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  • 1
    Electronic Resource
    Electronic Resource
    Spatial and temporal distribution of Myrophis punctatus (Ophichthidae) and associated fish fauna in a northern Brazilian intertidal mangrove forest (2000)
    Springer
    Hydrobiologia 426 (2000), S. 65-74 
    Details
    ISSN: 1573-5117
    Keywords: Myrophis punctatus ; Ophichthidae ; ichthyotoxics ; Ichthyotere cunabi ; mangrove forest ; macrotidal region ; estuarine habitat ; Caeté Estuary ; East Amazon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The mangrove forest along the northern Brazilian coast is not inundated during low tide. However, many fish species stay in the mangrove forest during this time. Tidal behaviour strategies are described for fish species that linger in the mangrove forest during low tide. The samples were taken at the end of the dry season (December 1996) and at the end of the rainy season (July 1997). Fish were captured using an ichthyotoxic plant extract (Ichthyotere cunabi). Spatial and temporal fish density and biomass were analyzed statistically. Thirty-six samples were taken with a total density of 2.8 ind m-2 and a total biomass of 17.4 g m-2 distributed among seven families and 14 species. Myrophis punctatus was the most important species in number (1.66 ind m-2) and weight (12.68 g m-2) of all catches. The total fish densities were not significantly different among areas and between months, although, total biomass differed significantly in time and space. The densities and biomass for the three most dominant species (M. punctatus, Poecilia spp. and Gobionellus smaragdus) differed significantly among species. Only the biomass of these species showed significant monthly differences. The only significant main effect on variance in the densities and biomass of M. punctatus were encountered between months. In addition, the factor area was significantly different for the variable number of species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003939000270
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  • 2
    Electronic Resource
    Electronic Resource
    Scent-Marking in the Eurasian Beaver (Castor fiber) as a Means of Territory Defense (1998)
    Springer
    Journal of chemical ecology 24 (1998), S. 207-219 
    Details
    ISSN: 1573-1561
    Keywords: Beaver ; Castor fiber ; Castor canadensis ; castoreum ; anal gland secretion ; scent mound ; scent-marking ; territorial behavior ; Norway
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Beaver (Castor spp.) normally scent-mark by depositing castoreum and/or anal gland secretion on scent mounds close to the water's edge. The aim of this study was to investigate the hypothesis that the Eurasian beaver (C. fiber) scent-marks as a means of territory defense. Scent-marking behavior was studied during an entire year (April 1, 1995–March 31, 1996) in seven adjacent territories along 9.2 km of the BΦ River in Telemark County, Norway. The number and location of fresh scent marks were recorded biweekly. The main results showed that: (1) the number of scent marks in territories was significantly higher in spring, when dispersal of subadults normally occurs than during the rest of the year; (2) the number of scent marks was clumped near territorial borders; and (3) the number of scent marks was significantly greater upstream than downstream of the lodge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022524223435
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    Paper (German National Licenses)
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