New records of brown algae (Phaeophyta) from the Azores

Copyright © 2000 Kluwer Academic Publishers. Printed in the Netherlands.The following five species of microscopic tuft-forming/encrusting brown algae (Phaeophyta) are newly recorded for the Island of São Miguel (Azores): Nemoderma tingitana Schousboe ex Bornet. Pseudolithoderma roscoffense Loiseaux (Lithodermataceae), Hecatonema terminalis (Kutzing) Kylin (Punctariaceae), Compsonema saxicolum (Kuckuck) Kuckuck, and Microspongium gelatinosum Reinke (Scytosiphonaceae). The species are described, and information is presented on their ecology and distribution around the island

Porphyrostromium Trevisan (1848) Vs. Erythrotrichopeltis Kornmann (1984) (Rhodophyta)

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/149702/1/tax02529.pd

Nomenclatural Assessment Of Goniotrichum Kützing, Erythrotrichia Areschoug, Diconia Harvey, And Stylonema Reinsch (Rhodophyta)

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/149711/1/tax03682.pd

Petite contribution à une monographie bionomique de la Ría de Vigo

56 page

Deep reefs are climatic refugia for genetic diversity of marine forests

AimPast climate-driven range shifts shaped intraspecific diversities of species world-wide. Earlier studies, focused on glacial refugia, might have overlooked genetic erosion at lower latitudes associated with warmer periods. For marine species able to colonize deeper waters, depth shifts might be important for local persistence, preventing some latitudinal shifts, analogous to elevational refugia in terrestrial habitats. In this study, we asked whether past latitudinal or depth range shifts explain extant gene pools in Saccorhiza polyschides, a large habitat structuring brown alga distributed from coastal to offshore deep reefs.LocationNorth-east Atlantic and western Mediterranean basin.MethodsGenetic structure and diversity were inferred using seven microsatellite loci, for 27 sites throughout the entire distributional range. Ecological niche modelling (ENM) was performed with and without information about genetic structure (sub-taxon niche structure) to predict distributions for the Last Glacial Maximum (LGM), the warmer Mid-Holocene (MH) and the present.ResultsBoth ENM approaches predicted a wider potential distribution in deeper waters than is presently known, a post-glacial expansion to northern shores and the extirpation of southern edges during the warmer MH. Genetic data corroborated range dynamics, revealing three major genetic groups with current boundaries in the Bay of Biscay and the Lisbon coastal region, pinpointing ancient refugial origins. Despite extensive southern range contraction, the southernmost warmer regions are still the richest in genetic diversity, indicating long-term persistence of large populations. ENMs suggested that this could only have been possible due to stable refugia in deeper reefs.Main conclusionsThe global distribution of gene pools of temperate marine forests is explained by past range shifts that structured both latitudinal glacial refugia and depth refugia during warmer periods. Deep rear edge populations play a fundamental role during periods of extreme climate, allowing persistence and retaining some of the largest genetic diversity pools of the species' distribution