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1.
Aim Our aims were: (1) to characterize the linear relationship between the proportion of woody dicotyledonous species with entire-margined leaves ( E ) and mean annual temperature (MAT) from a southern temperate flora that still harbours many lineages that originated under warmer climates; (2) to compare this relationship with those developed from floras of different regions of the world; and (3) to contrast temperature predictions based on leaf margins of the native southern flora versus the naturalized alien flora, mostly of boreal origin.
Location The temperate forest of southern South America (TFSA).
Methods At each 1° latitudinal band, we estimated E based on species latitudinal ranges and MAT from both an isotherm map and a global temperature grid. We also calculated E from five local floras located between 40 and 43° S, and from the naturalized alien flora of Nahuel Huapi National Park in southern Argentina.
Results We found a close relationship between E and MAT for the TFSA. Equations developed from floras of the Northern Hemisphere overestimated extant temperatures of this biome by 6–10 °C at both geographical and local spatial scales. On the other hand, MAT predictions from leaf margins of the alien flora were similar to the actual MAT. A published regression between E and MAT from tropical South America was remarkably similar to the one we estimated from the TFSA. This tropical equation predicted accurately the temperatures observed for this temperate biome based on leaf margins of the native flora.
Main conclusions Despite massive plant extinction due to environmental cooling and biogeographical isolation during the Tertiary, leaf-margin analysis reveals that the flora of the TFSA still reflects its original development under the warmer conditions of western Gondwana and its past connections with low-latitude forest floras of tropical South America. 相似文献
Location The temperate forest of southern South America (TFSA).
Methods At each 1° latitudinal band, we estimated E based on species latitudinal ranges and MAT from both an isotherm map and a global temperature grid. We also calculated E from five local floras located between 40 and 43° S, and from the naturalized alien flora of Nahuel Huapi National Park in southern Argentina.
Results We found a close relationship between E and MAT for the TFSA. Equations developed from floras of the Northern Hemisphere overestimated extant temperatures of this biome by 6–10 °C at both geographical and local spatial scales. On the other hand, MAT predictions from leaf margins of the alien flora were similar to the actual MAT. A published regression between E and MAT from tropical South America was remarkably similar to the one we estimated from the TFSA. This tropical equation predicted accurately the temperatures observed for this temperate biome based on leaf margins of the native flora.
Main conclusions Despite massive plant extinction due to environmental cooling and biogeographical isolation during the Tertiary, leaf-margin analysis reveals that the flora of the TFSA still reflects its original development under the warmer conditions of western Gondwana and its past connections with low-latitude forest floras of tropical South America. 相似文献
2.
Thomas J. Stohlgren Petr Py?ek John Kartesz Misako Nishino An��bal Pauchard Marten Winter Joan Pino David M. Richardson John R. U. Wilson Brad R. Murray Megan L. Phillips Li Ming-yang Laura Celesti-Grapow Xavier Font 《Biological invasions》2011,13(9):1931-1944
Estimates of the level of invasion for a region are traditionally based on relative numbers of native and alien species. However, alien species differ dramatically in the size of their invasive ranges. Here we present the first study to quantify the level of invasion for several regions of the world in terms of the most widely distributed plant species (natives vs. aliens). Aliens accounted for 51.3% of the 120 most widely distributed plant species in North America, 43.3% in New South Wales (Australia), 34.2% in Chile, 29.7% in Argentina, and 22.5% in the Republic of South Africa. However, Europe had only 1% of alien species among the most widespread species of the flora. Across regions, alien species relative to native species were either as well-distributed (10 comparisons) or more widely distributed (5 comparisons). These striking patterns highlight the profound contribution that widespread invasive alien plants make to floristic dominance patterns across different regions. Many of the most widespread species are alien plants, and, in particular, Europe and Asia appear as major contributors to the homogenization of the floras in the Americas. We recommend that spatial extent of invasion should be explicitly incorporated in assessments of invasibility, globalization, and risk assessments. 相似文献
3.
