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  • 1
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    Vestiging van bijzondere plantesoorten in het infiltratiegebied van de Amsterdamse Waterleidingduinen (1986)
    In:  Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland vol. 13 no. 1, pp. 3-11
    Details
    Publikationsdatum: 2024-04-02
    Beschreibung: The ‘Amsterdamse Waterleidingduinen’ is a dune area near Haarlem in the calcareous Dune district. Since 1851 it is the water catchment area of Amsterdam. Due to the lowering of the groundwater level the moist dune slacks have disappeared gradually. Since 1957 infiltration of water from the river Rhine takes place for the water supply of Amsterdam. This water, rich in nutrients, causes among others a ruderal vegetation of high forbs and poor in species instead of the former species-rich dune slack vegetation. Since about 1970 locally a divergent vegetation is developing. In the so-called Groot Zwarteveld not only dune slack species have established, but also a number of species characteristic for dunes poor in lime and nutrients: Empetrum nigrum, Erica tetralix, Dryopteris cristata, Osmunda regalis and some Sphagnum species. The most remarkable species is Sphagnum imbricatum, which has been refound in the Netherlands after a long period of (seeming?) absence. It was its first observation in the Dune district. The species mentioned were not known from this dune area in former times. This vegetation development is a result of the new habitat. Firstly this dune area is superficially decalcified, stimulated by former agricultural management owing to which the humus content of the soil has increased. Secondly a layer of nutrient-poor rainwater has been formed on the nutrient-rich riverwater. This is caused by the very slow water movement in this area (without drains) and also by the small groundwater fluctuations (contrarily to most other places with a rapid water movement through the soil and great fluctuations in the groundwater). An important fact is that the vegetation is mown annually since 1974. A similar vegetation development takes place in other parts of the Amsterdamse Waterleidingduinen where similar habitats have originated.
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
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  • 2
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    Naamlijst van de flora van Nederland en Belgi\xc3\xab (1986)
    In:  Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland vol. 13 no. 5/6, pp. 87-170
    Details
    Publikationsdatum: 2024-02-08
    Beschreibung: Bij het verschijnen van soortenlijsten als voorliggende \xe2\x80\x98Naamlijst van de flora van Nederland en Belgi\xc3\xab\xe2\x80\x99 is het gebruikelijk dat over de totstandkoming ervan bericht wordt. Op deze regel zal hier geen uitzondering worden gemaakt, omdat het de lezer wellicht zal boeien om te vernemen waarom nu reeds, zo kort na het verschijnen van de \xe2\x80\x98Naamlijst van de Nederlandse plantesoorten\xe2\x80\x99\xc2\xb9, het al weer nodig bleek om een nieuwe lijst uit te geven. We zijn er ons van bewust dat de recentelijk reeds aangeslagen stabiliteit van de Nederlandse namen, die tot voor kort groter was dan die van de wetenschappelijke namen, hierbij opnieuw in het gedrang komt. Omwille van de hieronder geschetste redenen leek het ons nochtans zinvol, en beter vroeg dan laat, nieuwe hervormingen door te voeren, zij het ditmaal gedragen door drie flora\xe2\x80\x99s waarvan bekend is dat ze binnen beide landen een verregaande impact hebben.\nDoor oplettende, nauwgezette floristen werd sedert 1983 herhaaldelijk gewezen op het bestaan van verschillen in de Nederlandse namen tussen de toonaangevende flora\xe2\x80\x99s van Nederland\xc2\xb9 en Belgi\xc3\xab\xc2\xb3. Terecht wekten de vastgestelde verschillen wrevel op en werden ze als verwarrend ondergaan. Voor de neutrale floragebruiker, die zich de moeite getroost om meer dan \xc3\xa9\xc3\xa9n flora na te kijken, is het vinden van verschillende namen voor eenzelfde soort eerder een straf dan een beloning. Onvermijdelijk doken hierbij dan ook telkens vragen op naar de juistheid van de respectievelijke namen.
