Overview

Distribution

Range Description

Rhodymenia decumbens is an endemic species to the Galápagos Islands, reported from: Baltra (Taylor 1945). Isla Rabida (dredge 55 to 63 m) (1972 UC, K.A. Miller pers. comm.). Fernandina: Punta Espinosa (2004 UC, K.A. Miller pers. comm.), and Islet south of Cabo Douglas (2004 UC, K.A. Miller pers. comm.). Isabela: Cabo Berkeley (2004 UC, K.A. Miller pers. comm.), and Elizabeth Bay, Isabela (2004 UC, K.A. Miller pers. comm.).
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Physical Description

Type Information

Type locality: I. Baltra, Gal‡pagos Islands, Ecuador
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Isotype for Rhodymenia decumbens W.R. Taylor
Catalog Number: US 56928
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): W. R. Taylor
Year Collected: 1934
Locality: Off the Island., Baltra [South Seymour], Galápagos Is., Colón, Ecuador, Archipiélago de Colón, South America
  • Isotype: Taylor, W. R. 1945. Allan Hancock Pacific Exped. 12: 251.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
R. decumbens has been reported from depths of 9 to 33 m on rocky substrata (Taylor 1945, K.A. Miller pers. comm.).

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
No information is available on population size or trends, and there is little information on area of occupancy. More data are needed to adequately assess threat status, hence is listed as Data Deficient.
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Population

Population
Unknown.

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
R. decumbens 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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