Thesis (M.Sc.)--Acadia University, 1999. / Includes bibliographical references (leaves 54-57). Also available on the Internet via the World Wide Web.

Thesis (M.Sc.)--Acadia University, 1999. / Includes bibliographical references (leaves 54-57). Also available on the Internet via the World Wide Web.

No description available.

There are no published accounts of larval development for P. giardi, although Mesnil (1896) determined his populations to be simultaneous hermaphrodites. The present paper describes aspects of the reproductive biology and larval development of P. girardi and presents descriptions and illustrations of developing larvae and recently metamorphosed juveniles.

Made available in DSpace on 2014-06-12T15:03:46Z (GMT). No. of bitstreams: 2 arquivo1224_1.pdf: 980131 bytes, checksum: 9ec503bf8b08f7572b3251316bd93fba (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2009 / Conselho Nacional de Desenvolvimento Científico e Tecnológico / A ostra Crassostrea rhizophorae ocorre ao longo da costa do Brasil servindo como alimento para comunidades litorâneas e sua produção ajuda no desenvolvimento sócio-econômico local. Polidiariose é uma das diversas doenças presentes em ostreiculturas do mundo. É causada por poliquetas da família Spionidae que perfuram a concha e habitam uma bolha de lodo no interior da ostra, causando perda de valor comercial considerável. Oito gêneros de espionídeos podem ser responsáveis por esse dano, sendo chamados polidorídeos. A fauna associada e perfuradora da C. rhizophorae foi estudada em 5 estuários da costa de Pernambuco: rio Goiana, Canal de Santa Cruz, rio Capibaribe, rio Massangana e rio Sirinhaém. Foram coletadas 20 ostras nos horizontes do infralitoral e mediolitoral em três pontos ao longo de cada rio. Foi verificado que a maioria das ostras encontradas estavam abaixo do tamanho comercial (6 cm). A epifauna incrustante às ostras foi composta por poliquetos, cirripédios, tanaidáceos, moluscos e anêmonas, e diferiu entre os estuários. No rio Sirinhaém a diversidade foi maior, por outro lado o rio Capibaribe possui o infralitoral mais diverso. Foram encontradas duas espécies de polidorídeos: Polydora websteri e Boccardiella ligerica. As duas espécies ocorreram juntas nos rios Goiana e Sirinhaém; apenas P. websteri no Canal de Santa Cruz e rio Capibaribe; e estiveram ausentes no rio Massangana. Estas espécies são consideradas criptogênicas prejudicando diversos cultivos em muitos lugares do mundo e representam novas ocorrências para o litoral do Nordeste. As taxas de infestação e parasitismo foram diferentes em relação ao agente infeccioso e em relação ao local. Elas foram maiores nas ostras de maior tamanho e no estuário do rio Capibaribe

