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

Morphological descriptions and distributional data are presented on three species recently introduced into the SW. Netherlands and predominantly occurring in the non-tidal Lake Grevelingen and Lake Veere. Both Asperococcus scaber and Acrochaetium balticum are European species which have rarely been reported after their initial description; Leathesia verruculiformis is apparently an introduction from the NW. Pacific and has not yet been reported from other European sites, maybe due to its very small size.

The genus Ptilothamnion (Ceramiaceae, Rhodophyta) in South Africa, with the description of P. goukammae spec. nov

Ano: 2000

URL: http://www.repository.naturalis.nl/record/527064

Stegenga, Herre; Bolton, John J.; Anderson, Robert J..

The genus Ptilothamnion Thur. in Le Jolis is represented in South Africa by three, or possibly four species: P. codicolum, P. polysporum, P. goukammae spec. nov., and reportedly P. subsimplex, all recorded after 1983. An earlier record of P. pluma is probably erroneous. The new species differs from known representatives of the genus by producing strictly one involucral filament from the hypogenous cell and additionally one from the subhypogenous cell. Ptilothamnion is a widespread genus, but rarely with more than two species in any given regional flora. A critical comparison of the c. 12 species shows that very few characters are shared by all of them.

Nieuw gevestigde soorten van het geslacht Polysiphonia (Rhodophyta, Rhodomelaceae) in Zuidwest-Nederland

Palavras-chave: Ceramiaceae; Ptilothamnion; Spermothamnieae; South Africa; Taxonomy.

Ano: 2002

URL: http://www.repository.naturalis.nl/record/525492

Morphological descriptions are given of two species of Polysiphonia introduced into SW Netherlands’ coastal waters in recent years, namely: P. devoniensis, formally described only in 1993 and previously known from SW England, and P. senticulosa which is regarded as an “alien” and probably originates from the northern Pacific. The confusion surrounding the identity of P. “violacea” in the Netherlands is discussed: it is concluded that only a few old records (1940, 1951) belong to P. fibrillosa, but that all recent finds belong to P. harveyi, now a very common species; the latter’s introduction dates back to 1960. A revised key to the Dutch Polysiphonia species with four pericentral cells is given.

Overzicht van de roodwier-exoten in de mariene wateren van Zuidwest-Nederland

Ano: 1998

URL: http://www.repository.naturalis.nl/record/527110

Stegenga, Herre; Karremans, Mart.

"Review of the red algal exotics in the marine waters of the Southwest Netherlands Seventeen species belonging to the Rhodophyta are at this moment recognized as alien introductions in the Southwest Netherlands. They all appear to have been introduced here since 1950, although some have been on the western European coast much longer. The majority of the species originates in the Far East, the type locality usually being Japan. This is explained by the temperature characteristics of the sea water being rather similar locally – and different from the oceanic areas like Brittany, Southwest England, and Ireland. Some of the species settled in the Netherlands are not known from these areas."

Zeewieren van de voormalige oesterputten bij Yerseke

Ano: 2015

URL: http://www.repository.naturalis.nl/record/579110

Stegenga, Herre; Karremans, Mart; Simons, Jan.

De voormalige oesterputten van de Yerseksche Oesterbank vormen een geschikt habitat voor veel benthische algen in dit voor het overige door zacht substraat gekenmerkte deel van de Oosterschelde. Reeds vele jaren wordt hier een flora gevonden die qua samenstelling uniek is in Nederland. Gedurende de laatste decennia is de floristische karakteristiek van het gebied echter veranderd, waarbij geïntroduceerde organismen een hoofdrol zijn gaan spelen. Ulva pertusa, Sargassum muticum, Undaria pinnatifida, Agardhiella subulata, Dasya baillouviana, Dasysiphonia spec. en Polysiphonia senticulosa, vaak met als ondergrond de eveneens geïmporteerde Japanse oester Crassostrea gigas, domineren nu dikwijls het aspect, hoewel de meeste soorten grote seizoensvariatie...

Recente veranderingen in de Nederlandse zeewierflora I. Additionele soorten van Hincksia, Herponema en Kuetzingiella (Ectocarpaceae, Phaeophyta)

Ano: 2007

URL: http://www.repository.naturalis.nl/record/526694

The first occurrence in the Netherlands is reported of Hincksia hincksiae, H. intermedia, Herponema solitarium and Kuetzingiella battersii. Descriptions and illustrations are given, and a revised key to the Dutch species of Hincksia is provided.

