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Registros recuperados: 20
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A reassessment of the phytogeographic characterization of Temperate Pacific South America RChHN
SANTELICES,BERNABE; MENESES,ISABEL.
In 1980, a study of geographic distribution patterns and geographic affinities of benthic algae of temperate Pacific South America (5-55 ºS) provided a first characterization of these coasts. High endemism and limited floristic exchange with the Tropical Pacific and with islands in the South Pacific at various distances from the continent were two outstanding features of the marine flora. A partial blockage of species exchange partially accounted for a peculiar latitudinal pattern of species richness that increases with increasing latitudes. In contrast, there was reduced species richness in comparison with other climatically equivalent regions that have contact with more effective routes of migration. Over the last two decades, more than 30 taxonomic and...
Tipo: Journal article Palavras-chave: Benthic phytogeography; Isolation; Latitudinal patterns; Seaweeds; Temperate South America.
Ano: 2000 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400005
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A taxonomic, phylogenetic and biogeographic study of the genus Acanthophora (Rhodomelaceae, Rhodophyta) Naturalis
Jong, Yde S.D.M. de; Hitipeuw, Creusa; Prud’homme van Reine, Willem F..
A cladistic analysis, based on a taxonomic revision is carried out for 7 Acanthophora species using 19 characters. Hypotheses on species affinities are based primarily on morphological characters. Because most species show only few distinctive characters, emphasis was placed on features of spine development, either in relation to vegetative or to reproductive structures. Global distribution of 7 Acanthophora species: viz. A. aokii, A. dendroides, A. muscoides, A. nayadiformis, A. pacifica, A. ramulosa, and A. spicifera, shows a discontinuous pattern. Although widely distributed species are present (A. muscoides and A. spicifera), a disjunct distribution of other species occurs in the Pacific (A. aokii), Indian Ocean (A. dendroides), East-Atlantic region...
Tipo: Article / Letter to the editor Palavras-chave: Rhodomelaceae; Rhodophyta; Biogeography; Phylogenetics; Seaweeds; Taxonomy.
Ano: 1999 URL: http://www.repository.naturalis.nl/record/525490
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Cultivo piloto de macroalgas rojas (Rhodophyta) en Bahía Portete, La Guajira, Colombia OceanDocs
Delgadillo-Garzón, O.; Newmark, F..
Se realizó un cultivo piloto de macroalgas en bahía Portete, La Guajira, Colombia, entre julio de 2005 y junio de 2006, con el fin de evaluar la factibilidad de implementarlo como alternativa productiva para las comunidades costeras de la región. Se sembraron 114 kg de las algas rojas Gracilaria cervicornis, Hydropuntia cornea, Hypnea musciformis y Grateloupia sp. sobre cuerdas de polipropileno y mallas cilíndricas en dos lugares de la bahía. La especie G. cervicornis tuvo tasas de crecimiento relativo (TCR) entre 0.1 % día-1 y 1.22 % día-1, con promedio de 0.44 % día-1, fuerte epifitismo y altas tasas de pérdida. La especie H. cornea presentó un promedio de TCR de 0.91 % día-1 y osciló entre 0.02 % día-1 y 3.5 % día-1 en el sitio uno, mientras que en el...
Tipo: Journal Contribution Palavras-chave: Seaweeds; Seaweed culture; Seaweed culture; Seaweeds; Http://aims.fao.org/aos/agrovoc/c_6914; Http://aims.fao.org/aos/agrovoc/c_14154.
Ano: 2008 URL: http://hdl.handle.net/1834/3485
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Estimation du stock naturel de l’algue brune <Padina pavonica> (l.) thivy en Tunisie septentrionale OceanDocs
Ksouri, J.; Elferjani, H.; Mensi, F..
L’identification d’un principe actif servant en thérapie osseuse a propulsé l’algue brune Padina pavonica au rang des algues à intérêt économique très prisées à l’échelle mondiale et en Tunisie. L’évaluation des potentialités de cette espèce au niveau d’un site atelier, Cap Zebib (Nord-Est de la Tunisie), a été initiée pour éclairer les décideurs sur l’état du stock, afin que l’autorisation pour la collecte d’un certain tonnage de cette algue soit accordée en connaissance de cause. A Cap Zebib, l’espèce en question étant localisée dans la zone comprise entre 0 et 10 m, la biomasse naturelle disponible est évaluée à 112,5 tonnes de matière fraîche, soit 25 tonnes de matière sèche (22,2%). Le rendement global est de 0,850 t/ha. Mais, comme la majeure partie...
