914 resultados para Endangered plants
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Shipping list no.: 92-0684-P.
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"1994"
Rare, Threatened and Endangered Species and Communities Tracked by the SC DNR Heritage Trust Program
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This species lists for South Carolina provides the scientific name, common name, USESA designation, state protection level, global rank, and state rank of rare, threatened, and endangered species and communities known to occur in the state.
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Cover title.
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Includes bibliographical references (v. 1, p. 106-116; v. 2, p. 106-114) and indexes.
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Includes bibliographical references (v.1, p. 101-115) and indexes.
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"R6-WAW-TP-027-91."
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"August 1997."
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本文采用以世界自然保护联盟(IUCN)濒危物种等级和标准为依据的中国物种红色名录确定出东北地区濒危植物。统计整理出濒危植物地理分布资料,通过对受威胁系数及遗传价值系数等系数的计算得到各个濒危种的优先保护值和保护等级,并以丰富度、优先保护值为指标运用不同方法得到的濒危植物保护的热点地区。主要结论如下: 东北地区共有濒危植物25科42属60种,其中中国特有种8种。濒危植物科属种三个层次植物区系是温带性质的。 应用多指标的优先保护值进行综合分析,将60种濒危植物划分了3个保护等级。一级保护的有长白松等11科14属18种;二级保护的有朝鲜梾木等12科16属19种;三级保护的有鱼鳞云杉等13科17属23种。 针对保护濒危植物丰富度高的县市和达到对所有种保护的目标,并综合考虑濒危植物受威胁程度、遗传价值、利用价值、保护现状和名录收录的因素,本文确定6个地区包含的19个县市作为本文濒危植物优先保护区域。优先保护区域如下:长白山的安图县、抚松县、长白朝鲜族自治县、临江市、和龙县和靖宇县,辽东山地的宽甸满族自治县、桓仁满族自治县、本溪满族自治县、清原满族自治县、新宾满族自治县、凤城市、庄河市和大连市,小兴安岭的伊春市,张广才岭的尚志市,老爷岭北部的鸡西市,大兴安岭的呼玛县和根河市。 本文首次以县市为单位对各县市自然保护区进行综合评价并划分综合评价级别。确定的优先保护区域中有4个县市对濒危植物的保护尚属空白,它们是临江市、和龙县、本溪满族自治县和鸡西市,建议采取措施对这些县市的濒危植物种加强保护。应通过对自然保护区晋级方式加强保护的有安图县的长白松保护区和根河市的西伯利亚五针松保护区。应加强辽东山地的除国家级自然保护区外的其它类型自然保护区中濒危植物的保护。
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Random amplified polymorphic DNA ( RAPD) markers were used to measure genetic diversity of Coelonema draboides ( Brassicaceae), a genus endemic to the Qilian Mountains of the Qinghai-Tibet Plateau. We sampled 90 individuals in 30 populations of Coelonema draboides from Datong and Huzhu counties of Qinghai Province in P. R. China. A total of 186 amplified bands were scored from the 14 RAPD primers, with a mean of 13.3 amplified bands per primer, and 87% ( 161 bands) polymorphic bands (PPB) was found. Analysis of molecular variance (AMOVA) shows that a large proportion of genetic variation (84.2%) resides among individuals within populations, while only 15.8% resides among populations. The species shows higher genetic diversity between individuals than other endemic and endangered plants. The RAPDs provide a useful tool for assessing genetic diversity of rare, endemic species and for resolving relationships among populations. The results show that the genetic diversity of this species is high, possibly allowing it to adapt more easily to environmental variations. The main factor responsible for the high level of differentiation within populations and the low level of diversity among populations is probably the outcrossing and long-lived nature of this species. Some long-distance dispersal, even among far separated populations, is also a crucial determinant for the pattern of genetic variation in the species. This distributive pattern of genetic variation of C. draboides populations provides important baseline data for conservation and collection strategies for the species. It is suggested that only populations in different habitats should be studied and protected, not all populations, so as to retain as much genetic diversity as possible.
