SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Wolff, W.J.; Stegenga, H..

INTRODUCTION AND METHODS During an investigation of distribution and ecology of the Archiannelida of the estuarine area of the rivers Rhine, Meuse and Scheldt in the southwestern part of The Netherlands, three species of polychaetes new to the Dutch fauna were found. Because these species have not been reported very frequently from other localities, the finds are described in some detail. The first two species were found in samples taken with a o.i m2 Van Veengrab; the last one originated from a core sample taken in the beach. After collecting the samples have been treated in the way described by Boaden (1963). RESULTS AND DISCUSSION Hesionura augeneri (Friedrich, 1937) (fig. 2) This species was found at two localities in the coastal water (fig. 1) at...

Three species of Microphthalmus (Polychaeta) new to The Netherlands

Palavras-chave: 42.76.

Ano: 1975

URL: http://www.repository.naturalis.nl/record/317203

INTRODUCTION The excellent monograph by Westheide (1967) of the hesionid genera Hesionides and Microphthalmus provided the means to study these genera in The Netherlands. Until now no species belonging to either of these genera have been recorded from this country. Nevertheless, several species of Microphthalmus were found during our ecological studies on the polychaetes of the estuarine area of the rivers Rhine, Meuse, and Scheldt. One of these species, M. fragilis Bobretzky, was so far only known from the Mediterranean and the Black Sea. In the present paper three species are recorded and described. The positions of the localities where these species were found are shown on the map (fig. 1). Ecological data will be published later. Acknowledgements are...

Résultats Biologiques de L'expédition Snellius. Echinodermata: Ophiuroidea I

Palavras-chave: 42.76.

Ano: 1969

URL: http://www.repository.naturalis.nl/record/317970

Guille, A.; Wolff, W.J..

During our studies of this first part of the brittle-stars collection of the Snellius Expedition (1929-1930) in Indonesia, 37 species were found. Among these, a new genus and a new species of Amphiurid, Paramphichondrius tetradontus, are described; Ophiothrix picteti Loriol is transferred from the subgenus Acanthophiothrix to Ophiothrix s.s.; 17 other species, either rare or of taxonomically confused status, are discussed, i.e., Astroceras elegans, Ophiocentrus koehleri and O. vexator, Macrophiothrix belli, M. longipeda, M. rhabdota, and M. sp. aff. variabilis, Ophiothrix contenta, O. savignyi and O. trilineata (with a new synonym: O. tristis), O. (Acanthophiothrix) armata, O. (A.) spinossissima, O. (Keystonea) martensi, O. (Placophiothrix) hybrida and O....

Notes on Eurydice (Isopoda, Flabellifera) from the Netherlands

Palavras-chave: Echinodermata; Ophiuroidea; Taxonomy; Indonesia.; 42.72.

Ano: 1984

URL: http://www.repository.naturalis.nl/record/317834

INTRODUCTION During his investigation of the amphipod fauna of the sandy beaches of the Netherlands, Mr. W. J. M. Vader, formerly of this institute, met with two species of Eurydice Leach, 1815. Besides the common Eurydice pulchra Leach, 1815, he found a second species in smaller numbers. Because Giordani Soika (1955) as well as Renaud-Debyser & Salvat (1963) recorded Eurydice affinis Hansen, 1905, and E. pulchra from comparable beaches in northern France, Mr. Vader asked Dr. B. Salvat for some specimens of the former species for comparison. When these specimens arrived, Mr. Vader had left our laboratory. He was kind enough to entrust me with the further study of the Eurydice problem, for which I am most indebted to him. Further I want to thank Dr. L....

Non-indigenous marine and estuarine species in The Netherlands

Palavras-chave: 42.74.

Ano: 1966

URL: http://www.repository.naturalis.nl/record/318638

An overview is presented of non-indigenous marine and estuarine plant and animal species recorded from The Netherlands. In this list both exotic species from outside NW Europe and non-indigenous species from elsewhere in NW Europe are enumerated. Species that have been suggested to be non-indigenous in The Netherlands but for which insufficient evidence could be found are discussed shortly as well. The list is based mainly on literature data supplemented by own observations of the author. At least 99 plant and animal species have been introduced from elsewhere in the world. Another 13 species have been introduced from other parts of NW Europe. The third category of dubious non-indigenous species enumerates 37 species. The list is preceded by an...

The estuary as a habitat an analysis of data on the soft-bottom Macrofauna of the Estuarine area of the rivers rhine, Meuse, and Scheldt

Palavras-chave: Non-indigenous species; Introduced species; Exotic species; Alien species; Invasive species; The Netherlands; North Sea; Wadden Sea; Oosterschelde estuary; Estuaries; 42.94.

Ano: 2005

URL: http://www.repository.naturalis.nl/record/210096

CONTENTS 1. Introduction.................. 5 2. Methods................... 8 2.1. Sampling methods.............. 8 2.2. Sorting and preservation of the samples.......... 10 2.3. Measuring methods for the environmental factors....... 10 2.3.1. Introduction............... 10 2.3.2. The grain-size data............. 10 2.3.3. Amount of organic matter............ 12 2.3.4. The interstitial water............ 14 2.3.5. Exposure to waves............. 14 2.4. Mathematical methods.............. 15 3. The environment................. 17 3.1. Weather and climate............... 17 3.2. The morphology of the Delta area........... 19 3.3. Substrate and sediments.............. 20 3.3.1. Types of sediments and substrate.......... 20 3.3.2. Distribution of sediments........

The estuary as a habitat: an analysis of data on the soft-bottom macrofauna of the estuarine area of the Rivers Rhine, Meuse, and Scheldt

Palavras-chave: 42.94.

Ano: 1973

URL: http://www.repository.naturalis.nl/record/317711

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