Durvillaea
Durvillaea | |
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Durvillaea antarctica and D. willana on Taieri Island | |
Scientific classification ![]() | |
Clade: | SAR |
Phylum: | Ochrophyta |
Class: | Phaeophyceae |
Order: | Fucales |
Family: | Durvillaeaceae (Oltmanns) De Toni |
Genus: | Durvillaea Bory |
Type species | |
D. antarctica | |
Species | |
See text |
Durvillaea is a genus of large brown algae in the monotypic family Durvillaeaceae. All members of the genus are found in the southern hemisphere, including Australia, New Zealand, South America, and various subantarctic islands.[2][3] Durvillaea, commonly known as southern bull kelps, occur on rocky, wave-exposed shorelines and provide a habitat for numerous intertidal organisms.[4][5] Many species exhibit a honeycomb-like structure in their fronds that provides buoyancy, which allows individuals detached from substrates to raft alive at sea, permitting dispersal for hundreds of days over thousands of kilometres.[3][6] Durvillaea species have been used for clothing, tools and as a food source by many indigenous cultures throughout the South Pacific, and they continue to play a prominent role in Chilean cuisine.[3]
Common name and etymology[]
The common name for Durvillaea is southern bull kelp, although this is often shortened to bull kelp, which can generate confusion with the North Pacific kelp species Nereocystis luetkeana.[7][8]
The genus is named after French explorer Jules Dumont d'Urville (1790-1842).[9]
Description[]
Durvillaea species are characterised by their prolific growth and plastic morphology.[10]
Two species, D. antarctica and D. poha are buoyant due to a honeycomb-like structure in the fronds of the kelp that holds air.[3][11] When these species detach from the seabed, this buoyancy allows for plants to drift for substantial distances, permitting long distance dispersal.[3][12] In contrast, species as D. willana lack such 'honeycomb' tissue and are non-buoyant, preventing the plants from moving long distances.[12]
Ecology[]
Durvillaea bull kelp grow within intertidal and shallow subtidal areas, typically on rocky wave-exposed coastal sites.[10] D. antarctica and D. poha are intertidal, whereas D. willana is subtidal (to 6 m depths).[13] Intertidal species can grow at the uppermost limit of the intertidal zone if there is sufficient wave wash.[14] Species can withstand a high level of disturbance from wave action,[10] although storms can remove plants from substrates.[15][16][17]
- D. antarctica growing at Boom Rock, Wellington
- D. antarctica at Manurewa Point, in the Wairarapa
- D. fenestrata growing in the Antipodes Islands
- Durvillaea kelp on Enderby Island
Epibionts, parasites and rafting[]
![](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Durvillaea_beachcast1.jpg/220px-Durvillaea_beachcast1.jpg)
Holdfasts of D. antarctica and other species are often inhabited by a diverse array of epifaunal and infaunal invertebrates, many of which burrow into and graze on the kelp.[4][5] In New Zealand, species that inhabit Durvillaea include the sea-star , crustaceans such as , ,[5] and the gribbles [5] and , as well as the molluscs Cantharidus roseus, Onchidella marginata,[18] Onithochiton neglectus,[19][5] and Sypharochiton sinclairi,[15][16][17] and the spider Desis marina.[20][21]
Durvillaea plants can detach from substrates, particularly during storms. Once detached, buoyant species such as D. antarctica and D. poha can float as rafts, and can travel vast distances at sea, driven by ocean currents. 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.[6] 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.[6] Rafts of D. antarctica are more likely to disperse offshore if plants detach during outgoing tides during autumn and winter.[22] Kelp-associated invertebrates can be transported inside of drifting kelp holdfasts, potentially leading to long-distance dispersal and a significant impact upon the population genetic structure of the invertebrate species.[15][16][17][18][19]
Rafts of Durvillaea can be colonised by the goose barnacles Lepas australis and L. pectinata. Beachcast, decomposing bull-kelp is colonised and consumed by a wide variety of invertebrates including sandhoppers Bellorchestia quoyana,[23] and kelp flies Chaetocoelopa littoralis.
