Parental provisioning behaviour in Pied FlycatchersFicedula hypoleucais well adjusted to local conditions in a mosaic of deciduous and coniferous habitat

Bird Study ◽  
2010 ◽  
Vol 57 (4) ◽  
pp. 447-457 ◽  
Author(s):  
Elo Sisask ◽  
Raivo Mänd ◽  
Marko Mägi ◽  
Vallo Tilgar
2013 ◽  
Vol 280 (1764) ◽  
pp. 20131019 ◽  
Author(s):  
A. Mutzel ◽  
N. J. Dingemanse ◽  
Y. G. Araya-Ajoy ◽  
B. Kempenaers

Repeatable behavioural traits (‘personality’) have been shown to covary with fitness, but it remains poorly understood how such behaviour–fitness relationships come about. We applied a multivariate approach to reveal the mechanistic pathways by which variation in exploratory and aggressive behaviour is translated into variation in reproductive success in a natural population of blue tits, Cyanistes caeruleus . Using path analysis, we demonstrate a key role for provisioning behaviour in mediating the link between personality and reproductive success (number of fledged offspring). Aggressive males fed their nestlings at lower rates than less aggressive individuals. At the same time, their low parental investment was associated with increased female effort, thereby positively affecting fledgling production. Whereas male exploratory behaviour was unrelated to provisioning behaviour and reproductive success, fast-exploring females fed their offspring at higher rates and initiated breeding earlier, thus increasing reproductive success. Our findings provide strong support for specific mechanistic pathways linking components of behavioural syndromes to reproductive success. Importantly, relationships between behavioural phenotypes and reproductive success were obscured when considering simple bivariate relationships, underlining the importance of adopting multivariate views and statistical tools as path analysis to the study of behavioural evolution.


2019 ◽  
Vol 50 (11) ◽  
Author(s):  
Paweł Podkowa ◽  
Katarzyna Malinowska ◽  
Adrian Surmacki

1977 ◽  
Vol 38 (02) ◽  
pp. 0399-0406 ◽  
Author(s):  
Peter N. Walsh ◽  
Richard E. Goldberg ◽  
Richard L. Tax ◽  
Larry E. Magargal

SummaryTo determine whether platelets play a role in the pathogenesis of retinal vein occlusion (RVO), platelets and coagulation were evaluated in 28 patients with RVO. Platelet coagulant activities concerned with the initiation and early stages of intrinsic coagulation were 2–4 fold increased in 9 patients with acute primary RVO but not in patients with acute secondary (10 patients) or chronic (9 patients) RVO. Platelet factor 3 activity, platelet aggregation, serotonin release by platelets and plasma coagulation were normal in all patients. Platelets may provide a trigger mechanism for venous thrombosis in the eye when local conditions permit.


2005 ◽  
Vol 35 (140) ◽  
pp. 379-392
Author(s):  
Helmut Dietrich

Poland accepted the alien and asylum policy of the European Union. But what does it mean, in the face of the fact that most of the refugees don´t want to sojourn a lot of time in Poland, but want to join their families or friends in Western Europe? How the transfer of policies does work, if the local conditions are quite different than in Germany or France? The answer seems to be the dramatization of the refugee situation in Poland, especially the adoption of emergency measures towards refugees of Chechnya.


2016 ◽  
pp. 91-118
Author(s):  
Peter Black

The Sonderdienst (Special Service) was an enforcement agency developed by German SS and Police authorities, specifically in the Lublin District of the so called Government General (central and southeastern German-occupied Poland) to assist in enforcing German occupation ordinances in the cities and particularly in the countryside, where lack of police personnel, ignorance of local conditions, and perceived fear of partisan attack discouraged a direct German police presence. After February 1941, the SS and Police relinquished control over the Sonderdienst to the German civilian occupation authorities. Under civilian authority, the Sonderdienst was deployed at the Kreis level, under command of the so-called German Stadt- and Kreishauptmänner in detachments of approximately 30 men to carry out administrative enforcement activities when the civilian authorities were unable to count or SS and police support. This article examines how the Sonderdienst highlights the dependence of German administration in the Government General on locally recruited auxiliaries, particularly in the countryside. The Sonderdienst was conceived, developed, expanded, and deployed within the context of a bitter battle between German civilian authorities and the SS/police apparatus over control of local executive police power. This is hardly new; yet the Government General is unusual in that the German civilian authorities were able to fight the SS to a draw on this issue. Since its formation followed the recruitment of the “ethnic” and ideological “cream” of the ethnic German population of occupied Poland into agencies such as the Selbstschutz, and the Waffen SS, the Sonderdienst represents an early effort of the National Socialist authorities to fashion an ethnically conscious and ideologically committed corps from young men of questionable, even dubious, German ancestry and heritage. Finally, this study reveals not only the complicity of the civilian authorities in Nazi crimes, but the link in German-occupied Poland between “routine” administrative duties, such as collecting fines for ordinance violations, and the brutal persecution and annihilation of groups targeted as enemies of the German Reich, such as the Polish Jews. Civilian administrators and SS and police authorities shared the “National Socialist consensus” in occupied Poland. They wanted to annihilate the Jews and the Polish intelligentsia, to exploit the labor potential of the Polish masses, and to turn the Government General into a region of German settlement. As a part of this vision, the Sonderdienst was to serve not only as a police executive, but as a political and cultural steppingstone to full acceptance into the German “racial community.” There is no question that, even in “routine” duties, the Sonderdienst participated, more or less willingly, in the implementation of the most evil racist policies of the National Socialist regime.


2019 ◽  
Author(s):  
Joel L Pick ◽  
Nyil Khwaja ◽  
Michael A. Spence ◽  
Malika Ihle ◽  
Shinichi Nakagawa

We often quantify a behaviour by counting the number of times it occurs within a specific, short observation period. Measuring behaviour in such a way is typically unavoidable but induces error. This error acts to systematically reduce effect sizes, including metrics of particular interest to behavioural and evolutionary ecologists such as R2, repeatability (intra-class correlation, ICC) and heritability. Through introducing a null model, the Poisson process, for modelling the frequency of behaviour, we give a mechanistic explanation of how this problem arises and demonstrate how it makes comparisons between studies and species problematic, because the magnitude of the error depends on how frequently the behaviour has been observed (e.g. as a function of the observation period) as well as how biologically variable the behaviour is. Importantly, the degree of error is predictable and so can be corrected for. Using the example of parental provisioning rate in birds, we assess the applicability of our null model for modelling the frequency of behaviour. We then review recent literature and demonstrate that the error is rarely accounted for in current analyses. We highlight the problems that arise from this and provide solutions. We further discuss the biological implications of deviations from our null model, and highlight the new avenues of research that they may provide. Adopting our recommendations into analyses of behavioural counts will improve the accuracy of estimated effect sizes and allow meaningful comparisons to be made between studies.


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