Patten, Bernard C.

Virginia Institute of Marine Science

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Phytoplankton diversity in the lower York River, Virginia, June 1960 -June 1961

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W&M ScholarWorks Reports 1962 Phytoplankton diversity in the lower York River, Virginia, June 1960 -June 1961 Bernard C. Patten Virginia Institute of Marine Science Follow this and additional works at: https://scholarworks.wm.edu/reports  Part of the Environmental Microbiology and Microbial Ecology Commons, Marine Biology Commons, and the Plant Sciences Commons Recommended Citation Patten, B. C., & Virginia Institute of Marine Science. (1962) Phytoplankton diversity in the lower York River, Virginia, June 1960 -June 1961. Special scientific report (Virginia Institute of Marine Science); no. 38. Virginia Institute of Marine Science, College of William and Mary. https://doi.org/10.21220/V5R307 This Report is brought to you for free and open access by W&M ScholarWorks. It has been accepted for inclusion in Reports by an authorized administrator of W&M ScholarWorks. For more information, please contact scholarworks@wm.edu. PHYTOPLANKTON DIVERSITY IN THE LOWER YORK RIVER, VIRGINIA June 1960 - June 1961 __________________________ , ____ _SPECIAL SCIENTIFIC REPORT NO. 38 VIRGINIA INSTITUTE OF MARINE SCIENCE Gloucester Point, Virginia 1962 -1-PHYTOPLANKTON DIVERSITY IN THE LOWER YORK RIVER, VIRGINIA June 1960 - June 1961 Data on phytoplankton diversity obtained in connection with 37 productivity experiments conducted in the lower York River by the Planktology Department are reported. A single station situated about 300 yards from the VIMS pier was studied. Hydrographic, nutrient, chlorophyll, seston and productivity data obtained were summarized in Report No. 22 (1961) of this series. The diversity indices employed have been fully described in Special Scientific Report No. 23 (1961), and also in J. Mar. Res. �: 57-75 (1962). The basic data for their computation were obtained from water samples collected at the beginning of each experiment from the surface, 2 ft, 6 ft, 10 ft and bottom (30 ft mean low water). Sedgwick-Rafter mounts were made of the fresh material, and phytoplankters distinguished and counted. Results were tabulated as counts (ni) per ml of each of the m taxa present m (i = i, 2, .•• ,m). If N is the total of all organisms (N = � ni), El. then the basic diversity expressions can be written as follows: 8max = log2N! - log2 [N-(m-1)] !Hmin = log2N! - m log2 (N/m)!m r H = log2N! - � log2 ni �i=l R=Hmax -HHmax - 8min -2-Computation of these variables as well as mean diversity per organism, Hmax, Hmin, ii, and the ratios H/1\nax and H/8min wasperformed on an IBM 1620 computer at the Narragansett Marine