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species
species
species 1. A group of organisms that resemble each other more than they resemble members of other groups and cannot be subdivided into two or more species. The precise definition of what constitutes a species differs depending on which species concept is applied. According to the
biological species concept, a species comprises a group of individuals that can usually breed among themselves and produce fertile offspring. However, many other species concepts have been proposed, including the
phylogenetic species concept and various
typological species concepts. Typically, a species consists of numerous local populations distributed over a geographical range. Within a species, groups of individuals become reproductively isolated because of geographical or behavioural factors (see
isolating mechanism), and over time may evolve different characteristics and form a new and distinct species.
2. A rank, or category, used in the
classification of organisms. Similar species are grouped into a genus, and a single species may be subdivided into
subspecies or
races. See also
binomial nomenclature.
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Species distributions in interdunal swale communities: The effects of soil waterlogging
Magazine article from: The American Midland Naturalist; 1/1/2001; ; 700+ words
; ...soil waterlogging in determining plant species distributions among interdunal swales...field and greenhouse experiments. Most species exhibited significant responses to experimental...distributions in the field. In general dune species such as Ammophila breviligulata and Solidago...
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SPECIES AND GENETIC DIVERSITY OF FAGACEAE IN NORTHERN THAILAND BASED ON ISSR MARKERS
Magazine article from: Journal of Tropical Forest Science; 1/1/2008; ; 700+ words
; ...amp; ANAMTHAWATJNSSON, K. 2008. Species and genetic diversity of Fagaceae in northern...Quercus, each with extensive diversity at species level._ A study area of about 550 km...Based on the morphological characters, 30 species were identified from diis collection...
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Different arbuscular mycorrhizal fungal species are potential determinants of plant community structure.
Magazine article from: Ecology; 9/1/1998; ; 700+ words
; ...structure, i.e., the diversity of plant species, their spatial distribution, and their...approximately]80% of all terrestrial plant species form this symbiosis (Smith and Read 1997...affecting the relative abundance of plant species and plant-species diversity (Grime...
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Endangered Species Law Undermined, Underfunded, Says Report
Newspaper article from: U.S. Newswire; 4/9/1992; 700+ words
; ...nation's law protecting endangered species has been "underapplied, underfunded...and fully implemented Endangered Species Act cannot "bear the full burden...policy which assures protection of species-rich habitat before the specie
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Species replacement during early secondary succession: the abrupt decline of a winter annual.
Magazine article from: Ecology; 3/1/1997; ; 700+ words
; ...numerous studies have described changes in species composition through time and have sought...the conditions under which they effect species replacement (Drury and Nisbet 1973...Walker et al. 1986, Halpern 1989) and species interactions (e.g., exploitative...
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Species and distribution of Penaeoid shrimps in Thailand.(Report)
Magazine article from: Journal of Shellfish Research; 12/1/2007; ; 700+ words
; ABSTRACT Species and distribution of Penaeoid shrimps in...Andaman Sea coast. Identification of species was based on the morphological characters...the current literature. A total of 50 species from 13 genera and 3 families of Penaeoidea...
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Estimating species richness: the importance of heterogeneity in species detectability.
Magazine article from: Ecology; 4/1/1998; ; 700+ words
; INTRODUCTION Estimating species richness (i.e., the actual number of species present in a given area) is the basic step of many...studies, count data (e.g., the total number of species recorded in an area at a given time) are used as...
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 "Rocky Mountain News (Denver, CO)")
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SPECIES OFF ENDANGERED LIST - FROM EXTINCTION BABBITT EMBARRASSED BY AGENCY'S BLUNDER.(News/National/International)
Newspaper article from: Rocky Mountain News (Denver, CO); 7/17/1998; 635 words
; ...Secretary Bruce Babbitt announced in May that 29 endangered species had recovered so well they could come off the endangered species list - proof, he said, ``the Endangered Species Act works.'' It turns out five of those species hadn't...
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Species assemblages and indicator species: the need for a flexible asymmetrical approach.
Magazine article from: Ecological Monographs; 8/1/1997; ; 700+ words
; ...identification of characteristic or indicator species is a traditional activity in ecology and...habitats, usually mention one or several species characterizing each habitat. So, it...accepted methods to identify indicator species have not been developed. The only widespread...
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Ecological species groups of South Carolina's Jocassee Gorges, southern Appalachian Mountains1
Magazine article from: Journal of the Torrey Botanical Society; 7/1/2004; ; 700+ words
; ...Clemson, SC 29634-0331 ). Ecological species groups of South Carolina's Jocassee...131: 220-231. 2004.-Ecological species groups, consisting of assemblages of co-occurring plant species exhibiting similar environmental affinities...
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Endangered Species Act
Book article from: Water:Science and Issues
Endangered Species Act The Endangered Species Act (ESA) has been described as the most comprehensive legislation for the preservation of endangered species ever enacted by any nation. It is also one of the United States...
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Invasive Species
Encyclopedia entry from: The Gale Encyclopedia of Science
Invasive Species An invasive species is an exotic species (one that has been deliberately or accidentally introduced into a habitat it would not normally populate) that thrives in its new environment, disrupting the natural ecosystem. The majority...
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Endangered Species
Encyclopedia entry from: UXL Encyclopedia of Science
Endangered species An endangered species is any animal or plant species whose very survival is threatened to the point of extinction. Once extinct, a species is no longer found anywhere on Earth. Once gone, it is gone forever. Throughout Earth...
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Species Extinction
Encyclopedia entry from: Encyclopedia of Public Health
SPECIES EXTINCTION Evolution is the interplay of...reason, they assume the status of separate species or subspecies. Historically, processes...exactly what the causes of extinction are. Species extinction could arise from a combination...
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Specie Payments, Suspension and Resumption of
Dictionary entry from: Dictionary of American History
SPECIE PAYMENTS, SUSPENSION AND RESUMPTION OF SPECIE PAYMENTS, SUSPENSION AND RESUMPTION OF. Under a system of specie payments, it is required by law or custom that fiduciary money, usually in the form of bank notes or government paper money...
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