Other seaweeds including , , Corallina officinalis var. chilensis, and also grow as epiphytes in the holdfasts of D. antarctica.[24] Rafting on D. antarctica appears to have influenced the dispersal and phylogeography of these non-buoyant species.[24][25] In New Zealand, Durvillaea fronds can also be infected by the obligate red algal epiphyte Pyrophyllon subtumens (J. Agardh ex R.M. Laing) W.A. Nelson 2003.[26][27]
Fronds of D. antarctica can be infected by an endophytic, phaeophycean algal parasite (Lindauer) G.R. South.[28][29] Fronds can also be infected Maullinia, a genus of intracellular, protistan parasites.[30][31][32] Based on genetic evidence, both H. durvillaeae and Maullinia have likely been dispersed across the Southern Hemisphere via rafting bull kelp.[29][30][32][33]
- Cross-section of a D. antarctica frond, showing Pyrophyllon subtumens growing on the outer surface
- Beachcast D. antarctica kelp frond with blisters caused by an infection
- A detached holdfast of D. antarctica found off Chile, colonised by the goose barnacle Lepas australis
Environmental stressors[]
Increased temperatures and heatwaves, increased sedimentation, and invasive species (such as Undaria pinnatifida) are sources of physiological stress and disturbance for members of the genus.[34]
A marine heatwave in the summer of 2017/18 appears to have caused the local extinction of multiple Durvillaea species at Pile Bay, on the Banks Peninsula.[35] Once the kelp was extirpated, the invasive kelp Undaria pinnatifida recruited in high densities.[35]
Disturbance from earthquake uplift[]
Earthquake uplift that raises the intertidal zone by as little as 1.5 metres can cause Durvillaea bull kelp to die off in large numbers.[12][36][37] Increased sedimentation following landslides caused by earthquakes is also detrimental.[36][37] Once an area is cleared of Durvillaea following an uplift event, the bull kelp that re-colonises the area can potentially originate from genetically distinct populations far outside the uplift zone, spread via long distance-dispersal.[38]
Intertidal species of Durvillaea can be used to estimate earthquake uplift height, with comparable results to traditional methods such as lidar.[14] However, since Durvillaea holdfasts often grow at the uppermost limit of the intertidal zone, these uplift estimates are slightly less accurate compared to measures derived from other intertidal kelp such as Carpophyllum maschalocarpum.[14]
Chile[]
The 2010 Chile earthquake caused significant coastal uplift (~0.2 to 3.1 m), particularly around the Gulf of Arauco, Santa María Island and the Bay of Concepción.[39] This uplift caused large scale die offs of D. antarctica and dramatically affected the intertidal community.[39] The damage to infrastructure and ecological disturbance caused by the earthquake was assessed to be particularly damaging for seaweed gatherers and cochayuyo harvest.[40]
New Zealand[]
Akatore[]
Duvillaea bull kelp diversity appears to have been affected by uplift along the . Phylogeographic analyses using mitochondrial COX1 sequence data and genotyping by sequencing data for thousands of anonymous nuclear loci, indicate that a historic uplift event (800 – 1400 years before present) along the fault zone and subsequent recolonisation, has left a lasting impact upon the genetic diversity of the intertidal species D. antarctica and D. poha, but not on the subtidal species D. willana.[13][41] Such a genetic impact may support the founder takes all hypothesis.[13][41] Further genetic analysis has revealed that the population structure of two epifaunal species, the gribble and the chiton O. neglectus, closely matches the pattern observed in the intertidal host species of Durvillaea along the Akatore fault zone.[5] However, no matching pattern was observed for another epifaunal species, the amphipod , most likely because this species has better swimming potential and can rely upon other host seaweeds.[5]
Kaikōura[]
A substantial die off of Durvillaea bull kelp occurred along the Kaikōura coastline following the 2016 Kaikōura earthquake, which caused uplift up to 6 metres.[14][4][36][37][38] The loss of Durvillaea kelp caused ecological disturbance, significantly affecting the biodiversity of the local intertidal community.[36][37] Aerial drone imaging two years after the earthquake indicated that Durvillaea abundance remained low on reefs with significant uplift, but it revealed offshore refuge populations less frequently detected by field researchers.[42] Areas Genetic analysis indicated that some of the Durvillaea that subsequently reached the affected coastline (i.e. potential colonists) came from areas >1,200 kilometres away.[38]
Wellington and the Wairarapa[]
Based on genetic data, the predominantly southern-restricted species D. poha appears to have undergone a recent range expansion into the North Island, as it can be found at low frequencies along the Wellington coastline.[43] This range expansion coincides with areas affected by tectonic uplift and landslides caused by historic earthquakes, including the 1855 Wairarapa earthquake.[43] The removal of D. antarctica and formation of new coastline by such tectonic disturbance likely provided an ecological opportunity for D. poha to successfully colonise coastline north of the Cook Strait.[43]
It has been hypothesised that gaps in the current geographic range of D. willfana around Wellington and the Wairarapa may have been caused by local extinction following historic earthquake uplift events such as the 1855 Wairarapa earthquake.[12] However, uplift along the Akatore fault zone does not appear to have significantly affected the genetic diversity of D. willana in that region.[13] The interpretation of this genetic result for Akatore was that earthquake uplift is likely insufficient to cause the complete extirpation of subtidal kelp species such as D. willana.[13]
- A die off of exposed Durvillaea kelp following uplift caused by the 2016 Kaikōura earthquake
- Durvillaea kelp and other seaweeds exposed by earthquake uplift at Kaikōura
- Uplifted shoreline at Ward Beach (photographed in 2020), with D. antarctica growing in the new intertidal zone
- D. antarctica on Turakirae Head, with the raised beach in the background
Species and distribution[]
There are currently eight recognised species within the genus, and the type species is D. antarctica.[1] All species are restricted to the Southern Hemisphere and many taxa are endemic to particular coastlines or subantarctic islands.
