Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Porifera"”.
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Molecular Evolution in non-bilaterian Metazoa with Emphasis on Phylum Porifera
… der basalen Stämme innerhalb der Metazoa (Porifera, Placozoa, Cnidaria and Ctenophora) sind noch immer nicht abschliessend geklärt und Gegenstand wissenschaftlicher Diskussionen. Ein Grund für unser fehlendes Verständnis ist die einfache Organisation dieser Tiere, die nur wenige informative …
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Taxonomia da subclasse Tetractinomorpha (Porifera, Demospongiae) do Arquipélago de Abrolhos, BA, Brasil
ln the present study are described and illustrated the sponges of the Subclass Tetractinomorpha from Abrolhos Archipelago, which integrates the largest and most complex reefal region of the South Atlantic. A key to the identification of the Tetractinomorph species from archipelago is also given. …
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Biological structure of an Agulhas Bank subtidal reef community and consumption estimation for a dominant species
… environment. In particular, the contribution of Porifera to the organic matter pool in terms of biomass and the consumption of organic matter by a dominant Porifera species are assessed. Further, reef fauna biomass and community structure, as well as Porifera respiration, the subsurface …
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Reproductive traits of pioneer gastropod species colonizing deep-sea hydrothermal vents after an eruption
… of two pioneer gastropod species, Ctenopelta porifera and Lepetodrilus tevnianus, presented itself in 2006 after an eruption on the East Pacific Rise (EPR) eliminated vent communities near 9°50ʹ′N. Standard histological techniques were used to determine whether reproductive characteristics, …
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The biogeography and trophic roles of coastal marine sponges (Porifera) from the west coast of the North Island, New Zealand: Influences of catchments.
Anthropogenic activities are degrading coastal marine ecosystems globally. While the ecological and biodiversity implications of some of these impacts are well understood, for others there is a need for a greater understanding of the effects of these activities on vulnerable sedentary species. For …
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Poríferos da Baía de Sepetiba (Rio de Janeiro-Brasil)
Presents the distribution of Porifera in the Baía de Sepetiba, based upon the material collected by himself from 1975 to 1979. Besides the identification of the families, genera and species, the author presents some data about the distribution of these species in Brazil, according to records of …
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Reproductive traits of pioneer gastropod species colonizing deep-see hydrothermal vents after an eruption
… reproducers with high fecundity. In C. porifera, the oocyte size distributions differed slightly between two collection dates, suggesting that environmental cues may introduce some variability in gamete release. In samples collected within one year of the estimated eruption date, …
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ΣΥΣΤΗΜΑΤΙΚΗ ΖΩΟΓΕΩΓΡΑΦΙΚΗ ΚΑΙ ΟΙΚΟΛΟΓΙΚΗ ΜΕΛΕΤΗ ΤΩΝ ΔΗΜΟΣΠΟΓΓΩΝ ΤΗΣ ΗΠΕΙΡΩΤΙΚΗΣ ΥΦΑΛΟΚΡΗΠΙΔΑΣ ΤΟΥ ΒΟΡΕΙΟΥ ΑΙΓΑΙΟΥ
117 SPECIES OF DEMOSPONGIAE (PORIFERA) WERE COLLECTED FROM 144 SAMPLING STATIONS, IN THE NORTH AEGEAN SEA. THREE OF THESE SPECIES, BUBARIS YIOURI, ENDECTYONAEGAENSIS AND SPONGIA SPORADHI ARE NEW FOR THE SCIENCE. 61 OF THEM ARE NEW FOR THE FAUNA OF THE EASTERN MEDITERRANEAN AND 80 ARE NEW FOR THE …
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Entdeckung des neuen Candidatus Phylums Poribacteria
Marine Schwämme (Porifera) sind sessile Invertebraten, deren Biomasse bis zu 60% von assoziierten Mikroorganismen gebildet werden kann. Dieses mikrobielle Konsortium ist phylogenetisch komplex, die monophyletischen Abstammungslinien sind hochgradig wirtsspezifisch und bisher konnte kein Vertreter …
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Gene Expression in the Choanoderm