Patterns of plant invasions in China: Taxonomic,biogeographic, climatic approaches and anthropogenic effects 总被引:1,自引:0,他引:1
Shan-Huah Wu Hao-Ting Sun Yung-Ching Teng Marcel Rejmánek Shu-Miaw Chaw T.-Y. Aleck Yang Chang-Fu Hsieh 《Biological invasions》2010,12(7):2179-2206
This study was aimed to determine the patterns as well as the effects of biological, anthropogenic, and climatic factors on
plant invasions in China. About 270 volumes of national and regional floras were employed to compile a naturalized flora of
China. Habit, life form, origin, distribution, and uses of naturalized plants were also analyzed to determine patterns on
invasion. Correlations between biological, anthropogenic and climatic parameters were estimated at province and regional scales.
Naturalized species represent 1% of the flora of China. Asteraceae, Fabaceae, and Poaceae are the dominant families, but Euphorbiaceae
and Cactaceae have the largest ratios of naturalized species to their global numbers. Oenothera, Euphorbia, and Crotalaria were the dominant genera. Around 50% of exotic species were introduced intentionally for medicinal purposes. Most of the
naturalized species originated in tropical America, followed by Asia and Europe. Number of naturalized species was significantly
correlated to the number of native species/log area. The intensity of plant invasion showed a pattern along climate zones
from mesic to xeric, declining with decreasing temperature and precipitation across the nation. Anthropogenic factor, such
as distance of transportation, was significantly correlated to plant invasions at a regional scale. Although anthropogenic
factors were largely responsible for creating opportunities for exotic species to spread and establish, the local biodiversity
and climate factors were the major factors shaping the pattern of plant invasions in China. The warm regions, which are the
hot spots of local biodiversity, and relatively developed areas of China, furthermore, require immediate attentions. 相似文献
4.
Determinants of regional and local patterns in the floras of braided riverbeds in New Zealand 总被引:3,自引:0,他引:3
Aim To determine the composition and biogeographical origins of the native and naturalized flora of braided shingle riverbeds in New Zealand and whether the proportion of naturalized species is greater than in similar habitats elsewhere in the world. To test whether regional species pools, landscape matrix configuration, and local riverbed environment are all equally important in determining community structure in these systems. Location The braided reaches of four catchments on each of the eastern and western sides of North Island and South Island, New Zealand. Methods Plotless records of all native and naturalized seed plant and fern species on disturbed mobile surfaces were made over the length of four rivers. Altitude, climate variables, riverbed attributes, and surrounding land‐cover from maps were recorded for each site. For all species, the taxonomy, life form, origin and history, and presence within the province through which the rivers flowed, was obtained from published floras. Direct and indirect ordination and variance partitioning were employed to examine how native and naturalized species composition varies among and within rivers, and the degree to which this variation reflects climate, characteristic of riverbeds, and the surrounding land‐cover. Regression was used to determine how much introduction date and native geographical range influence the frequency of naturalized species. Results The total riverbed flora of 289 species comprises 40% native species and 60% naturalized species, both dominated by Asteraceae and Poaceae. The relative contributions of other plant families differ, and the two groups comprise different life‐form spectra. Native species occur across fewer rivers (mean 1.6 rivers) than naturalized species (mean 2.1 rivers). Species common in at least one river system tend to be widespread, occurring in at least three rivers. The rivers differ in their floras, with distinctions between North Island and South Island, and eastern and western rivers. The South Island rivers have more native species and a higher proportion of their regional native species pools than North Island rivers, whereas they have a lower proportion of their naturalized species pools. Introduction date and native geographical range are correlated with frequency of individual naturalized species. Geographical position and climate, riverbed variables of substrate size and seepage presence, and the type of adjacent land‐cover, differ between rivers and are significantly related to species composition. Land‐cover variables alone account for 46% of the explained variation in species composition, environmental variables alone 32% and components of the environment and land‐cover that co‐vary, 22%. Main conclusions New Zealand shingle riverbeds are among the riparian communities in the world most invaded by naturalized species but comparisons are difficult because studies of similar riverbeds are rare. New Zealand riverbeds are dominated by short‐lived terrestrial species from Eurasia. Native species are most frequent in South Island rivers draining extensive high mountains, and their abundances are determined to a greater extent by riverbed processes than are those of the naturalized species, which are more abundant when the surrounding landscape is modified. The distribution of the naturalized flora is not yet at equilibrium with the environment. Each river has a distinctive flora determined by ambient environmental factors, aspects of the riverbed environment itself, adjacent land‐cover reflecting the presence of native vegetation, the intensity of human modification or use, and invasion history. 相似文献
5.
