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This species is chocolate brown in colour and is darker than all other bull kelp species. [4] [5] It has a branched stipe. [3] The species is non-buoyant and does not have 'honeycomb' in its fronds. [3] [4] The holdfast becomes large and spreads like a plate on rocky substrates. [6]
Holdfasts of D. antarctica are often inhabited by a diverse array of epifaunal invertebrates, many of which burrow into and graze on the kelp. [25] In New Zealand, epifaunal species include the crustaceans Parawaldeckia kidderi, P. karaka [25] and Limnoria stephenseni, and the molluscs Cantharidus roseus, Onchidella marginata, [26] Onithochiton ...
Species in the genus Durvillaea are also sometimes called "bull kelp", but this is just a shortening of the common name southern bull kelp. Durvillaea is a genus in the order Fucales and, though superficially similar in appearance, is not a true kelp (all of which are in the order Laminariales ).
Blades from southern bull kelp (rimurapa in Māori) [1] [2] [3] species such as Durvillaea antarctica and D. poha (named after the pōhā) [4] [5] were used to construct the bags. [1] The kelp blades have a 'honeycomb' structure, [ 6 ] [ 7 ] which allows them to be split open, hollowed out (pōhā hau) and inflated into containers.
[8] [9] Specimens of D. antarctica have been found to float for up to 210 days, during which time high wind speeds transport kelp rafts up to 10,000 km. [8] [9] Environmental factors such as temperature, solar radiation and surface winds (all of which vary with latitude) affect buoyancy of southern bull kelp rafts and their rate of travel. [8]
Nereocystis (Greek, 'mermaid's bladder') is a monotypic genus of subtidal kelp containing the species Nereocystis luetkeana. [1] Some English names include edible kelp, bull kelp, bullwhip kelp, ribbon kelp, bladder wrack, and variations of these names. [2]
The species can be confused with Durvillaea amatheiae, which has an overlapping geographic distribution. [1] [2] D. potatorum has a shorter, wider stipe with more limited lateral blade development, whereas D. amatheiae has a shorter, narrow stipe and typically prolific lateral blade development.
Critter of the Week is a regular Radio New Zealand broadcast in which Nicola Toki (originally of DOC, now Forest & Bird) and the host Jesse Mulligan talk about New Zealand species both endangered and neglected. It has been running since 2015, and has covered over 300 different species.