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Birds, mussels, cockles and shellfish fishery in the Dutch Wadden Sea: How to deal with low food stocks for eiders and oystercatchers?

  • Shellfish Fisheries
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Abstract

Intensive fishing in the Dutch Wadden Sea in the late 1980s and 1990, in combination with the effects of storms and ice and low spatfall, has led to an almost complete disappearance of intertidal mussel beds in 1990. Since then, this habitat type has re-established in only very few places, covering some hundreds hectares at the most. Lack of good spatfall in the late 1980s also resulted in low cockle stocks. These stocks were further reduced due to heavy mortality in the 1995/96 winter. These developments yielded very low food stocks for shellfish eating birds in some winters. This paper describes the fishery policy which came into force since 1993 and the effects the low food stocks have had on Eiders and Oystercatchers which are dependent on cockles and mussels. Eiders suffered higher mortality in 1991 and partly emigrated to alternative feeding areas on the North Sea and German Wadden Sea. Oystercatchers suffered higher mortality as well, were found in lower numbers in the Dutch Wadden Sea and in higher numbers in inland feeding areas. This information, together with a comparison of quantitative data on available food stocks and food consumption by birds, indicate that in some winters the number of shellfish eating birds has exceeded the carrying capacity of the Dutch Wadden Sea. Alternative food sources, such asMacoma balthica, Mya arenaria, Scrobicularia plana, Ensis americanus, Nereis spp. andArenicola marina cannot compensate for low mussel and cockle stocks. Before 1990, intertidal mussel beds must have acted as an important alternative food source. In the current situation, with hardly any intertidal mussel beds in the Dutch Wadden Sea, cockles represent the major food source, especially in winter. Since cockle stocks can be very low in some years they are an unreliable food source at the same time. Intertidal mussel beds represent a winter resistant and a more reliable food source. These considerations are important viewpoints in the discussion on a future fishery policy for the Dutch Wadden Sea. The most important conclusions from the present analysis is that re-establishment of intertidal mussel beds in the Dutch Wadden Sea is essential to allow the area to play its role as vitally important wetland in the East Atlantic flyway. In order to achieve this goal future fishery on intertidal mussel beds should be highly restricted.

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References

  • Baptist, H. J. M. &Witte, R. H. &Duiven, P. &Wolf, P. A. (1997): Aantallen EidereendenSomateria mollissima in de Nederlandse kustwateren en de Waddenzee in de winters 1993–1997. — Limosa,70: 113–118.

    Google Scholar 

  • Beukema, J. J. (1976): Biomass and species richness of the macro-benthic animals living on the tidal flats of the Dutch Wadden Sea. — Netherl. J. Sea Res.,10: 236–261.

    Article  Google Scholar 

  • —— —— —— (1985): Zoobenthos survival during severe winters on high and low tidal flats in the Dutch Wadden Sea. — In:Gray, J. S. &Christiansen, M. E. [Eds.]: Marine Biology of Polar Regions and Effects of Stress on Marine Organisms: 351–361: Chichester (Wiley).

    Google Scholar 

  • —— —— —— (1990): Expected effects of changes in winter temperatures on benthic animals living in soft sediments in coastal North Sea areas. — In:Beukema, J. J. &Wolff, W. J. &Brouns, J. J. W. M. [Eds.]: Expected Effects of Climatic Change on Marine Coastal Ecosystems: 83–92; Dordrecht (Kluwer).

    Google Scholar 

  • —— —— —— (1992a): Expected changes in the Wadden Sea benthos in a warmer world — lessons from periods with mild winters. — Netherl. J. Sea Res.,30: 73–79.

    Article  Google Scholar 

  • —— —— —— (1992b): Long-term and recent changes in the benthic macrofauna living on tidal flats in the western part of the Wadden Sea. — In:Dankers, N. &Smit, C. J. &Scholl, M. [Eds.]: Proc. 7th Internat. Wadden Sea Symp., Ameland 1990. — Netherl. Inst. Sea Res. Publ. Ser.,20: 135–141.

    Google Scholar 

  • —— —— —— (1993): Increased mortality in alternative bivalve prey during a period when the tidal flats of the Dutch Wadden Sea were devoid of mussels. — Netherl. J. Sea Res.,31: 395–406.

    Article  Google Scholar 

  • Beukema, J. J. &Cadée, G. C. (1996): Consequences of the sudden removal of nearly all mussels and cockles from the Dutch Wadden sea. — Pubbl. Staz. zool. Napole I: Mar. Ecol.,17: 279–289.