Do climatically similar regions contain similar alien floras? A comparison between the mediterranean areas of central Chile and California 总被引:1,自引:0,他引:1
Alejandra Jiménez Aníbal Pauchard Lohengrin A. Cavieres Alicia Marticorena Ramiro O. Bustamante 《Journal of Biogeography》2008,35(4):614-624
Aim Taxonomic comparisons of alien floras across climatically similar regions have been proposed as a powerful approach for increasing our understanding of plant invasions across scales. However, detailed comparisons between the alien biotas of climatically similar regions are scarce. This study aims to compare the taxonomic patterns of alien species richness in mediterranean‐type climate areas of central Chile and California, in order to better understand how climatically similar regions converge or diverge in terms of their alien flora. Location Central Chile and California, United States. Methods We compared the alien floras of the state of California in the United States and central Chile, considering within‐region variation and taxonomic composition up to the species level. To test for within‐region variation, administrative units and counties were grouped within seven latitudinal bands for each region. We tested for differences in the relative contributions of the various origins of the naturalized species to each region. We used a family naturalization index to establish which families had relatively higher numbers of naturalized species in each region. We evaluated the similarity, using cluster analyses with Jaccard’s similarity index, of alien taxa between regions and latitudinal bands using presence–absence matrices at the species, genus and family levels. We used principal components analysis to determine the presence of a compositional gradient including all latitudinal bands. Results We recorded 1212 alien plant species in California and 593 in central Chile, of which 491 are shared between the two regions. These figures include 25 species that are native to California and 37 that are native to Chile. A comparison between the alien floras of central Chile and California reveals three major trends: (1) higher naturalized species diversity for California than for Chile, at all taxonomic levels; (2) differences in the proportion of species according to origin, with America, Africa, Asia and Australia providing a larger number of species in California than in Chile; (3) segregation between regions in terms of taxonomic composition of their alien flora, and a rather weak differentiation within regions; and (4) a trend towards higher similarity between the alien floras of latitudinal bands associated with higher levels of human disturbances. Main conclusions The alien floras of central Chile and California are significantly different, but this difference diminishes in highly disturbed areas. Thus, the current high levels of species movement caused by globalization, together with increasing levels of anthropogenic disturbances, should reduce the differentiation of the alien floras in these regions, increasing overall biotic homogenization. 相似文献
6.
