. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. S'5N%c 513C%<, -is - -19 o c5§ -21 1 10 100 1000 Mean prosomal width (mm) b) 11 i 9 - 7 - to 5 -. El c) -19 -17 -15 -13 §13C7oo Instar -11 Prey Category 235 6 7 8 9 1 0 1 1 Bivalves 1 1 22 20 22 1 6 1 1 1 7 Gastropods 1 4 27 24 27 20 1 3 2 1 Crustaceans/ Polychaetes 44 56 63 79 87 84 95 Benthic POM 21 <100 1 00 100 99 74 77 64 70 SuspendedPOM 100 <100 23 42 34 31 18 9 16 Figure 1. lal Change in S'^N and 8''C signatures of the horseshoe crab with increasing prosomal width. Data points correspond in lite sequence of i
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. S'5N%c 513C%<, -is - -19 o c5§ -21 1 10 100 1000 Mean prosomal width (mm) b) 11 i 9 - 7 - to 5 -. El c) -19 -17 -15 -13 §13C7oo Instar -11 Prey Category 235 6 7 8 9 1 0 1 1 Bivalves 1 1 22 20 22 1 6 1 1 1 7 Gastropods 1 4 27 24 27 20 1 3 2 1 Crustaceans/ Polychaetes 44 56 63 79 87 84 95 Benthic POM 21 <100 1 00 100 99 74 77 64 70 SuspendedPOM 100 <100 23 42 34 31 18 9 16 Figure 1. lal Change in S'^N and 8''C signatures of the horseshoe crab with increasing prosomal width. Data points correspond in lite sequence of instars; 1-3, 5-11, and nvo adult samples, respective/v. Where there is no visible standard error for the mean prosomal widths, the error is smaller than the symbol, (b) <5'5/V and S'~'C signatures of horseshoe consumers increase in size, they move up trophic steps because they seek larger prey: and larger prey characteristically show heavier signatures (4). The 8L/>. * iCs), Gammarus oceanicus (Go). Gammarus mucronatus (Cm): Isopods—Edotea triloba (El). Chiridotea coeca (Cc), Idotea baltica (Ib): Po/vehaetes—Orbinia ornata (Oo), Nean- thes succinia (Ns), Pectinaria gouldii (Pg). Ampharete spp.* (As). Eteone longa* (Ell, Nereis virens* (Nv): Benthic paniculate organic matter I POM)—sediment (sed): Suspended POM—seston (ses). An asterisk {*) indicates prey items excluded from linked diet analysis. In cases U/K/V multiple samples were pooled, signatures were averaged and error bars are shown. Circles, from left to right, signifc dietary groups: mutiny v POM. crustaceans/polychaetes. Grey lines represent expected &''C values for food webs based on macrou/gae (-17'1 fi i Estimated maximum percentage of potential prey items in the mixed diet of juvenile horseshoe crabs at Nausel Beach. Massachusetts. Percentages were calculated using a linear mixing model I?).. Please note that these images are extracted from scanned page images that may have been digitally enhanc
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
