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Registros recuperados: 68
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Riffauna van Bali rijker Naturalis
Hoeksema, B.W..
In de inleiding van de serie 'Met Naturalis in zee' (Onderwatersport januari/februari 2003) werd een overzicht gegeven van 20 jaar koraalrifonderzoek door Naturalis in de Indo-Pacific. In deze aflevering wordt een beeld gegeven van de recente Naturalis expeditie naar Bali met enkele bijzondere waarnemingen. In de komende aflevering zal de aandacht worden gevestigd op enkele diersoorten van en nabij Bali die voor het eerst en nog nooit elders zijn waargenomen.
Tipo: Article / Letter to the editor Palavras-chave: Koraalrifonderzoek; Indo-Pacifisch gebied; 42.65.
Ano: 2003 URL: http://www.repository.naturalis.nl/record/270183
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Mondige paddestoelkoralen Naturalis
Hoeksema, B.W..
Koralen met een losbandig leven. Dat was het onderwerp van de vorige 'Met Naturalis in zee'. Vrij levende paddestoelkoralen dus. Maar sommige soorten van die paddestoelkoralen hebben één grote mond, terwijl ander beschikking hebben over meerdere monden. Van belang als overlevingsstrategie.
Tipo: Article / Letter to the editor Palavras-chave: Koraalrifonderzoek; Indo-Pacifisch gebied; Fungiidae; 42.65; 42.72.
Ano: 2006 URL: http://www.repository.naturalis.nl/record/270354
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Hollandse nieuwe : informatie over de Nederlandse mariene fauna Naturalis
Hoeksema, B.W..
In eerdere afleveringen van de serie 'Met Naturalis in zee' stond Nederlands onderzoek in Indonesië centraal. Het Naturalis zeeteam is direct betrokken bij het in kaart brengen van soorten organismen die in de wereldzeeën voorkomen. Naturalis heeft o.a. als taak om samen met collega-instituten in andere landen de soortenrijkdom van onze planeet te bepalen.
Tipo: Article / Letter to the editor Palavras-chave: Mariene fauna; Nederland; 42.65.
Ano: 2005 URL: http://www.repository.naturalis.nl/record/270234
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A bibliographic overview of marine research at Universitas Hasanuddin (1973-1992) Naturalis
Hoeksema, B.W.; Moka, W..
A list of research papers, essays and abstracts on marine sciences is given, which were published by Hasanuddin University in the years 1973-1992. The purpose of this bibliography is to increase the accessibility of this information to students and scientists interested in marine sciences at UNHAS.
Tipo: Article / Letter to the editor Palavras-chave: Marine sciences; Universitas Hasanuddin; Bibliography; 42.94.
Ano: 1994 URL: http://www.repository.naturalis.nl/record/268554
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Mariene flora en fauna te boek Naturalis
Hoeksema, B.W.; Gittenberger, A..
Het aantal boeken over de Nederlandse flora en fauna neemt gestaag toe. En ook de afgelopen jaren zijn er weer aardig wat nieuwe titels uitgekomen over het Nederlandse zeeleven. Op deze pagina's vier van die boeken. Eerder, in de Onderwatersport van april 2005, is ook al een aantal titels gepresenteerd van publicaties die mogelijk de moeite waard zijn om kennis te vergaren over de planten en dieren die tijdens het duiken in Nederland de revue passeren.
Tipo: Article / Letter to the editor Palavras-chave: Literatuur; 42.94.
Ano: 2006 URL: http://www.repository.naturalis.nl/record/270358
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Vinstralen in vis en gruis Naturalis
Hoeksema, B.W..
Uit het artikel "Over de rugschildjes van Sepolia atlantica en andere kleine inktvisjes" (Buizer & Doeksen, 1977) blijkt dat resten van vinstralen van in zee levende beenvissen, behalve in die vissen zelf, ook in schelpengruis op het strand aangetroffen kunnen worden. In het laatste geval is echter het verband verloren gegaan, dat er bestaat tussen de plaats en de bouw van de vinstraal enerzijds en de funktie daarvan anderzijds. In het kort volgt hieronder het resultaat van een onderzoekje naar de bouw en de funktie van met name de staartvinstralen, uitmondend in een vergelijking met de bevindingen van Buizer & Doeksen.
Tipo: Article / Letter to the editor Palavras-chave: Beenvissen; Vinstralen; 42.81.
Ano: 1978 URL: http://www.repository.naturalis.nl/record/268954
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Host specificity and phylogenetic relationships among Atlantic Ovulidae (Mollusca: Gastropoda) Naturalis
Reijnen, B.T.; Hoeksema, B.W.; Gittenberger, E..
