scholarly journals Access to Resources Shapes Sex Differences Between Caring Parents

2021 ◽  
Vol 9 ◽  
Author(s):  
Tom Ratz ◽  
Katerina Kremi ◽  
Lyndon Leissle ◽  
Jon Richardson ◽  
Per T. Smiseth
Keyword(s):  
Sex Differences ◽  
Parental Care ◽  
Mass Range ◽  
Environmental Variable ◽  
Burying Beetle ◽  
Access To Resources ◽  
Offspring Performance ◽  
More Care ◽  
Nicrophorus Vespilloides ◽  
The Impact

In species where both parents cooperate to care for their joint offspring, one sex often provides more care than the other. The magnitude of such sex differences often varies both between and within species and may depend on environmental conditions, such as access to resources, predation risk and interspecific competition. Here we investigated the impact of one such environmental variable – access to resources for breeding – on the magnitude of sex differences in parental care in the burying beetle Nicrophorus vespilloides. This species breeds on the carcasses of small vertebrates, which are the sole food source for parents and offspring during breeding. We manipulated access to resources by providing pairs with mouse carcasses from a broad mass range (3.65–26.15 g). We then monitored subsequent effects on the duration and amount of care provided by males and females, male and female food consumption and weight change during breeding, and larval traits related to offspring performance. We found that males increased their duration of care as carcass mass increased, while females remained with the brood until it had completed its development irrespective of carcass mass. There were thus more pronounced sex differences in parental care when parents had access to fewer resources for breeding. Overall, our findings show that sex differences between caring parents vary depending on access to resources during breeding. The finding that males extended their duration of care on larger carcasses suggests that access to more resources leads to a shift toward more cooperation between caring parents.

scholarly journals Parental care buffers against effects of ambient temperature on offspring performance in an insect

2019 ◽  
Vol 30 (5) ◽  
pp. 1443-1450 ◽  
Author(s):  
Richard Grew ◽  
Tom Ratz ◽  
Jon Richardson ◽  
Per T Smiseth
Keyword(s):  
Ambient Temperature ◽  
Parental Care ◽  
Female Parent ◽  
Larval Survival ◽  
Climatic Conditions ◽  
Burying Beetle ◽  
Offspring Performance ◽  
Behavioral Mechanism ◽  
Wide Range ◽  
Nicrophorus Vespilloides

AbstractUnderstanding how animals respond to and cope with variation in ambient temperature is an important priority. The reason for this is that ambient temperature is a key component of the physical environment that influences offspring performance in a wide range of ectotherms and endotherms. Here, we investigate whether posthatching parental care provides a behavioral mechanism for buffering against the effects of ambient temperature on offspring in the burying beetle Nicrophorus vespilloides. We used a 3 × 2 factorial design where we manipulated ambient temperature (15, 20, or 25 °C) and parental care (presence or absence of a female parent after hatching). We found that the effect of ambient temperature on offspring performance was conditional upon the presence or absence of a caring female. Fewer larvae survived in the absence than in the presence of a caring female at 15 °C while there was no difference in larval survival at 20 and 25 °C. Our results show that parental care buffers against some of the detrimental effects of variation in ambient temperature on offspring. We suggest that posthatching parental care may buffer against such effects by creating a more benign environment or by boosting offspring resilience toward stressors. Our results have important implications for our understanding of the evolution of parental care because they suggest that the evolution of parental care could allow species to expand their geographical range to colonize areas with harsher climatic conditions than they otherwise would tolerate.

scholarly journals Evolutionary change in the construction of the nursery environment when parents are prevented from caring for their young directly

2021 ◽  
Vol 118 (48) ◽  
pp. e2102450118
Author(s):  
Ana Duarte ◽  
Darren Rebar ◽  
Allysa C. Hallett ◽  
Benjamin J. M. Jarrett ◽  
Rebecca M. Kilner
Keyword(s):  
Parental Care ◽  
Experimental Evolution ◽  
Evolutionary Change ◽  
Direct Care ◽  
Dead Body ◽  
Extended Phenotype ◽  
Burying Beetle ◽  
Burying Beetles ◽  
Nicrophorus Vespilloides ◽  
Cross Fostering

