from the Swartberg, Western-Cape, South Africa 标题南非西开普斯沃斯堡一新种