Laying date and clutch size of Great Tits(Parus major) in the Mediterranean region: a comparison of four habitat types

1998 ◽  
Vol 139 (3) ◽  
pp. 269-276 ◽  
Author(s):  
Eduardo J. Beldal ◽  
Emilio Barba ◽  
José A. Gil-Delgado ◽  
Domingo J. Iglesias ◽  
Germán M. López ◽  
...  
Keyword(s):  
Clutch Size ◽  
Mediterranean Region ◽  
Parus Major ◽  
Laying Date ◽  
Habitat Types ◽  
The Mediterranean

scholarly journals Talgoxens Parus major antal och häckningsbiologi – resultat av 25 års holkstudier

Ornis Svecica ◽  
2011 ◽  
Vol 21 (2–4) ◽  
pp. 123-132
Author(s):  
Jan Eric Nilsson
Keyword(s):  
Population Size ◽  
Clutch Size ◽  
Recent Trend ◽  
Parus Major ◽  
Laying Date ◽  
Positive Trend ◽  
Significant Positive Trend ◽  
Nest Box ◽  
Nest Boxes ◽  
Minimum Number

A nest-box population of Great Tits Parus major was followed in 1986–2010. Maximum number of breeding attempts was three times higher than the minimum number but there was no significant trend through 2005. The number of nest-boxes declined from 94 to 55 during the last five years making it difficult to interpret the recent trend but most likely there was an increase. 17% of the first breeding attempts failed and resulted in replacement clutches. The number of second clutches was 13% of the number of first clutches. There was no correlation between population size and winter temperature. There was no significant advancement of laying date in spite of the fact laying date was correlated with April temperature and that local April temperature showed a significant positive trend during the study period. Mean clutch size was 9.2 eggs. The number of fledglings was 4.65, which is low compared to other studies. Replacement and second clutches produced 4.37 fledglings. Both clutch size and number of fledglings declined during the study period.

Family Planning in the Great Tit (Parus Major): Optimal Clutch Size as Integration of Parent and Offspring Fitness

Behaviour ◽  
1990 ◽  
Vol 114 (1-4) ◽  
pp. 161-190 ◽  
Author(s):  
Joost M. Tinbergen ◽  
Serge Daan
Keyword(s):  
Clutch Size ◽  
Natural Variation ◽  
Parus Major ◽  
Recruitment Rate ◽  
Reproductive Value ◽  
Laying Date ◽  
Apparent Contradiction ◽  
Population Mean ◽  
Individual Fitness ◽  
Second Clutch

AbstractFitness variations due to natural variation in the size of the first clutch and its laying date were estimated using Fisher's reproductive value for both the clutch (Vc) and the parent (Vp) in a population of great tits. In order to test the hypothesis that individual birds maximize their reproductive value by the choice of clutch size, artificial variation in brood size was introduced and the consequences in terms of reproductive value estimated. Maximal Vc, computed on the basis of natural variation in clutch size, occurred at a clutch size of 15.2, and increased slightly with laying date (Fig. 1A) Vp increased with natural variation in clutch size and decreased with date (Fig. 1B). The total reproductive value V (= Vc+Vp) was maximal at a clutch size of 15.4 (Fig. 1C), substantially higher than the population mean clutch size (9.2). The components of the reproductive value of the clutch (Vc) that were negatively affected by manipulation were the survival of the nestlings and the recruitment rate. The reproductive value of the parent (Vp) was negatively affected only through the probability of having a second clutch. Maximal Vc computed on basis of artificial variation in clutch size, occurred at a clutch size of 10.0, and also increased with date (Fig. 1D). Vp decreased with artificial variation in clutch size (Fig. 1E causing the clutch size maximising reproductive value V to shift to a value of 9.4 (Figs 1F, 3), very close to the population mean clutch size (9.2). It is concluded that the majority of great tits produces the number of eggs (9-10) that maximizes their individual fitness, even though those individual birds laying 15 eggs have the highest reproductive value in the population. The fact that birds laying very large clutches have the highest reproductive value points in the direction of a selection pressure towards larger clutches. Yet, over the last 30 years clutch sizes have not increased in the study population. This apparent contradiction is discussed. Either no genetic variation in clutch size is involved, or a complex polymorphism exists.

Existing areas and past changes of wetland extent in the Mediterranean region: an overview

2012 ◽  
Vol 38 (2) ◽  
pp. 53-66 ◽  
Author(s):  
Christian Perennou ◽  
Coralie Beltrame ◽  
Anis Guelmami ◽  
Pere Tomàs Vives ◽  
Pierre Caessteker
Keyword(s):  
Mediterranean Region ◽  
Wetland Extent ◽  
The Mediterranean

AFLP analysis of genetic diversity in Turkish green plum accessions (Prunus cerasifera L.) adapted to the Mediterranean region

2007 ◽  
Vol 114 (4) ◽  
pp. 263-267 ◽  
Author(s):  
H. Ayanoğlu ◽  
S. Bayazit ◽  
G. İnan ◽  
M. Bakır ◽  
A.E. Akpınar ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Mediterranean Region ◽  
Aflp Analysis ◽  
Prunus Cerasifera ◽  
The Mediterranean
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