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
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  • 3
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    Nieuwe vondsten van zeldzame planten\'in Nederland in 1984 (1986)
    In:  Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland vol. 13 no. 3/4, pp. 51-65
    Details
    Publikationsdatum: 2024-02-08
    Beschreibung: In the list of new records of rare species the categories \xe2\x80\x98adventitious species\xe2\x80\x99 and \xe2\x80\x98species escaped from cultivation\xe2\x80\x99 are no longer kept separate from the Dutch species. Species which are purposedly introduced as seeds (for oil or birds) or fruit (for human consumption) are no longer regarded as adventitious and are not mentioned any more in the list. Only true adventitious species are mentioned when at least ten localities are known within the last 15 years. The same holds true for species escaped from cultivation. Interesting new records are mentioned of Lycopodium tristachyum and L. annotinum, of various ferns in the IJsselmeerpolders, of Herminium monorchis. Orchis morio and Schoenus nigricans; Apium repens is not yet extinct; new records of Eriophorum gracile, Campanula glomerata and Viola persicifolia are mentioned; and Carex lepidocarpa, once found in 1912, has been rediscovered.
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
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  • 4
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    The recent species of Megabalanus (Cirripedia: Balanomorpha) with special emphasis on Balanus Tintinnabulum (Linnaeus) Sensu Lato (1986)
    In:  Zoologische Verhandelingen vol. 235 no. 1, pp. 1-60
    Details
    Publikationsdatum: 2024-02-08
    Beschreibung: Since Darwin\'s (1854) description of 11 varieties of Megabalanus tintinnabulum (Linnaeus) [as Balanus tintinnabulum], 26 Recent taxa have been assigned to the genus. In this review, two taxa confounded by Darwin are reestablished [i.e., M. crispatus (Schroter) and M. dorbignii (Chenu)].\nM. antillensis (Pilsbry) and M. intermedius (Darwin) are placed in synonymy with M. tintinnabulum sensu stricto. M. galapaganus (Pilsbry) is synonymized with M. peninsularis (Pilsbry) and M. xishaensis Xianqui & Liu is considered a synonym of M. occator. Diagnoses and an illustrated key to the species are presented. Lectotypes are designated for M. tintinnabulum, M. crispatus, M. dorbignii, M. coccopoma (Darwin), M. spinosus (Chenu), M. validus (Darwin), and M. ajax (Darwin).
    Schlagwort(e): Crustacea; Cirripedia; Balanomorpha; Megabalanus; key ; species.
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
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  • 5
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    The taxonomy and biogeography of the Conviva group of the genus Baeturia St\xc3\xa5l, 1866 (Homoptera, Tibicinidae) (1986)
    In:  Beaufortia vol. 36 no. 7, pp. 167-182
    Details
    Publikationsdatum: 2024-01-12
    Beschreibung: The name conviva group is proposed for a group of five species of the genus Baeturia St\xc3\xa5l, 1866, from the Moluccas and the Vogelkop peninsula (= Tjendrawasih), New Guinea. The monophyletic origin of this group is made plausible. Three of the species (B. conviva, B. quadrifida and B. schulzi) are redescribed, while two (B. laureli and B. hardyi) are described as new. For B. schulzi a lectotype is designated. B. hirsuta Bl\xc3\xb6te, 1960 is brought into the synonymy of B. quadrifida Walker, 1868. A key to the males and a map of the distributions are presented. Biogeographical data of this group suggest an Outer Melanesian Arc distribution.
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
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  • 6
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    Ecology of the Long-tailed Skua, Stercorarius longicaudus, at Scoresby Sund, East Greenland. Part four: Breeding success and growth of young (1986)
    In:  Bijdragen tot de dierkunde vol. 56 no. 1, pp. 1-23
    Details
    Publikationsdatum: 2024-01-12
    Beschreibung: Breeding success and growth of young of Long-tailed Skuas were investigated in Northeast Greenland at Kap Stewart in 1973 and 1974, at Ugleelv and K\xc3\xa6relv in 1975, and at K\xc3\xa6relv in 1979. Territorial pair density was positively correlated with the percentage snow-free area in June. In 1973, estimated mean egg production per territorial pair was 1.4, but no young hatched. Egg loss was due to predation by Arctic Foxes, Alopex lagopus. In 1974 no eggs were produced due to scarcity of food on the tundra. In 1975 and 1979, estimated mean egg production per territorial pair was 1.2 and 1.9, respectively, and young did hatch, but none of them fledged. In both these years two-thirds of overall egg and chick mortality was caused by Arctic Foxes. Survival time of clutches and young in the different breeding years was negatively correlated with the number of foxes per unit of snow-free area. High breeding success of Long-tailed Skuas in Northeast Greenland occurs only in years with moderate to high food availability, a relatively low number of foxes and early to rather early disappearance of snow cover. Chicks gained weight rapidly from the first day to 12 or 13 days after hatching, when fast growth of culmen and tarsus stopped, and growth of wing slowed down. During the first two weeks in 1975 first-hatched chicks were heavier than second-hatched chicks of the same age and single chicks were similar to first-hatched chicks. The two longest surviving chicks reached an age of 24 and 25 days, at which time they had not yet fledged. Chicks and parents showed a circadian rhythm with greatest activity during the day and a period of sleep during the night in which the sun does not set at this latitude. The female stayed closer to the young than the male, but the male provided food more frequently.
