On the presence of fertile gametophytes of <i>Padina pavonica</i> (Dictyotales, Phaeophyceae) from the Iberian coasts

The gametophytes of <em>Padina pavonica</em> (L.) Thivy have received little attention in literature. Both female and predominantly male monoecious gametophytes of <em>P. pavonica</em> are recorded for the first time in the Iberian Peninsula. A detailed description of the morphology and the disposition of oogonia and antheridia is presented. In addition, a comparison with literature data on this and other <em>Padina</em> species is carried out.<br><br>Los gametófitos de <em>Padina pavonica</em> (L.) Thivy han sido escasamente reseñados en la bibliografía. En este trabajo se señala por primera vez en las costas de la Península Ibérica la presencia de gametófitos fértiles de <em>P. pavonica</em>, tanto femeninos como monoicos predominantemente masculinos. Se presenta una detallada descripción de la disposición y la morfología de los oogonios y anteridios. Asimismo, se realiza una comparación con los datos bibliográficos de esta especie y con los de otras especies de <em>Padina</em

Sobre la presencia de gametófitos fértiles de Padina pavonica (Dictyotales, Phaeophyceae) en las costas ibéricas

The gametophytes of Padina pavonica (L.) Thivy have received little attention in literature. Both female and predominantly male monoecious gametophytes of P. pavonica are recorded for the first time in the Iberian Peninsula. A detailed description of the morphology and the disposition of oogonia and antheridia is presented. In addition, a comparison with literature data on this and other Padina species is carried out.Los gametófitos de Padina pavonica (L.) Thivy han sido escasamente reseñados en la bibliografía. En este trabajo se señala por primera vez en las costas de la Península Ibérica la presencia de gametófitos fértiles de P. pavonica, tanto femeninos como monoicos predominantemente masculinos. Se presenta una detallada descripción de la disposición y la morfología de los oogonios y anteridios. Asimismo, se realiza una comparación con los datos bibliográficos de esta especie y con los de otras especies de Padin

Nuclear DNA content variation in life history phases of the Bonnemaisoniaceae (Rhodophyta)

Nuclear DNA content in gametophytes and sporophytes or the prostrate phases of the following species of Bonnemaisoniaceae (Asparagopsis armata, Asparagopsis taxiformis, Bonnemaisonia asparagoides, Bonnemaisonia clavata and Bonnemaisonia hamifera) were estimated by image analysis and static microspectrophotometry using the DNA-localizing fluorochrome DAPI (4′, 6-diamidino-2-phenylindole, dilactate) and the chicken erythrocytes standard. These estimates expand on the Kew database of DNA nuclear content. DNA content values for 1C nuclei in the gametophytes (spermatia and vegetative cells) range from 0.5 pg to 0.8 pg, and for 2C nuclei in the sporophytes or the prostrate phases range from 1.15-1.7 pg. Although only the 2C and 4C values were observed in the sporophyte or the prostrate phase, in the vegetative cells of the gametophyte the values oscillated from 1C to 4C, showing the possible start of endopolyploidy. The results confirm the alternation of nuclear phases in these Bonnemaisoniaceae species, in those that have tetrasporogenesis, as well as those that have somatic meiosis. The availability of a consensus phylogenetic tree for Bonnemaisoniaceae has opened the way to determine evolutionary trends in DNA contents. Both the estimated genome sizes and the published chromosome numbers for Bonnemaisoniaceae suggest a narrow range of values consistent with the conservation of an ancestral genome

Estimates of nuclear DNA content in 98 species of brown algae (Phaeophyta)

Despite the fact that brown algae are critical components of marine ecosystems around the world only one species has had its genome sequenced. To facilitate genome studies in the class we report data for 12 of the 19 recognized orders

&lt;I&gt;Dictyota ciliolata&lt;/I&gt; Sonder &lt;I&gt;ex&lt;/I&gt; Kützing (Phaeophyceae, Dictyotales) en Mer Méditerranée

Dictyota ciliolata est une espèce tropicale-subtropicale qui se trouve principalement sur les côtes des océans Atlantique et Indien. Bien que déjà signalée des zones proches de la Méditerranée, telles la Mer Rouge et les côtes Atlantiques du Maroc, des Canaries et de Madère, D. ciliolata n\u27avait pas été rapportée en Méditerranée ; elle est, ici, signalée sur les côtes de la Péninsule Ibérique. La morphologie et l\u27anatomie des individus de D. ciliolata de la Péninsule Ibérique sont comparées avec celles de spécimens d\u27autres zones géographiques, ainsi qu\u27avec d\u27autres espèces de Dictyota de la Méditerranée.The presence of Dictyota ciliolata (Dictyotales, Phaeophyceae) on the coasts of the Iberian Peninsula is reported. D. ciliolata is a tropical to subtropical species mainly distributed along the coasts of the Atlantic and Indian oceans. Although it occurs in areas next to the Mediterranean, like the Red Sea and the Atlantic coasts of Morocco, Canary Islands and Madeira, D. ciliolata had not been previously reported from the Mediterranean Sea. A morphological and anatomical comparison of the Iberian specimens of this species with those of other geographical areas, as well as with other similar species of Dictyota occurring in the Mediterranean Sea, is provided.</p