Mortality rate and population density regulation in the great tit, Parus major L.: A review

The pandemic caused by COVID-19 has left millions infected and dead around the world, with Latin America being one of the most affected areas. In this work, we have sought to determine, by means of a multiple regression analysis and a study of correlations, the influence of population density, life expectancy, and proportion of the population in vulnerable employment, together with GDP per capita, on the mortality rate due to COVID-19 in Latin American countries. The results indicated that countries with higher population density had lower numbers of deaths. Population in vulnerable employment and GDP showed a positive influence, while life expectancy did not appear to significantly affect the number of COVID-19 deaths. In addition, the influence of these variables on the number of confirmed cases of COVID-19 was analyzed. It can be concluded that the lack of resources can be a major burden for the vulnerable population in combating COVID-19 and that population density can ensure better designed institutions and quality infrastructure to achieve social distancing and, together with effective measures, lower death rates.

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Anyone listening? No evidence for eavesdropping on male singing interactions in the great tit, Parus major

Animal Behaviour ◽

10.1016/j.anbehav.2021.03.009 ◽

2021 ◽

Vol 176 ◽

pp. 67-76

Author(s):

Nina Bircher ◽

Kees van Oers ◽

Marc Naguib

Keyword(s):

Parus Major ◽

Great Tit

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The Significance of Antecedent Auditory Experiences on Later Reactions to the ‘Seeet’ Alarm-Call in Great Tit Nestlings Parus major

Zeitschrift für Tierpsychologie ◽

10.1111/j.1439-0310.1978.tb01844.x ◽

2010 ◽

Vol 47 (4) ◽

pp. 396-409 ◽

Cited By ~ 13

Author(s):

Olof Rydén

Keyword(s):

Parus Major ◽

Alarm Call ◽

Great Tit

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First record of Diplotriaena henryi Blanc, 1919 from the coal tit, Parus ater with new report from the great tit, Parus major in the Middle East

Helminthologia ◽

10.2478/s11687-006-0045-6 ◽

2006 ◽

Vol 43 (4) ◽

pp. 239-241

Author(s):

I. Mobedi ◽

M. Sehhatisabet ◽

E. Razmjou ◽

S. Shafiei

Keyword(s):

Middle East ◽

Parus Major ◽

First Record ◽

Great Tit ◽

Northern Iran ◽

Coal Tit ◽

Parus Ater

AbstractSeven males and thirteen female Diplotriaena henryi Blanc 1919 were collected from body cavities (heart, sternum, and chest) of tits (one Parus major and three Parus ater) in plain woodland of Noor, in Northern Iran.

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Effect of Calcium Availability and Habitat Quality on Reproduction in Pied Flycatcher Ficedula hypoleuca and Great Tit Parus major

Journal of Avian Biology ◽

10.2307/3677010 ◽

1999 ◽

Vol 30 (4) ◽

pp. 383 ◽

Cited By ~ 47

Author(s):

V. Tilgar ◽

R. Mand ◽

A. Leivits

Keyword(s):

Habitat Quality ◽

Parus Major ◽

Ficedula Hypoleuca ◽

Great Tit ◽

Pied Flycatcher ◽

Calcium Availability

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Degradation of Great Tit (Parus Major) Song Before And After Foliation: Implications for Vocal Communication in a Deciduous Forest

Behaviour ◽

10.1163/1568539042360152 ◽

2004 ◽

Vol 141 (8) ◽

pp. 935-958 ◽

Cited By ~ 53

Author(s):

Sandra Blumenrath ◽

Torben Dabelsteen

Keyword(s):

Information Transfer ◽

Structural Changes ◽

Vocal Communication ◽

Deciduous Forest ◽

Parus Major ◽

Great Tit ◽

Transmission Experiment ◽

Distance Information ◽

Before And After ◽

The Impact

AbstractSongbirds living in temperate forests experience great seasonal changes in habitat acoustics during the part of the breeding season when singing activity is high. These changes, which are brought about by accelerated vegetation growth and leaf burst in spring, affect sound propagation and potentially render vocal communication more difficult as the total number of scattering and absorbing obstacles increases. We investigated this in a sound transmission experiment in which representative great tit (Parus major) songs were broadcast in a typical forest habitat before and after foliation. Speaker and microphone were placed at natural separation distances and in typical sender and receiver positions. For each song note we quantified several aspects of sound degradation and found that they all increased considerably when leaves were present. Before foliation the same amount of degradation would only be obtained by doubling the transmission distance, i.e. foliage shortens the active space of great tit song. This inevitably alters distance information, provided that distance-dependent, structural changes of received songs are used as ranging cues. Moreover, sender and receiver positions within the canopy become unfavourable compared to heights just below the canopy when the aim is to maximise song propagation distances. Altogether, the presence of foliage greatly affects the potential for vocal information transfer in great tits and requires behavioural and/or perceptual adjustment of the communicating individuals to counteract or reduce the impact of foliage on signal degradation.

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