    Article  Google Scholar 

  • Beukema, J. J. &Essink, K. &Michaelis, H. &Zwarts, L. (1993): Year-to-year variability in the biomass of macrobenthic animals on tidal flats of the Wadden Sea — how predictable is this food source for birds. — Netherl. J. Sea Res.,31: 319–330.

    Article  Google Scholar 

  • Bunskoeke, E. J. &Ens, B. J. &Hulscher, J. B. &de Vlas, S. J. (1996): Why do OystercatchersHaematopus ostralegus switch from feeding on Baltic tellinsMacoma balthica to feeding on the RagwormNereis diversicolor during the breeding season? — Ardea,84A: 91–104.

    Google Scholar 

  • Camphuysen, C. J. (1996): Ecologisch profiel van de EidereendSomateria mollissima. — RIKZ werkdocument96.146X: 124 pp.; Texel.

  • Camphuysen, C. J. &Ens, B. J. &Heg, D. &Hulscher, J. B. &van der Meer, J. &Smit, C. J (1996): OystercatcherHaematopus ostralegus winter mortality in the Netherlands: die effect of severe weather and food supply. — Ardea,84A: 469–492.

    Google Scholar 

  • Clark, N. (1993): Wash Oystercatchers starving. — Wader Study Group Bull.,70: 51–52.

    Google Scholar 

  • Common Wadden Sea Secretariat [Ed.] (1991): Mussel Fishery in the Wadden Sea. — CWSS Working Document,1991–2: 56 pp.; Wilhelmshaven.

  • Dankers, N. (1993): Integrated estuarine management — Obtaining a sustainable yield of bivalve resources while maintaining environmental quality. — In:Dame, R. [Ed.]: Bivalve Filter Feeders in Estuarine and Coastal Ecosystem Processes. — NATO ASI Series, Ecological Sciences,G33: 479–511; Berlin (Springer).

    Google Scholar 

  • Dankers, N. &Koelemaij, K. (1989): Variations in the mussel population of die Dutch Wadden Sea in relation to monitoring of other ecological parameters. — Helgol. Meeresunters.,43: 529–535.

    Article  Google Scholar 

  • Dankers, N. &Koelemaij, K. &Zegers, J. (1989): De rol van de mossel en de mosselcultuur in het ecosysteem van de Waddenzee. — RIN Rapp.,89/9: 66 pp.; Texel.

  • Dijkema, K. S. &van Tienen, G. &van Beek, J. G. (1989): Habitats of the Netherlands, German and Danish Wadden Sea 1:100000. — RIN Texel/Veth Foundation, Leiden: 24 habitat maps.

  • Dittmann, S. (1990): Mussel beds — amensalism or amelioration for intertidal fauna. — Helgol. Meersunters.,44: 335–352.

    Article  Google Scholar 

  • Ens, B. J. &Cayford, J. T. (1996): Feeding with other Oystercatchers. — In:Goss-Custard, J. D. [Ed.]: The Oystercatcher. From Individuals to Populations: 77–104; Oxford (Oxford University Press).

    Google Scholar 

  • Ens, B. J. &Wintermans, G. J. M. &Smit, C. J. (1993): Verspreiding van overwinterende wadvogels in de Nederlandse Waddenzee. — Limosa,66: 137–144.

    Google Scholar 

  • Goethe, F. (1985): Eiderente,Somateria mollissima (L., 1758). — In:Goethe, F. &Heckenroth, H. &Schumann, H. [Eds.]: Die Vögel Niedersachsens und des Landes Bremen: Entenvögel. — Naturschutz und Landespflege in Niedersachsen, Sonderreihe B,2: 107–112.

    Google Scholar 

  • Goss-Custard, J. D. (1985): Foraging behaviour of wading birds and the carrying capacity of estuaries. — In:Sibley, R. M. &Smith, R. H. [Eds.]: Behavioural Ecology: 169–188; Oxford (Blackwell).

    Google Scholar 

  • Goss-Cusstard, J. D. &West, A. D. &Clarke, R. T. &Caldow, R. W. G. &le V. dit Durrell, S. A. E. (1996a): The carrying capacity of coastal habitats for Oystercatchers. — In:Goss-Custard, J. D. [Ed.]: The Oystercatcher. From Individuals to Populations: 327–351; Oxford (Oxford University Press).

    Google Scholar 

  • Goss-Cusstard, J. D. &West, A. D. &Sutherland, W. J. (1996b): Where to feed. In:Goss-Custard, J. D. [Ed.]: The Oystercatcher. From Individuals to Populations: 105–132; Oxford (Oxford University Press).

    Google Scholar 

  • Hulscher, J. B. (1996): Food and feeding behaviour. — In:Goss-Custard, J. D. [Ed.]: The Oystercatcher. From Individuals to Populations: 7–29; Oxford (Oxford University Press).

