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Galaxaura barbata 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Rhodophyta Florideophyceae Nemaliales Galaxauraceae

Scientific Name: Galaxaura barbata
Species Authority: R.Chou ex W.R.Taylor

Assessment Information [top]

Red List Category & Criteria: Critically Endangered (Possibly Extinct) A2ac ver 3.1
Year Published: 2007
Date Assessed: 2007-03-01
Assessor(s): Miller, K.A., Garske, L. & Edgar, G.
Reviewer(s): Stuart, S.N. & Carpenter, K.E. (Global Marine Species Assessment Coordinating Team)
Justification:
This alga was historically found at three sites by two different research groups, so once was probably moderately common, but has not been seen since 1963. The historic sites are now unsuitable for survival of this species due to habitat transformation to sea urchin barrens, at least for the shallower zones (13 to 18 m) at which the species was collected. Thus, records indicate a recent decline approaching 100%. The species is considered Possibly Extinct.
Date last seen: 1963

Geographic Range [top]

Range Description:Galaxaura barbata is endemic to the Galápagos Islands, only known from three collections: Floreana: Post Office Bay, collected in 1934 (Taylor 1945: type locality); Santa Cruz: no precise location reported in Taylor (1945); and Tortuga Bay collection from 1962 (Dawson 1963). There are no known records since 1963.
Countries occurrence:
Possibly extinct:
Ecuador (Galápagos)
FAO Marine Fishing Areas:
Possibly extinct:
Pacific – southeast
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Current population size and trends for G. barbata are not known, but substantial decline in extent of occurrence since 1963. Only known from three collections, with no records since 1963. This alga was historically found at three sites by two different research groups, so once was probably moderately common, but has not been seen since 1963. The historic sites are now unsuitable for survival of this species due to habitat transformation to sea urchin barrens, at least for the shallower zones (13 to 18 m) at which the species was collected.
Current Population Trend:Unknown
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:G. barbata dredged from rocky substrata at depths of 13 to 18 m; plus another record at 37 m depth (Taylor 1945). Shallow water (Dawson 1963).
Systems:Marine

Threats [top]

Major Threat(s): Presumably El Niño and climate change. Ecosystem interactions involving these two factors appear to have caused widespread decline in algal populations because of an increase in density of grazing sea urchins and other herbivores, following overexploitation of predators along with ENSO disturbances.

Conservation Actions [top]

Conservation Actions: Based on historical distribution, G. barbata occurs within the Galápagos Marine Reserve (IUCN category VI); Galápagos Archipelago Particularly Sensitive Sea Area (PSSA); Galápagos Island World Heritage Site (UNESCO N (i)(ii)(iii)(iv)), and Galápagos Island Man and Biosphere Reserve (UNESCO).

Citation: Miller, K.A., Garske, L. & Edgar, G. 2007. Galaxaura barbata. The IUCN Red List of Threatened Species 2007: e.T63651A12703033. . Downloaded on 27 May 2017.
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