Labor-atory under the direction of Dr. Saul B. Saila. The most significant results were (i) marked reduction in community diversity (H) below 2 ft (Table 5), without a significant change in H with depth (Table 8), and (ii) corresponding increase of redundancy, R (Table 11). Distribution of this report does not constitute publication, and the data are subject to correction and/or revision. Bernard C. Patten 26 September 1962 Experiment No. J. 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 -3-EXPERIMENT DATES Dates 22-23 Jun 196029-30 Jun6-7 Jul13-14 Jul19-20 Jul27-28 Jul3-4 Aug10-11 P..ug 17-18 A.ug24-25 �.ug31 Aug - 1 Sep7-8 Sep14-15 Sep21-22 Sep27-28 Sep11-12 Oct19-20 Oct1-2 Nov15-16 Nov21-22 :Nov6-7 Dec16-17 Dec6-7 .Jan 196124-25 Jan10-11 Feb24-25 Feb3-4 Mar10-11 Mar17-18 Mar25-26 Mar30-31 Mar6-7 Apr14-15 Apr21-22 Apr5-6 May19-20 May1-2 Jun-4-Table 1. Number of phytoplankton taxa (rn) recorded at different depths. Expt. No. s 2 6 .10 B 1 11 9 13 9 13 2 15 13 9 10 3 3 14 15 10 9 14 4 13 12 12 13 11 5 15 16 13 11 9 6 15 17 11 13 8 7 14 9 10 7 8 8 16 18 10 15 6 9 18 14 16 15 12 10 15 12 9 12 7 11 16 10 8 8 11 12 17 12 8 5 6 13 14 15 13 9 9 8 15 9 9 5 6 5 16 10 9 9 11. 1217 13 13 11 7 8 1·0 7 6 13 4. 5 19 20 15 18 12 lC 10 21 12 10 9 ll. 1322 14 19 16 lEi 15 23 ll 14 11 1r1�. 14 24 15 14 16 17 18 25 18 25 17 19 20 26 18 11 16 lfi 12 27 15 15 17 17 20 28 24 25 18 lEi 21 29 19 21 20 28 29 30 16 19 18 20 21 31 16 15 11 11 15 32 13 11 16 1r-> 14 33 15 12 14 14 14 34 8 10 10 12 6 35 10 2 3 7 8 36 --37 9 8 8 3 7 x 14.l 13.4 12.0 11.B 11.8 -5-Table 2. Cell counts (N) in units (cells, chains, or colonies) per ml Expt. No. s 2 6 10 1 3003 4107 954 105�! 2 3786 4020 1115 1337 3 6440 6068 3832 189�? 4 2109 2247 1559 1219 5 6208 6336 2047 2039 6 2666 4348 896 790 7 5022 3017 3999 63S 8 2964 4682 794 89�� 9 5622 5577 2582 4896 10 1916 1692 989 531 11 2034 1261 649 24S 12 1423 1406 371 31-::> 13 14 2742 7540 8565 906 15 1837 1281 1044 1203 16 1616 2309 3297 1206 17 5946 1434 1766 1057 18 913 502 948 349 19 20 2623 2499 2444 1961 21 948 1079 920 725 22 1851 1393 956 1417 23 1092 677 1010 1288 24 1516 1365 2185 2011 25 2478 3049 2073 2009 26 1263 1670 4833 3291 27 2330 2740 2405 1844 28 2688 2593 1838 1811 29 2852 2900 3039 4089 30 3358 3178 2830 3381 31 1227 697 934 994 32 3526 5012 6732 2881 33 4146 3925 2325 2281 34 1053 398 448 210 35 2877 77 285 579 36 37 1685 718 516 286 x 2758 2700 2094 1510 B 2437 279 1534 1818 2336 553 1273 849 1691 503 650 231 371 98 948 245 703 ---2393 753 1378 1346 3096 2491 3078 1709 2273 2085 2586 747 1927 2059 856 314 ---496 1356 -6-Table 3. 8max.' bits/ml.Expt. No. s 2 6 10 B l 10388.6 13018.8 3530.2 3334.7 9017.9 2 14791. 