scholarly journals Opposite differential allocation by males and females of the same species

2013 ◽  
Vol 9 (1) ◽  
pp. 20120835 ◽  
Author(s):  
Tobias Limbourg ◽  
A. Christa Mateman ◽  
C. M. Lessells
Keyword(s):  
Biparental Care ◽  
Differential Allocation ◽  
Parental Effort ◽  
Feeding Rates ◽  
Experimental Protocol ◽  
Cyanistes Caeruleus ◽  
Males And Females ◽  
First Time ◽  
Blue Tits ◽  
Uv Coloration

Differential allocation (DA)—the adjustment of an individual's parental investment in relation to its mate's attractiveness—is increasingly recognized as an important component of sexual selection. However, although DA is expected by both sexes of parents in species with biparental care, DA by males has rarely been investigated. We have previously demonstrated a decrease in the feeding rates of female blue tits Cyanistes caeruleus when their mate's UV coloration was experimentally reduced (i.e. positive DA). In this study, we used the same experimental protocol in the same population to investigate DA by male blue tits in relation to their female's UV coloration. Males mated to UV-reduced females had higher feeding rates than those mated to control females (i.e. negative DA). Thus, male and female blue tits display opposite DA for the same component of parental effort (chick provisioning), the first time that this has been reported for any species.

scholarly journals Prey selectivity and parental feeding rates of Blue Tits Cyanistes caeruleus in relation to nestling age

Bird Study ◽  
2012 ◽  
Vol 59 (2) ◽  
pp. 236-242 ◽  
Author(s):  
Vicente García-Navas ◽  
Esperanza S. Ferrer ◽  
Juan José Sanz
Keyword(s):  
Prey Selectivity ◽  
Feeding Rates ◽  
Cyanistes Caeruleus ◽  
Parental Feeding ◽  
Blue Tits

Male sexual attractiveness and parental effort in blue tits: a test of the differential allocation hypothesis

2005 ◽  
Vol 70 (4) ◽  
pp. 877-888 ◽  
Author(s):  
Arild Johnsen ◽  
Kaspar Delhey ◽  
Emmi Schlicht ◽  
Anne Peters ◽  
Bart Kempenaers
Keyword(s):  
Sexual Attractiveness ◽  
Differential Allocation ◽  
Parental Effort ◽  
Blue Tits

The importance of pair duration and biparental care to reproductive success in the monogamous Australian magpie-lark

1999 ◽  
Vol 47 (5) ◽  
pp. 439 ◽  
Author(s):  
Michelle L. Hall
Keyword(s):  
Reproductive Success ◽  
Parental Care ◽  
Biparental Care ◽  
Feeding Rates ◽  
Previous Season ◽  
Socially Monogamous ◽  
First Clutch ◽  
Breeding Attempt ◽  
First Time ◽  
Australian Magpie

Biparental care is common in birds, where monogamy is the predominant mating system. Australian magpie-larks (Grallina cyanoleuca) are socially monogamous, and relatively unusual among passerines in the extent to which parental care is shared. Males contributed as much or more to parental care as females, sharing nest-building, incubation, brooding and feeding of nestlings and fledglings. Biparental care was thus important to survival of offspring, and probably constrained partners to stay together thoughout a breeding attempt. However, partners usually remained together longer. Pairs that had bred together in the previous season tended to lay their first clutch earlier, were more likely to fledge two broods in the season, and had higher annual reproductive success than pairs breeding together for the first time. Females benefitted from staying with a male they had bred with previously, as females in established pairs decreased their feeding rates and their partners compensated to some extent. Differences between new and established pairs may have been due to the effects of the age and experience of each partner, or to pair duration, or both. Divorce rates were low, consistent with benefits associated with staying together, but also with high costs of divorce as year-round territoriality probably limited opportunities for taking different partners.

scholarly journals Phosphatidylserine-Gold Nanoparticles (PS-AuNP) Induce Prostate and Breast Cancer Cell Apoptosis

Pharmaceutics ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1094
Author(s):  
Allan Radaic ◽  
Nam E. Joo ◽  
Soo-Hwan Jeong ◽  
Seong-II Yoo ◽  
Nicholas Kotov ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Gold Nanoparticles ◽  
Biomedical Applications ◽  
Therapeutic Potential ◽  
Control Treatment ◽  
Track Record ◽  
Males And Females ◽  
Breast And Prostate Cancer ◽  
First Time

Prostate and breast cancer are the current leading causes of new cancer cases in males and females, respectively. Phosphatidylserine (PS) is an essential lipid that mediates macrophage efferocytosis and is dysregulated in tumors. Therefore, developing therapies that selectively restore PS may be a potential therapeutic approach for carcinogenesis. Among the nanomedicine strategies for delivering PS, biocompatible gold nanoparticles (AuNPs) have an extensive track record in biomedical applications. In this study, we synthesized biomimetic phosphatidylserine-caped gold nanoparticles (PS-AuNPs) and tested their anticancer potential in breast and prostate cancer cells in vitro. We found that both cell lines exhibited changes in cell morphology indicative of apoptosis. After evaluating for histone-associated DNA fragments, a hallmark of apoptosis, we found significant increases in DNA fragmentation upon PS-AuNP treatment compared to the control treatment. These findings demonstrate the use of phosphatidylserine coupled with gold nanoparticles as a potential treatment for prostate and breast cancer. To the best of our knowledge, this is the first time that a phosphatidylserine-capped AuNP has been examined for its therapeutic potential in cancer therapy.

scholarly journals Tri-axial accelerometry shows differences in energy expenditure and parental effort throughout the breeding season in long-lived raptors

