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Saturday, July 18, 2020 | History

2 edition of Translocations in natural populations of grasshoppers. found in the catalog.

Translocations in natural populations of grasshoppers.

Klaus Herman Rothfels

Translocations in natural populations of grasshoppers.

by Klaus Herman Rothfels

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Published .
Written in English


Edition Notes

Thesis (PhD) - University of Toronto,1948.

The Physical Object
Pagination1 v.
ID Numbers
Open LibraryOL19731427M

  Most grasshoppers do not reach populations that cause serious damage to agricultural crops and landscape plants, but the eastern lubber grasshopper (Romalea .   The geographical distribution of different B chromosome variants of this species has been extensively studied on the southeast Mediterranean coast of Spain and the presence of B chromosomes reported in almost all natural populations analyzed (Camacho et al. , Henriques-Gil et al. , Bakkali et al. ).

Very few translocated individuals were encountered during the post-translocation monitoring. The mean number of translocated reptiles was 98 (SE ). Of these, an average of (SE ) individuals or % of the population were captured during the monitoring. No recaptures of translocated reptiles were made at three (50%) of the study sites. With more than 2, classified genera species, grasshoppers are distributed widely all over the globe. Their habitat consists of regions with a plentiful supply of grass or other types of plants – the main food source for grasshoppers. Populations of the insect may be found in .

Importantly, the studies concerning population cytogenetics performed in the Australian grasshoppers Cryptobothrus chrysophorus (John & King a,b) and Atractomorpha similis (John & King , John et al. ) merit citation within the context of genetic large chromosome variability reported in these species, and the possibility of producing synthetic hybrids between. Chromosomal rearrangements can alter the rate and patterns of gene flow within or between species through a reduction in the fitness of chromosomal hybrids or by reducing recombination rates in rearranged areas of the genome. This concept, together with the observation that many species have structural variation in chromosomes, has led to the theory that the rearrangements may play a direct.


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Translocations in natural populations of grasshoppers by Klaus Herman Rothfels Download PDF EPUB FB2

So far, 63 natural populations from different habitats and latitudes have been chromosomally examined (Martí and Bidau a, b; Bidau and Martí ), and eight Rb translocations were identified among all 6 long autosomes (1/2, 1/4, 1/6, 2/4, 2/5, 3/4, 3/5, and 5/6).

There may be up to 4 different combinations in one population, which Cited by:   So far, 63 natural populations from different habitats and latitudes have been chromosom-ally examined (Martí and Bidau a, b; Bidau and Martí ), and eight Rb translocations were identified among all 6 long autosomes (1/2, 1/4, 1/6, 2/4, 2/5, 3/4, 3/5, and 5/6).

There may be up to 4 different combinations in one population, which Cited by: Abstract This review focuses on grasshoppers that are polymorphic for Robertsonian translocations because in these organisms the clarity of meiotic figures allows the study of both chiasma Author: Pablo Colombo.

Translocation in wildlife conservation is the capture, transport and release or introduction of species, habitats or other ecological material (such as soil) from one location to contrasts with reintroduction, a term which is generally used to denote the introduction into the wild of species from captive stock.

Translocation is an effective management strategy and important topic. The existence of chromosomal variation in T. mirus was revealed in an earlier study, with six out of seven plants showing deviations from the expected parentally additive karyotype (Lim et al., ).By applying an updated methodology that allows all individual chromosomes to be identified (Chester et al.,), we can now identify cytogenetic similarities and differences on a per Cited by:   Whitetail translocations have been, and continue to be, an important tool for population restoration and have resulted in amazing success stories for all types of big game animals across the world.

It is a tool now used primarily to remove nuisance deer, in. Genetic consequences of animal translocations: A case study using the As both natural and artificial formation of new populations may lead to genetic drift (founder effect), decreased genetic diversity and increased rates of inbreeding, genetic analyses can provide valuable information to evaluate the success of a relocation project.

Here are 3 of the best ways to keep grasshopper populations under control, and keep your garden and landscape safe from damage. 3 Simple Methods To Stop Grasshoppers #1 Raising Chickens.

Yes, believe it or not, grasshopper control is just one more reason for every backyard gardener to raise a. Even if you get rid of the present population in your garden or field, others may follow in a short while, causing frustrations for gardeners and farmers alike.

Symptoms of Grasshopper Damage Since adult grasshoppers will feed on a variety of vegetative plants, including grasses and weeds, the symptoms of grasshopper damage can be widespread. A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text.

Grasshoppers collected from roadside populations produced songs with low pitches that were slightly higher than the low pitches produced by grasshoppers from quiet fields. The biologists hypothesize that this shift enables roadside females to distinguish the low pitches in the males' calls from ambient noise.

Grasshopper optimization (GO) algorithm is a nature-inspired meta-heuristic optimization algorithm that was developed based on mimicking the hunting behavior of grasshoppers [38].Grasshoppers are considered one of the most harmful pests due to their damage to crop production and agriculture.

The life cycle of the grasshoppers starts with an egg phase, followed by a nymph phase, and further. References. Stebaev, “Periodic changes in the ecological distribution of grasshoppers in the temperate and the extreme continental steppe regions, and their importance for the local ecosystems,” in Proceedings of the International Study Conference on the Current and Future Problems of Acridology, pp.

–, Centre for Overseas Pest Research, London, UK, There are numerous historical examples of translocations introducing disease to native populations. Following the accidental introduction of the rinderpest virus to Africa with translocated cattle in the s the number of wildebeest in the Serengeti fell dramatically, leading to a subsequent fall in two important predator species - lion and.

Simple translocation: In this case, terminal segment of achromosome is integrated at one end of a non-homologousregion. Simple translocations are rather rare Shift: In shift, an intercalary segment of a chromosome isintegrated within a non-homologous chromosome.

Suchtranslocations are known in the populations ofDrosophila, Neurospora etc translocations have been implemented has increased to the point that an entire book is now dedicated to improving the practice (Ewen et al.

A complicated myriad of factors influence the success of translocations, including presence of threats that may have caused the original decline of the target population; habitat, demo. “Grasshoppers tend to be more problematic in rural areas, especially those surrounded by pastures or rangeland, or urban fringe areas containing large amounts of.

Grasshoppers eat large quantities of foliage both as adults and during their development, and can be serious pests of arid land and prairies. Pasture, grain, forage, vegetable and other crops can be affected.

Grasshoppers often bask in the sun, and thrive in warm sunny conditions, so drought stimulates an increase in grasshopper populations. Grasshoppers are ancient insects that have inhabited Earth for more than two million years. Their populations can explode after heavy rainfall, and.

ing translocations, when translocations occur between the geographically closest herds within lineages. Shaded areas indicate the three lineages identified in Figure Lineage 1 is shaded in red, lineage 2 is shaded in blue, lineage 3 is shaded in yellow. Arrows indicate the direction of translocations, from source to recipient.

Reciprocal chromosome translocations were proposed as a tool for bringing about high threshold population replacement in and However, translocations able to achieve this goal have only been reported once, in the spider mite Tetranychus urticae, a haplo-diploid species in which there is strong selection in haploid males for fit.

"Now we're going to coll 30, 40 at a time and we're going to go and rebuild populations." According to the Department of Conservation only about 10 percent of kiwi chicks survive to the age of six months. Stoats are responsible for more than half of kiwi chick deaths.kiowarange, and fourspotted grasshoppers.

Grasshoppers defoliate grasses by direct feeding on leaf and stem tissue and by cutting off leaves or stems and heads while feeding. High populations of grasshoppers on rangeland can damage plant crowns so severely that .