Ovulid gastropods and their octocoral hosts were collected along the leeward coast of Curaçao, Netherlands Antilles. New molecular data of Caribbean and a single Atlantic species were combined with comparable data of Indo-Pacific Ovulidae and a single East-Pacific species from GenBank. Based on two DNA markers, viz. CO-I and 16S, the phylogenetic relationships among all ovulid species of which these data are available are reconstructed. The provisional results suggest a dichotomy between the Atlantic and the Indo-Pacific taxa. Fully grown Simnialena uniplicata closely resembles juvenile Cyphoma gibbosum conchologically. Cymbovula acicularis and C. bahamaensis might be synonyms. The assignments of Caribbean host species for Cyphoma gibbosum, C....
Tipo: Article / Letter to the editor Palavras-chave: Anthozoa; Alcyonacea; Caribbean; Curaçao; Molecular phylogeny; Symbiosis; 42.73.
Ano: 2010 URL: http://www.repository.naturalis.nl/record/336926
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Het zuurtjeskoraal en anderer kleurrijke koralen Naturalis
Hoeksema, B.W..
In de vorige aflevering van de serie 'Met Naturalis in zee' (Onderwatersport september 2003) werd een indruk gegeven van de expeditie naar Bali die door Naturalis was georganiseerd. Enkele bijzondere vondsten kwamen aan bod. In deze aflevering twee door Bert W. Hoeksema ontdekte onbekende diersoorten van Bali, het zuurtjeskoraal, een slak die daarop leeft en enkele van hun naaste familieleden. Zowel bij de koralen als de slakken gaat het om bijzonder kleurrijke dieren.
Tipo: Article / Letter to the editor Palavras-chave: Koraalrifonderzoek; Indo-Pacifisch gebied; Bali; Blue Corner; Tanjung Taal; Tanjun Ental; Zuurtjeskoraal; Distochopora vervoorti; Distichopora violacea; Pedicularia vanderlandi; 42.65; 42.72.
Ano: 2004 URL: http://www.repository.naturalis.nl/record/270185
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Pedicularia vanderlandi spec. nov., a symbiotic snail (Caenogastropoda: Ovulidae) on the hydrocoral Distichopora vervoorti Cairns & Hoeksema, 1998 (Hydrozoa: Stylasteridae), from Bali, Indonesia Naturalis
Goud, J.; Hoeksema, B.W..
A new species of ovulid gastropod is described from Bali as Pedicularia vanderlandi spec. nov. It was predominantly found in shallow water on the stylasterid hydrocoral Distichopora vervoorti Cairns & Hoeksema, 1998. The snails are compared with type specimens of congeneric taxa and with material of Pedicularia pacifica Pease, 1865, which was found in shallow water on an unidentified Stylaster. Various notes on Indo Pacific Pedicularia species are given in an annotated, preliminary check-list. Finally, the host relationships of Pedicularia are discussed in general.
Tipo: Article / Letter to the editor Palavras-chave: Ovulidae; Pedicularia; Stylasteridae; Distichopora; Stylaster; Symbiotic association; Coral reefs; Bali; Sulawesi; Indonesia; 42.79.
Ano: 2001 URL: http://www.repository.naturalis.nl/record/219449
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Long-term changes in coral assemblages under natural and anthropogenic stress in Jakarta Bay (1920–2005) Naturalis
Meij, S.E.T. van der; Suharsono; Hoeksema, B.W..
Coral reefs in Jakarta Bay have been subjected to scientific studies since the 1920s. Also from that time on biological collections were made. The reefs in the Jakarta Bay have been under long-term natural and anthropogenic stress. With the biological collections and historical documents the coral species richness in Jakarta Bay around 1920 was reconstructed. New data from this bay and the adjacent offshore Thousand Islands archipelago were obtained during a 2005 research expedition. A comparison of the coral assemblages between 1920 and 2005 reveals a clear decline in species numbers. The most prominent results include the near-shore disappearance of species belonging to the families Acroporidae, Milleporidae, and to a lesser extent Poritidae. The overall...
Tipo: Article / Letter to the editor Palavras-chave: Biodiversity change; Global change; Kepulauan Seribu; Reef degradation; Scientific collections; Scleractinia.
Ano: 2010 URL: http://www.repository.naturalis.nl/record/409044
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Naar de eilanden van de Raja Ampat groep Naturalis
Hoeksema, B.W..
