Summary
The abundance, biomass, sexual and size composition of a population of Rivulogammarus fossarum Koch on a stony and sandy substrate of a small fishless stream was determined.
The stony biotope was more productive than the sand biotope, the mean abundance on stones being 1,080 Im2, on sand 509 Im2, the biomass on stones was 6.8 g/m2, on sand 1.6 g/m2.
Males occurred in larger quantities than females (total). Females with embryos dominated significantly in summer. The difference of the male to female (total) ratio on stone and sand could not be statistically proved. The ratio of sexually differentiated individuals to juvenils was suggested to be 2 : 1 on a stony bottom and 1 : 1 on a sandy one.
The mean size on a stone biotope has found to be for males 5.2 mm, for females (total) 5.3 mm and for juvenils 2.5 mm. On a sand biotope : for males 4.5 mm, for females (total) 5.0 mm and for juvenils 2.4 mm. The percentual portion of individuals of 6 mm in length and more seemed to be higher on the stony substrate.
Zusammenfassung
Es wurde das Abundanz, die Biomasse, die Sexual- und Grössen-struktur der Population des Rivulogammarus fossarum Koch am Gestein- und Sandsubstrat eines kleinen fischlosen Baches verfolgt.
Die Produktivität war am Gesteinbiotop reicher als am Sand-biotop, dat mittlere Abundanz am Gestein betrug 1,080 m2, am Sand 509 m2. Die Biomasse betrug am Gestein 6,8 g/m2, und am Sand 1,6 g/m2.
Die Männchen waren in grösseren Mengen als Weibchen (Gesamtzahl) vorhanden. Die Weibchen mit Embryos zeigten sich sehr intensiv im Sommer. Es wurde kein statistisch signifikanter Unterschied zwischen dem Verhältnis der Männchen zu den Weibchen (Gesamtzahl) am Gestein und am Sand festgestellt. Das Verhältnis zwischen den geschlechtlich differenzierten und juvenilen Exemplaren betrug am Steinbett 2 : 1, am Sandbett dagegen 1 : 1.
Die Mittelgrösse der Exemplare am Steinbiotop ergab sich nachfolgend: Männchen 5,2 mm, Weibchen (Gesamtzahl) 5,3 mm, Juvenile 2,5 mm; am Sandbiotop: Männchen 4,6 mm, Weibchen (Gesamtzahl) 5,0 mm, juvenile 2,4 mm.
Der Prozentsatz der 6 mm langen und längeren Exemplare war am Gesteinsubstrat grösser als am Sandsubstrat.
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Faculty of Natural Science, University of Brno
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OBrdlík, P. A population of Rivulogammarus fossarum Koch (Amphipoda) in a Small Fishless Stream. Hydrobiologia 40, 279–295 (1972). https://doi.org/10.1007/BF00016798
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DOI: https://doi.org/10.1007/BF00016798