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Population: Groups of organisms of the same species: Guild: Interspecific groups of organisms carrying the same ecological function (i.e. herbivores). Community (or biocoenosis) Guilds from all biological domains, and their interactions in a specific location. Ecosystem: Groups of organisms in conjunction with the physical environment. Biome
[23] Hybridization among populations may increase population gene flow and reduce the effects of natural selection. [ 24 ] [ 25 ] Hybridization here is defined as when different but adjacent varieties of the same species (or generally of the same taxonomic rank ) interbreed, which helps overcome local selection. [ 1 ]
functional diversity (which is a measure of the number of functionally disparate species within a population (e.g. different feeding mechanism, different motility, predator vs prey, etc.) [12]) Biodiversity is most commonly used to replace the more clearly-defined and long-established terms, species diversity and species richness . [ 13 ]
[12] 2000–2009 saw approximately 17,000 species described per year. [12] The total number of undescribed organisms is unknown, but marine microbial species alone could number 20,000,000. [ 12 ] For this reason, the number of quantified species will always lag behind the number of described species, and species contained in these lists tend to ...
The list of organisms by chromosome count describes ploidy or numbers of chromosomes in the cells of various plants, animals, protists, and other living organisms.This number, along with the visual appearance of the chromosome, is known as the karyotype, [1] [2] [3] and can be found by looking at the chromosomes through a microscope.
[11] [12] Their contributions shaped ancient Greek natural philosophy. [13] [11] [12] [14] [15] Ancient Greek philosophers such as Aristotle (384–322 BCE) contributed extensively to the development of biological knowledge. [16] He explored biological causation and the diversity of life. His successor, Theophrastus, began the scientific study ...
Because the surface temperature of the ocean rises, these organisms move to deeper layers of the water column as they are temperature sensitive. [16] Due to this behavior, species of Ceratium are used as biological indicators because the deeper they are found in the water column, the greater the impact from global warming.
A cladistic analysis based on modern discoveries about the biology of these organisms supports a relatively close relationship with some photosynthetic organisms, such as brown algae and diatoms. A common taxonomic classification based on these data, places the class Oomycota along with other classes such as Phaeophyceae (brown algae) within ...