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Start/End Card Start with The physical characteristics of a habitat End with t-test An organism that can trap an inorganic carbon source (carbon dioxide) using energy from light or from chemicals Chi-squared test The maximum size of a population or a process that can be supported sustainably (that is over a long time period) in a particular habitat. Autotroph A statistical procedure used to determine whether the means of two samples differ significantly Climax community The final community in a succession. Carrying capacity Growing different crops in a field in successive years. Abiotic factors All of the living organisms of all species, and all of the non-living components, that are found together in a defined area and that interact with each other. Quadrat An increase in the nitrates, phosphates or organic content of aquatic systems. Habitat Crop or livestock production from land with little or no fertilizer added (less than 20kg per hectare per year). Yields are usually low Crop rotation 1 The conversion of gaseous nitrogen N2, into a more reactive form such as nitrate or ammonia. Intraspecific competition A term normally describing the whereabouts of an organism within an ecosystem Ecosystem An organism needing a supply of organic molecules as its carbon source. Fixation of nitrogen A fertiliser containing inorganic ions, such as nitrate, ammonium, potassium and phosphate ions. Eutrophication Competition between members of different species Heterotroph Competition between members of the same species Niche The one factor, of many affecting a process, that is nearest its lowest value and hence is rate-limiting Inorganic fertiliser The particular role filled by a species Organic fertiliser Farming without using synthetic chemicals as fertilisers or pesticides. Extensive farming 2 A fertiliser containing organic substances such as urea, for example farmyard manure or mushroom compost Pioneer plant A statistical procedure used to determine whether observed numbers or ratios differ significantly from those expected. Interspecific competition All the individuals of a species living in an area at the same time and that can interbreed with one another. Limiting factor An animal that feeds by killing other organisms Secondary succession The succession that occurs on an area where no living things were originally present. Organic farming A square area within which sampling of a community can take place. Transect The succession taking place in an area where some vegetation was already present. Population A plant which can colonise newly-cleared or disturbed ground. Predator A line along which sampling of a habitat is carried out. Primary succession 3