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Northern Treatment Works (29483100)


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Conservation status UNPROTECTED
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Sewage works with open and reed-fringed ponds, some floating vegetation, reedbeds, and some mud. Holds a good variety of waterbirds, including Greenbacked Heron, Blackcrowned Night Heron, Little Bittern, Black Crake, Purple Gallinule and African Jacana. Waterfowl numbers generally low, except for Egyptian Goose; 35 Black Duck were counted in summer 1995. Cormorant, Cattle Egret and Sacred Ibis numbers are good; all peak in winter. Whiskered and Whitewinged Tern numbers are good in summer, when Common and Little Terns have also occurred. In summer 1997, 272 Wood Sandpiper were recorded. Recent increases in numbers of Whitebreasted Cormorant, Sacred Ibis and Egyptian Goose have contributed to the upward trend shown on total count and biomass graphs. A critical threat is posed by over-trimming of vegetation at pond margins; other threats are alien plant infestation, and the lowering of nutrients following changes in sewage processing methods.

SppCommon nameTaxonomic nameMinAvgMaxIBASubregional
67Bittern, LittleIxobrychus minutus11.001   
212Coot, Red-knobbedFulica cristata16.3123   
50Cormorant, ReedPhalacrocorax africanus235.88170   
47Cormorant, White-breastedPhalacrocorax carbo139.65117   
203Crake, BlackAmaurornis flavirostris12.005
52Darter, AfricanAnhinga rufa16.2526   
95Duck, African BlackAnas sparsa18.4032   
10006Duck, DomesticAnas platyrhynchos11.502
101Duck, FulvousDendrocygna bicolor2424.0024   
10005Duck, HybridAnas hybrid22.002
1016Duck, MallardAnas platyrhynchos11.001
10014Duck, UnidentifiedN/A N/A11.502
104Duck, White-backedThalassornis leuconotus510.0015   
100Duck, White-facedDendrocygna viduata110.0044   
96Duck, Yellow-billedAnas undulata212.88107   
61Egret, CattleBubulcus ibis189.23400   
58Egret, GreatEgretta alba11.001   
59Egret, LittleEgretta garzetta13.9712   
60Egret, Yellow-billedEgretta intermedia12.003   
149Fish-eagle, AfricanHaliaeetus vocifer11.442
10004Goose, DomesticAnser anser621.2832
89Goose, EgyptianAlopochen aegyptiacus5322.67649   
88Goose, Spur-wingedPlectropterus gambensis18.4428   
4Grebe, Great CrestedPodiceps cristatus11.001   
6Grebe, LittleTachybaptus ruficollis119.0770   
263Greenshank, CommonTringa nebularia12.175   
288Gull, Grey-headedLarus cirrocephalus22.002   
289Gull, Hartlaub'sLarus hartlaubii55.005   
72Hamerkop, HamerkopScopus umbretta15.2115   
64Heron, BlackEgretta ardesiaca11.001   
55Heron, Black-headedArdea melanocephala13.407   
56Heron, GoliathArdea goliath11.001   
63Heron, Green-backedButorides striata16.0012   
54Heron, GreyArdea cinerea13.7512   
57Heron, PurpleArdea purpurea11.433   
62Heron, SquaccoArdeola ralloides11.503   
81Ibis, African SacredThreskiornis aethiopicus599.78473   
83Ibis, GlossyPlegadis falcinellus11.001   
84Ibis, HadedaBostrychia hagedash321.5652   
228Jacana, AfricanActophilornis africanus112.9445  
395Kingfisher, GiantMegaceryle maximus11.452
397Kingfisher, MalachiteAlcedo cristata13.709
394Kingfisher, PiedCeryle rudis13.699
245Lapwing, BlacksmithVanellus armatus523.5648   
509Martin, Brown-throatedRiparia paludicola11.001
210Moorhen, CommonGallinula chloropus12.505   
69Night-Heron, Black-crownedNycticorax nycticorax16.1023  
42Pelican, Great WhitePelecanus onocrotalus116.9489   
41Pelican, Pink-backedPelecanus rufescens11.001   
238Plover, Three-bandedCharadrius tricollaris110.2135   
102Pochard, SouthernNetta erythrophthalma13.678   
256Ruff, RuffPhilomachus pugnax149.00152  
258Sandpiper, CommonActitis hypoleucos14.1111  
251Sandpiper, CurlewCalidris ferruginea714.5022  
262Sandpiper, MarshTringa stagnatilis12.004   
264Sandpiper, WoodTringa glareola139.43272   
90Shelduck, South AfricanTadorna cana12.476   
94Shoveler, CapeAnas smithii11.753   
85Spoonbill, AfricanPlatalea alba12.799   
270Stilt, Black-wingedHimantopus himantopus115.1541  
253Stint, LittleCalidris minuta219.7541   
80Stork, WhiteCiconia ciconia22.002   
77Stork, Woolly-neckedCiconia episcopus13.338   
208Swamphen, African PurplePorphyrio madagascariensis12.003  
98Teal, CapeAnas capensis11.502   
99Teal, HottentotAnas hottentota17.0628   
97Teal, Red-billedAnas erythrorhyncha27.4038   
291Tern, CommonSterna hirundo22.503   
299Tern, LittleSterna albifrons11.001   
305Tern, WhiskeredChlidonias hybrida140140.00140 75100
304Tern, White-wingedChlidonias leucopterus166.20169   
274Thick-knee, WaterBurhinus vermiculatus13.1710   
0Unknown, UnknownN/A N/A11.001
685Wagtail, African PiedMotacilla aguimp29.8927
686Wagtail, CapeMotacilla capensis521.5760
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Friday 25 May 2018 02:56
© Animal Demography Unit 2015
Department of Biological Sciences - University of Cape Town

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