Literature
- Behrends G. 1982. Analysis of stomach- and colon contents of 185 common seals from the Waddensea of Schleswig-Holstein. ICES, C.M. N:11.
- Benke H., Siebert U., Lick R., Bandomir B. and Weiss R. 1998. The current status of Harbour Porpoises (Phocoena phocoena) in German waters. Archive of Fishery and Marine Research 46: 97-123.
- Boudewijn T.J., Dirksen S. and van der Winden J. 1994. De voedselkeuze van Aalscholvers in de Grevelingen in het seizoen 1993-.
- Brenninkmeijer A. and Stienen E.W.M. 1992. Ecologisch profiel van de Grote Stern (Sterna sandvicensis). Rin-rapport 92/17: 107 pp.
- Buckens M. and Raeijmaekers M. 1992. Voedselkeuze Aalscholver in de Grevelingen. Internal Report, DGW Middelburg, 60 pp.
- Carss D.N. and Marquiss M. 1996. The influence of a fish farm on grey heron Ardea cinerea breeding performance. In: Greenstreet S.P.R. and Tasker M.L. (eds). Aquatic predators and their prey: 133-141. Fishing News Books, University Press, Cambridge.
- Carss D.N., 1993. Shags Phalacrocorax aristotelis at cage fish farms in Argyll, Western Scotland. Bird Study 40: 203-211. .
- Des Clers S. and Prime J. 1996. Seals and fishery interactions: observations and models in the Firth of Clyde, Scotland. In: Greenstreet S.P.R. and Tasker M.L. (Eds.) Aquatic Predators and Their Prey. Blackwell Scientific Publications, Oxford. 58-64.
- Havinga B. 1933. Der Seehund (Phoca vitulina L.) in den Holländischen Gewässern. Tijdschr. Ned. Dierk. Ver. 79: 79-111.
- Heggberget T.M. 1993. Marine feeding Otters (Lutra lutra) in Norway: seasonal variation in prey and reproductive timing. J. Mar. Biol. Ass. UK 73: 297-312.
- Härkönen T. and Heide-Jørgensen M.-P. 1991. The Harbour Seal Phoca vitulina as a predator in the Skagerrak. Ophelia 34: 193-207.
- Härkönen T.J. 1988. Food-habitat relationship of Harbour Seals and Black Cormorants in the Skagerrak and Kattegat. J. Zool., Lond. 214: 673-681.
- Kieckbusch J.J 1993. Beobachtungen zur Nahrungswahl des Kormorans (Phalacrocorax carbo sinensis) in der Umgebung des Naturschutzgebietes "Oehe-Schleimunde". Seevögel 14(2):19-22.
- Kieckbusch J.J. and Koop B. 1996. Kormoranmonitoring in Schleswig-Holstein. Vogelwelt 117: 349-354.
- Krause J. 1999. Analyse der Nahrungsreste im Verdauungstract von Phoca vitulina in Relation ze den tatschlich verfügbaren Nahrungsressourcen. MsC-thesis, Mathematisch- Naturwissenschaftliche Fakultät der Christian-Albrechts-Universität Kiel, 67p.
- Kruuk H. and Moorhouse A. 1990. Seasonal and spatial differences in food selection by otters (Lutra lutra) in Shetland (Scotland, UK). J. Zool. (London) 221: 621-638.
- Kruuk H., Conroy J.W.H. and Moorhouse A. 1987. Seasonal reproduction, mortality and food of otters (Lutra lutra L.) in Shetland. Symp. Zool. Soc. London 58: 263-278.
- Leopold M.F., Van Damme C.J.G. and Van der Veer H.W. 1998. Diet of cormorants and the impact of cormorant predation on juvenile flatfish in the Dutch Wadden Sea. J. Sea Res. 40: 93-107.
- Madsen F.J. 1957. On the food habits of some fish-eating birds in Denmark. Dan. Rev. Game Biol. 3:19-83.
- Mills D., 1969. The food of the Cormorant at two breeding colonies on the east coast of Scotland. Scot. Birds 5: 268-276. .
- Nilssen K.T., Haug T., Potelov V., Stasenkov V. and Timoshenko Y.K. 1995. Food habits of harp seals (Phoca groenlandica) during lactation and moult in March-May in the southern Barents Sea and White Sea. ICES J. mar. Sci. 52: 33-41.
- Pearson T.H. 1968. The feeding biology of sea-bird species breeding on the Farne Islands, Northumberland. J. Anim. Ecol. 37:521-552.
- Pierce G.J. Diack J.S.W. and Boyle P.R. 1989. Digestive tract contents of seals in the Moray Firth area of Scotland. J. Fish Biol. 35(suppl. A):341-343.
- Pierce G.J., Boyle P.R. and Diack J.S.W., 1991. Digestive track contents of seals in Scottish waters: comparison of samples from salmon nets and elsewhere. J. Zool., Lond. 225: 670-676. .
- Pierce G.J., Boyle P.R. and Thompson P.M. 1990. Diet selection by seals. Barnes M. and Gibson R.N. (Eds.) Trophic Relationships in the Marine Environment. Proc. 24th Europ. Mar. Biol. Symp. 222-238.
- Sievers U. 1989. Nahrungsokologische Untersuchungen an Seehunden (Phoca vitulina, Linne 1758) aus dem schleswig-holsteinischen Wattenmeer. Zool. Anz. 222: 249-260.
- Taylor I.R. 1979. Prey selection during courtship feeding in the Common Tern. Ornis Scand. 10: 142-144.
- Thompson P.M., Tollit D.J., Greenstreet S.P.R., Mackay A. and Corpe H.M. 1996. Between-year variations in the diet and behaviour of harbour seals Phoca vitulina in the Moray Firth; causes and consequences. In: Greenstreet S.P.R. and Tasker M.L. (Eds.) Aquatic Predators and Their Prey. Blackwell Scientific Publications, Oxford. 44-52.
- Tollit D.J. and Thompson P.M. 1996. Seasonal and between-year variations in the diet of harbour seals in the Moray Firth, Scotland. Can. J. Zool. 74: 1110-1121.
- Tollit D.J., Greenstreet S.P.R. and Thompson P.M. 1997. Prey selection by harbour seals, Phoca vitulina, in relation to variations in prey abundance. Can. J. Zool. 75: 1508-1518.
- Van Damme C. 1994. Poep en kots: dieetstudies van Zeehonden en Aalscholvers. Ongepubl. rapport, NIOZ, Texel, 32pp, bijlagen I-XLIII.