. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY AND POPULATION BIOLOGY 253 Mesh opening (mm) No. of grazers/ cage SLP QR CR 1 24± ± ± 4 ± ± ± 18 ± ± ± Mean ± ± ± Mesh opening (mm) % net growth b SLP QR CR 1 ± ± ± 4 ± ± ± 18 ± ± ± Mean ± ± ± 60 -i 0) 0) to A •^ 40 - • SLP .c ^ . • QR d 20 - .'. '• ACR "Z. n . ^ — •• • m, * • •-• — A 40 80 120 No. amphipods/cage 400 -\ Q) c
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY AND POPULATION BIOLOGY 253 Mesh opening (mm) No. of grazers/ cage SLP QR CR 1 24± ± ± 4 ± ± ± 18 ± ± ± Mean ± ± ± Mesh opening (mm) % net growth b SLP QR CR 1 ± ± ± 4 ± ± ± 18 ± ± ± Mean ± ± ± 60 -i 0) 0) to A •^ 40 - • SLP .c ^ . • QR d 20 - .'. '• ACR "Z. n . ^ — •• • m, * • •-• — A 40 80 120 No. amphipods/cage 400 -\ Q) c 200 - 80 160 No. amphipods/cage 400 o 200. 0) c 0 40 No. shrimp/cage Fi|>ure 1. 77i<< effects of graying ami nitrogen load on the net growth of \J\\a lactuca HI i <a,r\ with mesh sides of 1. 4. or 18 nan in //I/IT estuaries with different land-denved nitrogen loads—Sage Lot Pond (SLP). 14 kg N lia y ; Quashnel River IQR). 350 kg N IKI~'\~'; and Childs River iCRl. fill I kg N lui''\''. (a) \itinhcr (mean ± ) of potential gra-ers (shrimp, amphipods, isopods. and i mli\i in iht- i ci^f, utter inculcation, (b) Percent net growth {mean ± of\J. lactuca fronds. Vertical line\ show mint's for which the differences in mesh opening were found to he not significant In- an ad hoc Duncan's test, (cl Niunher nt slinmp toiuul in each cage vs. amphipods per cage, id) Percent net growth vs. the number of amphipods found in each cage (SLP: F = QR: F = CR: F = .75; all F mines not significant), le) Percent net gnnvth vs. the miinher of shrimp found in each cage (SLP: F = QR: F = CR: F = ; all F VLilnes not signipcanti. growth separately versus the abundance of amphipods and shrimp. The difference in abundances of these two groups is evident in Figure le, d. and e. Despite the shift in grazer composition among the estuaries, there was no significant effect of either amphipod or shrimp number on per
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