Parental care can be partitioned into traits that involve direct engagement with offspring and traits that are expressed as an extended phenotype and influence the developmental environment, such as constructing a nursery. Here, we use experimental evolution to test whether parents can evolve modifications in nursery construction when they are experimentally prevented from supplying care directly to offspring. We exposed replicate experimental populations of burying beetles (Nicrophorus vespilloides) to different regimes of posthatching care by allowing larvae to develop in the presence (Full Care) or absence of parents (No Care). After only 13 generations of experimental evolution, we found an adaptive evolutionary increase in the pace at which parents in the No Care populations converted a dead body into a carrion nest for larvae. Cross-fostering experiments further revealed that No Care larvae performed better on a carrion nest prepared by No Care parents than did Full Care larvae. We conclude that parents construct the nursery environment in relation to their effectiveness at supplying care directly, after offspring are born. When direct care is prevented entirely, they evolve to make compensatory adjustments to the nursery in which their young will develop. The rapid evolutionary change observed in our experiments suggests there is considerable standing genetic variation for parental care traits in natural burying beetle populations—for reasons that remain unclear.

scholarly journals Male age mediates reproductive investment and response to paternity assurance

2013 ◽  
Vol 280 (1764) ◽  
pp. 20131124 ◽  
Author(s):  
Kyle M. Benowitz ◽  
Megan L. Head ◽  
Camellia A. Williams ◽  
Allen J. Moore ◽  
Nick J. Royle
Keyword(s):  
Prenatal Care ◽  
Reproductive Investment ◽  
Burying Beetle ◽  
Offspring Performance ◽  
Male Response ◽  
Male Age ◽  
Paternity Assurance ◽  
Trade Offs ◽  
Nicrophorus Vespilloides ◽  
Older Males

Theory predicts that male response to reduced paternity will depend on male state and interactions between the sexes. If there is little chance of reproducing again, then males should invest heavily in current offspring, regardless of their share in paternity. We tested this by manipulating male age and paternity assurance in the burying beetle Nicrophorus vespilloides . We found older males invested more in both mating effort and parental effort than younger males. Furthermore, male age, a component of male state, mediated male response to perceived paternity. Older males provided more prenatal care, whereas younger males provided less prenatal care, when perceived paternity was low. Adjustments in male care, however, did not influence selection acting indirectly on parents, through offspring performance. This is because females adjusted their care in response to the age of their partner, providing less care when paired with older males than younger males. As a result offspring, performance did not differ between treatments. Our study shows, for the first time, that a male state variable is an important modifier of paternity–parental care trade-offs and highlights the importance of social interactions between males and females during care in determining male response to perceived paternity.

scholarly journals The Importance Of Pre-Hatching Paternal Care On Offspring Fitness In Burying Beetle, Nicrophorus Vespilloides Herbst.

1970 ◽  
Vol 21 (1) ◽  
pp. 47-54
Author(s):  
Sharmin Musa
Keyword(s):  
Treatment Group ◽  
Parental Care ◽  
Paternal Care ◽  
Male Parent ◽  
Direct Care ◽  
Removal Experiment ◽  
Burying Beetle ◽  
Offspring Fitness ◽  
Nicrophorus Vespilloides ◽  
Positive Effect

A male-removal experiment was performed to determine if the value of male parental care depended on the timing of the help. In the experiment male parent was removed before the carcass was prepared for breeding, after partial carcass preparation, after complete carcass preparation, before direct care for the larvae and males were allowed to disperse naturally after caring for the larvae. It was found that where the male provided complete pre-hatching care or both preand post-hatching care offspring were larger and in better condition. Mass of offspring at eclosion was affected by male removal (F3,1266 = 5.087, p = 0.002) though size of offspring was not affected by the treatment group. Complete prehatching care had a positive effect on development compared to limited care (F3, 1267 = 8.501, p < 0.000) but this effect disappeared if males remained after the larvae hatched. Larval survivorship did not vary among treatments (F3,122 = 0.531, p = 0.662).  

scholarly journals Development and application of 14 microsatellite markers in the burying beetle Nicrophorus vespilloides reveals population genetic differentiation at local spatial scales

