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  • What is clutch size and why do we study it? - NestWatch
    On average, within a species, birds lay smaller clutches when breeding at lower latitudes or at higher altitudes The topic of clutch size variation has been a source of fascination for generations of bird biologists
  • Latitudinal and seasonal patterns in clutch size of some single‐brooded . . .
    Our primary criteria for selecting species to include in our analysis were that the species is single‐brooded, exhibits intraspecific variation in clutch size, and is distributed throughout most of Great Britain (thus maximizing the latitudinal extent of the study)
  • Clutch size, incubation hatching
    Birds of nearly all species temporarily shed their feathers on single or paired areas of the breast or abdomen early in the breeding season The bare skin increases in vascularity, which aids it in transferring body heat for incubating the eggs and brooding the chicks
  • Latitudinal and seasonal patterns in clutch size of some single-brooded . . .
    Clutch size declines monotonically with laying date in single-brooded species, but in multi-brooded species clutch size initially increases, prior to declining as the season progresses (Crick et al 1993, Dhondt et al 2002)
  • Evolution of avian clutch size along latitudinal gradients: do . . .
    Birds display a latitudinal gradient in clutch size with smaller clutches in the tropics and larger in the temperate region Three factors have been proposed to affect this pattern: seasonality of resources (SR), nest predation and length of the breeding season (LBS)
  • Seasonal clutch size variation of multi-brooded bird species . . .
    Resident multi-brooded species show a mid-season peak of clutch size, with smaller clutches laid early and late in the season, whereas single-brooded species present the larger clutches at the onset of breeding and then a decrease as the season progresses (Lack 1954, Klomp 1970)
  • Variation in Clutch Sizes - web. stanford. edu
    Why do small species tend to have larger clutches than large species do? The quick answer to all of these questions is that birds lay the number of eggs that will permit them to produce the maximum number of offspring -- but that number varies with latitude, habitat, body size, etc
  • Seasonal clutch size variation of multi-brooded bird species . . .
    Single-brooded species start with a maximum clutch size that declines continuously as the season progresses, whereas the clutch sizes of multi-brooded species usually increase to a mid-season
  • Avian clutch size - Wikipedia
    David Lack observed a direct relationship between latitude and avian clutch size [1] Comparable bird species near the equator laid approximately half as many eggs as those that resided in northern temperate habitats [1] He observed an increasing clutch-size from the equator towards the poles (something he referred to as the “latitude trend”) for many passerine (perching) birds, near
  • Seasonal Changes in Clutch Size in British Birds - JSTOR
    We conclude that multi-brooded species are selected to start laying early, so that the first young hatch before conditions are optimal for raising nestlings, while single-brooded species await better conditions





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