Continental tropical ecosystems are generally viewed as less vulnerable to biological invasions than island ones. Their apparent
resistance to invasive alien species is often attributed to their higher native biota diversity and complexity. However, with
the increase of human activities and disturbances and the accelerate rate of introductions of plant species, these apparently
resilient continental ecosystems are now experiencing alien plant naturalization and invasion events. In order to illustrate
this emergent phenomenon, we compiled a list of all known introduced and naturalized plant species in French Guiana (Guiana
Shield, South America). A total of 490 alien plants were recorded, about 34% of which are currently naturalized, mainly species
belonging to the Acanthaceae and Fabaceae (Faboideae) in the Eudicotyledons, and Poaceae (grasses) and Arecaceae (palms) in
the Monocotyledons. The coastal dry and wet savannas appears to be vulnerable to plant invasion (with 165 naturalized species,
about 34% of the alien flora), especially by Acacia mangium (Mimosaceae) and Melaleuca quinquenervia (Myrtaceae) which are forming localized but dense monotypic stands. Both tree species, intentionnally introduced for reforestation,
rehabilitation, and as garden ornamentals and have the potential to spread with increasing human disturbances The number and
abundance of naturalized alien plants in the relatively undisturbed tropical lowland rainforests and savannas remains still
very low. Therefore, surveillance, early detection, and eradication of potential plant invaders are crucial; moreover collaboration
with neighbouring countries of the Guiana Shield is essential to prevent the introduction of potentially invasive species
which are still not present in French Guiana. 相似文献
7.
Anzar A. Khuroo Ewald Weber Akhtar H. Malik G. H. Dar Zafar A. Reshi 《Nordic Journal of Botany》2010,28(6):685-696
Biodiversity inventories unravel insightful taxonomic and biogeographic patterns that provide valuable inputs in guiding conservation practices and policymaking. Here we present an updated inventory of the native and alien woody flora of the Kashmir Himalaya, India, together with analyses of the patterns of taxonomic composition, geographic distribution, and invasion status of the alien species. The data was assembled from the floristic literature of the last two centuries, supplemented with herbarium records and validated by field surveys over the past decade. In total, the woody flora comprised of 520 species; out of these 322 species were native and 198 alien, yielding a proportion of 38% aliens. Amongst the natives, 16 species are on the IUCN red list 2009. While 37 genera included both native and alien species indicating a potential for hybrid formation, only 15 families were represented by alien species exclusively. Regarding the invasion status, presently 37 alien woody species are naturalized and 7 are invasive in the region. The results show that the Kashmir Himalaya harbours a diverse woody flora. It is concluded that a distinction between the native and the alien flora, as adopted in the present study, is crucial for a meaningful analysis of any biodiversity patterns. We predict that in the near future many alien woody species, presently naturalized in the region, can become serious plant invaders, and therefore need further research efforts and timely management. 相似文献
8.
作者在整理北美外来入侵植物中发现一些起源(或主要分布)于东亚植物的学名,在北美乃至欧洲使用非常混乱.本文特将有关重要类群整理出来,包括异名、原产地、北美的分布以及必要的讨论等. 相似文献
9.
Goran T. Anačkov Milica M. Rat Boris Dj. Radak Ružica S. Igić Dragana M. Vukov Marko M. Rućando Mirjana M. Krstivojević Snežana B. Radulović Dušanka Lj. Cvijanović Dubravka M. Milić Biljana I. Panjković Klara L. Szabados Ranko D. Perić Alen M. Kiš Vida R. Stojšić Pal P. Boža 《Central European Journal of Biology》2013,8(10):1032-1043
Floristic diversity in the Pannonian Plain is the result of mosaic habitat composition, characterized by steppes, saline meadows, and lowland forests along major rivers. In the last few centuries, the flora has become enriched by species introduced by human activities, such as colonization and industrialization. Presently it consists of nearly 1800 species. As a result of 30 years of field research as well as herbarium and literature searches, a list of invasive alien neophytes has been compiled and is presented here. The list includes 152 species, classified as either naturalized, casual, or unknown. One of the species is listed in Red Book of Serbian Flora. Eighty species are naturalized, and 61 are casual species. The majority of the introduced flora originates from North America (66) and the Old World (43). Most alien invasive species of the Southeastern part of the Pannonian Plain, were introduced accidentally by seed material or deliberately by nursery saplings. The annual and perennial herbaceous plants, which flower in the summer and summer-autumn periods, are represented in the greatest numbers. The alien flora was further analyzed with respect to taxonomy, life forms, pollination, and seed dispersal mode. The greatest number of alien species appears in anthropogenic and semi-natural habitats (59). In natural habitats, 45 invasive taxa were recorded, representing a conservation threat to biodiversity. 相似文献
10.
