Holdfast

A holdfast is a root-like structure that anchors aquatic sessile organisms, such as seaweed, other sessile algae, stalked crinoids, benthic cnidarians, and sponges, to the substrate.

Holdfasts vary in shape and form depending on both the species and the substrate type. The holdfasts of organisms that live in muddy substrates often have complex tangles of root-like growths, while those of organisms that live in sandy substrates are bulb-like and very flexible, such as the holdfast of sea pens, allowing the organism(s) to pull the entire body into the substrate when the holdfast is contracted. The holdfasts of organisms that live on smooth surfaces (such as the surface of a boulder) have the base of the holdfast literally glued to the surface. The organism derives no nutrients from this intimate contact with the substrate, primarily because if the organism attempted to extract nutrients enzymatically from the substrate, the substrate would be eroded away, thereby increasing the risk of falling off the substrate.

Other articles related to "holdfast":

Holdfast Bay - European Settlement
... Holdfast Bay was the site of the landings in 1836 and 1837 by pioneers who were to set up the colony of South Australia ... and the proclamation of the new colony, the Holdfast Bay settlement became the first seat of government of South Australia ... government until mid-March 1837.) On 31 December 1836 the Holdfast Bay settlement was renamed Glenelg ...
Holdfast, Saskatchewan - Services
... Holdfast Bar R.M ... of Sarnia Holdfast Bank Long Lake Insurance and Promotional Prod ... Holdfast Post office Rogie Trucking Holdfast Library Old times Renewed Antigues Holdfast R.C ...
Royal School Of Military Engineering - Holdfast Training Services
... In a public private partnership (PPP) that will span 30 years, Holdfast Training Services Ltd and the RSME will modernise training and the management of training through the ... In August 2008 Holdfast Training Services Ltd, a consortium comprising Babcock Support Services Ltd (76%) and Carillion Private Finance (Defence) Ltd (24%), signed a 30-year Public Private ...
Charniodiscus
... The organism had a holdfast, stalk and frond ... The holdfast was bulbous shaped, and the stalk was flexible ... frond about 50 centimetres (20 in) above the holdfast ...
Canterbury Stakes - The Winners
... Rod 1937 - The Marne 1936 - Arachne 1935 - Bulldozer 1934 - Lough Neagh 1933 - Chatham 1932 - Holdfast 1931 - Holdfast 1930 - Holdfast 1929 - Amounis † Change in scheduling of race from spring to autumn ‡ Meeting ...