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Es documenta la disminució de l’àrea de distribució i del nombre d’individus i s’avalua l’extensió actual d’Stachys maritima a la península Ibèrica, restringida a menys de 200 individus amb una àrea d’ocupació de només 8 km2. L’espècie és requalificada com a CR (en perill crític) en aquest territori, incrementant l’anterior valoració com a VU (vulnerable). Se suggereixen les mesures de conservació adequades que permetin garantir simultàniament activitats de turisme sostenibles
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Tillandsia gardneri is a bromeliad with ornamental value and a wide geographical distribution over Brazil. However, due to habitat loss and illegal overcollection in the wild it is included as a vulnerable species in the official list of endangered plants of the State of Rio Grande do Sul, Brazil. The development of a protocol for T. gardneri seed propagation in vitro may be useful for reintroducing plants in their natural habitats, and for germplasm conservation. A difficult problem encountered during the establishment of an in vitro culture is explants disinfection, especially when working with endangered species, from which explant availability is restricted. Thus, the establishment of a sterilization protocol is crucial for the initiation and success of a micropropagation system for T. gardneri. The objective of this study was to evaluate the effect of sodium hypochlorite concentration and exposure time in seed and seedling surface disinfection, tissue sensitivity and development. Sodium hypochlorite solutions (10 or 20%/5, 10 or 15 min; 25%/5 or 10 min; and 50%/5 min) were effective in eliminating seed superficial contaminants. There was no significant difference among the effective sterilization treatments in relation to seed germination (%), and seedling length and number of leaves, after 120 days in vitro. Also, no damage to seed and seedling tissues were observed. Surface sterilization of seedlings, for initiation of an in vitro culture, required higher concentrations of sodium hypochlorite (25%/15 min; 20 or 50%/5, 10 or 15 min; and 40%/5 and 10 min) for controlling fungal and yeast contamination, compared to seed sterilization. No significant differences among these treatments were found in relation to seedling length and number of leaves, after 60 days in vitro.
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This study was accomplished in existing Cerrado's relicts at State Park Guartelá, Tibagi, PR (24°39'10S and 50°15'25W), which represent one of the last extreme-meridional remanescents of this type of formation. Fifty plots with dimensions of 5x5m were allocated for phyto-sociological analysis, including in the sample individuals with height ≥ 1 m, divided into two samples to evaluate the following strata: a) upper-plants with DAS ≥ 3 cm, and b) intermediate - plants with DAS <3cm. Moreover, in each plot, there were established sub-plots with dimensions of 1x1m for sampling the lower stratum, comprised by individuals with height <1m and >10cm. The complete survey found 1340 individuals distributed in 28 families, 66 genera and 115 species. The diversity index was higher for the mean component (H'=3.30), followed by the superior component (H'=3.09) and the inferior (H'=2.91). The frequent occurrence of bushes is a remarkable characteristic of the physiognomy of the areas inside the park and 82 % of the populations studied are distributed in aggregated standard. Because it is a marginal region of occurrence of cerrado vegetation, now under the influence of a subtropical climate, more humid and cold, compared to the core area of this biome, it is noted that these areas are characterized by a decrease in stature, richness and diversity of its flora. Nevertheless, they preserve typical species of the Brazilian Savannah; but, due to their distribution in relicts and been, in part, devastated, some are included in the red list of endangered plants in Parana state, which evidences the importance of conservation and management of these areas.
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Ctenosaura similis is exotic to Florida (Meshaka et al. 2004. The Exotic Amphibians and Reptiles of Florida, Krieger Publ. Co., Malabar, Florida. 155 pp.), whereas Gopherus polyphemus is listed as a species of special concern by the state of Florida (Florida Wildlife Code Chap. 39 F.A.C.), and as a threatened species by the Florida Committee on Rare and Endangered Plants and Animals (FCREPA) (Moler 1992. Rare and Endangered Biota of Florida: Volume III, Reptiles and Amphibians. University Press of Florida, Gainesville, Florida. 291 pp.).
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"Submitted as part of U.S. Army Corps of Engineer [sic] Contract #DACW37-76-C-0057."