The impact of naturalized legumes on plant communities in Northern Taiwan: are we worrying too much?
Jenn-Kuo Tsai Hao-Ting Sun Chiao-Fen Chen Chang-Fu Hsieh Shan-Huah Wu 《Plant Ecology》2010,211(1):171-180
Habitat transformation caused by naturalized legumes has been considered as a profound environmental threat worldwide. However,
the weight of the impact on species diversity of local native and naturalized flora has yet to be revealed. In order to gain
a better understanding of the phenomenon, we developed and tested the following hypotheses: (1) naturalized legumes promote
local species diversity; (2) naturalized legumes increase local naturalized species diversity rather than native biodiversity;
and (3) the impact of naturalized legumes varies with habitat type. Four counties in Northern Taiwan were selected to form
the study site. Nine major habitat types were identified in 100 sampling sites (1 km2/each site) in northern Taiwan, and a total of 2,242 plots (1 m2/each plot) were sampled. Species, cover, and biodiversity indices of both native and naturalized floras were obtained, and
soil samples were collected from plots with and without naturalized legumes analyzed. The biodiversity and cover of the whole
and naturalized flora were increased significantly by naturalized legumes, while no effects on native flora were found. The
significant increase in the species diversity and cover of the whole flora and naturalized flora disappeared when naturalized
legumes were excluded from the data set; the same trend was observed when habitat type was considered. Soil nitrogen was marginally
significantly higher in the plots with naturalized legumes. The effects of naturalized legumes on native and naturalized floristic
composition are divergent. Although species diversity and cover were increased by naturalized legumes, the additional species
were naturalized legumes per se, which were the only beneficiaries of the enriched soil. The naturalized legumes did not facilitate
further invasion by other exotic species, nor did they have an impact upon the native community in terms of cover, species
diversity, or composition. 相似文献
11.
为了解华南地区外来植物现状,通过野外调查和查阅文献等,确定华南地区有外来入侵和归化植物45科141属223种,以菊科(Asteraceae,38种)、豆科(Fabaceae,36种)、禾本科(Poaceae,19种)植物为主,其中草本植物和原产美洲的植物占优势,分别有204种(占总数的91.5%)和163种(占73.1%)。广东外来入侵植物有159种,归化植物23种;广西有入侵植物135种,归化植物16种;海南有入侵植物111种,归化种15种;香港有入侵植物105种,归化植物9种;澳门有入侵植物89种,归化种4种;华南5省区共有的外来入侵和归化植物为57种(55种为入侵植物,2种为归化植物)。广东是外来植物种类最多的地区,与其他4省区共有的外来入侵和归化植物种类也最多,说明广东同时是外来植物输入和输出大省。由于气候和生态生境的相似性,各省区都面临着其他植物从周边地区入侵的风险,因此在治理入侵植物时,应建立联合防控机制对外来入侵植物的联合监测和防控,以提升外来入侵植物的治理成效和降低其对人类健康和生态安全的威胁。 相似文献
12.
A list of 618 species of alien flowering plants recorded for Mexico is presented; they are distributed in 355 genera and 87 families. The families with the largest number of species are Poaceae (171), Fabaceae sensu lato (57), Asteraceae (56), and Brassicaceae (45). The representation of most families with alien species in Mexico agrees with the average distribution frequencies estimated by Pysek (1998 ) for 26 floras throughout the World. Exceptions are an under‐representation of Asteraceae and an over‐representation of Poaceae. Most alien species (78.9%) in Mexico have their origin in the Old World; South America ranks second with 9.6%. As defined by Richardson et al. (2000 ), 19.8% of the alien species could be considered casual aliens and 80.2% of them naturalized. The proportion of alien species relative to the 22,968 native flowering plant species recorded for Mexico is 2.7%. 相似文献
13.
