ENV 107
... The migration of one population of a species into a habitant previously occupied by another population is a process that lead to change in gene frequency. Even organisms that do not move themselves may have reproductive structures that migrate. For example, seeds of flowering plants for example ...
... The migration of one population of a species into a habitant previously occupied by another population is a process that lead to change in gene frequency. Even organisms that do not move themselves may have reproductive structures that migrate. For example, seeds of flowering plants for example ...
chapter 24
... However, this definition relies on subjective criteria, and researchers sometimes disagree about which structural features identify a species. ...
... However, this definition relies on subjective criteria, and researchers sometimes disagree about which structural features identify a species. ...
Species
... May occur with disruptive selection—individuals with certain genotypes prefer distinct microhabitats where mating takes place. This appears to be taking place with apple maggot flies. One group prefers to lay eggs on hawthorne fruits, the other group lays eggs on apples. They are partially reproduct ...
... May occur with disruptive selection—individuals with certain genotypes prefer distinct microhabitats where mating takes place. This appears to be taking place with apple maggot flies. One group prefers to lay eggs on hawthorne fruits, the other group lays eggs on apples. They are partially reproduct ...
Chapter 24 – The Origin of Species
... A small, isolated population is more likely to have its gene pool changed substantially over a short period of time by genetic drift and natural selection. ...
... A small, isolated population is more likely to have its gene pool changed substantially over a short period of time by genetic drift and natural selection. ...
Co-evolutionary dynamics on a deformable landscape
... latency is rather long. In this case both species are able to reach the local optimum if they happen to move towards the local optimum which lies in between the two species. As they are staying put on the local optimum the deformation of the landscape follows them which seriously reduces their fitne ...
... latency is rather long. In this case both species are able to reach the local optimum if they happen to move towards the local optimum which lies in between the two species. As they are staying put on the local optimum the deformation of the landscape follows them which seriously reduces their fitne ...
Transitioning Toward a Universal Species Concept for
... bacterial species in some genera such as Streptococcus as well as others [e.g., 7]. Since the process of speciation is an evolutionary process a sequence based, phylogenetic approach is well suited for the classification of species. Since the availability of genome sequences, their analyses have she ...
... bacterial species in some genera such as Streptococcus as well as others [e.g., 7]. Since the process of speciation is an evolutionary process a sequence based, phylogenetic approach is well suited for the classification of species. Since the availability of genome sequences, their analyses have she ...
plant pathology basics - College of Natural Resources
... species, biological species, provenences of strains, genotypes, genetic or allelic richness and genetic structure Mutations and recombinations drive evolution of DNA sequences. Isolation, drift, and selection lead to unique sequences associated with different species or isolated populations Isolatio ...
... species, biological species, provenences of strains, genotypes, genetic or allelic richness and genetic structure Mutations and recombinations drive evolution of DNA sequences. Isolation, drift, and selection lead to unique sequences associated with different species or isolated populations Isolatio ...
- Philsci
... The case of the Black-Capped Warblers is in principle the same as the case of the classical ring species (Irwin et al. 2005). In a ring species, several populations of a species are connected with each other by overlapping populations where the organisms interbreed. If such a connected chain in the ...
... The case of the Black-Capped Warblers is in principle the same as the case of the classical ring species (Irwin et al. 2005). In a ring species, several populations of a species are connected with each other by overlapping populations where the organisms interbreed. If such a connected chain in the ...
Distribution and diversity of aquatic protists: an evolutionary and
... new habitat that determine the distribution of species with their temporal (frequency and persistence of occurrence) and spatial (extention of occurrence) dimension. Temperature, salinity and pH are major physico-chemical variables controlling the occurrence of protist species (reviewed by Weisse 20 ...
... new habitat that determine the distribution of species with their temporal (frequency and persistence of occurrence) and spatial (extention of occurrence) dimension. Temperature, salinity and pH are major physico-chemical variables controlling the occurrence of protist species (reviewed by Weisse 20 ...
CHAPTER 24 THE ORIGIN OF SPECIES Introduction
... A species is a population or group of populations whose members have the potential to interbreed with each other in nature to produce viable, fertile offspring, but who cannot produce viable, fertile offspring with members of other species. ...
... A species is a population or group of populations whose members have the potential to interbreed with each other in nature to produce viable, fertile offspring, but who cannot produce viable, fertile offspring with members of other species. ...
Species distribution
Species distribution is the manner in which a biological taxon is spatially arranged. Species distribution is not to be confused with dispersal, which is the movement of individuals away from their area of origin or from centers of high population density. A similar concept is the species range. A species range is often represented with a species range map. Biogeographers try to understand the factors determining a species' distribution. The pattern of distribution is not permanent for each species. Distribution patterns can change seasonally, in response to the availability of resources, and also depending on the scale at which they are viewed. Dispersion usually takes place at the time of reproduction. Populations within a species are translocated through many methods, including dispersal by people, wind, water and animals. Humans are one of the largest distributors due to the current trends in globalization and the expanse of the transportation industry. For example, large tankers often fill their ballasts with water at one port and empty them in another, causing a wider distribution of aquatic species.Biogeography is the study of the distribution of biodiversity over space and time. It is very useful in understanding species distribution through factors such as speciation, extinction, continental drift, glaciation, variation of sea levels, river capture and available resources. This branch of study not only gives a description of the species distribution, but also a geographical explanation for the distribution of particular species. The traditional biogeographic regions were first modeled by Alfred Wallace in The Geographical Distribution of Animals (1876). These were based on the work of Sclater's terrestrial biogeographic regions. Wallace's system was based on both birds and vertebrates, including non-flying mammals, which better reflect the natural divisions of the Earth due to their limited dispersal abilities.