The most common form of variability observed in the natural world is a seasonal change in numbers. Seasonal changes in abundance occur in both temperate and tropical latitudes. Whereas temperate changes relate to seasonal variation in sunlight, temperature, and wind, tropical seasonality is frequently related to rainfall or flooding. Figure 1 shows the clear seasonality in occurrence of the dab, Limanda limanda, a small flatfish which is only present in Bridgwater bay during the autumn and early winter. It is important to remember that many species are annual and for part of the year exist as resting stages such as eggs or pupae.
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