Property:Definition
From Coastal Wiki
This is a property of type Text. It links to pages that use the form MstConcept.
C
1) Sediment particles less than 0.004 mm in size (Wentworth, 1922). 2) A soft very fine-grained sedimentary rock composed primarily of clay-sized particles (Hiscock, 1996). +
Number of eggs laid at one time - in organisms that may lay eggs in one or more batches. +
1) Particle size 0.5 - 4 mm (Hiscock, 1996) +
Sediments composed of gravel and sand; inc. gravel, gravelly sand and sandy gravel (Long, 2006) +
Organisms that come together in large colonies (100 plus individuals) - often in the same area from season to season - usually for breeding purposes +
Symbiosis (q.v.) in which one species derives benefit from a common food supply, whilst the other species is not adversely affected (Lincoln ''et al.'', 1998). +
A species which is found in relatively moderate to high densities (accounts for non-discrete nature of abundance terms/parameters described here). +
Early larval stage in siphonophores, composed of a floating colony with disc-shaped float, and consists of a hollow sphere with aboral thickening (Stachowitsch, 1992). +
Common in OSPAR Regions II, III, IV +
Cone with a half sphere (Olenina ''et al.'', 2006). +
Where the species preys on native fauna or grazes on native flora. +
Free swimming larval stage, typically with five sub-stages, characterized by excretion through maxillary glands, and progressive increase in number of body segments and posterior appendages (see Stachowitsch, 1992). +
Deposition of sands formed by the breakdown to the skeletons of living organisms +
An organism that moves across, up or down the substratum via movements of its legs, appendages or muscles (e.g. ''Carcinus''). +
A narrow crack in hard substratum where penetration is deeper than the width at the entrance; a crevice is <10 mm wide at the entrance, while a fissure is >10 mm (Hiscock ,1996) +
A taxon is Critically Endangered when the best available evidence indicates that it meets any of the criteria A to E for Critically Endangered (see Section V), and it is therefore considered to be facing an extremely high risk of extinction in the wild. +
Forming or resembling a crust (Thompson, 1995) that is solid or resistant to touch or pressure e.g. encrusting coralline algae or sea mats such as ''Umbonula littoralis''. +
Forming or resembling a crust (Thompson, 1995) that yields to the touch or pressure e.g. the gelatinous colonies of ''Botryllus schlosseri'' or soft cushions of sponges such as ''Halichondria'' sp. +
Free-swimming spherical larva, composed of a simple gastrovascular system and short comb-rows; resembles typical adult ctenophore (see Stachowitsch, 1992, Ruppert & Barnes, 1994). +
With straight sides and a circular section (Thompson, 1995). +
Free-swimming bryozoan larva, the body is triangular, compressed and enclosed in a bivalve shell (see Ruppert & Barnes, 1994). +
Final lecithotrophic larval stage, characterized by bivalved carapace, compound eyes, prehensile antennules and thoraic appendages (cirri) (see Stachowitsch, 1992). +
D
Where the species degrades marine infrastructures or archaeological sites. +
A taxon is Data Deficient when there is inadequate information to make a direct, or indirect, assessment of its risk of extinction based on its distribution and/or population status. A taxon in this category may be well studied, and its biology well known, but appropriate data on abundance and/or distribution are lacking. Data Deficient is therefore not a category of threat. Listing of taxa in this category indicates that more information is required and acknowledges the possibility that future research will show that threatened classification is appropriate. It is important to make positive use of whatever data are available. In many cases great care should be exercised in choosing between DD and a threatened status. If the range of a taxon is suspected to be relatively circumscribed, and a considerable period of time has elapsed since the last record of the taxon, threatened status may well be justified. +
Min Value +
Where floating rafts of man-made materials become vectors for an invasive species. +
Living at or near the bottom of a sea or lake but having the capacity for active swimming (from Lincoln ''et al.'', 1998). +
Description of an organism's relationship with other organisms +
An organism that feeds on fragmented particulate organic matter within or on the substratum (adapted from Lincoln ''et al.'', 1998). +
Maximum to minimum recorded depth (expressed as metres below chart datum). +
The depth within the substratum at which the organism is found (max recorded in metres). +
Species detected in invasion pathways for example in ballast water, or as a hull-fouling organism. +
Species that have been recorded as present in the wild with no further information. +
An organism that feeds on fragmented particulate organic matter (detritus) (Lincoln ''et al.'', 1998). +
The length of a straight line passing from side to side through the centre of a body or figure, especially a circle or sphere.
