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Thursday, July 23, 2020 | History

2 edition of Characterizing hybridization between native and non-native Crataegus species. found in the catalog.

Characterizing hybridization between native and non-native Crataegus species.

Melissa Alison Purich

Characterizing hybridization between native and non-native Crataegus species.

by Melissa Alison Purich

  • 378 Want to read
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Published .
Written in English


About the Edition

Crataegus monogyna Jacq. is an old world species that has become naturalized in parts of North America. Crataegus punctata Jacq. is a native species whose range is restricted to eastern North America. Both taxa are diploid, obligately outcrossing species that are aggressive colonizers. In southern Ontario, they are the most common sympatric species pair within the genus and have overlapping floral phenologies. Hybrid individuals occur sporadically throughout sympatric populations and are morphologically intermediate with respect to the parental taxa. Experimental crosses were performed and characteristics of the pollination biology of each species were examined: pollen production and viability, pollen tube growth and pollen:ovule ratios. Polymorphic alleles were identified with DNA microsatellite markers. The results collectively demonstrate that there are weak ecological and mechanical barriers to gene flow between these species.

The Physical Object
Pagination114 leaves.
Number of Pages114
ID Numbers
Open LibraryOL19216233M
ISBN 100494071206

  The role of hybridization in species formation is a controversial topic. In plants, hybrid speciation via polyploidy (such as chromosome duplication) is quite common, and in a review this week. Hybridization between native and non-native species has serious biological consequences, but our understanding of how dispersal and selection interact to influence invasive hybridization is limited. Here, we document the spread of genetic introgression between a native (Oncorhynchus clarkii) and invasive (Oncorhynchus mykiss) trout, and identify the mechanisms influencing genetic admixture.

  () —Scientists have discovered that the rapid spread of hybridization between a native species and an invasive species of trout in the wild is strongly linked to changes in climate.   Introduction. Hybridization between two closely related species is a natural phenomenon observed in around 10% of animals and 25% of plant species [].Hybridization brings novelty in a gene pool, thus increasing fitness in new environments, and even speciation [].It requires gene flow and can occur when species are found in sympatry and when reproductive isolation is .

Non native species compete for food, space, and resources and some non native species will attack and kill the native species- it is never good for non native plants to get a foothold in a habitat. A related issue is the distinction between non‐native species introduced directly through human agency, and species colonizing through natural range expansion such as the fulmar Fulmarus glacialis. Because such species have colonized ‘naturally’, they could be considered as .


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Characterizing hybridization between native and non-native Crataegus species by Melissa Alison Purich Download PDF EPUB FB2

Purich MA. () Characterizing hybridization between native and non-native Crataegus species. Botany, University of Toronto, Toronto; R Core Team () R: A Language and Environment for Statistical Computing.

R Foundation for Statistical Computing, Vienna, Austria; Rohlf FJ, Archie by: 6. zation, however, has involved a species native to North America and a European species.

In western Oregon, the native hawthorn, Crataegus douglasii Lindl, var. suksdorfii Sarg., and an introduced European spe-cies, Crataegus monogyna Jacq., have come together within the last years.

The native species has black fruit, five styles, and mostly. Hybridization between native and non-native plant species in the riparian ecosystem 1. Does the project involve land acquisition, either in fee or through a conservation easement.

No 2. Will the applicant require access across public or private property that the applicant does not own to accomplish the activities in the proposal. Yes 3. There is abundant evidence of the contemporary potential for hybridization between Crataegus species within clade B (Phipps, ; Talent and Dickinson, ), as well as between Author: James Phipps.

Purich M. () Characterizing hybridization between native and non-native Crataegus species. Thesis, Botany Department, University of Toronto.

A BOOK on species hybridisation in animals is very badly needed, but would involve much labour in its compilation, as, although there is a good deal of information on the subject available, it is. In this study, 53 accessions from seven Crataegus taxa native to China and accessions of exotic Crataegus species (two from Europe and one from North America) were analyzed by specific locus.

Both apomixis and hybridization can complicate recognizing and characterizing species and intra-specific taxa in Crataegus, and thus obscure speciation events (Campbell &. There is evidence that traits of non-invasive species tend to be different from those of invasive spec26,27, and that differences in traits between native and invasive species are.

These results are more extreme than those from studies of hybridization between introduced C. monogyna and North American diploid Crataegus species (Love &. (c) Hybridization between species in nature. The lack of clarity of ecotypes and species is mirrored, above the species level, by hybridization and introgression, or ‘successful’ gene flow between species (Arnold ; Coyne & Orr ).

In truth, hybridization between species has always been well known, since Mayr's () excellent review. Yet in studying the displacement of native species by invading species the potential for interbreeding between an invading species and a native species is often ignored or understated.

It has been suggested that interbreeding increases the threat of extinction for a number of species due to hybridization introgression (Levin et al., Genetic homogenization, at a global scale, results from hybridization between native and introduced species or populations. Rhymer and Simberloff () reviewed cases of hybridization between native and alien species and populations, emphasizing examples and consequences in.

Hybridization involving non‐native species may create unique problems. This is especially true for invasives, that is, taxa that have attained a widespread distribution in the introduced range. Because introduced taxa have not coevolved with native congeners, prezygotic reproductive barriers may be weaker, on average, than among native congeners.

The phenotypic diversity of Crataegus pentagyna and C. monogyna was evaluated. Significant differences were found among the studied accessions of both species. • Ten-fruits weight varied from to g in C. pentagyna and to g in C. monogyna. Fruit weight was positively correlated with leaf and fruit dimensions, while it was negatively correlated with fruit density.

Highlights The chemistry of approximately 30 Crataegus species has been reported. The literature up to early is reviewed. The biological diversity of the genus Crataegus is outlined.

The traditional use and ethnobotany of the genus Crataegus are briefly described. A high degree of phytochemical diversity was exhibited in the flavonoid profiles. Hybridization between native and invasive species is of particular interest, indeed in their seminal review, Ellstrand & Schierenbeck () argue that hybridization (inter- and intra-specific) can act as a stimulus for the evolution of invasiveness.

It has also been suggested that the ‘high performance’ traits of invasive non-native plant species, which for example relate to physiology, various size characteristics, growth rate, fecundity and adaptiveness, confers an advantage over many native species, thereby helping them to rapidly colonize such environments (Jauni et al., ).

Introduction. Non-native species have to overcome numerous barriers to naturalize and become invasive in the introduced range (Richardson et al. ; Blackburn et al.

).While immediately after introduction into a new range the species need to cope with the local environment, especially climatic conditions (Wiens and Graham ), later on different mechanisms involving interactions, or. The guidebook, By Land and By Sea: Identification guide to non-native species for Minnesota, includes a list of invasive and non-native species with their key identification traits.

Some of these species have become common in parts of Minnesota with expanding ranges, while. Background Hybridization between native and invasive species can facilitate introgression of native genes that increase invasive potential by providing exotic species with pre-adapted genes suitable for new environments.

In this study we assessed the outcome of hybridization between native Senecio pinnatifolius var. pinnatifolius (dune ecotype) and invasive Senecio madagascariensis.For her thesis, Ms Purich studied hybridization between introduced Crataegus monogyna and native North American diploid species.

thesis, "Characterizing hybridization between native and non-native Crataegus species" Botany Department, University of Toronto,   Introduction. The introduction of non-native organisms into a habitat can bring about the extinction of related native species through competition and hybridization [1,2].In rivers in western North America, for example, native cutthroat trout breed with introduced rainbow trout and face local extinctions through competition and displacement by the resulting hybrids, although the two parent.