• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1
  • 1
  • Tagged with
  • 2
  • 2
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Systematics of the non-geniculate coralline red algae from the South African south coast

Van der Merwe, Elizabeth January 2015 (has links)
Philosophiae Doctor - PhD / The aim of this study was to document the intertidal and shallow subtidal species of non-geniculate coralline red algae from the South Africa south coast. The main emphasis of the study are encompassed in four research chapters and one concluding chapter focusing on: 1) the documentation of the non-geniculate coralline red algae occurring along the South Africa south coast; 2) revisiting the Leptophytum-Phymatolithon complex in order to resolve the taxonomic status of species previously ascribed to the genus Leptophytum from South African; 3) starting to prepare modern monographic accounts of the higher taxa; and 4) the production of updated keys to all the currently recognised taxa of non-geniculate coralline algae for South Africa. Although nowhere near complete, here we present our findings and report on the current biodiversity status of the non-geniculate coralline red algae after a further four years of extensive sampling.
2

Composição e estrutura das comunidades de macroalgas do infralitoral do Arquipélago de Fernando de Noronha, Pernambuco - Brasil, com ênfase nas calcárias incrustantes

BURGOS, Douglas Correia 28 February 2011 (has links)
Submitted by (edna.saturno@ufrpe.br) on 2016-06-16T14:44:46Z No. of bitstreams: 1 Douglas Correia Burgos.pdf: 3436566 bytes, checksum: 48a4c38e5d1f67031df4411355e813c0 (MD5) / Made available in DSpace on 2016-06-16T14:44:46Z (GMT). No. of bitstreams: 1 Douglas Correia Burgos.pdf: 3436566 bytes, checksum: 48a4c38e5d1f67031df4411355e813c0 (MD5) Previous issue date: 2011-02-28 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / A good interpretation about the components and the origin of the Brazilian flora requires fundamentally that this knowledge is also based on the survey of algae from oceanic islands and subtidal zone. The little information about the flora from oceanic islands is an issue of concern considering the fragility of algal communities on these ecosystems due to their limited area and distance from the continent. Another aspect still to be understood about the subtidal zone is related to the qualitative analyses of the incrusting coralline algae. Two expeditions were made and 19 sampling sites on the subtidal zone were selected based on the diving maps of the archipelago, among which 13 sites on the protected side and 6 sites on the exposed side. At each site, sampling was performed at different isobaths (0 to 28 meters). The first manuscript describes the survey on the incrusting coralline algae diversity that colonises the subtidal region of the Fernando de Noronha Archipelago, presenting descriptions of three species: Sporolithon episporum (M. Howe) E.Y. Dawson (Sporolithaceae), Mesophyllum erubescens (Foslie) Me Lemoine (Hapalidiaceae) and Lithophyllum stictaeforme (Areschoung in J. Agardh) Hauck (Corallinaceae). The second presents an evaluation of the structure and composition of the subtidal communities, where 48 species are registered, including ten new additions for the Brasilian oceanic islands. Phaeophyceae presented the highest visual cover while Rhodophyta presented the smallest, 44% and 0.4% respectively. The studied area may be altered due to natural disturbance, probably caused by herbivory. / Para uma melhor interpretação sobre os componentes e a origem da flora brasileira, é de fundamental importância que este conhecimento esteja baseado, também, no inventário das algas das ilhas oceânicas e da região de infralitoral. A pouca informação sobre a flora das ilhas oceânicas brasileiras é um fato preocupante tendo em vista a fragilidade das comunidades algais nesses ecossistemas, devido à área restrita desses ambientes e a distância entre a ilha e o continente. Outro aspecto a ser conhecido em relação ao infralitoral diz respeito à análise qualitativa das algas calcárias incrustantes. Foram realizadas duas excursões para coleta de material e delimitados 19 pontos de coletas no infralitoral, com base nos mapas de mergulho do arquipélago, dos quais 13 pontos no mar de dentro e 6 pontos no mar de fora. Para cada ponto foram realizadas coletas em diferentes isóbatas (0 a 28 metros). O primeiro manuscrito trata do levantamento da diversidade das algas calcárias não articuladas que colonizam o infralitoral do Arquipélago de Fernando de Noronha onde são apresentadas descrições de três espécies: Sporolithon episporum (M. Howe) E.Y. Dawson (Sporolithaceae), Mesophyllum erubescens (Foslie) Me Lemoine (Hapalidiaceae) e Lithophyllum stictaeforme (Areschoung in J. Agardh) Hauck (Corallinaceae). O segundo manuscrito apresenta uma avaliação da estrutura e composição das comunidades do infralitoral, onde são registradas 48 espécies, sendo dez novas adições para as ilhas oceânicas brasileira. A categoria Phaeophyceae teve a maior cobertura visual e as Rhodophyta a menor com 44% e 0,4% respectivamente. A área estudada pode estar alterada devido a distúrbios naturais apresentados provavelmente pela herbivoria.

Page generated in 0.0587 seconds