Transition from maternal provisioning: crunch time in vertebrate life histories?

Nislow, Keith H.; King, David I.

doi:10.1111/j.1469-7998.2006.00162.x

Cited by 6 publications

(5 citation statements)

References 9 publications

(13 reference statements)

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“…Energetic constraints on juvenile survival are thought to be important in the population dynamics and habitat requirements of a wide range of species (Nislow and King 2006). Energetic constraints on juvenile survival are thought to be important in the population dynamics and habitat requirements of a wide range of species (Nislow and King 2006).…”

Section: Discussionmentioning

confidence: 99%

“…By combining habitat-based energetic models with state-of-the art stable isotope techniques, we demonstrated that juvenile Atlantic salmon experience energetic limitation mediated through habitat availability during a critical period of their life cycle. Energetic constraints on juvenile survival are thought to be important in the population dynamics and habitat requirements of a wide range of species (Nislow and King 2006). However, the difficulty of accurately measuring the effects of key drivers (such as habitat) on key mechanisms (such as consumption) over brief but critical time periods has prevented direct tests.…”

Section: Discussionmentioning

confidence: 99%

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Habitat‐mediated Foraging Limitations Drive Survival Bottlenecks for Juvenile Salmon

Kennedy¹,

Nislow²,

Folt³

2008

Ecology

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Realistic population models and effective conservation strategies require a thorough understanding of mechanisms driving stage-specific mortality. Mortality bottlenecks for many species occur in the juvenile stage and are thought to result from limitation on food or foraging habitat during a "critical period" for growth and survival. Without a way to account for maternal effects or to measure integrated consumption rates in the field, it has been virtually impossible to test these relationships directly. Hence uncertainties about mechanisms underlying such bottlenecks remain. In this study we randomize maternal effects across sites and apply a new method for measuring consumption integrated over weeks to months to test the hypothesis that food limitation drives early-season juvenile mortality bottlenecks in Atlantic salmon (Salmo salar). Using natural signatures of geologically derived cesium (133Cs), we estimated consumption rates of >400 fry stocked into six streams. Two to four weeks after stocking, consumption was extremely low across sites (0.005 g x g(-1) x d(-1)) and was predicted to be below maintenance rations (i.e., yielding negative energy balances) for the majority of individuals from five of six sites. However, consumption during this time was positively correlated with growth rates and survival (measured at the end of the growing season). In contrast, consumption rates increased in mid- (0.030 g x g(-1) x d(-1)) and late (0.035 g x g(-1) x d(-1)) seasons, but juvenile survival and consumption were not correlated, and correlations between growth and consumption were weak. These findings are consistent with predictions of a habitat-based bioenergetic model constructed using the actual stream positions of the individual fish in the present study, which indicates that habitat-based models capture important environmental determinants of juvenile growth and survival. Hence, by combining approaches, reducing maternal effects and controlling initial conditions, we offer a general framework for linking foraging with juvenile survival and present the first direct consumption-based evidence for the early season bottleneck hypothesis.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Habitat‐mediated Foraging Limitations Drive Survival Bottlenecks for Juvenile Salmon

Kennedy¹,

Nislow²,

Folt³

2008

Ecology

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“…Adams et al 1994;Rauter et al 2000). However, the period following the withdrawal of parental provisioning can be a key limiting stage in offspring development (Hauser 1994;Nislow & King 2006); juvenile animals often lack the appropriate knowledge and motor skills to locate and acquire foods as competently as adults (Sullivan 1988;Weathers & Sullivan 1989;Egorova & Petrov 1998), and poorly developed foraging skills can cause significant juvenile mortality (Daunt et al 2007). One mechanism by which newly independent foragers may alleviate this potential problem is by focusing on more easily acquired food types while they hone the skills necessary to catch more difficult prey; such dietary shifts may also help reduce competition with adult conspecifics.…”

Section: Introductionmentioning

confidence: 99%

Environmental variation at the onset of independent foraging affects full-grown body mass in the red fox

2008

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The period following the withdrawal of parental care has been highlighted as a key developmental period for juveniles. One reason for this is that juveniles cannot forage as competently as adults, potentially placing them at greater risk from environmentally-induced changes in food availability. However, no study has examined this topic. Using a long-term dataset on red foxes (Vulpes vulpes), we examined (i) dietary changes that occurred in the one-month period following the attainment of nutritional independence, (ii) diet composition in relation to climatic variation, and (iii) the effect of climatic variation on subsequent full-grown mass. Diet at nutritional independence contained increased quantities of easy-to-catch food items (earthworms and insects) when compared with pre-independence. Interannual variation in the volume of rainfall at nutritional independence was positively correlated to the proportion of earthworms in cub diet. Pre-independence cub mass and rainfall immediately following nutritional independence explained a significant proportion of variance in full-grown mass, with environmental variation affecting full-grown mass of the entire cohorts. Thus, weather-mediated availability of easyto-catch food items at a key developmental stage has lifelong implications for the development of juvenile foxes by affecting full-grown mass, which in turn appears to be an important component of individual reproductive potential.

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“…Such effects might shape offspring survival and reproductive success by changing the expression of discrete foraging modules to improve offspring foraging success in the environment. Indeed, foraging patterns are under strong selective pressures that shape life histories and must be well adapted to environmental conditions (Lee, 1996; Nislow and King, 2006; Stephens et al, 2007). The functions of parental effects on offspring social behaviors have been considered by others (Haig, 2000b; Isles et al, 2006; Ubeda and Gardner, 2010).…”

Section: Discussionmentioning

confidence: 99%

Dopa decarboxylase is a genetic hub of parental control over offspring behavior

Bonthuis

Steinwand

Huang

et al. 2020

Preprint

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SUMMARYDopa decarboxylase (DDC) regulates the synthesis of monoaminergic neurotransmitters and is linked to psychiatric and metabolic disorders. Ddc exhibits complex genomic imprinting effects that have not been functionally studied. Here, we investigate different noncanonical imprinting effects at the cellular level with a focus on Ddc. Using allele-specific reporter mice, we found Ddc exhibits dominant expression of the maternal allele in subpopulations of cells in 14 of 52 brain regions, and dominant paternal or maternal allele expression in adrenal cell subpopulations. Maternal versus paternal Ddc allele null mutations differentially affect offspring social, foraging and exploratory behaviors. Machine learning analyses of naturalistic foraging in Ddc−/+ and +/− offspring uncovered finite behavioral sequences controlled by the maternal versus paternal Ddc alleles. Additionally, parental Ddc genotype is revealed to affect behavior independent of offspring genotype. Thus, Ddc is a hub of maternal and paternal influence on behavior that mediates diverse imprinting and parental effects.HIGHLIGHTSDopa decarboxylase (Ddc) allelic expression resolved at the cellular levelCells differentially express maternal versus paternal Ddc allelesMaternal and paternal Ddc alleles control distinct behavioral sequencesParental Ddc genotype affects offspring independent of mutation transmissioneTOCAllelic reporter mice and machine learning analyses reveal dopa decarboxylase is affected by diverse imprinting and parental effects that shape finite behavioral sequences in sons and daughters.

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Transition from maternal provisioning: crunch time in vertebrate life histories?

Cited by 6 publications

References 9 publications

Habitat‐mediated Foraging Limitations Drive Survival Bottlenecks for Juvenile Salmon

Habitat‐mediated Foraging Limitations Drive Survival Bottlenecks for Juvenile Salmon

Environmental variation at the onset of independent foraging affects full-grown body mass in the red fox

Dopa decarboxylase is a genetic hub of parental control over offspring behavior

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