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  • Articles  (167,840)
  • 2020-2024
  • 1985-1989
  • 1975-1979  (167,840)
  • 1978  (167,840)
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  • 2020-2024
  • 1985-1989
  • 1975-1979  (167,840)
Year
Journal
Topic
  • 1
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    De makrofauna van enkele extreme sloottypen in Noord-Holland en Utrecht (1978)
    In:  Verslagen en Technische Gegevens vol. 17 no. 1, pp. 1-15
    Details
    Publication Date: 2024-04-02
    Description: 1. Samples of benthic invertebrate fauna were collected in – a ditch, situated in a protected area in the peaty area near the Maarsseveense plassen (prov. Utrecht), – four ditches in the neighbourhood of Castricum (N-Holland), not far from the dune district, – two ditches with water of a high chloride-content on Texel (N- Holland). 2. The faunistic results, with the additional information of some physical and chemical data on the different sampling points, made it possible to draw some conclusions concerning – the importance of the factor salinity for a faunistically oriented typology of ditches, – the importance of the group Hydracarina for a classification of ditch-biocenoses, – the influence of artificial current, caused by the inlet of water, on the invertebrate fauna of ditches and on the faunistical evaluation of the pollution-level in ditches.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 2
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    Glyptothorax stocki, a new sisorid catfish from Pakistan and Azad Kashmir (Siluriformes, Sisoridae) (1978)
    In:  Bulletin Zoologisch Museum vol. 6 no. 11, pp. 79-85
    Details
    Publication Date: 2024-02-22
    Description: A new catfish, Glyptothorax stocki, belonging to the family Sisoridae, is described and figured. The new species from Pakistan and Azad Kashmir is compared with Glyptothorax platypogonoides from Sumatra, with which it was confused.
    Repository Name: National Museum of Natural History, Netherlands
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  • 3
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    Boekbespreking (1978)
    In:  Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland vol. 9 no. 1, pp. 15-19
    Details
    Publication Date: 2024-02-08
    Description: J. T. R. KALKHOVEN, A. H. P. STUMPEL en S. E. STUMPEL-RIENKS, Landelijke Milieukartering; een landschapsecologische kartering van het natuurlijk milieu in Nederland ten behoeve van de ruimtelijke planning op nationaal niveau. Studierapport Rijksplanologische Dienst no. 8. Staatsuitgeverij, \xe2\x80\x99s-Gravenhage, 1976 (verspreid juni 1977), 141 pag. + 4 bijlagen, \xc6\x92 35,\xe2\x80\x94 (Ook verschenen als Verhandeling 9 van het Rijksinstituut voor Natuurbeheer, Leersum).
    Repository Name: National Museum of Natural History, Netherlands
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  • 4
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    Juncus effusus L.f. pauciflorus (Michel ex Lej. & Court.) Th.J. Reichgelt, een prematuur bloeiende vorm van pitrus (1978)
    In:  Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland vol. 9 no. 2, pp. 32-34
    Details
    Publication Date: 2024-02-08
    Description: Small, locally dominant plants of Juncus effusus f. pauciflorus have been collected in the exceptionally warm and dry summer of 1976 on the dry bottom of a wide ditch in the Southwestern part of the country near Roosendaal (prov. of N.-Brabant). Earlier such forms were known in the Netherlands from four localities. All the summers of the years in which these forms had been found were characterised metereologically as \xe2\x80\x9e(very) hot\xe2\x80\x9d as well as \xe2\x80\x9e(very) dry\xe2\x80\x9d, which is very unusual in this country. The individual plants have normal terete stems, sometimes with young \xe2\x80\x98lateral\xe2\x80\x99 inflorescences, as well as small, filiform stems bearing apicallya few fruits and with the lower sheaths terminating in distinct linear blades; fruits of the latter are usually not retuse at the apex, and contain apparently normal seeds ( fig. 1). Ontogenetical research on the unusual dimorphism of this form is required.
    Repository Name: National Museum of Natural History, Netherlands
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  • 5
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    On the taxonomic status of Delphinus tropicalis van Bree, 1971 (Notes on Cetacea, Delphinoidea IX) (1978)
    In:  Beaufortia vol. 28 no. 342, pp. 1-8
    Details
    Publication Date: 2024-01-12
    Description: Three recently found skulls of Delphinus tropicalis are discussed and compared with other skulls of the same taxon. The occurrence of Delphinus delphis in the same area as Delphinus tropicalis makes it plausible that D. tropicalis is a distinct species and not a subspecies of D. delphis. A dolphin collected in the South China Sea, probably near Pontianak, by W. L. Abbott in 1907 also belongs to Delphinus tropicalis. The species therefore has a wider distribution than was originally believed.
    Repository Name: National Museum of Natural History, Netherlands
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  • 6
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    Age and growth in Phocoena phocoena Linnaeus, 1758 (Cetacea, Odontoceti) from the North Sea (1978)
    In:  Bijdragen tot de dierkunde vol. 48 no. 1, pp. 16-26
    Details
    Publication Date: 2024-01-12
    Description: Data and material are collected from 106 Harbour Porpoises (P. phocoena) from the southern part of the North Sea. All animals are accidentally caught or found stranded. The greatest length for males in the sample is 151 cm, for females 186 cm. For detailed analysis of body measurements, 30 males and 37 females are selected, while from 20 males and 34 females teeth are used for age analysis. The analysis of the body measurements shows sexual dimorphism in the anterior and posterior part of the back, in the flukes and flippers and in the position of the genital slit. The maximum number of dentinal layers found in the teeth is 12. Males attain sexual maturity after the deposition of 5 dentinal layers, females when 6 layers are formed, at a body length of about 135 cm and 150 cm, respectively. Some evidence is found that the population of P. phocoena from the North Sea has a lower growth rate than the population from Canadian waters. The gestation period is estimated to be eleven months, the peak of the birth period being in June. The animals are born at a length varying between 67 cm to 80 cm. Growth of the visceral organs is isogonic. The mean weight of the organs is greater in females than in males.