4 14875.7 3534.4 4-441.4 442.2 3 24519.3 23706.9 12729.6 5997.5 5840.5 4 7804.2 8055.4 5588.9 4510.8 6289.2 5 24253.9 25343.9 7574.8 7053.8 7404.9 6 10415.7 17777.2 3099.6 2923.3 1659.0 7 19120.5 9563.6 13284.3 1782.7 3819.0 8 11855.0 19523.S 2637.6 a484.9 2194.6 9 23443.2 21266.5 10328.0 19128.l 6062.1 10 7485.6 6065.7 3135.0 1903.6 1412.1 11 8136.0 4188.9 1947.0 2248.6 735.0 12 5816.4 5040.4 1113.0 81.3 597.1 13 14 10712.7 27901. 2 27150.3 2871. 9 1113.0 15 5823.1 4060.7 2424.1 :3109.7 227.5 16 5368.2 7319.3 10451. 2 4172.1 3398.5 17 22002.7 5306.4 6109. 3 :2963. 4 735.0 18 2563.1 1297.6 3508.0 6 98.0 1632.3 19 20 10247.7 10420.6 8761. 6 6514.3 7949.3 21 3398.5 3584.3 2916.3 2508.1 2786.4 22 7047.4 5917.3 3824.0 .5668.0 5383.7 23 3777.7 2577.6 3494.0 4617.4 5124.7 24 5922.8 5197.0 8740.0 8219.9 12910.0 25 10333.0 14159.l 8473.3 8534.1 10765.9 26 5266.6 5777.2 19331. 9 13164.0 11034.5 27 9103.0 10704.8 9830.3 7537.2 7386.1 28 12324.3 12041. 5 7664.3 7244.0 9983.7 29 12115. 0 12737.7 13134.3 18496". 8 10128.9 30 13432.0 13499.9 11800.8 lflr612. 4 11358.5 31 4908.0 2723.l 3231.1 3438.7 2918.4 32 13047.7 17338.6 26927.9 11255.7 7336.7 33 16197.9 14070.9 8852.l 8506. 0 7839.3 34 3159.0 1322.l 1488.2 752.8 2212.7 35 9557.1 77.0 451. 7 1625.4 942.0 36 37 5341.3 2154.0 1548.0 453.3 1392.4 x 10578.8 10253.4 7606.3 5701.6 5004.2 -7-Table 4. 8min' bits/mLExpt. No. s 2 6 10 B l 115.5 96.0 118.7 80.3 135.0 2 166.4 143.6 80.9 9:3.4 16.2 3 164.5 175.9 107.1 87.l 137.5 4 132.4 122.4 116.6 11:2.9 108.2 5 176.4 189.4 131.9 109. 9 89.5 6 159.3 193.3 98.0 115.4 63.7 7 159.8 92.4 107.7 55.8 72.2 8 172.9 207.2 86.6 137.0 48.6 9 211.7 161.8 170.0 171.6 117.9 10 152.6 117.9 79.6 99.4 53.8 11 164.8 92.7 65.3 55.4 93.3 12 167.5 115.0 59.7 20.2 39.2 13 14 159.8 154.6 104.5 78.5 59.7 15 86.7 82.5 40.1 51.1 26.3 16 95.9 89.4 93.5 102.3 108.7 17 150.4 125.8 107.8 60.2 55.4 18 59.0 44.8 118.6 25.3 37.8 19 20 158.9 191. B 123.8 98.4 101.0 21 108.7 90.6 78.7 94.9 114.5 22 141.0 187.8 148.3 156.9 145.9 23 100.9 122.0 99.7 113.6 135.0 24 147.8 135.3 166.3 175.5 197.1 25 191. 6 277.6 176.2 197.4 214.3 26 175.0 107.0 183.5 175. 2 127.4 27 156.5 159.8 179.6 173.5 203.9 28 216.9 272.0 184.2 162.2 222.9 29 206.5 229.9 219.7 263.8 308.4 30 175.6 209.3 194.8 222.7 226.6 31 153.8 132.0 98.6 99.5 133.4 32 141.4 122.9 190.7 160. 8 141.8 33 168.2 131.3 145.3 176.3 143.0 34 70.2 77.6 79.l 84.4· 48.7 35 103.4 6.2 16.3 55.0 5-7. 9 36 37 85.7 66.4 63.0 16.3 53.7 x 147.0 138.9 118.6 109.0 115.5 -8-Table 5. Community diversity, H, in bits/ml. Expt. No. s 2 6 10 B l 6329.0 7288.9 2540.1 2978.1 7513.4 2 10126.9 10284.1 3294.7 3545.0 419.0 3 13622.2 18778.9 8409.1 4590.2 5622.2 4 6416.3 6814.8 4252.5 3653.3 4906.0 5 17572.7 16107.2 5062.3 4093.8 3429.5 6 7318.1 11653.2 2904.1 2694.4 1464.6 7 11351. a 5489.4 3978.3 14-90. 