Example of four modifications of yearly distribution patterns among periods: the four situations illustrate the different types of phenological changes accounted for in this study.

<p>The red arrows correspond to peak of abundance of species for the period 1 to 3 (noted: P1, P2, P3). A) The annual peak of E. encrasicolus abundance shiftedf earlier in the year for the period two and three. B) The annual peak of A. regius abundance shifted later in the year for the period three. C) The annual peak of E. affinis shifted earlier in the year for the period two and returned near the first situation during the third period. D) The annual peak of S. sprattus shifted later in the year for the period two and returned near the first situation at the third period (note: for this species, only the first peak of presence in the estuary was considered).