Seasonal variation of biochemical composition of Noah's ark shells (Arca noae L. 1758) in a Tunisian coastal lagoon in relation to its reproductive cycle and environmental conditions

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Table 4

Fatty acids, fatty acid ratios and sum that were used as trophic markers to identify A. noae diet in the Bizerte lagoon.

FATM/Source	References	Oct-13	Nov-13	Dec-13	Jan-14	Feb-14	Mar-14	Apr-14	May-14	Jun-14	Jul-14	Aug-14	Sep-14
C16:1n−7	Ackman et al. (1968)	7.05 ± 1.74^b	7.34 ± 2.47^b	8.10 ± 3.92^b	5.05 ± 0.78^a	5.91 ± 2.59^a	6.22 ± 1.42^ab	3.81 ± 1.60^a	6.78 ± 0.34^b	7.18 ± 1.43^b	6.06 ± 1.04^ab	9.28 ± 2.07^b	6.74 ± 1.65^ab
	Mayzaud et al. (1989)
	Ezgeta et al. (2012)
Diatoms	Kelly and Scheibling (2012)
Bacteria	Kelly and Scheibling (2012)
C20:5n−3	Mayzaud et al. (1989)	6.63 ± 1.40^a	6.30 ± 2.36^a	6.037 ± 0.82^a	5.62 ± 1.56^a	6.52 ± 1.26^a	6.59 ± 1.64^a	5.19 ± 0.55^a	7.68 ± 1.68^a	5.16 ± 0.77^a	4.21 ± 1.39^a	6.11 ± 0.53^a	5.78 ± 0.76^a
Diatoms	Budge and Parrish (1998)	6.63 ± 1.40^a	6.30 ± 2.36^a	6.037 ± 0.82^a	5.62 ± 1.56^a	6.52 ± 1.26^a	6.59 ± 1.64^a	5.19 ± 0.55^a	7.68 ± 1.68^a	5.16 ± 0.77^a	4.21 ± 1.39^a	6.11 ± 0.53^a	5.78 ± 0.76^a
C22:6n−3/C20:5n−3 > 1	Dalsgaard et al. (2003)	1.57 ± 0.2^a	1.06 ± 0.2^a	1.31 ± 0.2^a	1.55 ± 0.3^a	1.72 ± 0.6^a	1.79 ± 0.4^a	2.38 ± 0.7^b	1.39 ± 0.3^a	1.77 ± 0.3^a	2.16 ± 0.5^b	1.24 ± 0.2^a	1.72 ± 0.3^a
Dinoflagellates	Dalsgaard et al. (2003)	1.57 ± 0.2^a	1.06 ± 0.2^a	1.31 ± 0.2^a	1.55 ± 0.3^a	1.72 ± 0.6^a	1.79 ± 0.4^a	2.38 ± 0.7^b	1.39 ± 0.3^a	1.77 ± 0.3^a	2.16 ± 0.5^b	1.24 ± 0.2^a	1.72 ± 0.3^a
C22:6n−3	Mayzaud et al. (1989)	10.37 ± 2.16^b	6.66 ± 2.35^a	7.96 ± 1.86^a	8.51 ± 1.50^a	10.95 ± 3.09^b	11.44 ± 1.41^b	12.34 ± 3.56^b	10.71 ± 2.62^b	9.09 ± 1.57^a	8.77 ± 2.20^a	7.65 ± 1.75^a	9.86 ± 1.66^a
Zooplankton	Budge and Parrish (1998)
Dinoflagellates	Kharlamenko et al. (2001)
Dinoflagellates	Kelly and Scheibling (2012)
C18:2n−6	Mayzaud et al. (1989)	3.79 ± 0.52^a	2.14 ± 0.30^a	2.67 ± 0.47^a	2.77 ± 1.31^a	3.44 ± 0.66^a	3.35 ± 0.49^a	2.44 ± 0.45^a	3.38 ± 0.36^a	3.21 ± 0.34^a	2.88 ± 0.42^a	2.91 ± 0.24^a	2.20 ± 1.73^a
Zooplankton	Kelly and Scheibling (2012)
Seagrass
Macroalgae
Vascular plants
Detritus/Bacterial	Najdek et al. (2002)	11.4 ± 7.7^b	6.63 ± 2.2^a	6.86 ± 4.5^a	8.12 ± 5^a	8.83 ± 5.3^a	8.78 ± 5.4^a	7.37 ± 3.8^a	9.19 ± 6.1^b	10.1 ± 6.6^b	9.9 ±6.3 ^b	10.2 ± 6.7^b	8.54 ± 5.4^a
C15:0 + C18:1n−7	Ezgeta et al. (2012)	11.4 ± 7.7^b	6.63 ± 2.2^a	6.86 ± 4.5^a	8.12 ± 5^a	8.83 ± 5.3^a	8.78 ± 5.4^a	7.37 ± 3.8^a	9.19 ± 6.1^b	10.1 ± 6.6^b	9.9 ±6.3 ^b	10.2 ± 6.7^b	8.54 ± 5.4^a

Different letters (a, b and ab) in the same row indicate significant differences (p < 0.05).

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