Offspring dynamics affect food provisioning, growth and mortality in a brood-caring spider

Ruch, Jasmin; Herberstein, Marie E.; Schneider, Jutta M.

doi:10.1098/rspb.2013.2180

Cited by 17 publications

(12 citation statements)

References 33 publications

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“…A gain in mass prior to active care may be regarded as anticipation of later energetic demands, and the subsequent loss in mass as a measure of parental effort for the current brood (Drent & Daan ; Ruch et al. ). Loss of mass during active care has been interpreted either as a reflection of the energetic demand imposed by brood care (energetic stress hypothesis) or a shift to a body weight adaptive for flight and foraging for nestlings (Freed ; Moreno & Hillström ; Merkle & Barclay ).…”

Section: Introductionmentioning

confidence: 99%

Influences of Parental Care and Food Deprivation on Regulation of Body Mass in a Burying Beetle

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Xhihani

2015

Ethology

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Changes in adult body mass during breeding can reveal how parents prepare energetically for care, the stress of care, and the need to terminate care in a state conducive for future reproduction. Interpreting changes in parent mass can be difficult, however, because temporal variation in body mass may reflect a constraint imposed by the stress of care, revealing conflict within the family, or a shift to a new body mass optimum adaptive for a different stage of the breeding cycle. Here, we examined the effect of food deprivation and parenting on variation in female body mass of Nicrophorus orbicollis, an insect in which parents and offspring share a common food resource (a prepared carrion ball). Female parents demonstrated a remarkable degree of regulation of body mass: Despite varied periods of food deprivation (0-8 d) prior to discovery of a carcass, females attained a similar body mass (108.3-109.2% of pre-deprivation mass) at the time of larval hatching. Females attained a greater body mass in anticipation of rearing a greater number of young. Mothers lost mass during active parental care, and mass at the end of caregiving was less in mothers that reared more and heavier young. Body mass at the end of care was less than the preferred mass for females searching for a carcass, indicating that the mothers sacrificed self-maintenance and future reproductive potential for their current brood. Contrary to prediction, pre-breeding food deprivation had no effect on offspring size or on female condition at the end of care. We conclude that there is a limited degree of conflict over the sharing of food among N. orbicollis parents and offspring, but that this conflict is not exacerbated by food deprivation prior to breeding.Ethology 121 (2015) 985-993

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Section: Introductionmentioning

confidence: 99%

Influences of Parental Care and Food Deprivation on Regulation of Body Mass in a Burying Beetle

Trumbo

Xhihani

2015

Ethology

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“…Females of at least three Anelosimus species (Theridiidae) cannot discriminate between their progeny and foreign egg sacs, which may be a step in the evolution of alloparental care and sociality in this group (Samuk & Avilés, 2013). More recently, however, there has been an accumulation of evidence for parental discrimination in spiders, but it was investigated only from the female perspective (Anthony, 2003; Clark & Jackson, 1994; Japyassú et al., 2003; Ruch et al., 2014; Yip & Rayor, 2014). There is no evidence, by now, that males of M. porracea can evaluate offspring relatedness (Moura et al., 2017, 2019), and our study is an additional evidence against male parental recognition hypothesis.…”

Section: Discussionmentioning

confidence: 99%

“Where ignorance is bliss, 'tis folly to be wise”: Indiscriminate male care in a neotropical spider

et al. 2020

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Certainty of paternity is considered an important condition for the evolution and maintenance of extended male care. In some species, males may cannibalize unrelated offspring or abandon the progeny when the uncertainty of paternity is high, or when they take over nest sites or females from other males. However, male protection of offspring can also evolve in situations of uncertainty of paternity, especially when males cannot recognize offspring relatedness. In such cases, males may take care of all their mate's offspring, regardless of paternity. In Manogea porracea (Araneidae), the only known spider species where males care for offspring, males repel competitors by assuming and defending specific positions within a female's web, but females accept multiple partners during the reproductive season. Consequently, males may care for some offspring produced with the sperm of their mate's previous partners. If males cannot detect offspring relatedness, we expect that they will not cannibalize progeny and will actively protect all offspring against predation. The main goal of this study was to investigate whether the extended male care depends on offspring relatedness recognition. Therefore, we experimentally manipulated offspring relatedness and the presence of foster males and two egg predators usually found invading M. porracea webs. We also compared our results with data from an experiment performed by Moura, Vasconcellos‐Neto, & Gonzaga (2017) using the same laboratory procedures, but introducing egg sacs fathered exclusively by the males. Males did not cannibalize offspring and protected the progeny against predation regardless of offspring relatedness. In addition, all males moved the egg sacs to the center of the web, remaining close to the progeny. We conclude that M. porracea males protect all progeny present in their partner's web and increase offspring survivorship regardless of relatedness. We discuss the behavioral and evolutionary implications of our findings, and potential triggers of male care in M. porracea.

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“…Inbreeding increases relatedness among offspring, potentially affecting sibling conflict within or among broods (Parker et al, 2002;Bonisoli-Alquati et al, 2011;Ruch et al, 2014). Within broods, conflict over PI is directly proportional to relatedness among offspring following Hamilton's rule (Hamilton, 1964a,b), assuming that a focal female's total PI budget is fixed per brood.…”

Section: Intrafamilial Conflict Given Inbreedingmentioning

confidence: 99%

Inbreeding parents should invest more resources in fewer offspring

Duthie

Lee

Reid

2016

Preprint

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Inbreeding increases parent-offspring relatedness and commonly reduces offspring viability, shaping selection on reproductive interactions involving relatives and associated parental investment (PI). Nevertheless, theories predicting selection for inbreeding versus inbreeding avoidance and selection for optimal PI have only been considered separately, precluding prediction of optimal PI and associated reproductive strategy given inbreeding. We unify inbreeding and PI theory, demonstrating that optimal PI increases when a female's inbreeding decreases the viability of her offspring. Inbreeding females should therefore produce fewer offspring due to the fundamental trade-off between offspring number and PI. Accordingly, selection for inbreeding versus inbreeding avoidance changes when females can adjust PI with the degree that they inbreed. By contrast, optimal PI does not depend on whether a focal female is herself inbred. However, inbreeding causes optimal PI to increase given strict monogamy and associated biparental investment compared with female-only investment. Our model implies that understanding evolutionary dynamics of inbreeding strategy, inbreeding depression, and PI requires joint consideration of the expression of each in relation to the other. Overall, we demonstrate that existing PI and inbreeding theories represent special cases of a more general theory, implying that intrinsic links between inbreeding and PI affect evolution of behaviour and intrafamilial conflict.

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Offspring dynamics affect food provisioning, growth and mortality in a brood-caring spider

Cited by 17 publications

References 33 publications

Influences of Parental Care and Food Deprivation on Regulation of Body Mass in a Burying Beetle

Influences of Parental Care and Food Deprivation on Regulation of Body Mass in a Burying Beetle

“Where ignorance is bliss, 'tis folly to be wise”: Indiscriminate male care in a neotropical spider

Inbreeding parents should invest more resources in fewer offspring

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