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3278 ◽  
Author(s):  
Sonia Pascoal ◽  
Rebecca M. Kilner
Keyword(s):  
Genetic Differentiation ◽  
Microsatellite Markers ◽  
Parental Care ◽  
Social Evolution ◽  
Spatial Scales ◽  
Burying Beetle ◽  
Genetic Structuring ◽  
Population Genetic Differentiation ◽  
Nicrophorus Vespilloides ◽  
Limited Dispersal

Burying beetles (genus Nicrophorus) are relatively rare among insects in providing sophisticated parental care. Consequently, they have become model species in research analysing social evolution, the evolution of parental care and mating systems. We used the recently published N. vespilloides genome and transcriptome to develop microsatellite markers. Specifically, we developed 14 polymorphic markers with five to 13 alleles per locus and used them to investigate levels of genetic differentiation in four south Cambridgeshire (UK) populations of N. vespilloides, separated by 21 km at most. The markers revealed significant genetic structuring among populations (global FST = 0.023) with all but one of the pairwise comparisons among populations being significant. The single exception was the comparison between the two closest populations, which are approximately 2.5 km apart. In general, the microsatellite markers showed lower observed heterozygosity than expected. We infer that there is limited dispersal between populations and potentially also some inbreeding within them and suggest that this may be due to habitat fragmentation. We discuss these results in the context of recent laboratory experiments on inbreeding and beetle flight.

scholarly journals Food deprivation affects egg laying and maternal care but not offspring performance in a beetle

2019 ◽  
Vol 30 (5) ◽  
pp. 1477-1487 ◽  
Author(s):  
Jon Richardson ◽  
Jennifer Ross ◽  
Per T Smiseth
Keyword(s):  
Food Deprivation ◽  
Egg Laying ◽  
Breeding Cycle ◽  
Burying Beetle ◽  
Negative Effects ◽  
Initial State ◽  
Offspring Performance ◽  
Poor Understanding ◽  
Nicrophorus Vespilloides ◽  
And Control

Abstract Individuals vary with respect to their nutritional state and such variation is an important determinant of the amount of resources individuals allocate toward reproductive functions. Currently, we have a relatively poor understanding of the downstream consequences of food deprivation on different traits associated with reproduction. Here, we address this gap by investigating how food deprivation affected different traits across the breeding cycle in the burying beetle, Nicrophorus vespilloides; a species that breeds on carcasses of small vertebrates serving as food for both parents and offspring. We found that food-deprived females took longer to start egg laying than control females, which may allow them more time to feed from the carcass. There was no difference between food-deprived and control females in the number, size, laying pattern, or hatching success of eggs, suggesting that this delay allowed females to compensate for their poor initial state. However, food-deprived females spent less time providing care, suggesting that this compensation was incomplete. Finally, we found no evidence for negative effects of food deprivation on the offspring’s growth or survival, which is surprising given that food-deprived females took longer to initiate egg laying and provided less care to their offspring. Our results highlight that food deprivation can have complex effects on parental and offspring traits, and suggest that females face a trade-off between the benefits of mitigating downstream consequences of nutritional stress and the costs associated with delaying the start of reproduction.

scholarly journals Adaptive evolution of synchronous egg-hatching in compensation for the loss of parental care

2018 ◽  
Vol 285 (1885) ◽  
pp. 20181452 ◽  
Author(s):  
Benjamin J. M. Jarrett ◽  
Darren Rebar ◽  
Hannah B. Haynes ◽  
Miranda R. Leaf ◽  
Chay Halliwell ◽  
...  
Keyword(s):  
Parental Care ◽  
The Body ◽  
Burying Beetle ◽  
Burying Beetles ◽  
Egg Hatching ◽  
Asynchronous Hatching ◽  
Nicrophorus Vespilloides ◽  
Experimental Populations ◽  
And Control ◽  
Better Than