Veranderingen in de zeewierflora van Zuidwest-Nederland: verschil in vestiging en verspreidingspatroon tussen inheemse Europese soorten en exoten

Ano: 1996

URL: http://www.repository.naturalis.nl/record/527544

De zeewierflora van Zuidwest-Nederland verkeert wat betreft soortenrijkdom en soortensamenstelling in een fase van snelle verandering. Sedert 1991 is het aantal vastzittend gevonden soorten met 44 vermeerderd, een toename van het bekende soortental met meer dan 20%. Hiervan worden er 12 als exoten beschouwd, de overige soorten zijn autochtoon Europees. Het aandeel van exotische introducties is hiermee hoger dan langs veel andere delen van de Europese kust en ze dragen daarom in belangrijke mate bij aan de sterke stijging van het aantal soorten dat sinds 1983 is waargenomen. Een nadere analyse van locale (i.e. Zuidwest-Nederlandse) verspreidingspatronen van de nieuw-gevonden soorten laat zien dat: 1. Exoten zijn vaak zich snel uitbreidende soorten; ze...

De gevolgen van de compartimentering van de Zuidwest-Nederlandse zoute en brakke wateren voor de diversiteit van bruin- en roodwieren

Ano: 2005

URL: http://www.repository.naturalis.nl/record/527738

This study examines the development of brown and red algal species richness and distribution in the Southwest Netherlands’ saline and brackish waters following the execution of the Delta Hydrotechnical Works. These works have produced a de facto compartmentalisation of the formerly more or less continuous estuarine area. We now have a saline tidal sea arm (Oosterschelde), saline and brackish stagnant lakes (Grevelingen and Veerse Meer, respectively), as well as remnants of the estuarine habitat (Westerschelde, Nieuwe Waterweg). A comparison of the recent situation with the one that existed before any great alterations took place shows: 1. Species richness of the marine flora on this (regional/local) scale is largely dependent on salinity. 2. An overall...

Recente veranderingen in de Nederlandse Zeewierflora III. Nieuwe vestigingen van soorten in de roodwiergenera Choreocolax (Choreocolacaceae), Grateloupia (Cryptonemiaceae), Ceramium en Seirospora (Ceramiaceae)

Ano: 2002

URL: http://www.repository.naturalis.nl/record/528073

Stegenga, Herre; Otten, Ben G..

First autochtonous records, in the Netherlands, are reported of Choreocolax polysiphoniae, Grateloupia doryphora, Ceramium cimbricum and Seirospora interrupta. Morphological descriptions and illustrations are given for each of them. Ceramium cimbricum is discussed in some more detail since the Dutch material seems to show a much narrower range of morphological variation than reported elsewhere.

Checklist of the marine algae of the Netherlands

Ano: 1997

URL: http://www.repository.naturalis.nl/record/527139

Stegenga, Herre; Mol, Ivo; Prud’homme van Reine, Willem F.; Lokhorst, Gijsbert M..

A list of the multicellular marine algae found along the coast of the Netherlands is given, the first complete update on the “Flora van de Nederlandse Zeewieren” (Stegenga & Mol 1983). The number of recognized species has increased from 267 to 327. Of these, 229 are autochthonous, the remainder is only known from drift material [Chlorophyta: 76 autochthonous + 1 drift; Phaeophyta: 73 + 22; Rhodophyta: 80 + 75]. Additions to the flora appear to originate from neighbouring countries as well as from the North Pacific. One new combination is made: Cotaconema dasyae (Collins) Stegenga, Mol, Prud’homme et Lokhorst, now comb. [Basionym: Acrochaetium dasyae Collins, Rhodora 8: 191 (1906)].

Recente veranderingen in de Nederlandse Zeewierflora II. Additionele soorten bruinwieren (Phaeophyta) in de genera Botrytella en Feldmannia (Ectocarpaceae), Leptonematella (Elachistaceae) en Stictyosiphon (Striariaceae)

Ano: 1997

URL: http://www.repository.naturalis.nl/record/528200

Stegenga, Herre; Mol, Ivo.

First records for the Netherlands are reported of the brown algae Botrytella reinboldii, Feldmannia globifera, Leptomatella fasciculata and Stictyosiphon soriferus; morphological descriptions and illustrations are given. Previously reported Dutch material of Sorocarpus micromorus has been reidentified, and is probably identical with Pacific species known as Ectocarpus sorocarpoides or Sorocarpus pacifica.