Fletta eftir höfundi "Jónsson, Jón Einar"

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Do foraging methods in winter affect morphology during growth in juvenile snow geese?

Jónsson, Jón Einar; Afton, Alan D. (Wiley-Blackwell, 2016-10-05)

Physical exertion during growth can affect ultimate size and density of skeletal structures. Such changes from different exercise regimes may explain morphological differences between groups, such as those exhibited by lesser snow geese (Chen caerulescens ...
The early birds and the rest: do first nesters represent the entire colony?

Jónsson, Jón Einar; Lúðvíksson, Smári J.; Kaller, Michael D. (Springer Nature, 2016-06-02)

Climate change studies have detected earlier spring arrival of breeding birds. However, first nest dates (date first nests were found), which commonly provide the metric for earlier arrival, can be biased by population size or sampling effort. Our aims ...
Numbers and distribution of the Great Cormorant in Iceland: Limitation at the regional and metapopulation level

Gardarsson, Arnthor; Jónsson, Jón Einar (Wiley, 2019-03-12)

We studied a metapopulation of great cormorant (Phalacrocorax carbo) in Iceland, using complete aerial censuses of nests in 25 years during 1975–2015. Age composition was estimated in 1998–2014 by ground surveys in September and February. Brood size ...

Atriði 1-3 af 3

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