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Table 1 Monthly variation of total plant biomass (gDW.m −2 ) and amphipod abundance and values of Shannon-Wiener ( H ′) and evenness indexes ( J ′)

From: Abundance and diversity of amphipods (Crustacea: Peracarida) on shallow algae and seagrass in lagoonal ecosystem of the Mediterranean Tunisian coast

  October November December January February March April May June July August September Ni Di Ci Ci × Di TG
Macroalgae and seagrass                  
Ulva lactuca 4 7 5.15 2.11 3 3 8 10.73 60 66.10 68.60 30      
Cladophora sp. 0 0 7 2 3 3.73 0 0 8 11 0 0      
Gracilariopsis longissima 1 4 0 3 14 20 27 30 20.10 11.01 8 9.08      
Gracilaria bursa-pastoris 1 4 0 4 15 20 30.18 32 23 11.10 8.01 9      
Cymodocea nodosa 38 38.48 30 12 8 7 8 8 16.2 17 17 37.08      
Monthly total biomass 44 61.48 41.15 23.11 44 53.73 73.18 80.73 127.12 116.21 96.7 85.16      
Amphipods                  
Gammarus aequicauda (Martynov, 1931) 99 199 87 111 128 132 320 165 172 116 41 233 1,803 49.80 1 49.80 De
Gammarus insensibilis Stock, 1966 89 19 38 113 92 11 89 12 18 13 6 94 594 16.40 1 16.40 De
Gammarella fucicola (Laech, 1814)      15   49 32 18 34 87 81 325 8.97 0.66 5.92 He
Elasmopus rapax Costa, 1853 9 1     5        15 0.41 0.25 0.10 S
Monocorophium acherusicum (Costa, 1853) 7 3      1      4 15 0.41 0.33 0.13 Ds
Ericthonius difformis (Milne-Edwards, 1830) 21 20 28 67 11 48 8 14 8 32 29   286 7.90 0.91 7.18 Ds
Cymadusa filosa Savigny, 1816 13 19 12 6   15 5 14   153 159 84 480 13.26 0.66 8.75 He
Microdeutopus gryllotalpa Costa, 1853        5 10 1 9   9 34 0.94 0.41 0.38 He
Dexamine spinosa (Montagu, 1813)        11 10 4 42    67 1.85 0.33 0.61 De
Caprella sp. (Laech, 1814)   1            1 0.02 0.08 0.00 O
N 238 262 165 297 246 220 488 257 221 399 322 505 3,620 100    
H′ 2.19 1.53 1.70 1.54 1.37 1.05 1.74 1.74 1.03 1.92 1.68 1.98      
J′ 0.78 0.54 0.85 0.97 0.68 0.45 0.58 0.62 0.4 0.74 0.72 0.76