Bibliothek

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Chemistry  (2)
  • biogeography  (2)
  • population growth  (2)
Datenquelle
Materialart
Erscheinungszeitraum
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Demography and population growth of Asplanchna girodi (Rotifera) as a function of prey (Anuraeopsis fissa) density (1995)
    Springer
    Hydrobiologia 306 (1995), S. 97-107 
    Details
    ISSN: 1573-5117
    Schlagwort(e): prey-predator interaction ; population growth ; mortality ; rotifers
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Laboratory studies on population growth and life table demography of Asplanchna girodi were conducted at 25±1 °c using Anuraeopsis fissa as prey at four (250, 500, 1000 and 2000 ind ml−1) densities. A prey density of 100 ind ml−1 per predator per day did not support A. girodi, while at the highest prey concentration, A. girodi reached a peak of 115±7 ind ml−1. The age distribution of A. girodi indicated that non-adults constituted about 2/3rd of the population at all prey concentrations. A decrease in prey availability resulted in increased mortality of non-adults. At the highest prey density, the rate of population increase (r) was 1.51 d−1. The significance of estimating mortality in population growth studies is discussed. Life table demography of A. girodi was also studied using the same prey at the same concentrations. None of the survivorship parameters (e.g. mean lifespan and mean survivorship) showed a significant relation to prey density. Net reproductive rate and generation time (but not rate of population increase) were affected by prey abundance.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00016827
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Rotifera, Cladocera, Copepoda, and Ostracoda from coastal wetlands in northeast Algeria (1998)
    Springer
    Hydrobiologia 386 (1998), S. 183-193 
    Details
    ISSN: 1573-5117
    Schlagwort(e): freshwater zooplankton ; wetlands ; Algeria ; biogeography ; Afrotropical relict fauna
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Two wetland complexes in the El Kala area, northeast Algeria, were sampled for zooplankton over a two-month period (mid-May to mid-July 1993). Some samples from 1976 and 1978 were also studied. A total of 98 taxa (51 species of Microcrustacea and 47 species of Rotifera) are recorded. Twenty-seven of these (26.5% overall) are new to Algeria and/or to the Maghreb and Africa. A significant fraction of Afrotropical species was found in all four groups, beside species of northern (European) origin, and at least one cyclopoid copepod with an Irano-Turanian range. These results confirm the El Kala wetlands as an important relict pocket of species of various historical and geographical origin, and highlight the urgency of safeguarding these sites.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1003538730152
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Feeding preference and population growth of Asplanchna brightwelli (Rotifera) offered two non-evasive prey rotifers (1997)
    Springer
    Hydrobiologia 361 (1997), S. 77-88 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Rotifer ; biomass ; predation ; population growth ; handlingtime
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Population growth rates of the predatory rotifer Asplanchna brightwelli were determined at 25 °C using a large (Brachionus calyciflorus) and a small (Anuraeopsis fissa) rotifer prey species in three concentrations (0.5, 0.1 and 2.0 μg dry weight ml-1) and in five combinations. The prey ingestion time by the predator was also measured. For B. calyciflorus the ingestion time (22.97–8.95 s) was more than six times that of A. fissa (3.68 ± 0.93). Regardless of prey type, the population growth of Asplanchna increased with increasing food density. There was a direct correlation between densities of amictic and mictic fernales. The maximum rate of population growth (1.01 ± 0.10 d-1) was higher at high density of A. fissa prey than that at the same density of B. calyciflorus. Progressive increase of A. fissa density in the offered food combination resulted in a corresponding increase of the predator's number. Gut content analysis of A. brightwelli revealed that the number of prey ingested increased with increasing prey densities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1003189312452
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    Faunal composition and biogeography of the calanoid copepods of West-Darfur, Sudan, with the description of Tropodiaptomus asimi n. sp. (1989)
    Springer
    Hydrobiologia 179 (1989), S. 195-203 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Diaptomids ; Tropodiaptomus ; Sudan ; Africa ; biogeography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Four calanoid species found in Darfur, Western Sudan, all belong to previously known Nile Valley elements, but had not been reported from its Western sector. One species is morphologically characterized and given a new name. Another had been found on the East African Plateau and in the Chad basin only. It is now recorded from an intermediate locality as well.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00006632
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Zur Kenntnis der Cumaron-Gruppe (1909)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 42 (1909), S. 911-915 
    Details
    ISSN: 0365-9496
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.190904201149
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 6
    Digitale Medien
    Digitale Medien
    Zur Kenntnis des 1.3-Dimethoxy-cumaranons (1910)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 43 (1910), S. 1969-1971 
    Details
    ISSN: 0365-9496
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.191004302134
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...