Population dynamics of lemmings, Lemmus sibirica and Dicrostonyx torquatus, and Arctic Fox Alopex lagopus on the Taimyr peninsula, Siberia, 1960—2001

Kokorev, Yakov I; Kuksov, Vladimir A

doi:10.34080/os.v12.22826

Cited by 16 publications

(2 citation statements)

References 13 publications

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“…This lack of cor-relation with lemming cyclicity contrasts to those reported on spring staging birds in the Wadden Sea (Prokosch 1988), in wintering birds in South Africa (Underhill 1987, Martin & Baird 1988, and likewise in southeastern India (Balachandran et al 2000). Also worth noticing, is that years of late spring and slow thaw in Taimyr, such as in 1989 and 1992 (Syroechkovski & Lappo 1994, Stock & Bruns 1995, Kokorev & Kuksov 2002, plausibly resulting in very poor breeding success, seem not to result in a consistent change in the number of birds observed in Sweden (Figure 4).…”

Section: Population Trendsmentioning

confidence: 71%

The spring migration of Grey Plover Pluvialis squatarola in Sweden

Blomqvist

Green²,

Lindström³

2007

Ornis Svec

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In 1976—1995, 74,650 Grey Plovers Pluvialis squatarola were recorded on spring passage, 87% in the southern third of Sweden, and 59% while in migratory flight. Few were observed before May. The passage peaked 24 May—2 June (83%). About one fourth of all birds were observed on a few occasions, when grounded by inclement weather, showing that only a tiny fraction stops over regularly. In northern Sweden, passage peaked earlier (18 May) than in the south (29 May), and these early birds were presumably destined for breeding or staging in the White Sea region. The peak dates in southern Sweden correlate well with arrival time in Siberia, indicating a non-stop flight to these breeding areas. Flocks counted up to several hundred birds in the south but at most 34 birds in the north. Migration patterns along the East Atlantic Flyway were similar with those of the East African/ West Asian and Mediterranian/Black Sea flyways. The spring passage of the Grey Plover conforms to the migration system of other tundra waders passing up through the western Palaearctic.

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Section: Population Trendsmentioning

confidence: 71%

The spring migration of Grey Plover Pluvialis squatarola in Sweden

Blomqvist

Green²,

Lindström³

2007

Ornis Svec

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“…

Det är väl känt att smågnagarpopulationer på nordliga breddgrader varierar cykliskt (Hansson 1984, Hansson & Henttonen 1985, Hansson 1999, för en översikt se Krebs & Myers 1974). Mest känd är troligen lämmelns cykler som ofta uppträder med en periodicitet av tre år (se exempelvis Kokorev & Kuksov 2002). Likaså är det känt att populationer av flera predatorer varierar cykliskt med gnagar-

…”

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Varierar brunand Aythya ferina periodiskt? – en analys av inventeringsresultat från Angarnsjöängen, Sverige, 1978—2003 och Engure, Lettland, 1972—1992

Söderholm¹

2006

Ornis Svec

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Annual counts of the number of breeding Pochard Aythya ferina at Angarnsjöängen, Sweden, 1978—2003, and at Engure, Latvia, 1972—1992, suggest that the populations varied, with a period of about 5 years. This variation is superimposed on the dominating change of the population. The temporal trends were analysed using discrete Fourier transform and by analysis of the autocorrelation function. Although not all of these results were statistically significant, the available information suggests that there could be a periodic variation with a period of about 5 years, since signs of periodicity are seen in the analyses and similar signs are seen in census data from two different populations. A tentative explanation, based on existing theoretical studies, is given for why there would be a periodic variation in the Pochard population. It is suggested that random perturbations which lowers the breeding success causes a periodic population dynamic.

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Breeding in a den of thieves: pros and cons of nesting close to egg predators

et al. 2016

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Abstract. Breeding success of many Arctic-breeding bird populations varies with lemming cycles due to prey switching behavior of generalist predators. Several bird species breed on islands to escape from generalist predators like Arctic fox Vulpes lagopus, but little is known about how these species interact. We studied brent geese Branta bernicla bernicla that share islands with gulls (Larus spec.) in Taimyr, Siberia (Russia). On one hand, gulls are egg predators, which occasionally steal an egg when incubating geese leave the nest for foraging bouts. On the other hand, gulls import marine resources to the islands, enriching the soil with their guano. We considered three hypotheses regarding clutch size of brent geese after partial nest predation. According to the "predator proximity hypothesis", clutch size is expected to be smallest close to gulls, because of enhanced predator exposure. Conversely, clutch size is expected to be largest close to gulls, because of the supposedly better feeding conditions close to gulls, which might reduce nest recess times of geese and hence egg predation risk ("guano hypothesis"). Furthermore, gulls may defend their nesting territory, and thus nearby goose nests might benefit from this protection against other gulls ("nest association hypothesis"). We mapped goose and gull nests toward the end of the goose incubation period. In accordance with the latter two hypotheses, goose clutch size decreased with distance to the nearest gull nest in all but the lemming peak year. In the lemming peak year, clutch size was consistently high, indicating that partial nest predation was nearly absent. By mapping food quantity and quality, we found that nitrogen availability was indeed higher closer to gull nests, reflecting guanofication. Unlike predicted by the nest association hypothesis, a predation pressure experiment revealed that egg predation rate decreased with distance to the focal gull nests. We therefore propose that higher food availability close to gulls enables female geese to reduce nest recess time, limiting egg predation by gulls.

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Population dynamics of lemmings, Lemmus sibirica and Dicrostonyx torquatus, and Arctic Fox Alopex lagopus on the Taimyr peninsula, Siberia, 1960—2001

Cited by 16 publications

References 13 publications

The spring migration of Grey Plover Pluvialis squatarola in Sweden

The spring migration of Grey Plover Pluvialis squatarola in Sweden

Varierar brunand Aythya ferina periodiskt? – en analys av inventeringsresultat från Angarnsjöängen, Sverige, 1978—2003 och Engure, Lettland, 1972—1992

Breeding in a den of thieves: pros and cons of nesting close to egg predators

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