Tipo: Journal Contribution Palavras-chave: Biomass; Commercial species; Seaweed products; Seaweeds; Stock assessment.
Ano: 2008 URL: http://hdl.handle.net/1834/4251
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Etude saisonnière de la contamination métallique des macroalgues de la lagune nord de Tunis OceanDocs
Chouba, L.; Ajjabi-Chebil, L.; Herry, S..
Dans le but de démontrer la capacité de bioaccumulation métallique des macroalgues et sa variation temporelle, on s’est intéressé à la détermination de la gamme de concentrations en métaux traces (Plomb, Cadmium, Fer, Manganèse et Zinc) dans trois macroalgues vertes (Ulva rigida, Chaetomorpha linum, Caulerpa prolifera) au niveau de la lagune nord et du canal de navigation de Tunis sujettes à d’importants rejets anthropiques. Des collectes saisonnières ont été faites dans la lagune de Tunis durant la période d’avril 2009 au février 2010. Les teneurs métalliques déterminées par spectrophotométrie d’absorption atomique ont montré des variations significatives selon l’espèce et la saison de prélèvement. Les résultats ont montré que les teneurs en différents...
Tipo: Journal Contribution Palavras-chave: Heavy metals; Algae; Seaweeds; Bioaccumulation; Green algae.
Ano: 2010 URL: http://hdl.handle.net/1834/4733
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La rhodophycée Gelidium spinosum (s.g. Gmelin) p.c. Silva, des cotes de Monastir : lumière sur quelques aspects hydro-biologiques OceanDocs
Romdhane, M.S.; Ben Said, R.; El Abed, A.; M'Rabet, R..
في هذه الدراسة تمت متابعة الطحلب الأحمر Gelidium spinosum على سواحل المنستير منذ سبتمبر 2000 إلى أوت 2001 و أبرزت النتائج المتحّصل عليها أن الوزن الأقصى تم تسجيله في ماي وهو حوالي 37غ أما الطول الأقصى (11 صم) فقد تم الحصول عليه في شهر جوان . و أما الكتلة الحيوية الأعلى فقد تم التحصل عليها في شهر ماي (حوالي 7 كغ/م2) . أما نسبة الخصوبة فتراوحت بين 0 و 100% . كل هذه النتائج بينت لنا أن الطحلب Gelidium spinosum هو نبتة معمرة لكن حضورها متميز أكثر في الربيع والصيف .
Tipo: Journal Contribution Palavras-chave: Gelidiales Gelidium spinosum Rhodophyta; Biomass; Fertility; Length; Seaweeds; Weight; Biomass; Length; Fertility; Seaweeds; Weight; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_4260; Http://aims.fao.org/aos/agrovoc/c_2862; Http://aims.fao.org/aos/agrovoc/c_14154; Http://aims.fao.org/aos/agrovoc/c_8349.
Ano: 2007 URL: http://hdl.handle.net/1834/4285
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Les consequences de l'echouement de l'Amoco Cadiz" sur les peuplements algaux exploitables ArchiMer
Kaas, Raymond.
Introduction. The amount of hydrocarbons dumped into the sea is currently estimated at 6 to 16 million tons per year. This pollution comes from various sources: Chronic discharges associated with human activity such as oil tanker deballasting or discharges from coastal petroleum processing facilities; natural chronic discharges; accidental discharges like leaks coming from drilling well heads or oil tanker accidents. Natural spills happen, in general, in a relatively unobtrusive way and their effects are quickly diminished by significant dilution and rapid degradation of the various components. Oil spills, however, are characterised by a massive and occasional supply of hydrocarbons. The "Amoco Cadiz" shipwreck fits in with this last case and has seemed...
Tipo: Text Palavras-chave: Seaweeds; Pollution Effects; Marine Pollution; Oil Spill.
Ano: 1980 URL: http://archimer.ifremer.fr/doc/1980/publication-1950.pdf
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Macroalgas de la plataforma insular cubana como fuente de extractos bioactivos. OceanDocs
Valdés-Iglesias, O.; Díaz, N.; Cabranes, Y.; Acevedo, M.E.; Areces, A.J.; Graña, L.; Díaz, C..