Philip E. Hulme 《Global Ecology and Biogeography》2008,17(5):641-647
Aim The proportion of alien plant species in floras is increasingly being used to indicate the threat of invasions to native species and/or the homogenization of biodiversity. However, this indicator is only valuable if it is independent of the spatial extent and grain of observation. This study tested the equivalence of native and alien species–area relationships (SARs) in order to assess the support for scale invariance in the proportion of alien species in floras. Location England, UK. Methods Nested SARs were generated by assessing the richness of native and alien plant species drawn from the New atlas of the British and Irish flora for six areas comprising 100, 400, 900, 1600, 2500 and 3600 km2 with each larger area containing all smaller areas. Five replicate sets of nested areas encompassing northern, southern, eastern, western and central regions were chosen. For each set of nested areas, the log‐transformed species richness was regressed on log‐transformed area to fit a power function to the SAR. Results Native and alien plant SARs reveal consistent differences in slope, highlighting that the proportion of alien species is a function of spatial grain. Aliens are more rare than natives and have higher spatial turnover leading to faster accumulation of species as area increases. However, equivalent samples drawn from a larger spatial extent reveal similar alien and native SARs. Main conclusions The significant differential scale dependence in native and alien species richness observed in this study reflects dissimilar influences of regional drivers such as habitat, but potentially also propagule pressure and introduction history, that leads to the relative rarity and high spatial turnover of alien species. Maps of invasion hotspots that identify areas where the proportion of the alien flora is particularly high should therefore be treated with considerable caution since patterns across most grains used for species monitoring will be scale dependent. 相似文献
14.
Exotic species have begun to homogenize the global biota, yet few data are available to assess the extent of this process or factors that constrain its advance at global or continental scales. We evaluate homogenization of vascular plants across America north of Mexico by comparing similarity in the complete native and exotic floras between states and provinces of the USA and Canada. Compared with native species, exotic plants are distributed haphazardly among areas but spread more widely, producing differentiation of floras among neighbouring areas but homogenization at greater distance. The number of exotic species is more closely associated with the size of the human population than with ecological conditions, as in the case of native species, and their distributions are less influenced by climate than those of native species. 相似文献
15.
Aim Central America is a biogeographically interesting area because of its location between the rich and very different biota of North and South America. We aim to assess phytogeographical patterns in the bryophyte floras of oak forests and páramo of the Cordillera de Talamanca, Costa Rica. Location Tropical America, in particular the montane area of Cordillera de Talamanca, Costa Rica. Methods The analysis is based on a new critical inventory of the montane bryophyte flora of Cordillera de Talamanca. All species were assigned to phytogeographical elements on the basis of their currently known distribution. Absolute and percentage similarities were employed to evaluate floristic affinities. Results A total of 401 species [191 hepatics (liverworts), one hornwort, 209 mosses] are recorded; of these, 251 species (128 hepatics, one hornwort, 122 mosses) occur in oak forests. Ninety‐three per cent of all oak forest species are tropical in distribution, the remaining 7% are temperate (4%) and cosmopolitan (3%) species. The neotropical element includes almost 74% of the species, the wide tropical element (pantropical, amphi‐atlantic, amphi‐pacific) only 19%. A significant part of the neotropical species from oak forests are species with tropical Andean‐centred ranges (27%). As compared with bryophyte species, vascular plant genera in the study region are represented by fewer neotropical, more temperate and more amphi‐pacific taxa. Bryophyte floras of different microhabitats within the oak forest and epiphytic bryophyte floras on Quercus copeyensis in primary, early secondary and late secondary oak forest show a similar phytogeographical make‐up to the total oak forest bryophyte flora. Comparison of oak forest and páramo reveals a greater affinity of the páramo bryophyte flora to temperate regions and the great importance of the páramo element in páramo. Surprisingly, oak forests have more Central American endemics than páramo. Main conclusions (1) Providing first insights into the phytogeographical patterns of the bryophyte flora of oak forests and páramo, we are able to confirm general phytogeographical trends recorded from vascular plant genera of the study area although the latter were more rich in temperate taxa. (2) Andean‐centred species are a conspicuous element in the bryophyte flora of Cordillera de Talamanca, reflecting the close historical connection between the montane bryophyte floras of Costa Rica and South America. (3) High percentages of Central American endemics in the bryophyte flora of the oak forests suggest the importance of climatic changes associated with Pleistocene glaciations for allopatric speciation. 相似文献
16.