    Google Scholar 

  • Hulscher, J. B. &Alting, D. &Bunskoeke, E. J. &Ens, B.J. &Heg, D. (1996b): Subtle differences between male and female OystercatchersHaematopus ostralegus in feeding on the bivalveMacoma balthica. — Ardea,84A: 117–130.

    Google Scholar 

  • Hulscher, J. B. &de Jong, J. &van Klinken, J. (1993): Uitzonderlijk grote aantallen Scholeksters in het binnenland gedurende de winter van 1992/93. — Limosa,66: 117–123.

    Google Scholar 

  • Hulscher, J. B. &Exo, K.-M. &Clark, N. (1996a): Why do Oystercatchers migrate? — In:Goss-Custard, J. D. [Ed.]: The Oystercatcher. From Individuals to Populations: 155–185; Oxford (Oxford University Press).

    Google Scholar 

  • Janssen, G. M. &Loos, C. &van Dijk, J. J. (1995): Doelgroepnotitie schelpdiervisserij. — Rep. RIKZ 95.052: 29 pp.; Haren.

  • Keller, V. &Hario, M. (1997): Eider, Somateria mollissima. — In:Hagemeijer, W. J. M. &Blair, M. J. [Eds.]: The EBCC Atlas of European Birds: Their Distribution and Abundance: 110–111; London. (Poyser).

    Google Scholar 

  • Kersten, M. &Rappoldt, K. &van Scharenburg, K. (1997): Wadvogels op Ameland. — In:Versluys, M. &Engelmoer, R. &Blok, D. &van der Wal, R. [Eds.]: Vogels van Ameland: 56–87; Leeuwarden (Friese Pers).

    Google Scholar 

  • Kesteloo-Hendrikse, J. J. (1994a): Het kokkelbestand in de Oosterschelde, de Westerschelde en de Waddenzee in 1993. — PIVO Rep.,94-007: 69 pp.; IJmuiden.

  • -- -- -- (1994b): Het kokkelbestand in de Oosterschelde, de Westerschelde en de Waddenzee in 1994. — Preliminary RIVO Rep.: 47 pp.; IJmuiden.

  • Kesteloo-Hendrikse, J. J. &van Stralen, M. R. (1992): Het kokkelbestand in de Oosterschelde, de Westerschelde en de Waddenzee in 1992. — RIVO Rep. AQ 92-06: 44 pp.; IJmuiden.

  • -- & -- (1995): Het kokkelbestand in de Oosterschelde, de Westerschelde, de Waddenzee en de Voordelta in 1995. — Preliminary RIVO Rep.: 41 pp.; IJmuiden.

  • -- & -- (1996): Het kokkelbestand in de Oosterschelde, de Westerschelde, de Waddenzee en de Voordelta in 1996. — Preliminary RIVO Rep.: 43 pp.; IJmuiden.

  • Koopman, K. (1994): Scholekster bij Holwerd in de problemen? — Twirre,5: 1–5.

    Google Scholar 

  • Kuip, C. van der (1991): Wanbeleid in de Waddenzee kost duizenden vogels het leven. — Vogels,66: 230–235.

    Google Scholar 

  • Lambeck, R. H. D. (1991): Changes in abundance, distribution and mortality of wintering Oystercatchers after habitat loss in the Delta area, SW Netherlands. — Acta XX Congr. Intern. Ornithol., New Zealand 1991: 2208–2218.

    Google Scholar 

  • Lambeck, R. H. D. &Goss-Custard, J. D. &Triplet, P. (1996): Oystercatchers and man in the coastal zone. — In:Goss-Custard, J. D. [Ed.]: The Oystercatcher. From Individuals to Populations: 289–326; Oxford (Oxford University Press).

    Google Scholar 

  • Laursen, K. &Pihl, S. &Durinck, J. &Hansen, M. &Skov, H. &Frikke, J. &Danielsen, F. (1997): Numbers and distribution of waterbirds in Denmark 1987–1989. — Danish Rev. Game Biol.,15 (1): 1–181.

    Google Scholar 

  • Leopold, M. F. &Skov, H. &Hüppop, O. (1993): Where does the Wadden Sea end? Links with the adjacent North Sea. — Wadden Sea Newsletter,1993 (3): 5–9.

    Google Scholar 

  • Leopold, M. &Land, M. A.van der &Welleman, H. C. (in press):Spisula en Zee-eenden in de strenge winter van 1995/96 in Nederland. — BEON Rep.