Cuarenta y cinco especies de algas marinas cubanas colectadas en 2 macrozonas en las costas norte y sur del archipiélago cubano, fueron evaluadas a partir de la preparación de 63 extractos con relación a su toxicidad frente al ensayo alternativo con nauplios de Artemia salina (Mitchael et al, 1956) y la prueba de intercalante de ADN (Miravet et al, 1989). Del total de extractos resultaron muy tóxicos el 33.8 % y moderadamente tóxicos el 52,3 %. El resto resultó no tóxico. De ellos respondieron positivamente a la prueba de intercalantes del ADN, sólo 11 extractos, fundamentalmente los extractos etanólicos, posibles candidatos para ser evaluados como antitumorales. La composición química de los extractos crudos fue analizada con referencia al contenido de...
Tipo: Journal Contribution Palavras-chave: Seaweeds; Seaweeds; Http://aims.fao.org/aos/agrovoc/c_14154.
Ano: 2003 URL: http://hdl.handle.net/1834/2918
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Mise en place d'une base de données informatisée sur les macroalgues de Tunisie OceanDocs
Langar, H.; Ktari, L..
TunAlgoBase is a computerized database aiming to list tunisian macroalgae and store at the same place different species information such as taxonomy, biology, ecology, geographical distribution and potential use. Geographical distribution data are most complet for the 414 species in the database. The other headings such as taxonomy, biology, ecology,... are in continual enhancement and completed for some species.
Tipo: Journal Contribution Palavras-chave: Biodiversity; Data collections; Seaweeds; Check lists; Biological data; Geographical distribution; Algae; Geographical distribution; Biodiversity; Seaweeds; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_33949; Http://aims.fao.org/aos/agrovoc/c_14154.
Ano: 2004 URL: http://hdl.handle.net/1834/1170
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Notas sobre las species del orden Gigartinales (Rhodophyceae) en la Costa Atlántica de Colombia. OceanDocs
Schnetter, R.; Schnetter, M.L..
Se informa sobre la presencia de unas especies de los géneros Agardhiella, Gigartina, Gracilaria, Gymnogongrus y Hypnea en las regiones de Santa Marta, Puerto Colombia y Cartagena. (Costa Atlántica de Colombia). Algunas de las especies mencionadas (Gigartina acicularis [Wulfen] Lamouroux, Gracilaria sjoestedtii Kylin, Gymnogongrus tenuis [J. Agardh] J. Agardh) no eran conocidas en la literatura como crecientes en la región examinada.
Tipo: Journal Contribution Palavras-chave: Seaweeds; Seaweeds; Http://aims.fao.org/aos/agrovoc/c_14154.
Ano: 1967 URL: http://hdl.handle.net/1834/3278
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Organic micropollutants (PAHs, PCBs, pesticides) in seaweeds of the lagoon of Venice ArchiMer
Pavoni, B; Caliceti, M; Sperni, L; Sfriso, A.
Samples of seven genera of seaweeds (Ulva, Gracilaria, Porphyra, Grateloupia, Undaria, Fucus and Cystoseira), which can be used as environmental biomonitors and in several applications like human alimentation, animal feeding and cosmetics, were collected in four sampling sites in the Lagoon of Venice in spring and autumn 1999 with the aim of determining the contamination due to organic micropollutants (polychlorinated biphenyls. PCBs; chlorinated pesticides; polycyclic aromatic hydrocarbons, PAHs). On an average, most of the considered species were contaminated especially by PAHs (up to 56 ng g(-1) dry wt. (dw)) whereas concentrations of PCBs and pesticides in macroalgal tissues were significantly correlated and did not exceed 5 ng g-1 dw. Among the...
Tipo: Text Palavras-chave: Macro-algues; Lagune de Venise; HAP; PCB; Pesticides; Seaweeds; Venice Lagoon; PAHs; PCBs; Pesticides.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00321/43250/42981.pdf
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Posidonia Oceanica meadows along the eastern coast of Tunisia: feature and health status OceanDocs
Sghaier, Y.R.; Zakhama-Sraieb, R.; Charfi Cheikhrouha, F..
