Hydro-ecological relations in the Delta Waters
Hydro-ecological relations in the Delta Waters Hydro-ecological relations in the Delta Waters
subitanteally and thac 6f piseimres and divhg ducks inereased. The distribution of individual species omer the bebins is even mare pronounced than that vf the bhlrd groops. In Figure ?, as an example, the proportion of the total number in the Voordelta, tbe tidal areas (Krammer-Volkerak. Oosterschelde, liesterschalde), the saline (Grevelin~en. Veetse Meex) and freshwater lakes tltaringvlier.. Hollands Mep, Biesbasoh) for aome important auct species is given, Common Scoters are found almost exclwively in the Qoerdelta. OBldeneyes in the salhe lakes and Tufted Ducks and Piachards in freshwater lakes. Digeonrc d Pintail$ occur whly 14 the tidsl azebs, Mal,larb are coxmen everywhere with the exception of the Voordelta and Csots elearly prefeh saline lakes. eimilar preferewes e-xists ia the ctbr species. B~wewfa Wiidal areas =$aline lakes @~reshw&er lams a~oredelta HT~U~I area S5allne lakgs B~Ms~~w&~@P lakes Figure 7 DiGtrfbiltt6~l 6f msie @re& dyer the basins Cl[ecup& in tEe Vwordelta, ttie estuaries Per tidal araa's CW.steFs~chelde. Oastersobelde. 'ranmiecVoUter&>, s;lline lakes (Bees8 Weri Gre-in@% Heer] and f re~hwater Lake5 (IlarinmlLet, Roll& Diep, BLeebasch). The percatwe of bhe tstal sumber in each tatesprzy is p,Lotted.
In order to lsok for relatiouehips between prey and bird abundance and to cry to understand the distribution described abmve, the density of each bird group was calculated (the wan of the 12 average monthly c m s of the period 1975/76 - 1983184 was used). For each group the surfaces of t4e follwing habitats (for the tidal and stagnant basfns respeetlvely) were u ~ s t calculate o the density: pi8civores: tidal water and tidal areas er deep and &allow warer; waders: tidal flats or shores; 6iVing ducks: tidal wata and tidal ateas or deep a4ld shallow water; herbivores: sale marshes and adjacent wetlands ar $here6 aad shallow water. Of course this is a very crude approximation hut for such a large scale comparison no greater detidl can he used. Table 2 Winter density (N/1000 me) of Gobiid fish and densities of Piseivores (h11100 ha) in the different aquatic s$stems of the Delta arm. (Source of fish data: Cl) Ewrlynck (pen. mm.) (2) Bamerlynck, et al. (in press) (3) Dopmhos and Tviek. L987 (4) Waacdenburg and Meyer, 1988) (Voordelta (W); Westerscbelde (TB); Oosterschelde (05); rame er-Volkerak (KV); kevelinaen Meer (CH); Veerse Mser (W); Baringvliet (W); Bollaads Ddep (!.DJ; Biesbosch (BB)] Fish Bird Basin Density Seurce Density (~11000 m*) (e/ioo ha)
- Page 80 and 81: XBE CHANGING TmAL LAMXiCAPE I N TEE
- Page 82 and 83: The storm surke of L&Z1 A.D., knorm
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- Page 100 and 101: fn tidal water systems sedimentatio
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- Page 116: BEEEXNX, W.D. and 80ZBf&. J. L9M. T
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- Page 123 and 124: artificial waterflow was created af
- Page 125 and 126: of waterbirds occur regulsrly. The
- Page 127 and 128: . DISTRIBUXIOBI OF WATEJBIRoS OVER
- Page 129: small bird$ extludiag them vill net
- Page 133 and 134: Table 3 Biomass of macroroobenthos
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- Page 143 and 144: Bewick's Swans (Cygnus columbariusl
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- Page 149 and 150: DOQiWT$QS, G. 4 TWISK, F., 1987. De
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subitanteally and thac 6f piseimres and divhg ducks <strong>in</strong>ereased. The<br />
distribution of <strong>in</strong>dividual species omer <strong>the</strong> beb<strong>in</strong>s is even mare<br />
pronounced than that vf <strong>the</strong> bhlrd groops. In Figure ?, as an example,<br />
<strong>the</strong> proportion of <strong>the</strong> total number <strong>in</strong> <strong>the</strong> Voordelta, tbe tidal areas<br />
(Krammer-Volkerak. Oosterschelde, liesterschalde), <strong>the</strong> sal<strong>in</strong>e<br />
(Grevel<strong>in</strong>~en. Veetse Meex) and freshwater lakes tltar<strong>in</strong>gvlier.. Hollands<br />
Mep, Biesbasoh) for aome important auct species is given, Common<br />
Scoters are found almost exclwively <strong>in</strong> <strong>the</strong> Qoerdelta. OBldeneyes <strong>in</strong><br />
<strong>the</strong> salhe lakes and Tufted Ducks and Piachards <strong>in</strong> freshwater lakes.<br />
Digeonrc d P<strong>in</strong>tail$ occur whly 14 <strong>the</strong> tidsl azebs, Mal,larb are<br />
coxmen everywhere with <strong>the</strong> exception of <strong>the</strong> Voordelta and Csots elearly<br />
prefeh sal<strong>in</strong>e lakes. eimilar preferewes e-xists ia <strong>the</strong> ctbr species.<br />
B~wewfa<br />
Wiidal areas<br />
=$al<strong>in</strong>e<br />
lakes<br />
@~reshw&er lams<br />
a~oredelta<br />
HT~U~I area<br />
S5allne lakgs<br />
B~Ms~~w&~@P<br />
lakes<br />
Figure 7 DiGtrfbiltt6~l 6f msie @re& dyer <strong>the</strong> bas<strong>in</strong>s Cl[ecup& <strong>in</strong> tEe<br />
Vwordelta, ttie estuaries Per tidal araa's CW.steFs~chelde.<br />
Oastersobelde. 'ranmiecVoUter&>, s;ll<strong>in</strong>e lakes (Bees8 Weri<br />
Gre-<strong>in</strong>@% Heer] and f re~hwater Lake5 (Ilar<strong>in</strong>mlLet, Roll&<br />
Diep, BLeebasch).<br />
The percatwe of bhe tstal sumber <strong>in</strong> each tatesprzy is<br />
p,Lotted.
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