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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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