La structure, la phénologie et la croissance des faisceaux des herbiers à Posidonia oceanica ont été étudiées dans quatre sites au niveau du centre Est de la Tunisie (Hergla, El Kantaoui, Monastir et Mahdia). La densité des faisceaux, le recouvrement et les paramètres phénologiques présentent une différence significative entre les sites et les profondeurs en relation avec l’intensité des activités humaines. Les herbiers les plus denses (441 à 984 faisceaux m-²) et les indices foliaires les plus élevés (8,5 à 13m2 m-²)) ont été enregistrés à Mahdia. Le nombre moyen des feuilles produites annuellement ne montre pas de différence significative entre les sites et les profondeurs étudiées. La croissance du rhizome de Posidonia oceanica est considérablement plus...
Tipo: Journal Contribution Palavras-chave: Seagrass; Seaweeds.
Ano: 2011 URL: http://hdl.handle.net/1834/4738
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Première signalisation de "Caulerpa taxifolia" (vahl) j . Agardh en Tunisie OceanDocs
Langar, H.; Djellouli, A.; Ben Mustapha, K.; El Abed, A..
Depuis sa parution en Méditerranée nord occidentale en 1984, l’algue verte d’origine tropicale Caulerpa taxifolia n’a pas cessé de progresser le long du littoral septentrional de la Méditerranée. Le présent travail signale pour la première fois la présence de cette algue sur le littoral oriental de la Méditerranée et plus précisément dans la rade de Sousse (Tunisie), en face du port, par 17 mètres de profondeur. L’arrivée de Caulerpa taxifolia à Sousse, n’est certainement pas le résultat d’une progression naturelle à partir d’anciennes station, l’hypothèse la plus probable expliquant son existence dans la rade serait son introduction liée à un transport de boutures par des embarcations ayant auparavant jeté l’encre dans des zones déjà envahies par l’espèce.
Tipo: Journal Contribution Palavras-chave: New records; Algae; Geographical distribution; Seaweeds; Caulerpa taxifolia; Http://aims.fao.org/aos/agrovoc/c_49499.
Ano: 2000 URL: http://hdl.handle.net/1834/4289
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Screening de l’activité anti-microfouling d’algues vertes récoltées sur la côte nord Tunisienne OceanDocs
Chérif, W.; El Bour, M.; Daly Yahia-Kefi, O..
Les bio-salissures marines intéressent toute structure immergée en mer. Les dommages engendrés par ce phénomène sont économiquement importants. Les peintures utilisées pour prévenir du biofouling, utilisent des biocides organostaniques qui se sont avérés très toxiques et posent un problème environnemental important. Le présent travail s'intègre dans le cadre de la valorisation des macroalgues des côtes tunisiennes par la recherche de molécules naturelles antifouling pouvant se substituer aux substances déjà utilisées. Dans cette étude, nous avons analysé le potentiel anti-microfouling d’extraits organiques de 10 espèces d’algues vertes: Ulva linza, Ulva rigida, Chaetomorpha linum, Cladophora laetivirens, Codium bursa, Codium fragile, Caulerpa prolifera,...
Tipo: Journal Contribution Palavras-chave: Algae; Seaweeds; Green algae; Bacteria.
Ano: 2011 URL: http://hdl.handle.net/1834/4741
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Seaweed diversity patterns in Sub-Saharan Africa OceanDocs
De Clerck, O.; Bolton, J.J.; John, D.M..
A proper understanding of inshore marine ecosystems cannot be obtained without a thorough knowledge of marine vegetation. This paper summarises our knowledge of species diversity patterns of marine macroalgae in Sub-Saharan Africa, highlighting gaps. In Tropical East Africa the seaweed floras of Somalia and Mozambique are not well known. In Tropical West Africa, only a small number of countries are well-collected, although recent advances, including web-based systems, are ensuring that the information which is available can be more easily accessed. South Africa and Namibia have quite well documented seaweed floras, although detailed collections, especially in the subtidal, or detailed studies of taxa, particularly using molecular methods, anywhere in the...
Tipo: Proceedings Paper Palavras-chave: Seaweeds.
Ano: 2003 URL: http://hdl.handle.net/1834/973
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Seaweeds of the Snellius-II expedition: Chlorophyta: Caulerpales (except <i>Caulerpa</i> and <i>Halimeda</i>) OMA
Coppejans, E.; Prud'homme van Reine, W.F..
In the present paper a survey is given of species belonging to the genera <i>Avrainvillea, Chlorodesmis, Rhipilia, Rhipiliopsis, Tydemania</i> and <i>Udotea</i> collected during the Indonesian-Dutch Snellius-II Expedition (1984) in the Banda, Sawu and Flores Seas. The morphology and anatomy of these seaweeds are discussed, biogeographical data are added and some comparison is made with the material from the earlier Siboga Expedition (1899-1900).
