scholarly journals A theoretical analysis of the energetic costs and consequences of parental care decisions

2002 ◽  
Vol 357 (1419) ◽  
pp. 331-340 ◽  
Author(s):  
J. N. Webb ◽  
T. Székely ◽  
A. I. Houston ◽  
J. M. McNamara
Keyword(s):  
Parental Care ◽  
Breeding Season ◽  
Programming Model ◽  
Average Duration ◽  
The Novel ◽  
Trade Offs ◽  
Consistent Manner ◽  
Future Reproduction ◽  
Dynamic Programming Model ◽  
Energetic Reserves

Should a parent care for its young or abandon them before they reach independence? We consider parental care behaviour as an adaptive decision, involving trade–offs between current and future reproduction. The condition of the parent is expected to influence these trade–offs. Using a dynamic programming model we explore how changes in the levels of energetic reserves, and time in the season, determine changes in parental care decisions. The novel feature of our model is that we have included the possibility of remating within the current breeding season in a consistent manner by explicitly modelling the behaviour of unmated animals. We show that there may be several fluctuations in the average duration of care during the breeding season. We also show that, because of the dependence of parental care behaviour on both the condition of the parent and time during the breeding season, changing some of the costs of care may increase the duration of care during one part of the season and decrease it at another. The model also shows that the conditions prevailing for animals with dependent offspring can affect the way in which an unmated animal behaves. For example, the behaviour of unmated animals may change to compensate (partly) for increases in the costs of raising offspring, which are produced at a later date (for example, by increasing the duration of foraging between breeding attempts). Overall, the model provides a good framework for understanding how various ecological and life–history variables should influence parental care behaviour during a breeding season.

Experimentally increased costs of parental care are shunted to offspring in species with extended care

2019 ◽  
Author(s):  
Gretchen F. Wagner ◽  
Emeline Mourocq ◽  
Michael Griesser
Keyword(s):  
Life History ◽  
Parental Care ◽  
Total Duration ◽  
Bird Species ◽  
Life History Strategy ◽  
Experimental Treatment ◽  
Cost Of Care ◽  
Adult Survival ◽  
Supporting Evidence ◽  
Trade Offs

Biparental care systems are a valuable model to examine conflict, cooperation, and coordination between unrelated individuals, as the product of the interactions between the parents influences the fitness of both individuals. A common experimental technique for testing coordinated responses to changes in the costs of parental care is to temporarily handicap one parent, inducing a higher cost of providing care. However, dissimilarity in experimental designs of these studies has hindered interspecific comparisons of the patterns of cost distribution between parents and offspring. Here we apply a comparative experimental approach by handicapping a parent at nests of five bird species using the same experimental treatment. In some species, a decrease in care by a handicapped parent was compensated by its partner, while in others the increased costs of care were shunted to the offspring. Parental responses to an increased cost of care primarily depended on the total duration of care that offspring require. However, life history pace (i.e., adult survival and fecundity) did not influence parental decisions when faced with a higher cost of caring. Our study highlights that a greater attention to intergenerational trade-offs is warranted, particularly in species with a large burden of parental care. Moreover, we demonstrate that parental care decisions may be weighed more against physiological workload constraints than against future prospects of reproduction, supporting evidence that avian species may devote comparable amounts of energy into survival, regardless of life history strategy.

Governing the Sacred

2020 ◽  
Author(s):  
Yuval Jobani ◽  
Nahshon Perez
Keyword(s):  
Social Order ◽  
Uttar Pradesh ◽  
The Novel ◽  
Sacred Sites ◽  
High Profile ◽  
National Monument ◽  
Trade Offs ◽  
Scholarly Contribution ◽  
Difficult Challenge ◽  
Temple Mount

