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This is a property of type Text. It links to pages that use the form MstConcept.

Pages using the property "Definition"

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Absent +Species that were reported at some time to be present but were not recorded subsequently are reported to be ‘Absent’.  +
Abundance +Abundance and population trends of species populations have been recorded where this information was available.  +
Abyssobenthic +Occupying the ocean floor from ca 4000 - 6000 m depth. Usually a more or less flat plain (Lincoln ''et al.'', 1998).  +
Abyssopelagic +Overlays the plains of the major ocean basins with a lower boundary of ca 6000 m.  +
AccessoryFeedingStructures +Other structures such as palps, tentacles or a radiolar crown ("grooved palps"). There are forms of single pair of grooved palps nearly always attached dorsally or near the junction of the prostomium and peristomium, or multiple grooved palps sometimes forming a crown. Dorso lateral ciliated folds in the roof of the buccal cavity may be present in some polychaetes.  +
Accretion +An organism that constructs reefs or raised beds of accreted materials, e.g. bound sand in ''Sabellaria'' spp.  +
Actinula +Crawling larval stage of some hydoids (amend)  +
Adult +The reproductively capable (mature), fully formed, usually longest lived, stage of an animals life cycle.  +
AdultBody +Attached or stuck to adult but not held in specialised appendage / receptacle  +
AdultBurrow +Eggs are placed or retained within the parents burrow  +
Adverse habitat modification +Where the species physically alters the nature of the strata/habitat.  +
AgeAtMaturity +Age recorded in days, months, years.  +
Aggregations +An organism that constructs reefs and raised beds due to aggregation of large numbers of individuals via permanent or semi-permanent attachment e.g. mussels, oysters and ''Crepidula'' beds.  +
AlgalGravel +Constructs deep beds of calcareous algal nodules, e.g. maerl beds  +
Alien +Species introduced by man into places out of their natural range of distribution.  +
AlphaHaline +36-40 psu  +
AlphaMesohaline +10-<18 psu  +
AlphaOligohaline +3-<5 psu  +
AlphaPolyhaline +25-<30 psu  +
AlternationOfGenerations +The alternation of generations, in the life cycle of an organism, that exhibit different modes of reproduction; typically sexual (diploid) and asexual (haploid) phases. Also termed metagenesis (Lincoln ''et al.'', 1998) (e.g. ''Daphnia'', some rotifers)  +
Alters bio-geochemical/hydrologic cycles +Where the species alters the nature of chemical or water cycles.  +
Alters trophic interactions +Where the species alters food web dynamics.  +
Ambusher +Sedentary or sessile predators, that wait for prey to come to them, and may or may not use a final pounce, traps or lures (e.g. sea anemones, large hydroids, spiders)  +
AmorphousCaCO3 +calcium carbonate that lacks a crystalline structure, or whose internal is so irregular that there is no characteristic external form. The term does not preclude the existence of any degree of order (Derived from Neuendorf et al. 2005)  +
Amphiblastula +A poriferan larva, composed of a hollow ball of cells, with one hemisphere ciliated (Ruppert & Barnes, 1994).  +