Tipo: Info:eu-repo/semantics/article Palavras-chave: Expedition reports; Seaweeds; Caulerpales.
Ano: 1989 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3163
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Seaweeds of the Snellius-II expedition: Chlorophyta: Dasycladales OMA
Coppejans, E.; Prud'homme van Reine, W.F..
A survey is given of algae collected during the Snellius-II Expedition (1984) in the Banda, Sawu and Flores Seas, in particular the genera <i>Acetabularia, Bornetella, Cymopolia, Neomeris</i> and <i>Polyphysa</i> (Dasycladales). Their morphology and anatomy are discussed, biogeographical data are added and a comparison is made with the material from the earlier Siboga Expedition (1899-1900).
Tipo: Info:eu-repo/semantics/article Palavras-chave: Expedition reports; Seaweeds; Chlorophyta [green algae]; Dasycladales.
Ano: 1989 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3166
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Seaweeds of the Spermonde Archipelago, SW Sulawesi, Indonesia Naturalis
Verheij, E.; Prud’homme van Reine, W.F..
Seaweeds are important components of tropical reef systems. The present paper deals with the Chlorophyta, Phaeophyta and noncoralline Rhodophyta collected by the first author in the Spermonde Archipelago, SW Sulawesi, Indonesia, during the Buginesia-III project (November 1988-November 1990). Additional collections from this area by Keblusek (July 1991-October 1991) were also studied and the results are incorporated in the present paper. The results of the present study are compared with those of the Siboga Expedition (1899-1900), of the Danish Expedition to the Kei Islands (1914-1916), and of the Snellius-II Expedition (1985). In total, 199 taxa (80 Chlorophyta belonging to 21 genera, 36 taxa of Phaeophyta belonging to 11 genera, 83 noncoralline Rhodophyta...
Tipo: Article / Letter to the editor Palavras-chave: Indonesia; Seaweeds; Keys; Biotic reefs.
Ano: 1993 URL: http://www.repository.naturalis.nl/record/525170
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Stress tolerance of Antarctic macroalgae in the early life stages RChHN
Navarro,Nelso P.; Huovinen,Pirjo; Gomez,Ivan.
BACKGROUND: Early life stages of macroalgae, especially from polar species, can be highly vulnerable to physical stressors, leading to important consequences for the fate of the whole population in scenarios of changing environmental variability. In the present study, tolerance to UV and temperature stress, as measured by rapid adjustment of photochemistry, Fv/Fm, and photosynthetic characteristics based on P-E curves (ETRmax, &#945; and Ek), was assessed in the early life stages of six Antarctic macroalgal species from eulittoral (Pyropia endiviifolia, Iridaea cordata, Adenocystis utricularis and Monostroma hariotii) and sublittoral (Ascoseira mirabilis and Gigartina skottsbergii. RESULTS: Reproductive cells of eulittoral species showed the highest...
Tipo: Journal article Palavras-chave: Antarctica; Reproductive cells; Seaweeds; Temperature; UV tolerance.
Ano: 2016 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100005
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Temperatur-Toleranz tropischer Meeresalgen und mariner Phanerogamen OceanDocs
Hammer, L..
Se estudió la influencia de temperaturas elevadas y disminuidas, en algunas especies de algas y dos especies de fanerógamas marinas tropicales, de la costa colombiana. Como control de tolerancia se midieron fotosíntesis y respiración a temperatura ambiente (25°C), luego de haber sometido el material vegetal durante 12 horas a la temperatura cambiada. Para todas las algas investigadas se encontró el límite de resistencia de temperaturas entre 34° y 36°C. Ninguna de las algas toleró la temperatura de 38°C. El límite de la tolerancia de temperaturas para las fanerógamas Thalassia testudinum y halophila decipiens está entre 32,5 y 34°C. En general, el aparato fotosintético resultó menos resistente al elevar la temperatura que el sistema respiratorio. La...
Tipo: Journal Contribution Palavras-chave: Temperature; Seaweeds; Temperature; Seaweeds; Http://aims.fao.org/aos/agrovoc/c_7657; Http://aims.fao.org/aos/agrovoc/c_14154.
Ano: 1972 URL: http://hdl.handle.net/1834/3288
Registros recuperados: 20
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