The aim of this thesis was to review the current state of knowledge, occurrence and distribution of two polydorid (Polychaeta: Spionidae) genera, Polydora and Dipolydora, in estuaries of subtropical eastern Australia. The existing taxonomy of the polydorid group is confused and descriptions include many relative terms. A numerical taxonomy approach using Primer 6 was taken to identify species groups and characters. A standardized set of multivariate morphological characters was developed and resemblance analysis functions used to create species cluster groups. SIMPER (similarity percentages) analysis on the same dataset was used to identify the diagnostic characters for each of these species cluster groups and to identify new characters which could be useful in species diagnosis, particularly for frequently occurring incomplete specimens.Prior to this study 3 Polydora species and 4 Dipolydora species were recorded from subtropical eastern Australia. The present study found 12 Polydora species and 10 Dipolydora species from estuaries and bays of subtropical eastern Australia.Two Polydora species are new (Polydora sp. P1 and Polydora cf. woodwicki) and 7 are potentially new species (P. cf. latispinosa; P. cf. websteri; P. sp. P2S; P. sp. P3S; P. sp. P4S; P. sp. P5S and P. sp. P6S) having been described from single specimens. Polydora cornuta Bosc, 1902 is recorded from New South Wales for the first time. Polydora cf. calcarea is reported from mudblisters in oysters. The Australian form of Polydora hoplura Claparède, 1870 and P. haswelli Blake and Kudenov, 1978 are described more fully than in existing literature.Three Dipolydora species are new (Dipolydora sp. D1; D. cf. flava and D. sp. D2) and 4 from single specimens are potentially new (D. cf. aciculata/ cf. giardi; D. sp. D3S; D. sp. D4S and D. sp. D5S). Dipolydora tentaculata (Blake and Kudenov, 1978) and Australian forms of Dipolydora flava (Claparède, 1870) and Dipolydora socialis (Schmarda, 1861) are described more fully than in existing literature.Prior to this study one Dipolydora and no Polydora were recorded from the Tweed- Moreton bioregion. This study reports 6 species of Dipolydora and 5 species of Polydora from this bioregion.Dipolydora penicillata (Hutchings and Rainer, 1979) and Carazziella victoriensis Blake and Kudenov, 1978 are recommended for synonymy.It is recommended that Polydora ciliata (Johnston, 1838) be reinstated and Dipolydora ciliata (Johnson, 1838) removed from the Australian polychaete checklist following identification of an error in description translation.Important gaps in collections were identified for polydorids associated with oysters from estuaries over the whole subtropical region; and for polydorids from the Tweed-Moreton IMCRA bioregion.

The aim of this thesis was to review the current state of knowledge, occurrence and distribution of two polydorid (Polychaeta: Spionidae) genera, Polydora and Dipolydora, in estuaries of subtropical eastern Australia. The existing taxonomy of the polydorid group is confused and descriptions include many relative terms. A numerical taxonomy approach using Primer 6 was taken to identify species groups and characters. A standardized set of multivariate morphological characters was developed and resemblance analysis functions used to create species cluster groups. SIMPER (similarity percentages) analysis on the same dataset was used to identify the diagnostic characters for each of these species cluster groups and to identify new characters which could be useful in species diagnosis, particularly for frequently occurring incomplete specimens.Prior to this study 3 Polydora species and 4 Dipolydora species were recorded from subtropical eastern Australia. The present study found 12 Polydora species and 10 Dipolydora species from estuaries and bays of subtropical eastern Australia.Two Polydora species are new (Polydora sp. P1 and Polydora cf. woodwicki) and 7 are potentially new species (P. cf. latispinosa; P. cf. websteri; P. sp. P2S; P. sp. P3S; P. sp. P4S; P. sp. P5S and P. sp. P6S) having been described from single specimens. Polydora cornuta Bosc, 1902 is recorded from New South Wales for the first time. Polydora cf. calcarea is reported from mudblisters in oysters. The Australian form of Polydora hoplura Claparède, 1870 and P. haswelli Blake and Kudenov, 1978 are described more fully than in existing literature.Three Dipolydora species are new (Dipolydora sp. D1; D. cf. flava and D. sp. D2) and 4 from single specimens are potentially new (D. cf. aciculata/ cf. giardi; D. sp. D3S; D. sp. D4S and D. sp. D5S). Dipolydora tentaculata (Blake and Kudenov, 1978) and Australian forms of Dipolydora flava (Claparède, 1870) and Dipolydora socialis (Schmarda, 1861) are described more fully than in existing literature.Prior to this study one Dipolydora and no Polydora were recorded from the Tweed- Moreton bioregion. This study reports 6 species of Dipolydora and 5 species of Polydora from this bioregion.Dipolydora penicillata (Hutchings and Rainer, 1979) and Carazziella victoriensis Blake and Kudenov, 1978 are recommended for synonymy.It is recommended that Polydora ciliata (Johnston, 1838) be reinstated and Dipolydora ciliata (Johnson, 1838) removed from the Australian polychaete checklist following identification of an error in description translation.Important gaps in collections were identified for polydorids associated with oysters from estuaries over the whole subtropical region; and for polydorids from the Tweed-Moreton IMCRA bioregion.