  • McGrorty, S. &Clarke, R. T. &Reading, C. J. &Goss-Custard, J. D. (1990): Population dynamics of the musselMytilus edulis: density changes and regulation of the population in the Exe estuary Devon. — Mar. Ecol. Progr. Ser.,129: 157–169.

    Article  Google Scholar 

  • Meininger, P. L. &Berrevoets, C. M. &Strucker, R. C. W. (1994): Watervogeltellingen in het zuidelijk Deltagebied 1987–91. — Rep. RIKZ-94.005; Middelburg/NIOO-CEMO, Yerseke: 381 pp.

  • Meltofte, H. &Blew, J. &Frikke, J. &Rösner, H.-U. &Smit, C. J. (1994): Numbers and distribution of waterbirds in the Wadden Sea. — IWRB Spec. Publ.,34; Wader Study Group Bull.,74 (Spec. Iss.): 192 pp.

  • Ministerie Landbouw, Natuurbeheer en Visserij (1993): Vissen naar evenwicht. — Regeringsbeslissing Structuurnota Zee- en kustvisserij : 111 pp. Den Haag.

  • Nehls, G. (1995): Strategien der Ernährung und ihre Bedeutung für Energiehaushalt und Ökologie der Eiderente (Somateria mollissima (L., 1758)). — Thesis Christian Albrechts University, Kiel, 177 pp.

  • Poot, M. &Rasmussen, L. M. &Rösner, H.-U. &Roomen, M.van &Südbeck, P. (1996): Migratory waterbirds in the Wadden Sea 1993/94. — Wadden Sea Ecosystem No. 5, Wilhelmshaven: 79 pp.

  • Produktschap Vis- en Visprodukten (1994): Beheersplan kustvisserij en schelpdiervisserij.

  • Rösner, H.-U. &van Roomen, H. &Südbeck, P. &Rasmussen, L. M. (1994): Migratory waterbirds in the Wadden Sea 1992/93. — Wadden Sea Ecosystem No.2, Wilhelmshaven: 72 pp.

  • Schekkerman, H. &Meininger, P. L. &Meire, P. M. (1994): Changes in the waterbird populations of the Oosterschelde (SW Netherlands) as a result of large-scale coastal engineering works. — Hydrobiol.,283: 509–524.

    Google Scholar 

  • Smit, C. J. (1981): Production of invertebrates and consumption by birds in the Dutch Wadden Sea. — In:Smit, C. J. &Wolff, W. J. [Eds.]: Birds of the Wadden Sea: 290–301; Rotterdam (Balkema).

    Google Scholar 

  • -- -- -- (1994): Alternatieve voedselbronnen voor schelpdier-etende vogels. — IBN Rep.,77: 80 pp.: Wageningen.

  • —— —— —— (1996): Tellingen van wad- en watervogels op Texel in de periode 1980–1990. — In:Dijksen, A.J. [Ed.]: Vogels op het Gouwe Boltje. Een volledig overzicht van de Avifauna van Texel: 89–122; Den Burg (Langeveld & De Rooy).

    Google Scholar 

  • Stralen, M. R.van (1990): Het kokkelbestand in de Oosterschelde en de Waddenzee in 1990. — Internal Rep. RIVO AQ,90-03: 47 pp.; IJmuiden.

  • -- -- -- (1998): De ontwikkeling van het mosselbestand in de Waddenzee en de Oosterschelde na 1992. — RIVO-DLO Rep.,c006.98: 31 pp.; IJmuiden.

  • Stralen, M. R.van &Kesteloo-Hendrikse, J. J. (1992): Het kokkelbestand en de broedval van kokkels in de Oosterschelde en in de Waddenzee in 1991. — RIVO Rep., AQ92-05: 46 pp.; IJmuiden.

  • -- & -- (1997): Het kokkelbestand in de Oosterschelde, de Westerschelde, de Waddenzee en de Voordelta in het najaar van 1996. Preliminary RIVO Rep., 38 pp.; IJmuiden/Yerseke.

  • -- & -- (1998): De ontwikkeling van het kokkelbestand in de Waddenzee (1971–1997) en de Oosterschelde (1980–1997). RIVO-DLO Rep.,c005.98: 52 pp.; IJmuiden.

  • Swennen, C. (1976): Populatiestructuur en voedsel van de EidereendSomateria m. mollissima in de Nederlandse Waddenzee. — Ardea,64: 311–371.

    Google Scholar 

  • -- -- -- (1991): Ecology and population dynamics of the Common Eider in the Dutch Wadden Sea. — Thesis Univ. Groningen: 144 pp.

