Tweed Estuary SAC

Last updated: 15th September 2017

Advice on Seasonality

In the table below, the months highlighted in green in each row indicate the months in which significant numbers of each mobile designated feature are most likely to be present at the site during a typical calendar year. Months with significant numbers were highlighted on the basis of generic information on seasonal patterns of occurrence in published sources or from additional site specific surveys.

Applicants considering plans or projects scheduled in the periods highlighted in green would benefit from early consultation with Natural England given the greater scope for there to be likely significant effects that require consideration. The months which are not highlighted in green are not ones in which the features are necessarily absent, rather that features may be present in less significant numbers in typical years, but there may still be a significant effect. Please note that this period can vary between years and that in any one year considerable numbers of a species may be present (throughout the year or) outside of the months indicated below. Any assessment of potential impacts on the features must be based on up-to-date data and take account of population trends evident from these data and any other available information. Additional surveys may be required.
Feature nameLife StageJanFebMarAprMayJunJulAugSepOctNovDec
River lampreyDownstream migration (juveniles)
River lampreySpawning (Freshwater)
River lampreyUpstream migration (adults)
River lampreyEstuarine feeding
Sea lampreyDownstream migration (juveniles)
Sea lampreySpawning (Freshwater)
Sea lampreyUpstream migration (adults)