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JANNIK HANSEN, LARS HOLST HANSEN, NIELS MARTIN SCHMIDT AND JEROEN RENEERKENSTABLE 1. Estimated numbers of pairs/territories in four sectors of the 15.8 km 2 census area inZackenbergdalen, 2008.
ZACKENBERG <strong>BIRD</strong>S 2008TABLE 2. Estimated numbers of pairs/territories in the 15.8 km 2 census area in Zackenbergdalen, 1996-2008.Regular breedersAveragemin. andmax. no. No ofNo. of territories nestsSpecies territories 1996-2006 found a CommentsRed-throated Diver 4 2.2-2.6 2Common Eider 0 0.4-0.5 0 Flocks seen in June, females with chicks in August*King Eider 0-1 1.4-2.1 0Long-tailed Duck 7-8 5.3-6.9 0Rock Ptarmigan 2-4 2.6-3.5 0Common Ringed Plover 16-22 30-36.5 4Red Knot 24-28 25.1-32.7 1Sanderling 60-67 48.8-56.7 29Dunlin 97-108 71.8-82 19Ruddy Turnstone 24-26 43-48.4 7Red-necked Phalarope 1-2 0.8-1.8 0Long-tailed Skua 19-25 18.5-22.3 5Glaucous Gull 1 0.3 1Common Raven 2 - 0 Nests outside the census area.Snow Bunting 54-60 40.4-45.5 0 Nests of passerines are only found oportunistically.Irregular breedersAveragemin. andmax. no. No ofNo. of territories nestsSpecies territories 1996-2006 found a CommentsPink-footed Goose 0 0.2 0 Min. 1181 immatures migrated northwards overthe areaEurasian Golden Plover 0 0.1 0Red Phalarope 1 0.6-0.8 1 First nest found by BioBasis at ZackenbergSnowy Owl 0 0.1 0Northern Wheatear 0 0.2-0.5 0Arctic Redpoll 3 1.1-3.3 0aWithin the census areathe wader nests were subjected to predation.Ruddy Turnstones suffered the lowestpredation; 22% of the nests were successful.Sanderling nests suffered heavily frompredation again this season, although a little lessthan in 2007 (Table 6). A single Sanderling nestwas abandoned during laying and another twoSanderling nests were abandoned beforehatching. All four common ringed plover neststhat were found eventually fell victim topredation. Just one nest of red knot was found in2008, and it suffered predation.The Arctic fox (Alopex lagopus) is the likelypredator of most nests, as very few nests werefound with clear signs of avian predators. Thenumber of fox encounters was relatively high in2008 and the minimum number of fox pupsproduced in the dens within the research areawas record high (Table 6).The mean clutch size across the three targetspecies was 3.7 in 2008, which is a little belowaverage (Table 7). Nests containing fewer thanfour eggs were: Common Ringed Plovers, twonests of three eggs – Sanderling; one nest ofthree eggs, two nest of two eggs, and two nestsof one egg – Dunlin: four nests of three eggs –Ruddy Turnstone; one nest of two eggs.In July and early August, alarm calling[81]
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