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The availabil~ty of trawler discards is hkely to have a pronounced effect on the reproductlon of seabirds, but this importance IS normally difficult to quant~fy. A comparison between 2 breeding seasons of the lesser black-backed gull, one of them affected by a t rawl~ng moratorium, has allowed an assessment of the effects of discard availability on its egg laying. When trawlers operated, diet was dominated by fish from discards, while during the trawling moratorium gulls fed from refuse tips, olive tree fields and especially nce flelds. Although neither b r e e d ~ n g phenology was different nor was clutch size s~gnif~cant ly ower in the year of the trawling moratorium, the volume of the eqgs decreased significantly, showing the ~mportance of trawler discard availabil~ty as a proximate determinant of egg production of scavenging seabirds Since the moratonum overlapped with the c h ~ c k rearing stages in both years, breeding success \\.as probably lotver than before the estabhshment of the trawling mol-at o r~um In 1991 However, the breeding success was higher in 1994 than In 1995, when the moratorium overlapped iv~ th the entire period of chlck growth. Population dynamics of the species is probably affected by changes in trawler discard availab~lity, especially if a trawling moratorium continues for many years KEY \VORDS: Trawler discards Food availabil~ty Moratorium Lesser black-backed gull Egg-laying Population dynamics . Reproduction

Effects of trawler discard availability on egg laying and breeding success in the lesser black-backed gull Larus fuscus in the western Mediterranean