<p>The body plan of sponges (phylum Porifera) is an outlier among modern animals and is thought to have special evolutionary significance. Sponges lack muscles, nerves and a gut. Instead, they are composed of few cell types and simple tissues that function to pump water through an internal canal …
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Taxonomia de porífera do Arquipélago de São Pedro e São Paulo, Brasil
… they represent 10 orders of two classes of Porifera (Calcarea and Demospongiae ). Five new species and 20 new records for the archipelago are described. The genus Discodermia, known to produce compounds with high pharmacological potential is recorded for the first time from Brazil. A key to …
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Taxonomia de Asterocheridae (Copepoda: Siphonostomatoida) associado a esponjas do litoral brasileiro
… the Asterocheridae species associated with Porifera were analyzed. Nine new species are described, six of them belonging to the genus Asterocheres (A. abrolhensis n. sp., A. crenulatus n. sp., A. lunatus n. sp., A. paraboecki n. sp., A. spinopaulus n. sp. and A. tetrasetosus n. sp.), one to …
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Faunal biogeography, community structure, and genetic connectivity of North Atlantic seamounts
… distinct faunal assemblages, dominated by the Porifera, Cnidaria, and Echinodermata and structured by geographic region, depth regions (with apparent taxonomic breaks at 1300 m, 2300 m, and 2600 m), and substrate type (including natural/anthropogenic and abiotic substrates and biotic …
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Palaeoecology and taxonomy of the macrobenthic fauna from the Upper Cretaceous Ajlun Group, southern Jordan
… gastropods, 9 echinoids, and 4 corals. The phyla Porifera, Bryozoa, and Brachiopoda are represented by 1 species each. Additionally, at least two species of decapod crustaceans were found. One bivalve species is new: Anthonya jordanica from Cenomanian claystones of the eastern study area. 41 …
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BENTHIC HABITAT MAPPING OF MOUNTAIN TOP BANK WITHIN THE NORTHERN GULF OF MEXICO THROUGH INTEGRATED GEOPHYSICAL AND VISUAL DATA ANALYSIS
… a diverse array of biota including Cnidaria, Porifera, Mollusca, Chordata, Echinodermata, and Rhodophyta. Compiling these data into a BHM and geographic information system (GIS) geodatabase is a powerful way to assess ecosystems and support conservation efforts.</p>
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Faunal biogeography, community structure, and genetic connectivity of North Atlantic seamounts
… distinct faunal assemblages, dominated by the Porifera, Cnidaria, and Echinodermata and structured by geographic region, depth regions (with apparent taxonomic breaks at 1300 m, 2300 m, and 2600 m), and substrate type (including natural/anthropogenic and abiotic substrates and biotic …
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Spatial distribution and diversity of soft-bottom benthic invertebrates from demersal trawl surveys off the coast of Namibia
… (28 species), Cnidaria (23 species), Porifera (5 species), Annelida (4 species), Chordata (2 species), Sipuncula (1 species) and Bryozoa (1 species). The diversity of benthic invertebrate taxa along Namibia's coast was found to increase in a south-to-north direction. High abundances of …
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Studies on the diversity and spatial distribution of deep-water sponges along the west and south coasts of South Africa
… and community structure for the sponges (Porifera) along the west and south coasts of South Africa. Species collected were identified to the lowest level of lowest taxonomic unit possible (either species or genus). The study site was divided into areas and in each of these we documented …
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Bath sponge aquaculture: aspects of culture and quality
… et al (1987) and Coscinoderma n. sp. [Phylum Porifera: Order Dictyoceratida Minchin (1900): Family Spongiidae Gray (1867)], cultured at the Palm Islands, central Great Barrier Reef. Sponge survival was dependent on species, culture method, and time with the highest mortality occurring soon …
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