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Low frequencies of supernormal clutches in the Southern Dunlin and the Temminck's Stint

Artikel i vetenskaplig tidskrift
Författare V. M. Pakanen
Donald Blomqvist
T. Breiehagen
L. A. Flodin
O. Hilden
D. B. Lank
M. Larsson
T. Lislevand
K. Nuotio
P. Olsson
R. Ottvall
Angela Pauliny
H. Pehlak
A. Ronka
N. Ronka
D. Schamel
M. Soikkeli
R. L. Thomson
O. Thorup
P. Tomkovich
D. Tracy
K. Koivula
Publicerad i Ardea
Volym 107
Nummer/häfte 1
Sidor 61-74
ISSN 0373-2266
Publiceringsår 2019
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 61-74
Språk en
Länkar dx.doi.org/10.5253/arde.v107i1.a9
Ämnesord Calidris alpina schinzii, Calidris temminckii, enlarged clutch, intraspecific nest parasitism, quasi-, intraspecific nest parasitism, calidris-alpina-schinzii, brood, parasitism, mating system, size determination, population, predation, biology, limitation, strategies
Ämneskategorier Ekologi, Zoologi

Sammanfattning

Supernormal clutches are found across bird species. Such clutches often result from more than one female laying eggs in the same nest and can reflect different behaviours from parasitism to laying mistakes. Enlarged clutches are readily visible among waders due to a maximum maternal clutch size of four eggs, yet surprisingly little is known about this phenomenon. Since supernormal clutches are rare, large sample sizes are required to reliably quantify their natural frequencies. We used a large dataset to estimate the frequency of supernormal clutches in the polygamous Temminck's Stint Calidris temminckii and the monogamous Southern Dunlin C. alpina schinzii, and examine the timing of supernormal clutches in relation to the general distribution of nest initiation dates. While supernormal clutches were very rare, they were over four times more common in the Temminck's Stint (0.50%, n = 1594) than in the Southern Dunlin (0.11%, n = 2766). Dunlin show among the lowest frequency of supernormal clutches reported for waders. In the Temminck's Stint, supernormal clutches were found in the middle of the season, while in the Southern Dunlin such clutches occurred in late season replacement nests. The higher rate and timing of enlarged clutches in Temminck's Stints probably relates to the species' breeding system, which can include simultaneous courtship of multiple partners, but more work is needed to assess the relative influence of different factors. We argue that intraspecific nest parasitism is unlikely to be a primary reproductive tactic in small sandpipers.

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