Catasetum ×Dunstervillei (Orchidaceae: Catasetinae), a Natural Hybrid Confirmed by Artificial Hybridization

Abstract Genetic analyses of reproductive barriers represent one of the few methods by which theories of speciation can be tested. However, genetic study is often restricted to model organisms that have short generation times and are easily propagated in the laboratory. Replicate hybrid zones with a diversity of recombinant genotypes of varying age offer increased resolution for genetic mapping experiments and expand the pool of organisms amenable to genetic study. Using 88 markers distributed across 17 chromosomes, we analyze the introgression of chromosomal segments of Helianthus petiolaris into H. annuus in three natural hybrid zones. Introgression was significantly reduced relative to neutral expectations for 26 chromosomal segments, suggesting that each segment contains one or more factors that contribute to isolation. Pollen sterility is significantly associated with 16 of these 26 segments, providing a straightforward explanation of why this subset of blocks is disadvantageous in hybrids. In addition, comparison of rates of introgression across colinear vs. rearranged chromosomes indicates that close to 50% of the barrier to introgression is due to chromosomal rearrangements. These results demonstrate the utility of hybrid zones for identifying factors contributing to isolation and verify the prediction of increased resolution relative to controlled crosses.

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Sedum ×estrelae(Gideon F.Sm. & R.Stephenson) Gideon F.Sm. (Crassulaceae): A New Combination for a Natural Hybrid inSedumSeriesRupestriaA.Berger (=PetrosedumGrulich) from Portugal

Haseltonia ◽

10.2985/026.021.0114 ◽

2015 ◽

Vol 21 ◽

pp. 95-96

Author(s):

Gideon F. Smith

Keyword(s):

New Combination ◽

Natural Hybrid

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Endoparasitic helminths of water frog complex in Poland: do differences exist between the parental species Pelophylax ridibundus and Pelophylax lessonae, and their natural hybrid Pelophylax esculentus?

Helminthologia ◽

10.2478/s11687-011-0020-8 ◽

2011 ◽

Vol 48 (2) ◽

pp. 108-115 ◽

Cited By ~ 4

Author(s):

M. Popiołek ◽

B. Rozenblut-Kościsty ◽

M. Kot ◽

W. Nosal ◽

M. Ogielska

Keyword(s):

20Th Century ◽

Parental Species ◽

Helminth Species ◽

Natural Hybrid ◽

Intensity Of Infection ◽

Water Frog ◽

Pelophylax Ridibundus ◽

Water Frogs ◽

Pelophylax Esculentus ◽

Cosmocerca Ornata

AbstractParasitic fauna of water frogs was mainly studied in the second half of the 20th century. However, these studies were done without differentiation into species and hybrids and pooled the 3 taxa as “water frogs” or “green frogs”. The aim of this study was to make an inventory of helminth species as well as their prevalence and intensity of infection in the two parental species (Pelophylax ridibundus and P. lessonae) and the hybrid (P. esculentus) of water frogs from 3 big populations composed of hundreds or thousands of individuals inhabited natural and seminatural landscapes in Poland. Eight helminth species were found: Polystoma integerrimum, Diplodiscus subclavatus, Opisthoglyphe ranae, Gorgodera cygnoides, Haematoloechus variegatus, Oswaldocruzia filiformis, Cosmocerca ornata and Acanthocephalus ranae. The results were compared with data from other, polish and European studies. Additionally we compared the level of infection among water frog taxa.

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Iris revolutaColas., natural hybrid origin species: characterization and preservation problems

Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology ◽

10.1080/11263500701872986 ◽

2008 ◽

Vol 142 (1) ◽

pp. 162-165

Author(s):

R. Accogli ◽

E. Nutricati ◽

L. Famà ◽

P. Medagli ◽

D. Manno ◽

...

Keyword(s):

Hybrid Origin ◽

Natural Hybrid

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Dacrydium ×suprinii, sp. nova – a natural hybrid ofDacrydium araucarioides ×D. guillauminii

Feddes Repertorium ◽

10.1002/fedr.200711126 ◽

2007 ◽

Vol 118 (1-2) ◽

pp. 51-59 ◽

Cited By ~ 5

Author(s):

P. Knopf ◽

H. Nimsch ◽

Th. Stützel

Keyword(s):

Natural Hybrid

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Ecological Observations on Hybrid Populations of European Plethodontid Salamanders, Genus Speleomantes

Diversity ◽

10.3390/d13070285 ◽

2021 ◽

Vol 13 (7) ◽

pp. 285

Author(s):

Enrico Lunghi ◽

Fabio Cianferoni ◽

Stefano Merilli ◽

Yahui Zhao ◽

Raoul Manenti ◽

...

