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.
Results
Showing 1 to 6 of 6 for “"Polydora"”.
-
Studies on the reproduction and larval biology of Polydora Giardi Mesnil (Polychaeta: Spionidae)
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 …
-
Sediment-associated cues for larval settlement of Polydora cornuta and Streblospio benedicti (Polychaeta, Spionidae)
… spionid polychaetes with indirect development: Polydora cornuta and Streblospio benedicti. Larvae were able to accept or reject attractive and unattractive sediment qualities in the assays in a species specific manner. Two out of 15 tested bacterial isolates significantly triggered settlement of …
-
Do microbial or biochemical settlement cues on the sediment surface mediate larval settlement of Polydora cornuta and Streblospio benedicti (Polychaeta, Spionidae)?
… abundance patterns of spionid polychaetes i.e. Polydora cornuta and Streblospio benedicti with indirect larval development were found in sediments of tidal flats in the German Wadden Sea. These patterns were not explicable through grain size or other sediment parameters. This led to the …
-
A response surface investigation of the larval tolerances of three spionid polychaetes to temperature, salinity and food concentration
… identical geographic ranges. The other was Polydora giardi a common coinhabitant with B. columbiana. In addition a third independent parameter, food concentration, was added to the study of B. columbiana and P. giardi.</p> <p>The larvae of the two Boccardia species were extremely euryhaline, …
-
Efecto de los depósitos de gas somero del fondo marino en las comunidades macrobentónicas del estuario de Bahía Blanca
… Aricidea sp. y nematodes, y otros ausentes como Polydora cornuta y Monocorophium insidiosum lo que indicaría una alta sensibilidad de estas especies al gas. La diferencia en la estructura comunitaria entre sitios fue explicada por el contenido de materia orgánica de los sedimentos. Además, la …
-
History and status of oyster exploitation and culture in South Africa, and the role of oysters as vectors for marine alien species
… the latter treatment (e.g. 88.5% of the mudworm Polydora hoplura died after 20 sec compared to 97.5% after 18 h in freshwater). However, only a single reproductive individual of an alien species may be required for a successful introduction, and soaking for 20 sec in heated seawater would still …