Overview

Distribution

Range Description

Sargassum albermarlense is an endemic species from the Galápagos Islands. Prior to 1983, reported from:
Fernandina: Punta Espinosa (Taylor 1945, Wellington 1975). Isabela: Punta Albermarle (Taylor 1945: type locality) and Tagus Cove (Taylor 1945). Santiago: Bartolome (Taylor 1945). Santa Cruz: Tortuga Bay (1972 CDS), Academy Bay (Wellington 1975).

After 1983, reported from:
Fernandina: Punta Espinosa (CDRS record 2002), Cabo Douglas, Punta Mangle (1995 CDS) and southern coast of Fernandina (CDRS record 2003). Isabela: Cabo Berkeley, Caleta Iguana (CDRS record 2004), Caleta Tagus (CDRS record 2002), Castles (CDRS record 2004). Floreana: Post Office Bay (CDRS record 2001). Santa Cruz: Tortuga Bay (1994 CDS).
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Physical Description

Type Information

Type locality: Pta. Albemarle, Isla Isabela, Gal‡pagos Islands, Ecuador
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
S. albemarlense has been reported on rocky substrata from the low intertidal to 8 m depth (CDRS record 2001, CDRS record 2002 , Taylor 1945). Frond growth varies seasonally.

Systems
  • Marine
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
DD
Data Deficient

Red List Criteria

Version
3.1

Year Assessed
2007

Assessor/s
Miller, K.A., Garske, L. & Edgar, G.

Reviewer/s
Stuart, S.N. & Carpenter, K.E. (Global Marine Species Assessment Coordinating Team)

Contributor/s

Justification
This species is sensitive to El Niño and has shown large population fluctuations. Records indicate that the species is widespread and relatively abundant in western regions; however, because of difficulties in identification, the magnitude of past declines and recovery cannot be adequate assessed; consequently, listed as Data Deficient.
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Population

Population
According to K.A. Miller (pers. comm.), S. albemarlense can be confused with other species (e.g., S. zacae, S. howellii); hence population size and distribution are uncertain. Taylor (1945) categorized this alga as rare at Bartolome, but Wellington (1975) reported it as one of the most abundant brown algal species at two of three sites (Punta Espinosa and Academy Bay). More recent studies indicated that its abundance ranged from abundant at Post Office Bay, Floreana (CDRS record in 2001) to common at Punta Espinosa, Fernandina (CDRS record in 2002). Populations around Academy Bay and the central archipelago are patchy and sparse at present (L. Garske, pers. comm.)

Population Trend
Unknown
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Threats

Major Threats
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.
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Management

Conservation Actions

Conservation Actions
S. albemarlense 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).
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