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Dolenec, Zdravko
- Resource Allocation within the Replacement Clutch: do Female European Starling (Sturnus vulgaris Linneus) Adjust their Reproductive Strategy after a Full Clutch Loss?
Abstract Views :180 |
PDF Views:66
Authors
Affiliations
1 University of Applied Health Studies, Mlinarska St. 38, HR-10000 Zagreb, HR
2 Department of Pharmacology, School of Medicine, University of Rijeka, Brace Branchetta 20, HR-51000, Rijeka, HR
3 Department of Zoology, University of Zagreb, Rooseveltov trg 6, HR-10000 Zagreb, HR
4 Group for Terrestrial Biodiversity, Division of Biology, University of Zagreb, Marulicev trg 20/II, HR-10000 Zagreb, HR
1 University of Applied Health Studies, Mlinarska St. 38, HR-10000 Zagreb, HR
2 Department of Pharmacology, School of Medicine, University of Rijeka, Brace Branchetta 20, HR-51000, Rijeka, HR
3 Department of Zoology, University of Zagreb, Rooseveltov trg 6, HR-10000 Zagreb, HR
4 Group for Terrestrial Biodiversity, Division of Biology, University of Zagreb, Marulicev trg 20/II, HR-10000 Zagreb, HR
Source
Current Science, Vol 107, No 9 (2014), Pagination: 1597-1601Abstract
An important factor in the evolution of reproductive strategies in birds is the loss of a clutch or a brood. Many avian species produce a replacement clutch following the loss of the first clutch, but additional breeding effort carries physiological costs and can also reduce female fitness. Thus, egg production in replacement clutches is usually reduced. In contrast, European starling mothers seem to invest equally in their first and replacement clutches. This study investigated whether female starlings use differential allocation of resources to offspring, rather than egg production, to strategically balance investment and returns from the replacement clutch. By removing the first clutch, we induced females to lay a replacement clutch, and focused on covariation of egg size, embryo sex and laying order in both clutches. Results suggest that starling mothers created a pattern of resource allocation with laying order, but not with offspring sex, in the replacement clutch; whereas no pattern of resource allocation existed in the first clutch. This finding indicates that although starlings do not reduce egg production between first and replacement clutches, they may use other mechanisms to fine-tune their investment and maximize their fitness gains from the replacement clutch.Keywords
Egg Size, Laying Order, Reproductive Strategy, Replacement Clutch, Sex Ratio.Full Text
- Temporal Shift in Timing of Breeding of European Starling (Sturnus vulgaris Linnaeus) Population
Abstract Views :239 |
PDF Views:75
Authors
Affiliations
1 Department of Zoology, Faculty of Science, University of Zagreb, Rooseveltovtrg 6, HR-10000 Zagreb, HR
1 Department of Zoology, Faculty of Science, University of Zagreb, Rooseveltovtrg 6, HR-10000 Zagreb, HR
Source
Current Science, Vol 116, No 1 (2019), Pagination: 29-30Abstract
No Abstract.Keywords
No Keywords.Full Text
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Abstract Views :268 |
PDF Views:77
Authors
Affiliations
1 Department of Zoology, University of Zagreb, Rooseveltov trg 6, HR-10000 Zagreb, HR
1 Department of Zoology, University of Zagreb, Rooseveltov trg 6, HR-10000 Zagreb, HR
Source
Current Science, Vol 117, No 6 (2019), Pagination: 924-926Abstract
The average global climate is changing rapidly1 and increasing evidence indicates that global warming has consequences on numerous plant and animal species. Previous studies have shown significant fluctuations in the date advancement among wild species phenology in relation to warm springs. For instance, according to Szabó et al.2, four out of six investigated plant species in Hungary showed a significant advance in flowering dates by 1.9–4.4 days per decade, and the wood frog (Rana sylvatica) showed a trend toward earlier emergence by 19 days3. In bird species, these impacts often manifest in geographical distribution4, population size5, interaction between bird species and other species6, etc. However, long-term observations were mainly focused on spring migration7–9 and breeding phenology10,11 variations. Moreover, while most of the previous long-term monitorings were focused on interannual fluctuations of bird phenology in northern and western Europe, very few were conducted in southeastern Europe.Full Text
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