Aim Biotic homogenization is a growing phenomenon and has recently attracted much attention. Here, we analyse a large dataset of native and alien plants in North America to examine whether biotic homogenization is related to several ecological and biological attributes. Location North America (north of Mexico). Methods We assembled species lists of native and alien vascular plants for each of the 64 state‐ and province‐level geographical units in North America. Each alien species was characterized with respect to habitat (wetland versus upland), invasiveness (invasive versus non‐invasive), life cycle (annual/biennial versus perennial) and habit (herbaceous versus woody). We calculated a Jaccard similarity index separately for native, for alien, and for native and alien species. We used the average of Jaccard dissimilarity index (1 ? Jaccard index) of all paired localities as a measure of the mean beta diversity of alien species for each set of localities examined in an analysis. We used a homogenization index to quantify the effect of homogenization or differentiation. Results We found that (1) wetland, invasive, annual/biennial and herbaceous alien plants markedly homogenized the state‐level floras whereas non‐invasive and woody alien plants tended to differentiate the floras; (2) beta diversity was significantly lower for wetland, invasive, annual/biennial and herbaceous alien plants than their counterparts (i.e. upland, non‐invasive, perennial and woody alien plants, respectively); and (3) upland and perennial alien plants each played an equal role in homogenizing and differentiating the state‐level floras. Main conclusions Our study shows that biotic homogenization is clearly related to habitat type (e.g. wetland versus uplands), species invasiveness and life‐history traits such as life cycle (e.g. annual/biennial and herbaceous versus woody species) at the spatial scale examined. These observations help to understand the process of biotic homogenization resulting from alien vascular plants in North America. 相似文献
17.
18.
Aim To quantify the occurrence of floristic change in the vascular flora of Chile. We test whether continental areas have experienced floristic modification leading to either homogenization, differentiation or tracking.
Location Continental Chile.
Methods On the basis of the geographical distribution of native (1806 species) and naturalized plants (552 species) in continental Chile, we quantified change between two floristic stages: (1) pre-European flora, including native extant and extinct species; and (2) current flora, including native and naturalized species, but excluding extinct plants. We compared changes in compositional similarity (calculated by Jaccard's index, Δ J ) between pairs of regions, and similarity decay with respect to geographical distance. Additionally, by means of Whittaker's index, we examined species turnover, distinguishing between native and naturalized plants.
Results Between floristic stages (pre-European vs. current flora) no significant changes in floristic similarity were noted at national or regional scales. Similarity decay showed no statistical differences between pre-European and current flora. Analysing patterns of geographical turnover, we found that species turnover of naturalized plants over their geographical range is similar to that of native plants.
Conclusions The composition of the continental flora of Chile does not show significant modifications in similarity patterns after considering naturalized species, thus indicating floristic tracking. The causes of this phenomenon may be related to the current geographical distribution of naturalized plants, which closely parallels that of native plants. Our results differ from those obtained in Northern Hemisphere continents, thus indicating that trends of biotic change may differ between hemispheres. 相似文献
Location Continental Chile.