Submitted by Alberto Vieira (martins_vieira@ibest.com.br) on 2018-01-12T15:07:48Z No. of bitstreams: 1 617851.pdf: 5292414 bytes, checksum: 6c5754bce7c124ead811d6293f689170 (MD5) / Made available in DSpace on 2018-01-12T15:07:48Z (GMT). No. of bitstreams: 1 617851.pdf: 5292414 bytes, checksum: 6c5754bce7c124ead811d6293f689170 (MD5) Previous issue date: 2003-08 / A população de Scolelepsis cf. squamata da praia de Dois Rios, Ilha Grande, litoral sul do Estado do Rio de Janeiro, foi analisada durante as marés baixas de maio/2001, julho/01, novembro/01 e janeiro/02. A relação entre a distribuição espaço-temporal de S. squamata e a morfodinâmica da praia de Dois Rios foi examinada em escalas longitudinal e transversal, utilizando como variáveis a densidade e o tamanho da espécie. Foram traçados oito transectos que estiveram submetidos a diferentes influências hidrodinâmicas ao longo da praia. A face da praia foi dividida em três regiões transversais, de onde foram tomadas três réplicas aleatórias em cada um dos pontos ao longo da praia. As diferenças observadas na distribuição longitudinal foram explicadas pela morfodinâmica da praia, onde a densidade aumentou do estado de erosão (terraço de baixa mar) para o de deposição (refletivo) e o tamanho aumentou do estado de deposição para o de erosão. As exceções observadas, neste padrão foram explicadas pelo regime hidrodinâmico local. A relação observada entre tamanhos intermediários para grandes de S. squamata e a assimetria negativa do sedimento, mostram a importância do transporte passivo na distribuição da espécie. Não foi encontrada uma correlação entre a distribuição de S. squamata e o tamanho do grão, porém, foi encontrada uma evidente relação entre a distribuição da espécie e o transporte de sedimento marinho. Baixas densidades de S. squamata foram observadas durante períodos de alta hidrodinâmica, devido a sua baixa resistência ao transporte pela ação de ondas. Mesmo sob influência de alta hidrodinâmica, pequenos tamanhos de S. squamata foram encontrados durante este período, que coincidiu com o período de recrutamento da espécie. A associação observada entre a distribuição espaço-temporal de S. squamata, o estado morfodinâmico da praia e o transporte de sedimento em praias arenosas oceânicas. / A population of the spionid polychaete Scolelepis cf. squamata was studied on Dois Rios beach, an embayed oceanic beach located at Ilha Grande (a coastal island), at the southeastern Brazilian coast. The relationship between beach morphodynamics and the spatial-temporal distribution of this species along and across the beach was evaluated in relation to density and body size variables. Sampling was carried out during spring low tides of May/2001, July/2001, November/2001 and January/2002. Eight transects with different hydrodynamical influences were chosen along the entire beach. The intertidal beach was divided into three across-shore zones, where three replicate samples were randomly collected from each zone at each transect. Differences in S. squamata longshore distribution occurred mainly due to beach morphodynamics, where species densities increased from erosional (low tide terrace) to depositional (reflective) beach states and species body size increased from depositional to erosional ones. However, exceptions that could not be explained by the morphodynamic state per se, seems to be related to hydrodynamic patterns. The association between intermediate to large S. squamata body sizes and coarser skewed sands, shows the great importance of passive transport of individuals in determining species distribution. A correlation between sediment size and S. squamata distribution were not found, although a clear relationship between species distribution and marine sediment transport were found. S. squamata densities were lower during high hydrodynamic periods due to their weaker resistance to transport by wave action. In spite of the high hydrodynamics, smallest S. squamata body sizes were found in this period, that coincided with a species recruitment. The close association observed among S. squamata spatialtemporal distribution, morphodynamic beach state and sediment transport, supports the hypothesis that this species density and body size distribution might be used as a tool for correlating beach morphodynamics, hydrodynamics and sediment transport in oceanic sandy beaches.