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305. Gut microbiota influences female choice and fecundity in the nuptial gift-giving species, Drosophila subobscura (Diptera: Drosophilidae)

Creator:
Walsh, Benjamin S., Heys, Chloe, and Lewis, Zenobia
Format:
print, počítač, and online zdroj
Type:
article, články, journal articles, model:article, and TEXT
Subject:
Zoologie, dvoukřídlí, octomilkovití, Diptera, Drosophilidae, Drosophila subobscura, microbiota, gut bacteria, mate preference, reproductive success, 2, and 59
Language:
English
Description:
Recently, there has been rapidly growing interest in the effects of the microbiota on host physiology and behaviour. Due to the nutritional value of bacteria, gut microflora may be particularly important in species that present nuptial gifts during courtship. Here, we explore whether the presence or absence of gut microbiota in males and females of the nuptial gift-giving species Drosophila subobscura (Collin, 1936) alters mating behaviour in terms of female preference, male investment, and female fecundity. We found that females that had been fed antibiotics, compared to females with intact gut bacteria, were more willing to mate with a male that had been fed normally. However female fecundity was higher when both males and females lacked gut bacteria compared to both individuals having a full complement of gut bacteria. This implies that the presence of the microbiota acts to reduce female fecundity in this species, and that male gut bacterial content influences female fecundity. Our results provide further evidence to the growing consensus that the microbiota of an individual may have important effects on both reproductive behaviour and physiology, and suggest that it may also contribute to the nutritional value of the nuptial gift in this system., Benjamin S. Walsh, Chloe Heys, Zenobia Lewis., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

307. Habitat use of the mistle thrush (Turdus viscivorus): the importance of urban areas and permanent crops

Creator:
Chiatante, Gianpasquale
Format:
počítač and online zdroj
Type:
model:article and TEXT
Subject:
Turdidae, olive orchards, vineyards, MaxEnt, downslope shift, and Mediterranean Basin
Language:
English
Description:
The mistle thrush is a species that occurs in old-growth forests, especially coniferous forests, in hilly and mountain areas and avoids warm and dry areas and human settlements. Despite this, in recent decades, the mistle thrush has colonised Apulia, southern Italy's lowlands and coasts, in rural and urban contexts. This study investigates the habitat selection of this species in central Apulia, in both the breeding season and winter, by carrying out 301 point counts and 264 linear transects. Data were collected to build a Species Distribution Model (SDM) for each season with the MaxEnt algorithm and the regional land use map, selecting variables through the Akaike Information Criterion. Overlap in the suitability of both seasons was measured using Schoener's D. A total of 133 observations of mistle thrush were noted during the breeding season and 85 observations during winter. During the breeding season, the mistle thrush selected olive orchards, especially those near vineyards and urban areas, where it could find food and safe places to nest. In this period, however, it was also found in coniferous woodlands. The mistle thrush also used vineyards in winter, whereas it avoided urban areas in this period, possibly due to food scarcity. Non-irrigated arable lands were avoided all year round, whereas natural grasslands were only avoided during the winter. Irrigated arable lands positively affected the species. Furthermore, 60% of habitat characteristics were similar between the breeding and winter seasons. It is unclear what makes the mistle thrush shift its range southward and downslope. However, it is likely due to the general increase in forest cover, a positive rainfall trend in Central Italy during summer, and the absence of competition with similar species in central Apulia.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

309. Harmonia axyridis (Coleoptera: Coccinellidae): Smelling the rat in native ladybird declines

Creator:
John J. Sloggett
Format:
print, počítač, and online zdroj
Type:
article, články, journal articles, model:article, and TEXT
Subject:
Zoologie, brouci, slunéčkovití, slunéčko východní, urbanizace, beetles, Coccinellidae, Harmonia axyridis, urbanization, Coleoptera, Adalia bipunctata, alien invasive, habitat compression, native species decline, 2, and 59
Language:
English
Description:
In the last two decades a huge amount of research has focused on the invasive harlequin ladybird, Harmonia axyridis, particularly on potential or actual deleterious effects that have arisen after it has colonised new regions. A focus of this work has been real or anticipated declines in native ladybird abundance since the introduction of H. axyridis, for which it is deemed responsible. Scientists have generally painted a very bleak picture of the effects of H. axyridis on native species: in this paper I argue that the picture painted is often too bleak. I use the case of the 2-spot ladybird, Adalia bipunctata, the species most often invoked as threatened by H. axyridis, to illustrate my point. While there is little question that H. axyridis has led to a decline in A. bipunctata populations in Europe, it seems likely that prior to the invasive ladybird's arrival A. bipunctata occurred in artificially high numbers in the urban environments in which it was typically studied. Pollution in towns and cities led to enhanced numbers of prey aphids on plants there which initially favoured A. bipunctata, and later H. axyridis. Thus one species, A. bipunctata, that has benefitted from an association with humans has been replaced by another, H. axyridis, just as brown rats replaced black rats in Europe and North America. Viewed with a longer perspective, A. bipunctata has more likely declined back to pre-industrial levels: the artificially high level from which it has declined recently was not a 'natural' one, and thus its decline from this level does not imply that it is now threatened or endangered. More broadly, we need a wider perspective, encompassing other ladybirds, longer timeframes and better comparisons with other (non-ladybird) invasive species to more clearly assess whether H. axyridis really poses as much of a threat as is often proposed., John J. Sloggett., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

310. Harry Harlow - mezi obdivem a odporem

Creator:
Koutná, Veronika and Vobořil, Dalibor
Format:
počítač and online zdroj
Type:
model:article and TEXT
Subject:
Harry Harlow, biography, Primate Lab, surrogate mothers, ethics, biografie, náhradní matky, and etika
Language:
Czech
Description:
This article aims to commemorate the lifelong work of Harry Harlow (31.10. 1905 – 6. 12. 1981) on the occasion of the 40th anniversary of his death. Although Harry Harlow is best known mainly for his experiments with maternal separation and social isolation, his research in the field of cognitive abilities of primates also received great scientific acclaim. The results of his work contributed to the revolution in childcare as well as to the shift in the prevailing approaches of psychology, but the ethics of his experiments is questionable from the contemporary point of view. and Článek připomíná celoživotní dílo Harryho Harlowa (31. 10. 1905 – 6. 12. 1981) u příležitosti 40. výročí jeho úmrtí. Ačkoli se Harry Harlow zapsal do povědomí zejména svými experimenty s mateřskou separací a sociální izolací, velkého vědeckého ohlasu se dočkal i jeho výzkum kognitivních schopností primátů. Výsledky jeho práce přispěly k revoluci v péči o děti i k posunu v převládajících směrech psy-chologie, jeho experimenty jsou však z dneš-ního pohledu etiky psychologického výzkumu velmi problematické.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

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