Keyword(s):

Body Condition ◽

Parental Species ◽

Stomach Contents ◽

Trophic Niche ◽

Natural Hybrid ◽

Ecological Information ◽

Total Length ◽

Plethodontid Salamanders ◽

The Future ◽

First Time

Speleomantes are the only plethodontid salamanders present in Europe. Multiple studies have been performed to investigate the trophic niche of the eight Speleomantes species, but none of these studies included hybrid populations. For the first time, we studied the trophic niche of five Speleomantes hybrid populations. Each population was surveyed twice in 2020, and stomach flushing was performed on each captured salamander; stomach flushing is a harmless technique that allows stomach contents to be inspected. We also assessed the potential divergence in size and body condition between natural and introduced hybrids, and their parental species. Previously collected data on Speleomantes were included to increase the robustness of these analyses. In only 33 out of 134 sampled hybrid Speleomantes we recognized 81 items belonging to 11 prey categories. The frequency of empty stomachs was higher in females and individuals from natural hybrid populations, whereas the largest number of prey was consumed by males. We compared the total length and body condition of 685 adult salamanders belonging to three types of hybrids and three parental (sub)species. Three group of salamanders (one hybrid and two parental species) showed significantly larger size, whereas no difference in body condition was observed. This study provided novel ecological information on Speleomantes hybrid populations. We also provided insights into the potential divergence between hybrids and parental species in terms of size and body condition. We discuss our findings, and formulate several hypotheses that should be tested in the future.

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A natural intergeneric hybrid of Gesneriaceae from Brazil

Phytotaxa ◽

10.11646/phytotaxa.497.2.2 ◽

2021 ◽

Vol 497 (2) ◽

pp. 79-96

Author(s):

ANDRÉA ONOFRE DE ARAUJO ◽

MAURO PEIXOTO ◽

CINTIA NEVES DE SOUZA ◽

EDUARDO CUSTÓDIO GASPARINO ◽

JULIANA TOLEDO FARIA ◽

...

Keyword(s):

Chromosome Numbers ◽

Pollen Morphology ◽

Pollen Grains ◽

Intergeneric Hybrid ◽

Morphological Characters ◽

Natural Hybrid ◽

Pollen Data ◽

Cytological Data ◽

High Viability ◽

Structural Abnormalities

A natural hybrid between Goyazia and Mandirola (Gloxiniinae, Gesneriaceae) from Cerrado (Brazil) is here described, supported by pollen morphology, cytological data and morphological characters. The microsporogenesis of Mandirola hirsuta and that of the hybrid were analyzed in order to evaluate the cytogenetic characteristics. The haploid chromosome numbers observed were n = 12 for M. hirsuta and n = 11, 13, 16 and 26 for the hybrid. Structural abnormalities (monads, dyads, triads and micronuclei) were observed at the final of the hybrid’s meiosis. High viability rates of the pollen were recorded for Goyazia and Mandirola (>90%) and low viability for the hybrid (34.7%). The pollen grains were acetolyzed, measured and photographed for pollen morphology analysis. Quantitative pollen data were analyzed through descriptive and multivariate statistics. The hybrid has intermediate pollen characteristics between G. petraea and M. hirsuta; it is more related to G. petraea by the measures of diameters and ectoapertures; it is more similar to M. hirsuta mainly regarding the microreticulum on the mesocolpium region. The hybrid and Mandirola share vegetative and flower size, while the colors of the hybrid are similar to Goyazia. Pollen morphology, cytological data and morphological characters brought clear evidence for the recognition of the intergeneric hybrid, which we named as Goydirola x punctata.

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Begonia ×dinglensis, a natural hybrid of Philippine Begonia section Baryandra, as evidenced by morphological, phylogenetic and cytological data

Phytotaxa ◽

10.11646/phytotaxa.494.1.12 ◽

2021 ◽

Vol 494 (1) ◽

pp. 151-164

Author(s):

KOH NAKAMURA ◽

ROSARIO RIVERA RUBITE ◽

YOSHIKO KONO ◽

JELENE V. MACABASCO ◽

ARLENE D. TALAÑA ◽

...

Keyword(s):

National Park ◽

Natural Hybridization ◽

Rock Slopes ◽

Natural Hybrid ◽

Cytological Evidence ◽

Cytological Data ◽

Place Of Origin

Here we describe a natural hybrid of Philippine Begonia from Bulabog Puti-an National Park in Dingle, Iloilo, Panay Island. The hybrid, named Begonia ×dinglensis after its place of origin, grows on moist, coralline-rock slopes at 200 m elevation. Morphological, molecular, and cytological evidence support its origin from natural hybridization between Philippine endemics B. camiguinensis and B. nigritarum.

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