De laatste expeditie van het Naturalis zeeteam, waarvan melding is gemaakt in Onderwatersport, heeft plaatsgevonden in 2005. Deze expeditie ging naar de Baai van Jakarta en de Duizend Eilanden. Hoewel de verwachtingen niet hoog waren zijn er toch leuke vondsten gedaan. Al toonde een vergelijking met de Naturalis collecties ook aan dat er in de loop van zo'n 75 jaar soorten zijn verdwenen zo vlak bij Jakarta.
Tipo: Article / Letter to the editor Palavras-chave: Koraalrifonderzoek; Indo-Pacifisch gebied; Raja Ampat eilanden; 42.65.
Ano: 2007 URL: http://www.repository.naturalis.nl/record/270360
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Evolutionary trends in onshore-offshore distribution patterns of mushroom coral species (Scleractinia: Fungiidae) Naturalis
Hoeksema, B.W..
A phylogenetically based comparative analysis of onshore-offshore distribution patterns of mushroom coral species (Scleractinia: Fungiidae) was made to reconstruct an evolutionary scenario for differentiation in fungiid shelf habitats. This phyloecological study integrates data on fungiid distribution patterns along environmental gradients on the Spermonde Shelf, SW Sulawesi, with a recently published phylogeny reconstruction of the Fungiidae. A mushroom coral fauna of 34 species was used to compare their distributions by use of 50-m2 belt quadrats in transects (1) from the mainland to the shelf edge, (2) around reefs with regard to predominant wind directions, and (3) over bathymetrical reef zones. Species association ordinations were made for each of the...
Tipo: Article / Letter to the editor Palavras-chave: Competitive exclusion; Ecophylogenetics; Environmental gradients; Habitat partitioning; Niche differentiation; Phylogenetic ecology; 42.72.
Ano: 2012 URL: http://www.repository.naturalis.nl/record/433355
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Sponge interactions with spatial competitors in the Spermonde Archipelago Naturalis
Voogd, N.J. de; Becking, L.E.; Hoeksema, B.W.; Noor, A.; Soest, R.W.M. van.
This study describes the in situ effects of four bioactive sponges on their neighbours at three different locations and two depths in the Spermonde Archipelago, SW Sulawesi, Indonesia. The natural rates of interaction between the sponge species and eight possible competitive invertebrate groups were defined and quantified in circular subplots, this was repeated 25x for each of the four species and for each location and depth. Most interactions occurred with other sponges and with corals. Coral overgrowth by the four target species caused necrosis in more than 85 % of these interactions, whereas this was less than 25 % in sponge overgrowths. These results suggest that the toxins are used in spatial competition and that the concentrations of the bioactive...
Tipo: Article / Letter to the editor Palavras-chave: Spatial competition; Allelopathy; Sponge culture; Indonesia; 42.72.
Ano: 2003 URL: http://www.repository.naturalis.nl/record/268614
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Mushroom corals (Scleractinia: Fungiidae) of Madang Lagoon, northern Papua New Guinea: an annotated check-list with the description of Cantharellus jebbi spec. nov.* Naturalis
Hoeksema, B.W..
A check-list of mushroom corals (Fungiidae) is given with annotations on their distribution in Madang Lagoon, northern Papua New Guinea, Bismarck Sea. A total of 36 fungiid species is recorded from this locality, which is more than from any other studied so far. One species, Cantharellus jebbi spec, nov., is new to science. It is the only monostomatous mushroom coral species known that is entirely encrusting. It also represents the first record of a recent Cantharellus species in the IndoMalayan region.
Tipo: Article / Letter to the editor Palavras-chave: Scleractinia; Fungiidae; Mushroom corals; Madang; Papua New Guinea; Bismarck Sea; Distribution; New species; 42.72.
Ano: 1993 URL: http://www.repository.naturalis.nl/record/319370
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Het mysterie van de hellevuur zeeanemoon Naturalis
Hoeksema, B.W..
In 'Met Naturalis in zee' van mei 2004 komt brandgevaar onderwater aan de orde. Aanleiding is een onderzoek aan brandkoralen, in het Engels 'fire corals' genoemd. Duikers en snorkelaars leren deze Millepora koralen snel herkennen na onbedoeld contact met het koraaloppervlak. Uit kleine poriën in dat gladde opppervlak steken haarfijne tentakels die netelkapsels bevatten. Daar brandt iemand zich meestal geen tweede keer aan. Dat kan heel anders bij dieren die zo goed gecamoufleerd zijn en zo venijnig pijn doen, dat het slachtoffer zich vaak niet realiseert wat hem is overkomen en ook niet direct ziet wie de boosdoener is.
Tipo: Article / Letter to the editor Palavras-chave: Millepora; Brandkoraal; 42.72.
