Juan L. Maté

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Bleaching and mortality of zooxanthellate corals during the 1997-98 El Nino-Southern Oscillation (ENSO) event are documented for eastern equatorial Pacific localities in Panama (Gulf of Chiriqui and Gulf of Panama) and Ecuador (Galapagos Islands and mainland coast). Overall, the very strong 1997-98 and 1982-83 ENSOs were similar in magnitude and duration,(More)
The massive coral species Porites lobata from upwelling and non-upwelling environments on the Pacific coast of Panama was exposed to experimentally elevated water temperature and ambient UV radiation to assess the response of the coral-zooxanthella symbiosis. Our experiment demonstrated that elevated water temperature in the range of 30 to 31∞C caused(More)
Coral bleaching events have increased in frequency and severity, due mainly to elevated water temperature associated with El Niño-related warming and a general global warming trend. We experimentally tested the effects of El Niño-like sea temperature conditions on five reef-building corals in the Gulf of Panama. Branching species (Pocillopora damicornis and(More)
The authors investigated the response to experimentally elevated water temperature in genotypes of Pocillopora damicornis from three coral reefs in the upwelling Gulf of Panama and four coral reefs in the non-upwelling Gulf of Chiriquí, Panamanian Pacific. Sea-surface temperature in the Gulf of Panama declines below 20 °C during seasonal upwelling, while in(More)
Species intolerant of changing climate might avoid extinction within refugia buffered from extreme conditions. Refugia have been observed in the fossil record but are not well documented or understood on ecological time scales. Using a 37-year record from the eastern Pacific across the two most severe El Niño events on record (1982-1983 and 1997 1998) we(More)
Two new steroids (1 and 2) and the known pregna-1,4,20-trien-3-one (3) have been isolated from the Pacific octocoral Carijoa multiflora. Compound 1 possesses a novel spiropregnane-based steroidal skeleton. The photochemical transformation of 3 into 1 allowed the assignment of the absolute configuration at C-10 of 1. The antibacterial activities of compounds(More)
Two unique chloro-pregnane steroids have been isolated from the eastern Pacific octocoral Carijoa multiflora and their structures and stereochemistries were determined on the basis of spectral studies and molecular mechanics calculations. © 2003 Elsevier Ltd. All rights reserved. Pregnane steroids and their glycosides are rare in the marine environment and,(More)
[structure: see text] Biogenetically interesting polypropionate-derived metabolites 1 and 2, featuring an unprecedented skeleton, have been isolated from the sea slug Elysia diomedea. Their enantiomeric character indicates that the current spontaneous electrocyclization cascade biogenetic hypothesis for the bicyclo[4.2.0]octane core must be enzymatically(More)
[structure: see text] An unprecedented biogenetically interesting bicyclic prostanoid 1, carijenone, has been isolated from the eastern Pacific octocoral Carijoa multiflora. The C-12 oxygenated function, characteristic of the coral cyclopentanone fatty acid derivatives, is involved in the formation of a five-membered oxane ring fused to the cyclopentane(More)
Side-chain-oxidized C-28-sterol 1 and one new pregnane metabolite 2 were isolated from eastern Pacific Muricea spp. The C-24(28)-epoxide functionality is a key intermediate in the C-24-dealkylation mechanism of the conversion of phytosterol to cholesterol by phytophagous insects. Certain marine invertebrates share this dealkylation pathway; however, such a(More)