    Repository Name: National Museum of Natural History, Netherlands
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  • 7
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    The neotropical mailed catfishes of the genera Lamontichthys P. de Miranda Ribeiro, 1939 and Pterosturiosma n. gen., including the description of Lamontichthys stibaros n. sp. from Ecuador (Pisces, Siluriformes, Loricariidae) (1978)
    In:  Bijdragen tot de dierkunde vol. 48 no. 1, pp. 57-80
    Details
    Publication Date: 2024-01-12
    Description: Descriptions and illustrations are given of four species of mailed catfishes belonging to the subfamily Loricariinae, tribe Harttiini. Two species are assigned to Lamontichthys P. de Miranda Ribeiro, 1939: Lamontichthys filamentosus (La Monte, 1935) (type-species, of which Harttia filamentissima C. H. Eigenmann & Allen, 1942, is provisionally considered a junior synonym), based on a total of thirteen specimens, including all type-specimens, from Brazil, Bolivia, Peru, and Ecuador (all from tributaries of the Rio Amazonas system), and Lamontichthys stibaros n. sp., based on two specimens from Ecuador, sympatric with the former species.\nHarttia microps C. H. Eigenmann & Allen, 1942, is redescribed from three out of the five type-specimens, originating from Iquitos, Peru (Rio Amazonas system). It is designated as type-species of Pterosturisoma n. gen., which superficially resembles Lamontichthys.\nSturisoma brevirostre (C. H. Eigenmann & R. S. Eigenmann, 1889), type-species of Parasturisoma A. de Miranda Ribeiro, 1911 ( = Sturisoma Swainson, 1838), which was poorly described previously, is redescribed from its unique holotype, primarily to indicate the generic distinction from both Lamontichthys and Pterosturisoma, the species of which have been recently referred to Parasturisoma.
    Repository Name: National Museum of Natural History, Netherlands
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  • 8
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    A remarkably variable phreatic amphipod from Mallorca, Rhipidogammarus variicauda n. sp., in which the third uropod can assume the \xe2\x80\x9cparviramus\xe2\x80\x9d or the \xe2\x80\x9cvariiramus\xe2\x80\x9d condition (1978)
    In:  Bijdragen tot de dierkunde vol. 48 no. 1, pp. 89-95
    Details
    Publication Date: 2024-01-12
    Description: A new species of the genus Rhipidogammarus, Rh. variicauda, is described from phreatic fresh waters of two wells in the western part of the isle of Mallorca (Mediterranean). The new species has a highly variable third uropod: about 80% of the specimens possesses a typically \xe2\x80\x9cparviramus\xe2\x80\x9d appendage, but 20% shows the \xe2\x80\x9cvariiramus\xe2\x80\x9d condition. Apparently, a classification based on the structure of the third uropod should be used with caution.
    Repository Name: National Museum of Natural History, Netherlands
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  • 9
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    Distribution and ecology of Gammarus tigrinus Sexton, 1939 and some other amphipod Crustacea near Beaufort (North Carolina, U.S.A.) (1978)
    In:  Bijdragen tot de dierkunde vol. 48 no. 1, pp. 45-56
    Details
    Publication Date: 2024-01-12
    Description: During summer 1977 the distribution and ecology of amphipod Crustacea in the coastal plain of north Carolina were studied. Ecological data were collected in particular on Gammarus tigrinus, a North American species, which has been introduced in western Europe. The present gammarid, able to endure high water temperatures and adapted to a wide variety of salinities, is found in the more upstream parts of the estuaries in North Carolina. More downstream, at higher salinities, it is replaced by Gammarus palustris, while at very low salinities or in fresh water Gammarus fasciatus is commonly met.\nMoreover, some data are given on the distribution and ecology of several other amphipod species in the Beaufort region.
    Repository Name: National Museum of Natural History, Netherlands
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  • 10
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    The estimation of the yearly cycle of submarine irradiance for ecological purposes. A methodological example based on data from Banyuls-sur-Mer (France) (1978)
    In:  Bijdragen tot de dierkunde vol. 48 no. 1, pp. 35-44
    Details
    Publication Date: 2024-01-12
    Description: The yearly cycle of surface solar irradiance at Banyuls-sur-Mer is derived from meteorological data. Monthly irradiance attenuation coefficients of the seawater were obtained from Secchi disc readings, which enabled the authors to classify the monthly optical water types according to Jerlov\'s classification. The average daily values of submarine irradiance are calculated for each month, and for different depths. Calculations have been carried out for the visible spectrum (350-710 nm) subdivided into 20 nm bands. Submarine irradiance is given in energetic (cal cm-\xc2\xb2 day-\xc2\xb9) as well as quantum (\xc2\xb5E m-\xc2\xb2 \xd1\x95-\xc2\xb9) units. Some considerations are given for underwater stations with different degrees of exposition to available light.
    Repository Name: National Museum of Natural History, Netherlands
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