3 2140.6 8 7877.6 14756.8 1936.0 2718.6 1564.2 9 16888.7 15496.1 9037.1 8748.8 4881. a 10 5655.7 4814.7 2666.9 1554.2 1147.8 11 7088.8 3735.3 1495.2 559.1 2026.9 12 5204.2 4370.4 962.4 81.3 467.6 13 14 7293.9 20368.3 6407.4 2796.6 962.4 15 2216.4 2413.0 1854.8 1471. 5 140.6 16 4010.3 4350.7 4268.8 3334.4 2203.0 17 16562.7 3334.8 4232.6 2111.3 559.1 18 2133.5 1005.9 2768.7 671.3 134-2. 419 20 6520.7 7411.1 7192.7 SL�26. 0 5548.1 21 2430.9 2244.7 2254.2 2125.4 1693.1 22 5040.3 4617.4 3077.7 4946.0 3923.6 23 2206.1 2104.0 2205.8 2951. 3 4400.6 24 4157.2 3704.3 6901. 2 5101.6 9383.4 25 6727.4 10316.4 5449.9 6234.6 7281. 9 26 2981. 6 5128.8 11226.4 6274.9 7577.4 27 6157.8 7540.6 7685.0 6152.5 6005.1 28 9350.0 8400.3 6553.8 5786.9 8338.9 29 5306.4 9120.1 8956.6 12B35.8 8877.7 30 9997.4 9029.4 7976.0 8651.4 7806.l 31 4136.7 1938.5 2563.8 2B63.l 2439.2 32 5291. 7 8334.4 9953.5 7456.8 4978.3 33 9654.7 8939.0 6661. 0 6168.1 5769.8 34 2162.9 830.9 1292.8 565.4 1169.7 35 5803.4 33.8 325.4 1029.5 658.6 36 _.. __ 37 4198.4 1598.2 1112.7 274.2 1286.8 x 7052.4 7156.1 4631.1 3880.5 3762.6 Expt. No. l 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 x -s-Table 6. Hmax' bits/ml.s 2 6 3.459 3.170 3.700 3.907 3.700 3.170 3.807 3.907 3.322 3.700 3.585 3.585 3. 907 4.000 3.700 3.907 4.087 3.459 3.807 3.170 3.322 4.000 4.170 3.322 4.170 3.807 4.000 3.907 3.585 3.170 3.000 3.322 3.000 4.087 3.585 3.000 3.907 3.700 3.170 3.170 3.170 2.322 3.322 3.170 3.170 3.700 3.700 3.459 2.807 2.585 3.700 3.907 4.170 3.585 3.585 3.322 3�170 3.807 4.248 4.000 3.459 3.807 3.459 3. 907 3.807 4.000 4.170 4.644 4.087 4.170 3.459 4.000 3. 907 3.907 4.087 4.585 4.644 4.170 4.248 4.392 4.322 l!-. 000 4.248 4.170 4.000 3.907 3.459 3.700 3. LJ.59 4-. 000 3. 907 3.585 3.807 3.000 3.322 3.322 3.322 1.000 1.585 3.170 3.000 3.000 3.747 3.627 3.494 10 B 3.170 3.700 3.a22 1. 5853.170 3.8073.700 3.4593.459 3.1703.700 3.0002.B07 3.0003.907 2.5853.907 3.5853.585 2.8073.000 8.4592.322 2.5853.170 3.000 2.585 2.322 3.459 3.585 2.807 3.000 2�000 2.-322 3.322 3.322 3.459 3.700 4.000 3. 9073.585 3.8074.087 4.1704.248 4.3224.000 3.5854.087 4.3224.000 4.3924.524 4.8584.322 4.3923.459 3.9073.907 3.8074.087 3.8073.585 2.5852.807 3.-0001. 585 2.807 3.445 3.402 -10-Table 7. H . bits/ml. min, Expt. No. s 2 6 10 B l 0.038 0.023 0.124 0.076 0.055 2 0.044 0.036 0.073 0.070 0.058 3 0.025 0.030 0.028 0.046 0.090 4 0.063 0.054 0.075 0.101 0.060 5 0.028 0.030 0.064 0.054 0.038 6 0.060 0.044 0.109 0.146 0.115 7 0.032 0.031 0.027 0.088 0.057 8 0.058 0.04-4 0.109 0.154 0.057 9 0.038 0.029 0.066 0.035 0.070 10 0.080 0.070 0.080 0.187 0.107 11 0.081 0.073 0.101 0.226 0.144 12 0.118 0.082 0.161 0.576 0.170 13 14 0.058 0.020 0.012 0.087 0.161 15 0.047 0.064 0.038 0.042 0.269 16 0.059 0.039 0.028 0.085 0.115 17 0.025 0.088 0.061 0.057 0.226 18 0.064 0.089 0.125 0.072 0.054 19 20 0.060 0.077 0.051 0.050 0.042 21 0.115 0.084 0.086 0.131 0.152 22 0.076 0.135 0.155 0.111 0.106 23 0.092 0.180 0.099 0.088 0.100 24 0.098 0.099 0.076 0.087 0.064 25 0.077 0.091 0.085 0.098 0.086 26 0.138 0.064 0.038 0.053 0.041 27 0.067 0.058 0.075 0.094 0.119 28 0.097 0.105 0.100 0. 