Note: For diameter you can specify the measurement type (minimum, maximum, average), gender (male, female) and life stage. +
Description of dormant stage +
A life cycle characterized by a diploid adult stage producing haploid gametes by meiosis, the zygote forming by fusion of a pair of gametes (Lincoln ''et al.'', 1998). +
Development without a larval stage +
Potential for dispersal provided by one or more larval/juvenile stages, recorded in m, km. +
The distance over which the adult organism is able to roam, travel or disperse; the greatest potnetial or recorded distance. Does not acknowledge limitations due to geography, hydrography, or behavioural (territorial) constraints. +
Fields and traits that describe the distribution of the species. +
Second free-swimming larvae (after the auricularia) in the Holothuroidea. It is characterized by a series of flagellated rings around a barrel-shaped body (Ruppert & Barnes, 1994; Stachowitsch, 1992). +
A species which is very abundant or present at high densities or relatively high densities. +
Double cone (Olenina ''et al.'', 2006) +
Organisms that live vertically in the sediment, typically heads-up at the surface, and that ingest particles at the surface and egest them as faeces at depth in the sediment (adapted from Kristensen ''et al.'', 2012). +
seabird, cetaceans? +
E
Free-swimming larva of Echinoidea, distinguished by six pairs of arms, supported by skeletal rods (see Ruppert & Barnes, 1994; Stachowitsch, 1992). +
Collection of traits relating to species ecology +
Traits relating to how a species interacts with it's surrounding environment and other associated species. +
Traits that describe an physiological and environmental tolerance of an organism +
Parasitic on the outer surface of its host (adapted from Lincoln ''et al.'', 1998). +
Description of where fertilized eggs are placed or held +
Size (diameter) of macrogamete (egg or ovum) in µm, mm, cm. +
A marine inlet or harbour fully enclosed from the open sea except at the entrance, not normally open to the sea at two ends. The connection with the open sea is normally less restricted than is the case with lagoons (Hiscock, 1996). +
Forms or resembles a crust over a substratum or other organisms +
A taxon is Endangered when the best available evidence indicates that it meets any of the criteria A to E for Endangered (see Section V), and it is therefore considered to be facing a very high risk of extinction in the wild. +
Parasitic within the tissues or organs of its host (see Lincoln ''et al.'', 1998). +
A plant living within another plant (Lincoln ''et al.'', 1998) +
internal structure that supports the body of an organism +
Broad descriptors of the major environmental regions +
Position relative to substratum or fluid medium (air/water). +
Young, free-swimming medusa stage typically developing from attached scyphistoma or occasionally direct from a planula. Umbrella typically composed of eight, bifurcated arms (Stachowitsch, 1992). +
Living on the surface of the seabed. +
The photic zone, includes the open ocean influenced by light. The lower boundary is dependent on the depth of light penetration and is generally regarded extend to ca 200 m in depth. +
An organism that moves over the surface of sediment or lives at the sediment / water interface. +
Species that have been subject to an eradication event and have been confirmed as eradicated. +
Species that have been subject to an eradication event but have not been confirmed as eradicated. +
Species that have become established in their introduced range. +
Species that have become established in their introduced range and are known to be increasing in abundance and expanding their range. +
Species that have become established in their introduced range but are not known to be spreading aggressively. +
Downstream part of a river where it widens to enter the sea; often with significant freshwater influence and predominantly comprising sediment habitats. +
1) The region between the highest and lowest extent of the tide on the shore. 2) The shore zone between the lowest and highest seasonal water level in a lake (Lincoln ''et al.'', 1998) +
Pharynx can be everted to engulf and/or seize food items +
A rigid external structure that supports and/or protects the body of an organism and that is mainly completely secreted by the epidermis (derived from Lawrence 2005). +