- Durvillaea amatheiae , G.J. Edgar, S.C. Banks, J.M. Waters & C.I. Fraser, 2017,[44] endemic to southeast Australia.[3][44]
- Durvillaea antarctica (Chamisso) Hariot,[1] found in New Zealand, Chile and various subantarctic islands including Macquarie Island.[2][23][3][8][10][11][41][45][46]
- Durvillaea chathamensis C.H.Hay, 1979,[46] endemic to the Chatham Islands.[3][8]
- Durvillaea fenestrata C. Hay, 2019,[3] endemic in the subantarctic Antipodes Islands.[3][8]
- Durvillaea incurvata () Macaya,[3] endemic to Chile.[3]
- Durvillaea poha C.I. Fraser, H.G. Spencer & J.M. Waters, 2012,[11] endemic to South Island of New Zealand, as well as the subantarctic Snares and Auckland Islands.[3][8][11][45]
- Durvillaea potatorum (Labillardière) Areschoug, endemic to southeast Australia.[7][8][47]
- Durvillaea willana Lindauer, 1949,[48] endemic to New Zealand.[2][3][8][12][46][48]
Evolution[]
A time-calibrated phylogeny of Durvillaea based on four mitochondrial and nuclear DNA markers (COI, rbcL, 28S and 18S) indicates the evolutionary relationships shown in the cladogram below.[3][8] Notably, additional unclassified lineages were estimated within D. antarctica.[3][8] Mitochondrial introgression has been observed between two species, where some plants with nuclear DNA of D. poha exhibited mitochondrial DNA belonging to D. antarctica.[43]
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Use of Durvillaea species[]
Australia[]
D. potatorum was used extensively for clothing and tools by Aboriginal Tasmanians, with uses including material for shoes and bags to transport freshwater and food.[49][50] Currently, D. potatorum is collected as beach wrack from King Island, where it is then dried as chips and sent to Scotland for phycocolloid extraction.[51]
Chile[]
D. antarctica and D. incurvata have been used in Chilean cuisine for salads and stews, predominantly by the Mapuche indigenous people who refer to it as collofe or kollof.[3][52] The same species is also called cochayuyo (cocha: lake, and yuyo: weed), and hulte in Quechua.[3][40][53] The kelp harvest, complemented with shellfish gathering, supports artisanal fishing communities in Chile.[53] Exclusive harvest rights are designated using coves or caletas, and the income for fishers (and their unions) often depends upon the sale of cochayuyo.[53]
New Zealand[]
Māori use D. antarctica (rimurapa) and D. poha to make traditional pōhā bags, which are used to transport food and fresh water, to propagate live shellfish, and to make clothing and equipment for sports.[54][55][56] Pōhā are especially associated with Ngāi Tahu and are often used to carry and store muttonbird (tītī) chicks.[54][55] The Ngai Tahu Claims Settlement Act 1998 protects Durvillaea bull kelp from commercial harvesting within the tribe's traditional seaweed-gathering areas.[57]
People living in coastal Otago and Southland have also traditionally carved bouncing balls, including cricket balls, out of the solid stipes of Durvillaea.[58][59]
- Cochayuyo (D. antarctica) for sale in Chile
- Cochayuyo salad
References[]
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- ^ Kelp Industries (August 2004). "Proposal for the harvest and export of native flora under the Environment Protection and Biodiversity Conservation Act 1999" (PDF).
- ^ Stuart, Jim (15 April 2010). "Seaweed: Cochayuyo and Luche". Eating Chilean.
- ^ a b c Gelcich, Stefan; Edwards-Jones, Gareth; Kaiser, Michel J.; Castilla, Juan C. (2010). "Co-management Policy Can Reduce Resilience in Traditionally Managed Marine Ecosystems". Ecosystems. 9: 951–966. doi:10.1007/s10021-005-0007-8.
- ^ a b "Page 4. Traditional use of seaweeds". Te Ara: The Encyclopedia of New Zealand. 12 Jun 2006. Retrieved 19 November 2019.
- ^ a b "Traditional Māori food gathering". Museum of New Zealand Te Papa Tongarewa. Retrieved 21 November 2019.
- ^ "Maori shellfish project wins scholarship". SunLive. 13 May 2018. Retrieved 26 November 2019.
- ^ "Durvillaea antarctica". New Zealand Plant Conversation Network. 10 July 2020. Retrieved 10 July 2020.
- ^ "Maggy Wassilieff, 'Seaweed - Kelp', Te Ara - the Encyclopedia of New Zealand: Kelp Ball". Te Ara: The Encyclopedia of New Zealand. 12 Jun 2006. Retrieved 3 January 2021.
- ^ "Rakiura Stewart Island, From Nine To Noon 31 August 2009: Off the beaten track on Rakiura Stewart Island". Radio New Zealand. 31 August 2009. Retrieved 3 January 2021.
Further reading[]
- Adams, N.M. (1994). Seaweeds of New Zealand. Canterbury University Press. ISBN 978-0908812219.
- Morton, J.W.; Miller, M.C. (1973). The New Zealand Seashore. Collins.
External links[]
- Algaebase: Durvillaea Bory, 1826
- Museum of New Zealand Te Papa Tongarewa: Durvillaea (Genus)
- Critter of the Week NZ Bull Kelp (Critter of the Week)
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Wikispecies has information related to Durvillaea. |
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Wikimedia Commons has media related to Durvillaea. |
- Fucales
- Fucales genera