. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY AND POPULATION BIOLOGY 295 11 n 0 C/5 7 - - 5 H MO CHILDS RIVER Pred 515N Seston Sediment 60 d 93d 12 18 Day 24 30 SAGE LOT POND B. 9 i 6 - 2 "o 03^ 'o 3 - O A x X 1:1 8 AA O CR SLP Sediment • O Seston ^ ^ Growth (mm) Day CR SLP Mortality CR SLP 3 ± ± 0 0 6 ± ± 0 0 12 ± ± 10 0 24 ± ± 20 0 01234567 515N food source (%o) Figure 1. (A. B) b'5N signature of tissue from scallops grown in Childs River (A) and Sage Lot Pond (B) vs. time. CR regression: y
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY AND POPULATION BIOLOGY 295 11 n 0 C/5 7 - - 5 H MO CHILDS RIVER Pred 515N Seston Sediment 60 d 93d 12 18 Day 24 30 SAGE LOT POND B. 9 i 6 - 2 "o 03^ 'o 3 - O A x X 1:1 8 AA O CR SLP Sediment • O Seston ^ ^ Growth (mm) Day CR SLP Mortality CR SLP 3 ± ± 0 0 6 ± ± 0 0 12 ± ± 10 0 24 ± ± 20 0 01234567 515N food source (%o) Figure 1. (A. B) b'5N signature of tissue from scallops grown in Childs River (A) and Sage Lot Pond (B) vs. time. CR regression: y = \ + , F = ns. SLP regression: y = ~\ + , F = *. Predicted 8'5/v" signature lines for tissue are derived from mean seston and sediment signatures, +3% to correct for trophic shift. The lines represent predicted ultimate tissue signatures for scallops assuming exclusive consumption of either food source. (C) Sj:iN signature of scallop ejecta (feces + pseudofeces) is generally heavier than that of food sources (seston and sediment). (D) Mean (± std. error) scallop growth (measured as cumulative change in shell length) and mortality over time, in each study estuary. Mean growth was calculated using a subsampling of the individuals in the cage fn = 10). it difficult, however, to determine which food source contributed most to the diet of scallops during this study. The faster rate at which SLP scallops approached predicted 815N signatures of their food sources (Fig. 1A, B) may be related to the faster growth of scallops in SLP (Fig. ID). SLP scallops grew more quickly and achieved greater length than CR scallops (Fig. ID). Mean growth rates (from incremental growth data) are ± mm/day for SLP. and ± mm/day for CR. In addition, no scallops in SLP died during the study, whereas those in CR reached 20% mortality by day 24 (Fig. ID). The data suggest that conditions in CR were less favorable for scallops than conditions i
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
