. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 64 ANDREW C. MARINUCCI o 2 LJ O) 5£ _l O CO CD o 0) TJ I LJ ^ > O) $£ UJ 300-- 180-. 20 40 60 80 TIME (days) 100 120 FIGURE 6. Absolute (A) and relative (B) amounts of microbially produced organic matter in decomposing Spartina alterniflora litter in a percolator at 20°C. microbial nitrogen content (microbes are to N) and thus makes the most conservative estimate of microbial produced organic matter (Lipinsky and Litch- field, 1970). Absolute amounts of the microbially produced organic matter in- creased rapidly
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 64 ANDREW C. MARINUCCI o 2 LJ O) 5£ _l O CO CD o 0) TJ I LJ ^ > O) $£ UJ 300-- 180-. 20 40 60 80 TIME (days) 100 120 FIGURE 6. Absolute (A) and relative (B) amounts of microbially produced organic matter in decomposing Spartina alterniflora litter in a percolator at 20°C. microbial nitrogen content (microbes are to N) and thus makes the most conservative estimate of microbial produced organic matter (Lipinsky and Litch- field, 1970). Absolute amounts of the microbially produced organic matter in- creased rapidly in the first few days of decomposition and then became relatively constant, though there was a slight biomodal shape to the curve (Fig. 6). The amounts per gram of litter, on the other hand, increased in a nearly linear fashion throughout the experiment. The calculated microbial production in the resultant litter was 250 mg • g^1 or 25% by dry weight of detritus at the end of the experiment. The bimodal shape of both the C/N curve (Fig. 1) and the absolute amount curve (Fig. 6A) indicates a two-phased microbial enrichment of the litter which is also seen in decomposition data for other types of macrophyte litter in aquatic systems (Hunter, 1976; Andersen, 1978; Seki and Yokohama, 1978; Blackburn and Petr, 1979; Kruczynski et al., 1979) and in terrestrial systems (Howard and Howard, 1974). However, this two-phased pattern was not very pronounced in these cited works, and therefore was not discussed by these authors. The initial nitrogen enrichment during decomposition in the first 40 days was probably the result of rapid colonization by heterotrophic microbiota which ex-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Wood
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
