Results for “type”

powerhead

Type of submersible water pump normally used to create additional water flow in an aquarium. One or more may be installed depending on requirements.

Used in 274 profiles

river tank manifold

Home-made device used to achieve uni-directional flow in an aquarium when inhabitants naturally occur in high-velocity rivers and streams. Typically, one or more powerheads are located at one end of the aquarium with intakes at the opposite end, these being connected via pipework located under the substrate. Though certainly beneficial, this should not be considered an essential requirement in hill stream-type set-ups, however.

savanna

Type of grassland ecosystem characterised by any trees present being spaced in such a way that they do not form a closed canopy, thus sufficient light reaches the ground to support unbroken herbaceous cover consisting primarily of grasses. Also spelled 'savannah'.

Used in 10 profiles

seine

Type of net designed to hang vertically in the water with the ends being manually drawn together to catch fishes, and which usually has weights at the lower edge and floats at the top; to fish with such a net.

spawning substrate

Particular substrate type required by a given egg-laying fish species for the purpose of spawning.

Used in 9 profiles

stenophagy

Feeding on only a limited range of food types.

subjective synonym

Any of two or more taxonomic names whose synonymy is a matter of individual opinion, i.e., they are based on multiple name-bearing types.

Used in 6 profiles

tannin

Any of various yellowish or brownish solid compounds found in many plants and used for various commercial purposes. Derived from gallic acid and also known as tannic acid. Often present in water bodies with large amounts of decaying vegetation or where the underlying or surrounding soil contains peat and responsible for the typically brownish (tea-coloured) water in such environments and aquaria containing certain types of wood.

Used in 317 profiles

thallus

Type of plant body plant body lacking differentiatiation into root, stem, and leaf.

topotypical

Occurring at, of, or relating to the type locality of a given species.

trickle tower

Large filter particularly suitable for outdoor ponds and large aquaria, consisting of a series of vertically-arranged chambers filled with one or more types of media. Water is pumped to the top chamber where it is dispersed, most often using a spray bar. It then percolates down through the other chambers via gravity before being returned to the pond or aquarium.

várzea

Type of seasonally-inundated floodplain forest in the Amazon region. The term is normally used for those forests flooded by whitewater rivers but is sometimes used to refer to blackwater environments for which the more traditional term is igapó.

Used in 9 profiles

voucher specimen

Specimen housed in a permanent, usually museum, collection, ideally including detailed collection data such as date, location, etc.. Assigned a specific code in order in case later reference is required. May be a type specimen.

wet/dry filter

Type of filter normally placed under the aquarium, and often home-made. The basic premise is that water trickles vertically downards through separated compartments containing mechanical and biological filter media with spaces inbetween so that it is also exposed to the air briefly. It then collects in a base chamber or sump from where it is pumped back to the main aquarium. There are many commercial designs available, some of which are more effective than others. Not popular in marine reef aquaria due to the associated accumulation of nitrates as by-product.

allopatric speciation

Speciation event driven by some form of physical separation, e.g., the formation of new mountain ranges, followed by development of new genotypes and/or phenotypes.

Used in 2 profiles

breeding line

A group of identical, pure-breeding diploid or polyploid organisms, distinguished from others of the same species by a unique phenotype and genotype. Important in production of line breeding ornamental fish strains.

phenotypic plasticity

Ability of an organism to change its phenotype in response to environmental change.

Used in 2 profiles