Contested sacred sites pose a difficult challenge in the field of toleration. Holy sites are often at the center of intense contestation between different groups regarding a wide variety of issues, including ownership, access, usage rights, permissible religious conduct, and many other aspects. As such, they are often the source of immense levels of violence, and intractable, long-standing conflicts. Governing the Sacred profiles five central contested sacred sites which exemplify the immense difficulties associated with such sites: Devils Tower National Monument (Wyoming, U.S.), Babri Masjid/Ram Janmabhoomi (Uttar-Pradesh, India), the Western Wall (Jerusalem), the Church of the Holy Sepulchre (Jerusalem), and the Temple Mount/Haram esh-Sharif (Jerusalem). The in-depth, contextual and casuistic study of these sites, which differ in spatial, cultural, and religious settings, enables the construction of a novel, critical typology of five corresponding models or ways of governing the sacred. By telling the fascinating stories of five high-profile contested sacred sites, Governing the Sacred develops and critically explores five different models of governing contested sacred sites: “non-interference,” “separation and division,” “preference,” “status quo,” and “closure.” Each model, in turn, relies on different sets of considerations, central among them trade-offs between religious liberty and social order. Beyond its scholarly contribution, the novel typology developed in Governing the Sacred aims to assist democratic governments in their attempt to secure public order and mutual toleration among opposed groups in contested sacred sites.

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.

Are parental care trade-offs in shorebirds driven by parental investment or sexual selection?

2009 ◽  
Vol 22 (4) ◽  
pp. 672-682 ◽  
Author(s):  
V. A. OLSON ◽  
T. J. WEBB ◽  
R. P. FRECKLETON ◽  
T. SZÉKELY
Keyword(s):  
Sexual Selection ◽  
Parental Care ◽  
Parental Investment ◽  
Trade Offs

scholarly journals Trade-offs between energy maximization and parental care in a central place forager, the sea otter

2016 ◽  
Vol 27 (5) ◽  
pp. 1552-1566 ◽  
Author(s):  
N.M. Thometz ◽  
M.M. Staedler ◽  
J.A. Tomoleoni ◽  
J.L. Bodkin ◽  
G.B. Bentall ◽  
...  
Keyword(s):  
Parental Care ◽  
Central Place ◽  
Sea Otter ◽  
Trade Offs ◽  
Energy Maximization ◽  
Central Place Forager

Mate availability facilitates cannibalistic behaviour in a nest brooding fish: effects of timing during the brood cycle

Behaviour ◽  
2011 ◽  
Vol 148 (2) ◽  
pp. 247-264 ◽  
Author(s):  
Masanori Kohda ◽  
Nobuhiro Ohnishi ◽  
Noboru Okuda ◽  
Tomohiro Takeyama ◽  
Omar Myint
Keyword(s):  
Laboratory Experiments ◽  
Gravid Female ◽  
Theoretical Models ◽  
Filial Cannibalism ◽  
Mate Availability ◽  
Stimulus Female ◽  
Trade Offs ◽  
Future Reproduction ◽  
Cannibalistic Behaviour ◽  
The Subject

AbstractFilial cannibalism, eating one's own viable offspring, is accepted as an adaptive response to trade-offs between current and future reproduction. Theoretical models predict that high mate availability may induce more filial cannibalism, but this prediction is rarely tested. To examine this prediction, we performed laboratory experiments using the nest breeding goby Rhinogobius flumineus. Subject males were allowed to mate with a gravid female and care for the broods. A separate gravid female housed in a small cage (stimulus-female) was shown to the subject males at one of three different points during the brood cycle: prior to spawning, within 1 day after spawning and 1 week after spawning. Empty cages were shown as a control. Males that were shown the stimulus-female before spawning cannibalised more eggs than control males. In contrast, males that were shown the stimulus-females after spawning cannibalised as few eggs as control males did. Additionally, males that were shown the stimulus-female prior to spawning did not court females more intensively than other males. Thus, we suggest that the presence of an additional mate, rather than energy expenditure associated with courtship directed toward an additional mate, can facilitate males to cannibalise their eggs.

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