  • Swennen, C. &Nehls, G. &Laursen, K. (1989): Numbers and distribution of EidersSomateria mollissima in the Wadden Sea — Netherl. J. Sea Res.,24: 83–92.

    Article  Google Scholar 

  • Tanger, D. (1993): Steltlopertellingen in Noord-Holland. — Nieuwsbrief Nederlandse Steltloper Werkgroep, 1-1: 8.

    Google Scholar 

  • Tsuchiya, M. &Nishihira, M. (1985): Islands ofMytilus as habitat for small intertidal animals: effect of island size on community structure. — Mar. Ecol. Progr. Ser.,25: 71–81.

    Article  Google Scholar 

  • —— & —— (1986): Islands ofMytilus edulis as habitat for small intertidal animals: effect ofMytilus age structure on the species composition of the associated fauna and community organisation. — Mar. Ecol. Progr. Ser.,31: 171–178.

    Article  Google Scholar 

  • Twisk, F. (1990): Groei en sterfte van overjarige kokkels in de Oosterschelde. — Rijkswaterstaat DGW, Rep. GWWS-90.13093; Middelburg.

  • Zegers, P. M. (1985): Vogeltelling in het Nederlandse deel van de Waddenzee, 1976–1979. — Rep. nat. Forest Serv., 85-10: 34 pp.; Utrecht.

  • Zegers, P. M. &Kwint, N. D. (1992): Vogeltellingen in het Nederlandse deel van het Waddengebied 1979–90. — SOVON Rep.1992/14: 51 pp.; Beek-Ubbergen.

  • Zwarts, L. (1991): Seasonal variation in body weight of the bivalvesMacoma balthica, Scrobicularia plana, Mya arenaria andCerastoderma edule in the Dutch Wadden Sea. — Netherl. J. Sea Res.,31: 231–245.

    Article  Google Scholar 

  • Zwarts, L. &Drent, R. H. (1981): Prey depletion and the regulation of predator density: Oystercatchers (Haematopus ostralegus) feeding on Mussels (Mytilus edulis). — In:Jones, N. V. &Wolff, W. J. [Eds.]: Feeding and Survival Strategies of Estuarine Organisms. — Marine Science,15: 193–216; New York (Plenum).

    Google Scholar 

  • Zwarts, L. &Wanink, J. (1989): Siphon size and burying depth in deposit- and suspension-feeding benthic bivalves. — Mar. Biol.,100: 227–240.

    Article  Google Scholar 

  • —— & —— (1991): The macrobenthos fraction accessible to waders may represent marginal prey. — Oecologia,87: 581–587.

    Article  Google Scholar 

  • —— & —— (1993): How the food supply harvestable by waders in the Wadden Sea depends on the variation in energy density, body weight, biomass, burying depth and behaviour of tidal-flat invertebrates. — Netherl. J. Sea Res.,31: 441–476.

    Article  Google Scholar 

  • Zwarts, L. &Wanink, J. H. &Ens, B. J. (1996a): Predicting seasonal and annual fluctuations in the local exploitation of different prey by OystercatchersHaematopus ostralegus: a ten-year study in the Wadden Sea. — Ardea,84A: 401–440.

    Google Scholar 

  • Zwarts, L. &Ens, B. J. &Goss-Custard, J. D. &Hulscher, J. B. &le V. dit Durell, S. A. E. (1996b): Causes of variation in prey profitability and its consequences for the intake rate of the OystercatcherHaematopus ostralegus. — Ardea,84A: 229–268.

    Google Scholar 

  • Zwarts, L. &Ens, B. J. &Goss-Custard, J. D. &Hulscher, J. B. &Kersten, M. (1996c): Why OystercatchersHaematopus ostralegus cannot met their daily energy requirements in a single low water period. — Ardea,84A: 269–290.

    Google Scholar 

  • Zwarts, L. &Cayford, J. T. &Hulscher, J. B. &Kersten, M. &Meire, P. M. &Triplet, P. (1996d): Prey size selection and intake rate. — In:Goss-Custard, J. D. [Ed.]: The Oystercatcher. From Individuals to Populations: 30–55; Oxford (Oxford University Press).

    Google Scholar 

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  1. Institute for Forestry and Nature Research (IBN-DLO), P.O. Box 167, NL-1790 AD, Den Burg, Texel, The Netherlands

    Cor J. Smit, Norbert Dankers, Bruno J. Ens & André Meijboom

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Smit, C.J., Dankers, N., Ens, B.J. et al. Birds, mussels, cockles and shellfish fishery in the Dutch Wadden Sea: How to deal with low food stocks for eiders and oystercatchers?. Senckenbergiana maritima 29, 141–153 (1998). https://doi.org/10.1007/BF03043952

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