Results for “sp.”

peat swamp forest

Type of tropical moist forest lying over a thick bed of acidic peat, over 60% of which occur in Indonesia and Malaysia. Typically contain water with very low pH (<4.0) that is stained brown due to the release of various organic compounds from the decaying peat and thus often referred to as blackwater swamps. Usually contain some permanent water but also flood seasonally. Highly biodiverse when in pristine condition, with many species found nowhere else on earth, though increasingly subjected to intensive drainage, burning and subsequent conversion to agriculture in recent decades.

Used in 89 profiles

pectoral-fin

Anterior, paired fin attached to the pectoral girdle of fishes, usually just behind the opercle and corresponding to the forelimbs of higher vertebrates. Assists in controlling direction of movement and swimming speed. Frequently abbreviated to 'P' or 'P1' in scientific papers.

Used in 508 profiles

pH

Measure of the acidity or basicity of an aqueous solution. Pure water is said to be neutral, with a pH around 7.0, solutions with pH of less than 7.0 acidic and greater than 7.0 basic or alkaline. Measured on a logarithmic scale of 0.0-14.0 whereby a change of a single unit represents a ten-fold increase in acidity or basicity/alkalinity, i.e., a solution with a pH of 4.0 is ten times more acidic than one of 5.0., and 100 times more acidic than one of 6.0. Some fishes require a relatively specific pH in aquaria, while others are more generalised, with the former requirement often-reduced in captive-bred examples.

Used in 397 profiles

pheromone

Chemical secreted by an organism affecting the behaviour or physiology of other individuals of the same species which may function as an alarm or sexual stimulant, for example.

Used in 2 profiles

phylogenetics

The study of evolutionary relatedness among species or other groups of organisms. May be based on morphology, molecular data, or both.

Used in 3 profiles

phylogeny

The evolutionary development and history of a species or other taxonomic group. May be based on morphology, molecular data, or both.

Used in 52 profiles

planaria

Generic term applied to numerous non-parasitic flatworms of the class Turbellaria. Also a genus within that class, Planaria. Various species occur in aquaria where they're most often associated with accumulation of uneaten food or organic material and normally considered pests.

polyandry

Reproductive behaviour in which a female spawns with more than one male during the breeding season.

polygamy

Reproductive behaviour in which an individual spawns with more than a single partner during the breeding season.

polygyny

Reproductive behaviour in which a male spawns with more than one female during the breeding season.

Used in 1 profile

polymorphism

The occurrence of different forms, stages, or types in individuals or multiple organisms of the same species independent of sexual variation.

Used in 2 profiles

population

Group of individuals of a given taxon occupying a particular geographic area or specified habitat.

Used in 487 profiles

pseudobranch

Accessory or spurious gill, often located on the inner surface of the operculum in various fishes, that is usually small and sometimes completely obscured beneath the epithelium. Also referred to as pseudobranchia.

pseudotympanum

Translucent, triangular area in the humeral region, behind the opercle, without muscle and where the anterior part of the gas bladder is in direct contact with the skin. It is hypothesised to function as a hearing aid in many juvenile characoids and is present in adults of certain species, notably members of the family Cheirodontidae.

Used in 2 profiles

punctate

Having or marked with small spots, depressions, or holes.

pustule

Small, raised spot resembling a blister or pimple.

radial

In ichthyology, a bony or cartilaginous support for a fin ray or spine.

Used in 15 profiles

ramified

Split or divided into branches or constituent parts; with branches or extensions.

Used in 1 profile

ramify

To split into branches or constituent parts; to send forth branches or extensions.

redescription

New, updated, corrected or more complete version of a species description.

Used in 13 profiles