090 0.098 29 0.072 0.079 0.072 0.064 0.148 30 0.052 0.066 0.069 0.066 0.088 31 0.125 0.189 0.106 0 • .100 0.179 32 0.040 0.024 0,028 0.056 0.073 33 0.040 0.033 0.062 0.085 0.069 34 0.067 0.195 0.177 0.402 0.057 35 0.036 0.081 0.057 0.095 0.184 36 37 0.051 0.092 0.122 0.057 0.108 x 0.065 0.073 0.080 0.113 0.105 -11-Table 8. Diversity per organism, tr, in bits/ml. Expt. No. s 2 6 10 B ·_1 2. J.08 1. 775 2.663 2.B31 3.083 2 2.675 2.558 2.955 2.651 1. 5023 2.115 3.095 2.194 2. L�26 3.6654 3.042 3.033 2.728 2. 997 2.6985 2.831 2.542 2.473 2e008 1.4686 2.745 2.680 3.241 3.410 2.6487 2.260 1.820 0.995 2.a47 l. 6828 2.658 3.152 2.438 3.048 1.8409 3.004 2.958 3.500 1. 787 2.88610 2.952 2.846 2.697 2.927 2.28211 3.485 2.962 2.303 2.:282 3.11112 3.657 3.108 -2. 594 2.:322 2.0241314 2.660 2.701 0.748 3.087 2.594 15 1.206 1.884 1. 777 1.223 1.434 16 2.482 1. 884 1. 295 2.765 2.324 17 2.786 2.326 2.397 1.997 2.292 18 2.337 2.004 2.920 1. 924 1-. 910 1920 2.486 2.966 2.943 2.767 2.318 21 2.564 2.080 2.450 2.932 2.248 22 2.723 3.315 3.219 3.490 2.847 23 2.020 3.108 2.184 2.291 3.269 24 2.742 2.714 3.158 2.537 3.031 25 2.715 3.384 2.629 3.103 2. 92326 2.361 3.071 2.323 1. 907 2.46227 2.643 2.752 3.195 3.336 3.51428 3.478 3.240 3.566 3.195 3.66929 1. 860 3.145 2.947 3.139 4.25830 2.977 2.841 2.818 2.559 3.01931 3.371 2.781 2.745 2.880 3.265 32 1. 501 1.. 663 1.478 2.588 2.583 33 2.326 2.277 2.865 2.964 2.802 34 2.054 2.088 2.886 2.692 1.366 35 2.017 0�439 1-.142 1. 778 -2--. 0983637 2.492 2.226 2.156 0.959 2.594 x 2.569 2.571 2.489 2.563 2.579 -12-Table 9. H/Hmax· •.Expt. No. s 2 6 10 B l 0.609 0.560 0.720 0.893 0.833 2 0.685 0.691 0.932 0.798 0.948 3 0.556 0.792 0.660 0.765 0.963 4 0.822 0.846 0.761 0.810 0.780 5 0.724 0.636 0.668 0.580 0.463 6 0.702 0.656 0.937 0. 922 0.883 7 0.594 0.574 0.299 0.836 0.560 8 0.664 0.756 0.734 0.780 0.712 9 0.720 0.777 0.875 OA75 0.805 10 0.756 0.794 0.851 0 .. 816 0.813 11 0.871 0.892 0.768 0.761 0.899 12 0.895 0.867 0.865 1 .. 000 0.783 13 14 0.681 0.730 0.236 o .. 974 0.865 15 0.381 0.594 0.765 0.473 0.618 16 0.747 0. 594. 0.408 0 .. 799 0.648 17 0.753 0.628 0.693 o .. 711 0.761 18 0.832 0.775 0.789 0.962 0.822 19 20 0.636 0.711 0.821 0.833 0.698 21 0.715 0.626 0.773 0.847 0.608 22 0.715 0.780 0.805 0.873 0.729 23 0.584 0.816 0.631 0.639 0.859 24 0.702 0.713 0.790 0.621 0.727 25 0.651 0.729 0.643 0.730 0.676 26 0.566 0.888 0.581 0.477 0.687 27 0.676 0.704 0.782 0.816 0.813 28 0.759 0.698 0.855 0.799 0.835 29 0.438 0.716 0.682 0.694 0.876 30 0.744 0.669 0.656 0.592 0.687 31 0.843 0.712 0.793 0.833 0.836 32 0.406 0.481 0.370 0.662 0.678 33 0.595 0.635 0.752 0.725 0.736 34 0.685 0.628 0.869 0.751 o. 52935 0.607 0.439 0.720 0.633 0.69936 37 0.786 0.742 0.719 0.605 0.924 x 0.679 0.701 0.712 0.750 0.787 Expt. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 x s 54.80 60.87 106. 7548.4499.6345.9571.0345.5579. 7637.0743.0231.0845.63 25.56 41.82 110.10 36.18 41.02 22.37 35. 74 21.87 28.12 -13-Table 10. H/H min.2 6 75.91 21..41 71. 59 40.70 78.50 52 .. 72 55.66 36.47 85.04 38.37 60.27 29.64 59.37 36.95 71.21 22.35 101. 98 53.17 40.83 33.52 40.31 22.88 38.01 16.13 131. 79 61.31 29. 23 46.25 48.68 45.66 26.52 39.26 22.44 23.35 38.64 58.11 24.77 2B.64 24.58 20.75 17.24 22.12 27.38 41.49 35.11 37.16 30.93 17.04 47.93 61.16 39.34 47.18 4-2. 7835.70 30.88 35.5725.69 39.66 40.7656.92 4.3.13 40.9326.90 14.68 26.0037.43 67.82 s:2 .1957.34- 68.08 45.8430.79 10.71 16.3456.13 5.41 19.9648.98 24.08 17.66 47.05 47.26 35.92 10 B 37 .10. 55.67 37.95 25.80 40.89 48.44 29. 72 45.32 37.25 38.32 23.35 22.99 26.70 29.66 19.84 32.13 50.99 41.40 15.63 21.34 10 .. 09 21.66 4 .. 03 11. 9435.61 16.13 29.77 5.34 32.59 20 .. 27 35.04 10.09 26.51 35.50 55.14 54.93 22.39 14.78 31. 52 26.89 25.99 32.59 29.07 47.62 31. 59 33.98 35.81 59.46 35.46 29.45 35.67 37.41 48.65 28.78 38.85 34.45 28.78 18.28 46.36 35.11 34.99 40.34 6.70 24.02 18.71 11.36 16.81 23.98 30. 46 30.45 -11.1 ..-Table 11. Redundancy, R Expt. No. s 2 6 10 B 1 0.395 0.4-43 o. 290 0.100 0.169 2 0.319 0.312 0,069 0.206 0,054 3 0.447 0.209 0.342 0.238 0.038 4 0.181 0.156 0.244 0.195 0.224 5 0.277 0.367 0 .. 338 0.42S 0.543 6 0.302 0.348 00065 0-081 0.122 7 0.400 0.430 0 .. 706 0.169 0.448 8 0.340 0.247 o .. 275 0.229 0.295 9 0.282 0.225 Oal27 0.548 0.199 10 0.250 0.210 0.153 0.193 0.194 11 0.131 0.111 Od240 0.259 0.105 12 0.118 0.136 0 .  143 0.000 0.232 13 14 0.323 0.271 0.767 0,027 0.143 15 0.629 0.414 0 .. 239 0.536 0.432 16 0.258 0. L!-10 0.597 0.206 0.363 17 0.249 0.380 0.313 0.294 0.259 18 0.172 0.283 0.218 d.040 0.182 19 20 0.369 0.294 0.182 0.170 0.306 21 0.115 0.383 0.233 0.158 0.409 22 0.291 0.227 0.203 0.131 0.279 23 0.427 0.193 0.380 0.370 0.145 24 0.306 0.295 0.214 0.388 0.277 25 0.356 0.277 0.364 0.276 0.330 26 0.449 0.114 0.423 0.530 0.317 27 0.329 0.300 0.222 0.188 0.192 28 0.246 0.309 0.148 0.206 0.168 29 0.572 0.289 0.323 0 .. 310 0.127 30 0.259 0.336 0.330 0 .. 414 0.319 31 0.162 0.303 0.213 0�17� 0.172 32 0.601 0.523 0.635 0.342 0.328 33 0.409 0.358 0.252 O.,tsl 0.269 34 0.322 0.395 0.139 0.280 0.482 35 0.397 0.610 0.290 0 .. 379 0.320 36 37 0.217 0.266 0.122 0.410 0.079 x 0.321 0.307 0.288 0.258 0.251 

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Phytoplankton diversity in the lower York River, Virginia, June 1960 -June 1961

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