2021 ◽  
Author(s):  
Pascual LÓPEZ-LÓPEZ ◽  
Arturo M PERONA ◽  
Olga EGEA-CASAS ◽  
Jon ETXEBARRIA MORANT ◽  
Vicente URIOS
Keyword(s):  
Energy Expenditure ◽  
Parental Care ◽  
Breeding Season ◽  
Video Recording ◽  
Experimental Manipulation ◽  
Biparental Care ◽  
Breeding Ecology ◽  
Parental Effort ◽  
Ecological Data ◽  
Movement Trajectories

Abstract Cutting-edge technologies are extremely useful to develop new workflows in studying ecological data, particularly to understand animal behaviour and movement trajectories at the individual level. Although parental care is a well-studied phenomenon, most studies have been focused on direct observational or video recording data, as well as experimental manipulation. Therefore, what happens out of our sight still remains unknown. Using high-frequency GPS/GSM dataloggers and tri-axial accelerometers we monitored 25 Bonelli’s eagles (Aquila fasciata) during the breeding season to understand parental activities from a broader perspective. We used recursive data, measured as number of visits and residence time, to reveal nest attendance patterns of biparental care with role specialization between sexes. Accelerometry data interpreted as the Overall Dynamic Body Acceleration, a proxy of energy expenditure, showed strong differences in parental effort throughout the breeding season and between sexes. Thereby, males increased substantially their energetic requirements, due to the increased workload, while females spent most of the time on the nest. Furthermore, during critical phases of the breeding season, a low percentage of suitable hunting spots in eagles’ territories led them to increase their ranging behaviour in order to find food, with important consequences in energy consumption and mortality risk. Our results highlight the crucial role of males in raptor species exhibiting biparental care. Finally, we exemplify how biologging technologies are an adequate and objective method to study parental care in raptors as well as to get deeper insight into breeding ecology of birds in general.

scholarly journals A review of the Sarcophaga (Heteronychia) (Diptera: Sarcophagidae) of Sardinia

Zootaxa ◽  
2009 ◽  
Vol 2318 (1) ◽  
pp. 566-588 ◽  
Author(s):  
DANIEL WHITMORE
Keyword(s):  
Canary Islands ◽  
North Africa ◽  
Junior Synonym ◽  
Arthropod Diversity ◽  
Italian Regions ◽  
Males And Females ◽  
First Time

An account is given of the species of Sarcophaga Meigen, 1826 subgenus Heteronychia Brauer & Bergenstamm, 1889 known from the island of Sardinia (Italy). Most of the nearly 1,400 specimens examined were collected in the SW part of the island during 2003–2006 as part of a project investigating the arthropod diversity of the Monti Marganai and Montimannu areas (respectively Carbonia-Iglesias and Medio Campidano provinces). The study resulted in the finding of eight species of Heteronychia, six of which are recorded from Sardinia for the first time. Sarcophaga (Heteronychia) penicillata Villeneuve, 1907, previously mentioned in the literature, is excluded from the fauna of the island. Sarcophaga (Heteronychia) thirionae (Lehrer, 1976) is recorded for the first time from Europe and North Africa (Algeria). One species, Sarcophaga (Heteronychia) gabrielei sp. nov., from various sites in the limestone massif of Marganai, is described as new. Previously unpublished records from other Italian regions and from other countries (Algeria, Canary Islands, Greece) are also given for several species. Sarcophaga (Heteronychia) schnabli Villeneuve, 1911 is recognized as a junior synonym of S. (H.) consanguinea Rondani, 1860 syn. nov. The possible synanthropy of Sarcophaga (Heteronychia) pandellei (Rohdendorf, 1937) is briefly discussed. A key to males and females of all known Sardinian and Corsican species of Sarcophaga (Heteronychia) is provided.

scholarly journals Personality in Blue Tits (Cyanistes caeruleus) and its Effect on Their Breeding Success

Ethology ◽  
2016 ◽  
Vol 122 (8) ◽  
pp. 695-701 ◽  
Author(s):  
Claire Colchester ◽  
Nancy M. Harrison
Keyword(s):  
Breeding Success ◽  
Cyanistes Caeruleus ◽  
Blue Tits

scholarly journals Effect of tree logging on reproductive performance in Blue Tits (Cyanistes caeruleus)

2016 ◽  
Vol 158 (1) ◽  
pp. 339-344
Author(s):  
Seyed Mehdi Amininasab ◽  
Charles C. Y. Xu ◽  
Sjouke A. Kingma ◽  
Jan Komdeur
Keyword(s):  
Reproductive Performance ◽  
Cyanistes Caeruleus ◽  
Blue Tits

The Australian species of Aponomma and Amblyomma (Ixodoidea).

1953 ◽  
Vol 1 (1) ◽  
pp. 111 ◽  
Author(s):  
FHS Roberts
Keyword(s):  
New Species ◽  
Australian Species ◽  
Males And Females ◽  
First Time ◽  
Species Being

A study has been made of the Australian species of Aponomma and Amblyomma (Ixodoidea). Nine species of Aponomma were determined, namely A. trachysauri, A. hydrosauri, A. auruginans, A. decorosum, A. simplex, A. trimuculatum, A. tachyglossi, A, tropicum, and A. pulchrum, the last three species being new. Two previously described species, namely A. quadratum and A. ecinctum, were recognized among the material available for study. A detailed description given of each species together with essential figures. Keys to the males, females, and nymphs are included. Twelve species of Amblyomma were seen. Species previously described included A. moreliae, A. limbatum, A. albolimbatum, A. triguttatum, A. australiense, and A. papuanu. A. postoculatum and A. helvolum were not recognized among the material available for study. A. papuana is recorded from Australia for the first time. Four new species, namely A. sternne, A. echidnae, A. macropi, and A. moyi, are described. Keys to the males and females are given.

Sign in / Sign up

Export Citation Format

Share Document