Methods On the basis of the geographical distribution of native (1806 species) and naturalized plants (552 species) in continental Chile, we quantified change between two floristic stages: (1) pre-European flora, including native extant and extinct species; and (2) current flora, including native and naturalized species, but excluding extinct plants. We compared changes in compositional similarity (calculated by Jaccard's index, Δ J ) between pairs of regions, and similarity decay with respect to geographical distance. Additionally, by means of Whittaker's index, we examined species turnover, distinguishing between native and naturalized plants.
Results Between floristic stages (pre-European vs. current flora) no significant changes in floristic similarity were noted at national or regional scales. Similarity decay showed no statistical differences between pre-European and current flora. Analysing patterns of geographical turnover, we found that species turnover of naturalized plants over their geographical range is similar to that of native plants.
Conclusions The composition of the continental flora of Chile does not show significant modifications in similarity patterns after considering naturalized species, thus indicating floristic tracking. The causes of this phenomenon may be related to the current geographical distribution of naturalized plants, which closely parallels that of native plants. Our results differ from those obtained in Northern Hemisphere continents, thus indicating that trends of biotic change may differ between hemispheres. 相似文献
19.
Residence time and human-mediated propagule pressure at work in the alien flora of Galapagos 总被引:1,自引:0,他引:1
Introduced species present the greatest threat to the unique terrestrial biodiversity of the Galapagos Islands. We assess
the current status of plant invasion in Galapagos, predict the likelihood of future naturalizations and invasions from the
existing introduced flora, and suggest measures to help limit future invasions. There has been a 1.46 fold increase in plant
biodiversity in Galapagos due to alien plant naturalizations, reflecting a similar trend on islands elsewhere. There are 870
alien plant species recorded in the archipelago. Of evaluated species, 34% species have naturalized. Within this group are
the invasive species (16% of evaluated) and the transformers (3.3% of evaluated). We show that, as expected, naturalized species
have been present in the archipelago longer than non-naturalized species. We also find that a higher human-mediated propagule
pressure is associated with a greater human population and with properties that have been settled longer. This, combined with
the relatively recent introduction of most species, leads us to the conclusion that Galapagos is at an early stage of plant
invasion. We predict that more species from the existing alien flora will find an opportunity to naturalize and invade as
propagule pressure increases alongside rapid human population growth associated with immigration to serve the booming tourism
industry. In order to reduce future invasion risk, we suggest reviewing inter-island quarantine measures and continuing community
education efforts to reduce human-mediated propagule pressure. 相似文献
20.
Anzar A. Khuroo Zafar A. Reshi Akhtar H. Malik Ewald Weber Irfan Rashid G. H. Dar 《Biological invasions》2012,14(1):99-113
The wide knowledge gaps in invasion biology research that exist in the developing world are crucial impediments to the scientific
management and global policymaking on biological invasions. In an effort to fill such knowledge gaps, we present here an inventory
of the alien flora of India, based on systematic reviews and rigorous analyses of research studies (ca. 190) published over
the last 120 years (1890–2010 AD), and updated with field records of the last two decades. Currently, the inventory comprises
of 1,599 species, belonging to 842 genera in 161 families, and constitutes 8.5% of the total Indian vascular flora. The three
most species-rich families are Asteraceae (134 spp.), Papilionaceae (114 spp.) and Poaceae (106 spp.), and the three largest
genera are Eucalyptus (25 spp.), Ipomoea (22 spp.), and Senna (21 spp.). The majority of these species (812) have no report of escaping from cultivation. Of the remaining subset of 787
species, which have either escaped from intentional cultivation, or spread after unintentional introduction, casuals are represented
by 57 spp., casual/naturalised by 114 spp., naturalised by 257 spp., naturalised/invasive by 134 spp., and invasive by 225
spp. Biogeographically, more than one-third (35%) of the alien flora in India has its native ranges in South America, followed
by Asia (21%), Africa (20%), Europe (11%), Australia (8%), North America (4%); and cryptogenic (1%). The inventory is expected
to serve as the scientific baseline on plant invasions in India, with implications for conservation of global biodiversity. 相似文献