On the relation between the plankton and the salinity of the waters in the Hokuriku district, Japan
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The writer has made a limnological investigation of five lakes and the rivers connecting with them in the Hokuriku district, with special reference to the relation between the salinity of the waters and the plankton species found there. The results obtained are as follows : <BR>1. Forms of the waters<BR>A. Lakes<BR>1) Kahoku-gata…Mesohaline water<BR>2) Kita-gata…Fresh water-polyhaline water<BR>3) Imae-gata…Oligohaline water<BR>4) Kiba-gata (south-west) Shibayama-gata…Fresh water<BR>B. Rivers a. Kakehashi-gawa<BR>1) at Sumiyoshi-bashi…α Mesohaline water<BR>2) at Shiodome-bashi at Mukaimotoori-shinbashi…Oligohaline water b. Kushi-gawa<BR>3) Muramatsu-cho…Fresh water-oligohaline water c. Shinhori-kawa<BR>4) at Genpei-bashi at Shiodome-suimon…Fresh water<BR>2. Plankton<BR>The plankton consist of 151 species, 20 Rotifera, 2 Cladocera, 6 Copepoda, 1 Bryozoa, 13 Protozoa, 31 Chlorophyceae, 3 Chyanophyceae and 75 Diatomaceae.<BR>The dominant and subdominant species occurring in this district are <I>Sinocalanus tenellus, Paracyclopina nana, Pseudodiaptomus inopinus, Diaphanosoma brachyurum, Thermocyclops taihokuensis, Bosminopsis deitersi, Keratella valga, Brachionus calyciflorus</I> var. <I>dorcas</I> and <I>Ceratium hirundinella</I>.<BR>Generally speaking, the plankton fauna in these waters, are divided into two groups according to the main representatives. One consists of <I>Paracyclopina nana</I> and <I>Sinocalanus tenellus</I> in L. Kahoku-gata and L. Kita-gata, both of which have the water of high salinity, and the other is represented by <I>Diaphanosoma brachyurum, Bosminopsis deitersi</I> and <I>Thermocyclops taihokuensis</I> in the water of low salinity, such as, L. Kiba-gata, L. Imae-gata and L. Shibayama-gata.<BR>As seen from the tables the zooplankton in the waters in question are richer in quantity than the scanty, phytoplankton, thongh the latter is rich in the number of species.<BR>Among the phytoplankton, <I>Merismopedia</I> sp., <I>Anabaena</I> sp., <I>Pediastrum tetras, Ankistrodesmus falcatus</I> var. <I>mirabilis, Schroederia setigera, Scenedesmus dimorphus, S. denticulatus, S. longispina, S. maximus, Actinastrum</I> sp., and <I>Coelastrum sphaericum</I> seem to adapt to brackish water.<BR>The diatoms are widely distributed in this district. The representative species found at Yoshizaki of L. Kita-gata is <I>Melosira octogona</I> and that at the Shiodome-bashi of the Kakehashi-gawa River is <I>Nitzschia obtusa</I> and <I>N. obtusa</I> var. <I>scalpelliformis</I>; that at Katayamazu by L. Shibayam-agata is <I>Melosira varians</I>. None of representative species is found in the other stations.
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