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What if Eurasian jay Garrulus glandarius would larder acorns instead of scatter them?

Przemyslaw Kurek (1)   , Dorota Dobrowolska (2), Blanka Wiatrowska (3), Lukasz Dylewski (4)

iForest - Biogeosciences and Forestry, Volume 11, Issue 5, Pages 685-689 (2018)
doi: https://doi.org/10.3832/ifor2793-011
Published: Oct 23, 2018 - Copyright © 2018 SISEF

Research Articles


Jays usually store acorns at separate sites, but in some cases a part of jay’s caches consists of more than one acorn. Storing acorns separately (scatter hoarding) or in clusters (larder hoarding) seems to be an important factor for further survival of seeds and seedlings. Scatter hoarding is favorable for jays, but what would happen if jays prepared caches consisting of more than one acorn? We put a following question: what is the importance and impact of acorn concentration per cache for the seedlings’ mortality and their growth characteristics? In 2013 an experimental plot was established. 1400 acorns of Quercus robur L. were sewed in 600 holes in three combinations called growing mode - singly, in twos and in fours. The mortality of seedlings depended on growing mode (Z = 6.24, P < 0.001) and year (Z = -2.42, P = 0.016). In the third year of the experiment the mortality of seedlings growing from acorns sewed in fours reached almost 90%, while in the case of seedlings growing separately the mortality was stable, reaching no more than 23%. Both growing mode (F = 26.49, P < 0.001) and year (F = 52.59, P < 0.001) had a significant impact on seedling growth increment. Seedlings growing in fours had a significantly higher growth increment than these growing separately and in twos. We concluded that seedlings growing separately had a higher survival rate, but lower growth increment than those coming from acorns sewed in clumps.

  Keywords


Eurasian Jay, Acorns, Scatter Hoarding, Larder Hoarding, Seedlings Survival, Seed Dispersal

Authors’ address

(1)
Przemyslaw Kurek
Department of Plant Ecology and Environmental Protection, Adam Mickiewicz University, Umultowska 89, 61-614 Poznan (Poland)
(2)
Dorota Dobrowolska
Department of Forest Ecology, Forest Research Institute, Braci Lesnej 3, 05-090 Sekocin Stary (Poland)
(3)
Blanka Wiatrowska
Department of Forest Botany, Poznan University of Life Sciences, Wojska Polskiego 71D, Poznań 60-625 (Poland)
(4)
Lukasz Dylewski
Institute of Zoology, Poznan University of Life Sciences, Wojska Polskiego 71C, Poznan 60-625 (Poland)

Corresponding author

 
Przemyslaw Kurek
przkur1@amu.edu.pl

Citation

Kurek P, Dobrowolska D, Wiatrowska B, Dylewski L (2018). What if Eurasian jay Garrulus glandarius would larder acorns instead of scatter them?. iForest 11: 685-689. - doi: 10.3832/ifor2793-011

Academic Editor

Massimo Faccoli

Paper history

Received: Mar 20, 2018
Accepted: Aug 02, 2018

First online: Oct 23, 2018
Publication Date: Oct 31, 2018
Publication Time: 2.73 months

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