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Registros recuperados: 19 | |
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Hofker, J.. |
INTRODUCTION Of the bottom material collected by the Snellius-Expedition 78 samples contained Foraminifera. Many of these samples were extremely small, since they were gathered by means of piston core samplers; some were larger, as they were collected by means of a dredge; others were samples in shallow water at beaches or reefs. A l l samples were fixed in formaldehyde, so that after the 40 years they remained in store before they were studied, rests of protoplasma were seldom preserved. The numerous plankton samples, preserved in formaldehyde or in alcohol, did note contain planktonic Foraminifera; obviously the small amount of CaC03 in the samples caused the dissolution of the tests. The planktonic Foraminifera are not described here, as planktonic... |
Tipo: Article / Letter to the editor |
Palavras-chave: Foraminifera; Indonesia; Snellius Expedition 30; 42.94. |
Ano: 1978 |
URL: http://www.repository.naturalis.nl/record/323936 |
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Hartog, J.C. den. |
Op 1 juni 1982, 's morgens om 9 uur, vertrok het Nederlandse oceanografische vaartuig "Tydeman" uit de haven van Santa Cruz de Tenerife voor een marien-biologische expeditie naar de Kaapverdische eilanden. Aan boord bevond zich een team van onderzoekers en assistenten van het Rijksmuseum van Natuurlijke Historie, het Rijksherbarium (beiden uit Leiden) en het Geologisch lnstituut van de Universiteit van Groningen. De expeditie paste in het kader van het zogenaamde CANCAP-project (no. 45) van genoemde instituten, waarmee reeds in 1976 werd aangevangen. Drs. J.C. den Hartog, medewerker van het Rijksmuseum van Natuurlijke Historie, was aan boord van de "Tydeman" en zette zijn bevindingen voor dit tijdschrift op papier. |
Tipo: Article / Letter to the editor |
Palavras-chave: Capeverdian Islands; Marine biology; CANCAP; 42.94. |
Ano: 1985 |
URL: http://www.repository.naturalis.nl/record/460098 |
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Voorthuysen, J.H. van. |
SUMMARY The Ria de Arosa is a large inlet of the Atlantic in western Galicia, NW Spain. It is little influenced by river discharge, the salinity is therefore the normal one for sea water, 33-36°/oo. According to Cadée (1968) the rocks exposed on the coast are for for the greater part granites; the rest, especially on the northwestern and northern coast, being gneisses and micaschists. Seven foraminiferal facies could be made. The L/D ratio is extremely low. It varies from zero to 18.5; the medium ratio is 2.3. Transport of shells from the continental shelf into the bay is rather high and more or less confined to the outer bayzone. The Recent foraminiferal fauna of the Arosa Bay has a fairly large number of species in common with the littoral Pliocene and... |
Tipo: Article / Letter to the editor |
Palavras-chave: 42.94. |
Ano: 1973 |
URL: http://www.repository.naturalis.nl/record/317768 |
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Hartog, J.C. den. |
Volgens gangbare inzichten zijn vrijwel alle oceanische eilanden uit zee opgerezen, wat impliceert dat ze oorspronkelijk kaal en zonder enig leven waren. Biologen zijn daarom bijzonder geïnteresseerd in het karakter en de herkomst van de huidige flora en fauna van die eilanden en in de kolonisatieprocessen. In het algemeen kan men stellen dat de kans op kolonisatie kleiner is naarmate een eiland verder van het vasteland (of van een ander eiland) verwijderd ligt. In feite is de zaak natuurlijk wel iets gecompliceerder, en spelen allerlei factoren een rol. Voor landorganismen zijn dit onder meer de klimatologische en meteorologische omstandigheden in het te overbruggen gebied, en de vestigingsmogelijkheden in de nieuwe omgeving. Kolonisatie door mariene... |
Tipo: Article / Letter to the editor |
Palavras-chave: Islands; Transformation; Colonisation; Endemism; Saint Helena; 42.94. |
Ano: 1985 |
URL: http://www.repository.naturalis.nl/record/460100 |
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Peijnenburg, K.T.C.A.; Goetze, E.. |
Open ocean zooplankton often have been viewed as slowly evolving species that have limited capacity to respond adaptively to changing ocean conditions. Hence, attention has focused on the ecological responses of zooplankton to current global change, including range shifts and changing phenology. Here, we argue that zooplankton also are well poised for evolutionary responses to global change. We present theoretical arguments that suggest plankton species may respond rapidly to selection on mildly beneficial mutations due to exceptionally large population size, and consider the circumstantial evidence that supports our inference that selection may be particularly important for these species. We also review all primary population genetic studies of open ocean... |
