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Message: <blockquote data-quote="jogresh" data-source="post: 1674741" data-attributes="member: 15433">You keep repeating the same question Gradders, which has been partly though not fully answered; it may help folks get to the nub if you can explain "where you're coming from". I can't help i'm afraid.One important factor in population dynamics of Lapwing and Litle tern etc which has not been mentioned is productivity. The 2 poor years (2003 and 1991 at Spurn) are fine in the overall scheme, Little terns are long-lived birds which only need a good year every four or more. Lapwings need a fledging rate of 0.6/pair/year to maintain a population, though i suspect it may be even lower that that.There is however a strong argument for maintaining higher productivity of spp like these to compensate for other factors which people like Adam W have explained very well.Off birding, TTFN.</blockquote>