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

Along the coast of St. Martin, St. Eustatius and Saba the rocks above sea-level often show a number of differently coloured zones. This is clearly visible when the coast over a larger distance is formed by one type of rock, as for instance on Saba. In many places a light-coloured belt is seen above the zone with algal growth; still higher the rocks are dark-coloured (Fig. 11, 17 and 22). The uppermost part of the light-coloured zone indicates rather exactly the height of the waves at low tide (splash zone). The darkcoloured zone is wet from finely dispersed water (spray zone). Sometimes differently coloured zones are formed (Fig. 13) which may, however, be correlated with the above mentioned ones on account of their organisms. Below the algal zone on open...

Notes on some Ceramiaceae (Rhodophyta) from Curaçao, especially those from the exposed northeast coast

Ano: 1968

URL: http://www.repository.naturalis.nl/record/506305

Stegenga, H.; Vroman, M..

Twenty-five species of the red algal family Ceramiaceae are reported from the exposed northeast coast of the Caribbean island of Curaçao. Some of the more interesting finds are discussed in some detail, and one species, Spermothamnion antillarum, is described as new to science. Twelve species are recorded from the island for the first time. A survey of all Ceramiaceae ever recorded from Curaçao yields a total of 60 species, an uncommonly high number for any Caribbean region. Explanations for this high number may be found in the large variety of habitats and the relatively intense study the marine environment has undergone on this island.

The Marine Algal vegetation of St. Martin, St. Eustatius and Saba

Ano: 1987

URL: http://www.repository.naturalis.nl/record/524970

Although algology deals with a large group of plants, widespread and of a great morphological diversity, the history of this branch of botany is fairly young. Linnaeus (1753) listed in his Species Plantarum under the heading “Cryptogamia—Algae” only five genera of plants which are still accepted as algae at the present time. Under the same heading he also described a number of liverworts, lichens and sponges and a few other things.

Additions to the marine algal flora of Curaçao, Netherlands Antilles

Ano: 1968

URL: http://www.repository.naturalis.nl/record/535126

Stegenga, H.; Vroman, M..

Nine species of benthic marine algae are reported from the Caribbean island of Curaçao for the first time: Chlorophyta: Derbesia marina and Trichosolen longipedicellata; Phaeophyta: Ectocarpus rhodochortonoides, Feldmannia elachistaeformis, Hecatonema floridanum, Herponema tortugense and Sphacelaria novae-hollandiae; •; Rhodophyta: Polysiphonia scopulorum and Polysiphonia sphaerocarpa. The Curaçao algal flora, with at present about 350 species recorded with reasonable certainty, equals some of the richest known areas in the Caribbean.

Taraxacum limnanthes Haglund subsp. limnanthoides Van Soest op Schiermonnikoog

Ano: 1988

URL: http://www.repository.naturalis.nl/record/525642

Vroman, M.; Ietswaart, J.H..

Taraxacum limnanthes was described by HAGLUND (1946). VAN SOEST (1965) distinguishes two subspecies. One of these, subsp. limnanthoides, occurs in the Netherlands. In this country it is found on the Wadden Islands, near the IJssel Lake (the former Zuiderzee), and in Zeeland. The present paper is concerned with investigations on Schiermonnikoog (one of the Wadden Islands). Here T. limnanthes subsp. limnanthoides occurs in an area with a west to east salt gradient. The habitat of maximum abundance consists of moist dune valleys characterized by a peaty soil. The soil water, which is practically fresh, has a strongly fluctuating level. The adjacent salt marshes which are periodically inundated by the sea show a lower density of the species. T. limnanthes...

Study of a peat profile on the Frisian Coast of the former “Zuiderzee”

Ano: 1972

URL: http://www.repository.naturalis.nl/record/526760

The subject of this study are soil samples taken in the “Makkumer Waard”, a wide expanse of low-lying land, which follows the Frisian coast. Stratigraphical and palynological investigations showed that in the beginning of the Atlanticum the area lay below the level of the sea, but that gradually the influence of the sea decreased and peat formation became possible. From the transition from marine deposits to Sphagnum peat (— 4,55 m to — 3,50 m) we must conclude that there has been a temporary standstill in the transgression, or even a regression, in the middle of the Atlanticum. Towards the end of the Atlantic period a sudden marine transgression followed, which deposited a layer of sand and clay on the Sphagnum peat (— 3,50 m to — 3,30 m). Shortly before...

A new species of Stichothamnion (Rhodophyta) from the West Indies

Ano: 1952

URL: http://www.repository.naturalis.nl/record/534829

The genus Stichothamnion (Rhodomelaceae) was described by Borgesen in 1930, on the basis of material from the north western coast of Gran Canaria (Canary Islands). During our investigation of marine algae collected from the Netherlands Antilles it appeared that on St. Eustatius (Lesser Antilles) an unknown species was gathered, that also has to be placed in the genus Stichothamnion. This material was of sufficient quality to allow a complete description of the species.

Taraxacum euryphyllum (Dahlst.) Christ. op Schiermonnikoog

Ano: 1967

URL: http://www.repository.naturalis.nl/record/534941

Hommes, T.G.; Roeleveld, J.G.; Vroman, M..

Taraxacum euryphyllum (Dahlst.) Christ, occurs on the West Frisian Island of Schiermonnikoog in a single area of c. 200 m², situated in a moist practically fresh duneslack. The plants grow on rather open places in a vegetation with much Schoenus nigricans. This vegetation can be described as a local Schoenetum variant, related to the association Junco baltici-Schoenetum nigricantis with indications of a progressing succession.

Seizoensveranderingen bij bladeren van Taraxacum

Ano: 1972

URL: http://www.repository.naturalis.nl/record/528027

Ietswaart, J.H.; Vroman, M..

During a whole year several aspects of the seasonal variation in the leaves of four Taraxacum species were studied on the island of Schiermonnikoog. The species investigated are T. lacistophyllum T. commixtum, T. nordstedtii and T. limnanthes. The vegetation types in which the specimens studied occur are briefly described. The results for the first three species show a great deal of similarity. The plants have deeply incised leaves in spring. The degree of incision gradually decreases from May until September, when several specimens have leaves with completely entire margins. After September the degree of incision increases slowly, until the situation with deeply incised leaves is reached again in May. In T. limnanthes, a species which never has incised...