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
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  • 7
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    Notes on the distribution and phylogenetic significance of post-cloacal sacs and bones as occurring in the Gekkota (Reptilia) (1986)
    In:  Bijdragen tot de dierkunde vol. 56 no. 2, pp. 214-220
    Details
    Publikationsdatum: 2024-01-12
    Beschreibung: On the basis of Kluge\xe2\x80\x99s (1982) paper on post-cloacal sacs and bones in the Gekkota the following matters are presented: (1) the situation in the gekkonid genera Microscalabotes and Paragehyra is recorded, (2) the situation in the gekkonid genus Lygodactylus is extensively reviewed and commented upon, (3) the post-cloacal sac variability in the gekkonid genus Thecadactylus, first noted by Hoogmoed (1973) and evidently overlooked by Kluge, is confirmed and commented upon, (4) Kluge\xe2\x80\x99s interpretation of the phylogenetic significance of post-cloacal sacs is discussed.
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
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  • 8
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    Amsterdam Expeditions to the West Indian Islands, Report 50. Naididae (Oligochaeta) from subterranean waters of West Indian Islands \xe2\x80\x93 distribution, taxonomic remarks and description of a new species (1986)
    In:  Bijdragen tot de dierkunde vol. 56 no. 2, pp. 267-281
    Details
    Publikationsdatum: 2024-01-12
    Beschreibung: Fourteen species of the family Naididae from various subterranean habitats are recorded. Taxonomic remarks concerning variations in setation are provided. The structure of the genital organs of some species is described. A new species of the genus Dero is described.
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
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  • 9
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    The species of the genus Pseudoniphargus Chevreux, 1901 (Amphipoda) from northern Spain (1986)
    In:  Bijdragen tot de dierkunde vol. 56 no. 1, pp. 75-122
    Details
    Publikationsdatum: 2024-01-12
    Beschreibung: Based on new material collected in 1983, 1984, and 1985, the genus Pseudoniphargus proves to be distributed in northern Spain from Asturias, in the western part of the Cordillera Cantabrica, to Navarra and Huesca, in the headlands of the Pyrenees; and from coastal Atlantic regions up to the northern border of the Meseta. A total of 13 species are recognized, of which 11 are new. They are not only found in cave waters, but also in springs, hyporheic habitats, and wells.\nThe species are allopatric in distribution; burgensis n. sp., eborarius n. sp., unisexualis Stock, 1980, and spiniferus n. sp. are known from single localities only; jereanus n. sp., gorbeanus n. sp., vasconiensis n. sp., incantatus n. sp., and guernicae n. sp. have more or less small distribution ranges; longicarpus n. sp., semielongatus n. sp., and montanus n. sp. are distributed in the underflows of some adjacent rivers; and finally elongatus Stock, 1980 has a large distribution, particularly in caves.\nMorphological differences between the species are in general small, characters considered of major diagnostic importance are found in gnathopod 2, coxal plates, basis and claws of pereiopods 5 to 7, uropod 3, and telson.
    Repository-Name: National Museum of Natural History, Netherlands
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  • 10
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    Pteridophyta (1962)
    In:  Flora of the Netherlands Antilles vol. 1 no. 1, pp. 1-84
    Details
    Publikationsdatum: 2024-01-12
    Beschreibung: Epiphytic or usually terrestrial ferns with a short fleshy rhizome bearing only one or a few, mostly fleshy, leaves, these erect, petiolate, continuous with the rhizome, the lamina usually divided into a sterile and a stalked fertile portion; veins free or reticulate. Sporangia with a wall composed of several layers of cells, opening with a slit, containing numerous trilete thick-walled subspherical spores of one kind. Four genera, two monotypic, the others with about 60 species of almost world-wide distribution.
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
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