Ano: 2007 URL: http://www.repository.naturalis.nl/record/270359
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Habitat preferences of coral-associated wentletrap snails (Gastropoda: Epitoniidae) Naturalis
Gittenberger, A.; Hoeksema, B.W..
Examination of about 60,000 scleractinian corals of the families Dendrophylliidae, Euphylliidae and Fungiidae for the presence of associated wentletrap snails (Gastropoda: Epitoniidae) revealed various ectoparasitic life history strategies. Twenty Indo-Pacific wentletrap species were found, which were either host-specific or generalist. Most species were associated with mushroom corals, especially free-living species belonging to the Fungiidae. Snails showed different preferences with regard to their position relative to mushroom corals, the host’s size and its substrate. No preferences for depth were found. Infestation rates of mushroom corals in multi-species assemblages were negatively correlated with coral densities, which indicates that epitoniid...
Tipo: Article / Letter to the editor Palavras-chave: Coral-mollusc associations; Fungiidae; Indo-Pacific; Parasitic snails; Scleractinia; 42.73.
Ano: 2013 URL: http://www.repository.naturalis.nl/record/436822
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The hydrocoral genus Millepora (Hydrozoa: Capitata: Milleporidae) in Indonesia Naturalis
Razak, T.B.; Hoeksema, B.W..
This revision of Indonesian Millepora species is based on the morphology of museum specimens and photographed specimens in the field. Based on the use of pore characters and overall skeleton growth forms, which are normally used for the classification of Millepora, the present study concludes that six of seven Indo-Pacific species appear to occur in Indonesia, viz., M. dichotoma Forskål, 1775, M. exaesa Forskål, 1775, M. platyphylla Hemprich & Ehrenberg, 1834, M. intricata Milne-Edwards, 1857 (including M. intricata forma murrayi Quelch, 1884), M. tenera Boschma, 1949, and M. boschmai de Weerdt & Glynn, 1991, which so far was considered an East Pacific endemic. Of the 13 species previously reported from the Indo-Pacific, six were synonymized. M....
Tipo: Article / Letter to the editor Palavras-chave: Taxonomic revision; Millepora; Indonesia; New records; M. boschmai; 42.79.
Ano: 2003 URL: http://www.repository.naturalis.nl/record/220318
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New observations on scleractinian corals from Indonesia: 2. Sipunculan-associated species belonging to the genera Heterocyathus and Heteropsammia Naturalis
Hoeksema, B.W.; Best, M.B..
Three Indonesian species of Heterocyathus and two of Heteropsammia are briefly diagnosed. Remarks are given on their synonymy, phenotypic variation, and ecology. All five species are found on soft substrata in the proximity of coral reefs and live in association with a sipunculan worm. This interspecific assocation is discussed with regard to whether it is mutualistic or parasitic.
Tipo: Article / Letter to the editor Palavras-chave: Scleractinia; Free-living reef corals; Mutualism; Parasitism; Sipunculan worm; Indonesia; 42.72.
Ano: 1991 URL: http://www.repository.naturalis.nl/record/317921
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Some misapplied nomina nova in reef coral taxonomy (Scleractinia) Naturalis
Hoeksema, B.W..
Nomina nova should be used only to denote replacement names for preoccupied names, i.e. in the case of homonymy. Three examples of incorrect applications of nomina nova in scleractinian taxonomy are given. Coincidentally, in the cases discussed each wrongly proposed nomen novum concerns a new species so that there are no nomenclatorial consequences. For one of these species, Galaxea paucisepta Claereboudt, 1990, a lectotype is designated.
Tipo: Article / Letter to the editor Palavras-chave: Nomen novum; Reef corals; Scleractinia; Misapplication; 42.72.
Ano: 1993 URL: http://www.repository.naturalis.nl/record/318375
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Oost-Kalimantan: de zoutwatermeren van Berau Naturalis
Hoeksema, B.W..
In het oktobernummer van Onderwatersport (2004) is een inleiding gepresenteerd over de Nederlandse expeditie naar Oost-Kalimantan (Indonesië), die in oktober 2003 plaats vond. Dit tweede artikel over die expeditie gaat over de zoutwatermeren die toen werden onderzocht.
Tipo: Article / Letter to the editor Palavras-chave: Koraalrifonderzoek; Indo-Pacifisch gebied; Oost-Kalimantan; Berau; Zoutwatermeren; 42.65.
Ano: 2005 URL: http://www.repository.naturalis.nl/record/270214
Registros recuperados: 68
Primeira ... 1234 ... Última
 

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