Helgoland Marine Research

Table 1 Secondary production of the cohorts of the population

From: Reproduction, population dynamics and production of Nereis falsa (Nereididae: Polychaeta) on the rocky coast of El Kala National Park, Algeria

Cohort	Wt	Wt₂ − Wt₁	Nt	Nt₁ + Nt₂/2	Production (g for 6 m²)
January	0.095	–	63	–	–
February	0.108	0.013	87	75	0.975
March	0.135	0.027	58	72.5	1.957
April	0.130	−0.005	47	52.5	−0.262
May	0.132	0.002	61	54	0.108
June	0.147	0.015	82	71.5	1.072
July	0.165	0.018	70	76	1.368
August	0.149	−0.016	72	71	−1.152
Total C1					4.066
September	0.083	0.083	82	41	3.403
October	0.100	0.017	62	72	1.224
November	0.105	0.005	74	68	0.340
December	0.100	−0.005	52	63	−0.315
Total C2					4.652
Total					8.718

Wt mean weight variation of a cohort between t₁ and t₂, Wt₁ and Wt₂ mean fresh weights of a cohort at times t₁ and t₂, Nt number of individuals in a cohort at times t, Nt₁ and Nt₂ numbers of individuals in a cohort at times t₁ and t₂

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ISSN: 1438-3888

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