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Sago Pondweed (Potamogeton pectinatus L.): A Literature Review

Table 2

Table 2. Density and yield (dry wt)a of sago pondweed (Potamogeton pectinatus L.) propagules under various conditions.

      Turions                 Drupelets
Density     Yield       Density     Yield
(no./m²)    (g/m²)     (no./m²)     (g/m²)            Conditions                      Reference
   387                   1,960                    After dewatering and 
                                                      carp removal                        1
 1,033       21.5                                 Waterfowl and carp present              2
 4,909      102                                   Waterfowl and carp excluded             2
    92        4.0                                 Clay loam substrates                    2
    59        1.2                                 Silt substrates                         2
    12        0.2                                 Sand substrates                         2
                         1,615       2.9          Salinity 0.84-1.9 g/L                   2
                           few                    Salinity 7.2-8.25 g/L                   2
                         2,180       4.0          Depth 41-46 cm                          2
                           403       0.73         Depth <8 cm                             2
   464                                            Open to waterfowl                       3
   688                                            Waterfowl excluded                      3
 2,390      450                                   Open to waterfowl                       4  
   192                                            Mesotrophic                             5
   100                                            Eutrophic                               5
    48                                            Eutrophic, polluted                     5
    52                                            Eutrophic, unpolluted                   5
     8                                            Hypereutrophic                          5
   115                     181                    Exposed sands                           6
    45                     455                    Sheltered muds                          6
              6.4                    0.85         Carp excluded                           7
   few                               7.2          Turbid, carp present                    8
            103                                   Waterfowl excluded                      9
             44                                   Open to waterfowl                       9
   629       60            302       1.2          Sheltered, brackish                    10
   337       22                      0.04         Exposed, brackish                      10
   440       11             20       0.11         Exposed, fresh                         10
   888       37                      0.07         Exposed, fresh-slightly brackish,      10
                                                     open to waterfowl
 1,784      110            363        5.3         Exposed, fresh-slightly brackish       10
                                                    closed to waterfowl
   759       13              0        0           Fresh running water                    10
   750        7              0        0           Fresh running water                    10
             69                                   Fresh running water                    11
 3,975      200            651        2.9         Oligosaline, rising summer water       10
                                                   levels, sheltered
 1,330       86            806        3.4         Oligosaline, falling summer water      10
                                                     levels, sheltered
   467       28          1,019        5.8         Oligosaline, 30-45 cm depth,           10
                                                     much wave action
   495       22          3,707       20.4         Oligosaline, 40-70 cm depth,           10
                                                       moderate wave action

^aFresh (wet) weight yields were multiplied by 0.13 to obtain dry weight; data from Van Wijk (1988) were used to convert ash-free dry weight yields for turions and drupelets to dry weight by multiplying by 1.12 and 1.16, respectively.
^b1 = Lutz 1960; 2 = Craner 1964; 3 = Jupp and Spence 1977b; 4 = Jarvis et al. 1985; 5 = 0zimek et al. 1986; 6 = Kautsky 1987; 7 = Sterlin~ 1970; 8 = Rich 1966; 9 = Anderson and Low 1976; 10 = Van Wijk 1988; 11 = Madsen 1986.

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