Interactions among siblings are finely balanced between rivalry and cooperation, but the factors that tip the balance towards cooperation are incompletely understood. Previous observations of insect species suggest that (i) sibling cooperation is more likely when siblings hatch at the same time, and (ii) this is more common when parents provide little to no care. In this paper, we tested these ideas experimentally with the burying beetle, Nicrophorus vespilloides . Burying beetles convert the body of a small dead vertebrate into an edible nest for their larvae, and provision and guard their young after hatching. In our first experiment, we simulated synchronous or asynchronous hatching by adding larvae at different intervals to the carrion-breeding resource. We found that ‘synchronously’ hatched broods survived better than ‘asynchronously’ hatched broods, probably because ‘synchronous hatching’ generated larger teams of larvae, that together worked more effectively to penetrate the carrion nest and feed upon it. In our second experiment, we measured the synchronicity of hatching in experimental populations that had evolved for 22 generations without any post-hatching care, and control populations that had evolved in parallel with post-hatching care. We found that larvae were more likely to hatch earlier, and at the same time as their broodmates, in the experimental populations that evolved without post-hatching care. We suggest that synchronous hatching enables offspring to help each other when parents are not present to provide care. However, we also suggest that greater levels of cooperation among siblings cannot compensate fully for the loss of parental care.

scholarly journals Carry on caring: infected females maintain their parental care despite high mortality

2021 ◽  
Author(s):  
Tom Ratz ◽  
Katy M Monteith ◽  
Pedro F Vale ◽  
Per T Smiseth
Keyword(s):  
Parental Care ◽  
Disease Transmission ◽  
Reproductive Output ◽  
Sickness Behavior ◽  
Immune Gene ◽  
Burying Beetle ◽  
Immune Genes ◽  
Levels Of Care ◽  
Nicrophorus Vespilloides ◽  
High Level

Abstract Parental care is a key component of an organism’s reproductive strategy that is thought to trade-off with allocation toward immunity. Yet, it is unclear how caring parents respond to pathogens: do infected parents reduce care as a sickness behavior or simply from being ill or do they prioritize their offspring by maintaining high levels of care? To address this issue, we investigated the consequences of infection by the pathogen Serratia marcescens on mortality, time spent providing care, reproductive output, and expression of immune genes of female parents in the burying beetle Nicrophorus vespilloides. We compared untreated control females with infected females that were inoculated with live bacteria, immune-challenged females that were inoculated with heat-killed bacteria, and injured females that were injected with buffer. We found that infected and immune-challenged females changed their immune gene expression and that infected females suffered increased mortality. Nevertheless, infected and immune-challenged females maintained their normal level of care and reproductive output. There was thus no evidence that infection led to either a decrease or an increase in parental care or reproductive output. Our results show that parental care, which is generally highly flexible, can remain remarkably robust and consistent despite the elevated mortality caused by infection by pathogens. Overall, these findings suggest that infected females maintain a high level of parental care, a strategy that may ensure that offspring receive the necessary amount of care but that might be detrimental to the parents’ own survival or that may even facilitate disease transmission to offspring.

scholarly journals A gene for social immunity in the burying beetle Nicrophorus vespilloides?

2015 ◽  
Author(s):  
William JP Palmer ◽  
Ana Duarte ◽  
Matthew Schrader ◽  
Jonathan P Day ◽  
Rebecca Kilner ◽  
...  
Keyword(s):  
Immune System ◽  
Parental Care ◽  
Microbial Growth ◽  
Group Living ◽  
Social Immunity ◽  
Burying Beetle ◽  
Burying Beetles ◽  
Nicrophorus Vespilloides ◽  
Living Species ◽  
Six Genes

Some group-living species exhibit social immunity, where the immune system of one individual can protect others in the group from infection. In burying beetles this is part of parental care. Larvae feed on vertebrate carcasses which their parents smear with exudates that inhibit microbial growth. We have sequenced the transcriptome of the burying beetle Nicrophorus vespilloides and identified six genes that encode lysozymes – a type of antimicrobial enzyme that has previously been implicated in social immunity in burying beetles. When females start breeding and producing antimicrobial anal exudates, we found that the expression of one of these genes was increased by ~1000 times to become one of the most abundant transcripts in the transcriptome. We conclude that we have likely identified a gene for social immunity, and that it was recruited during evolution from a previous function in personal immunity.

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