Tipo: Article / Letter to the editor |
Palavras-chave: Adaptation; Climate change; Marine; Oceanic; Selection; Zooplankton; 42.72; 42.94. |
Ano: 2013 |
URL: http://www.repository.naturalis.nl/record/470572 |
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Hoeksema, B.W.. |
The coastal waters of East Kalimantan are part of the western boundary of the Indo-West Pacific centre of maximum marine biodiversity. During the pilot phase of the East Kalimantan Program (EKP) this has been tested by various specialists who used model taxa to test this hypothesis. Emphasis has been put on the species-rich coral reefs and islands that show reef communities in association with mangroves, seagrass, and algae. A range of habitats has been surveyed, varying in distance offshore (with decreasing salinity, turbidity, sedimentation and nutrient load): fringing reefs along the mainland shore, offshore patch reefs, delta-front barrier reefs, and uplifted atolls. The atolls consist of limestone rock and contain shallow enclosed marine lakes with a... |
Tipo: Report |
Palavras-chave: Marine biodiversity; Berau region; Kalimantan; Indonesia; 42.94. |
Ano: 2004 |
URL: http://www.repository.naturalis.nl/record/268594 |
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Stel, J.H.. |
Indonesia is the largest archipelago in the world (1.8 million km2 of land, 3.1 million km2 of sea, plus a 200 miles Exclusive Economic Zone covering some 2.7 million km2). Its population, ranking number four on the world list, amounts to more than 216 million people. Marine related programmes are given a high priority in Indonesia. During the last two decades the government has carried out a concerted effort in marine capacity building through bilateral, regional and international co-operation. This effort included increasing man-power development, expanding and improving research facilities, establishing a national marine data centre, improving co-operation within the Indonesian marine science community, and international co-operation. The bilateral... |
Tipo: Article / Letter to the editor |
Palavras-chave: Indonesia; Science policy; Marine capacity building; Global Ocean Observing System; International and regional co-operation; 42.94. |
Ano: 2001 |
URL: http://www.repository.naturalis.nl/record/219446 |
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Wolff, W.J.. |
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........ |
Tipo: Article / Letter to the editor |
Palavras-chave: 42.94. |
Ano: 1973 |
URL: http://www.repository.naturalis.nl/record/317711 |
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Gili, J.-M.; Alvà, V.; Coma, R.; Orejas, C.; Pagès, F.; Ribes, M.; Zabala, M.; Arntz, W.; Bouillon, J.; Boero, F.; Hughes, R.G.. |
Benthic suspension feeders are abundant in littoral and shallow sub-littoral ecosystems, where they feed on the plankton and on organic matter suspended in the water column. Recent studies indicate that active suspension feeders with powerful water filtration mechanisms (e.g., bivalve molluscs) may exert an important influence on the abundance and production of phytoplankton, and probably zooplankton as well. Passive suspension feeders, such as hydrozoans, have received less attention, and their effect on shallow planktonic communities is poorly understood. This paper presents evidence that hydrozoans, which make only a minor contribution to benthic community biomass, capture large amounts of zooplankton and seston, and that they may play an important role... |
Tipo: Article / Letter to the editor |
Palavras-chave: Benthic passive suspension feeders; Shallow marine ecosystems; Hydroids.; 42.72; 42.94. |
Ano: 1998 |
URL: http://www.repository.naturalis.nl/record/317751 |
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Hofker, J.. |
INDEX Introduction.................................................................................................................................... P. 5 List of samples studied for Foraminifera .................................................................................... P. 7 Alphabetic list of species found in the samples .......................................................................... P. 10 Notes on the distribution of some species .................................................................................. P. 16 Systematic part .............................................................................................................................. P. 19 Genus Reophax Montfort, 1808... |
Tipo: Article / Letter to the editor |
Palavras-chave: 42.94. |
Ano: 1983 |
URL: http://www.repository.naturalis.nl/record/317864 |
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Registros recuperados: 19 | |
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