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Feeding Ecology of Northern Pintails and Green-winged Teal Wintering in California

Tables


Table 1. Aggregate percent (vol) data for major food items found in 262 northern pintail and 173 green-winged teal esophagi collected in 4 separate habitat types at Kern National Wildlife Refuge, California, during October through February, 1979-80 and 1980-81.
Food item Pintail Green-winged teal
Habitat typesa Habitat types
BG ST AB A ALL BG ST AB A ALL
Plant
   Red maids (Calandrinia ciliata)
trb tr tr tr tr tr tr 1 2 tr
   Willow weed
      (Polygonum lapathifolium)
2 tr tr 2 1 tr 2 1 tr 1
   Dock (Rumex spp.)
1 3 1 tr 2 tr 2 tr 2 1
   Common fivehook
tr 1 1 1 1 1 2 3 6 3
   Amaranth (Amaranthus spp.)
tr tr tr 2 tr tr tr tr 1 tr
   Ammannia
tr 1 tr 49 6 1 1 2 36 6
   Aster (Aster exilis)
tr tr tr tr tr 1 tr 5 2 2
   Alkali bulrush
1 4 13 1 5 tr 4 3 tr 2
   Spike-rush (Eleocharis spp.)
1 1 tr 1 1 tr 4 1 tr 2
   Swamp timothy
16 53 40 31 37 19 39 18 14 25
   Sprangle-top
5 4 10 3 6 4 3 6 5 4
   Common barnyardgrass
42 2 tr 2 12 36 4 tr 1 11
   Other (7 items)
3 3 3 2 3 1 2 4 14 5
Total plant matter
71 72 68 94 74 63 63 44 83 62
Animal
   Water fleas (Cladocera)
1 1 1 tr 1 1 2 2 2 2
   Seed shrimps
tr tr tr 2 tr 1 3 5 2 3
   Snails (Gastropoda)
3 tr tr 1 1 tr 2 1 tr 1
   Dragonflies and damselflies (Odonata)
2 tr tr 1 1 tr 1 tr 3 1
   Midges
22 22 27 3 22 29 22 46 11 27
   Flower flies (Syrphidae)
1 1 2   1 2 2 1 1 2
   Other (4 items)
2 4 2 1 2 3 4 2 tr 3
Total animal matter 31 28 32 8 28 36 36 57 19 39
a BG = Barnyardgrass, ST = Swamp timothy, AB = alkali bulrush, A = Ammannia, and ALL = All habitats combined.
b tr = < 0.5%

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