A5003314348- Genetic diversity and population structure
- Evolution and Genetic Dynamics
- Reproductive biology and impacts on aquatic species
- Fish Ecology and Management Studies
- Fish Biology and Ecology Studies
- Plant and animal studies
- Insect and Arachnid Ecology and Behavior
- Physiological and biochemical adaptations
- Animal Behavior and Reproduction
- Environmental Toxicology and Ecotoxicology
- Marine and fisheries research
- Species Distribution and Climate Change
- Aquaculture Nutrition and Growth
- Fish biology, ecology, and behavior
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Ecology and Vegetation Dynamics Studies
- Aquaculture disease management and microbiota
- Heat shock proteins research
- Chromosomal and Genetic Variations
- Animal and Plant Science Education
- Myxozoan Parasites in Aquatic Species
- Rangeland and Wildlife Management
- Rangeland Management and Livestock Ecology
- Insect and Pesticide Research
- Fossil Insects in Amber
Senckenberg Museum für Naturkunde Görlitz
2016-2025
Intel (Taiwan)
2019
Universität Greifswald
2005-2007
University of Connecticut
1984-1997
American Museum of Natural History
1970-1985
Rutgers, The State University of New Jersey
1985
Cornell University
1985
Southern Methodist University
1974
Institut für Umwelttechnologien und Strahlenschutz (Germany)
1973
University of Michigan
1959-1970
The discovery of a second gynogenetic, triploid "species" in the genus Poeciliopsis is reported. This all-female form part five-fish hybrid complex from Rio Fuerte northwestern Mexico. consists two bisexual species, P. monacha and lucida, three unisexual derivatives, which are one diploid. 2n approximates 1n lucida. During oogenesis paternally derived lucida chromosomes lost; thus it primarily set that transmitted to egg. Since allfemale mates mainly with males nature this fish maintained....
Adaptations for placing a maximum number of mature offspring in the next generation fall between two adaptive extremes having either high reproductive rates and low survival or rates. Among fishes, both have been realized; example, ling, Molva molva may produce 20-30 X 106 eggs at single spawning (Blaxter, 1969), whereas some species viviparous fishes only one to four well-developed young time. variable adaptations teleosts, remarkable array is found within family Poeciliidae. All but 150...
By hybridizing bisexual (gonochoristic) fishes, all-female clones have been produced that are comparable to those of a wild unisexual "species," Poeciliopsis monacha-lucida , living in northwestern Mexico. The laboratory unisexuals consistently given birth only female progeny for six generations.
Three all-female strains of the viviparous fish Poeciliopsis occur in Río Fuerte Sinaloa, Mexico. lucida , a bisexual species, provides sperm for these monosexual forms which I designate as Cx, Cy, and Cz. Form Cy is triploid that when test-mated to males various species produces all-female, offspring devoid paternal characters. Both Cx Cz are diploid express characteristics both parents.
SYNOPSIS. Two genera of fishes, Poecilia and Poeciliopsis, both in the family Poeciliidae, have established unisexual populations. One "species," formosa, is a diploid form that relies upon sperm from latipinna or P. mexicana to initiate parthenogenetic development (gynogenesis). Triploid individuals formosa also been discovered but mode reproduction significance such fish natural populations yet be established. In genus Poeciliopsis three gynogenetic triploids are known. Each superimposed...
The adaptive value of sexual reproduction is not well understood. Numerous authors have attempted to identify the reasons for its widespread occurrence in both plants and animals but conflicting opinions emerged (see Williams, 1975, a review). Discussions been largely theoretical entirely debatable because little or no concrete data available. Widespread use electrophoresis recent years has revealed much about genetics populations; yet known asexual species. effects on genetic structure...
A genetic analysis of population structure in the unisexual fish, Poeciliopsis monacha-lucida, was conducted using protein phenotypes encoded by 22 loci. The all-female populations arose hybridization between P. monacha and lucida narrow zones where their ranges overlap. hybrids are sustained mating with males phenotypically intermediate, expressing both maternal paternal traits. However, only (P. monacha) set chromosomes is transmitted through oogenesis these hybrids; recombination does not...
Journal Article REPRODUCTIVE MECHANISM OF UNISEXUAL AND BISEXUAL STRAINS THE VIVIPAROUS FISH POECILIOPSIS Get access R. Jack Schultz Museum of Zoology The University Michigan Search for other works by this author on: Oxford Academic Google Scholar Evolution, Volume 15, Issue 3, 1 September 1961, Pages 302–325, https://doi.org/10.1111/j.1558-5646.1961.tb03157.x Published: 01 1961 history Received: 12 1960
1. Hybridization experiments between an all-female fish, Poeciliopsis "Cx," and the males of two bisexual species, P. lucida latidens, have provided genetic evidence that hereditary materials both mother father combine to form F, progeny. The entire male genome, however, appears be simply "on loan" for each generation. None male's chromosomes, apparently, are incorporated in ova; thus, integrity maternal line is maintained, even though forced rely on sperm from other species maintain...
The cellular basis of contracture the palmar fascia in patients who have Dupuytren disease involves generation intracellular force and transmission this to surrounding tissue. A specialized cell, myofibroblast, supposedly generates force. Recently published studies from our laboratory demonstrated that cytoskeleton myofibroblast contains non-muscle myosin not smooth-muscle myosin, suggesting it utilizes a contractile system. In addition, these identified extracellular glycoprotein...
Hybrids between Phoxinus eos and P. neogaeus are common, can occur in the absence of one parent species, almost exclusively female. Analyses hybrids from eight localities eastern North America indicate that these constitute a unisexual hybrid species. Tissue grafts among diploid East Inlet, Coos Co., New Hampshire accepted, indicating unisexuals genetically identical, must be products clonal reproduction. Chromosome counts isozyme banding patterns reveal presence both triploid at all...
Hybrids of the daces Phoxinus eos and P. neogaeus occur throughout northern United States southern Canada. Diploid hybrids some diploid-triploid mosaic from East Inlet Pond, Coos County, New Hampshire, produce diploid all-identical ova eos-neogaeus that develop into young if sperm either parental species serves only to stimulate development but triploid or genome is actually incorporated. The hybrid population at Pond appears be perpetuated by this unique form sperm-dependent, clonal...
In addition to the viviparous fish Mollienesia formosa, two other species of poeciliids have recently been found produce only female offspring. The young these females, however, unlike those M. inherit characteristics from any one several males used in experimental matings.
Analysis of the heat-shock proteins (hsps) six closely related species Poeciliopsis demonstrated existence biochemical diversity in hsp100, hsp70, hsp60, and hsp30 protein families among species. Each expressed five to seven hsp70-related isoforms. Constitutive 70-kD isoforms were identical species, but four different patterns heat-inducible seen these Members hsp70 family molecular chaperones are included most highly conserved known, possibility variation has rarely been addressed. The is...
A diploid all-female fish of the genus Poeciliopsis (Poeciliidae) inhabits Rio Fuerte northwestern Mexico. From both morphological and biochemical studies, it is clear that this form, designated P. monachalucida (Schultz, 1969), arose by hybridization between monacha lucida. 1969; Vrijenhoek, 1972). Unisexual populations persist in nature mating with males lucida; such matings result progeny maternal paternal traits. All-femaleness maintained from one generation to next a unique reproductive...