Mechanisms for adaptive cohort splitting

Crowley, Philip H.; Hopper, Kevin R.

doi:10.1016/j.ecolmodel.2015.03.018

Cited by 15 publications

(17 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…, McNamara , Descamps et al. , Wilkin and Sheldon , Crowley and Hopper ). The resulting individual differences later in life are referred to as dynamic heterogeneity when they are generated from a stochastic process affecting changes in life‐history stages (Tuljapurkar et al.…”

Section: Introductionmentioning

confidence: 99%

Cohort variation in individual body mass dissipates with age in large herbivores

Hamel

Gaillard

Yoccoz

et al. 2016

Ecological Monographs

View full text Add to dashboard Cite

Abstract. Environmental conditions experienced during early growth and development markedly shape phenotypic traits. Consequently, individuals of the same cohort may show similar life-history tactics throughout life. Conditions experienced later in life, however, could fine-tune these initial differences, either increasing (cumulative effect) or decreasing (compensatory effect) the magnitude of cohort variation with increasing age. Our novel comparative analysis that quantifies cohort variation in individual body size trajectories shows that initial cohort variation dissipates throughout life, and that lifetime patterns change both across species with different paces of life and between sexes. We used longitudinal data on body size (mostly assessed using mass) from 11 populations of large herbivores spread along the "slow-fast" continuum of life histories. We first quantified cohort variation using mixture models to identify clusters of cohorts with similar initial size. We identified clear cohort clusters in all species except the one with the slowest pace of life, revealing that variation in early size is structured among cohorts and highlighting typological differences among cohorts. Growth trajectories differed among cohort clusters, highlighting how early size is a fundamental determinant of lifetime growth patterns. In all species, among-cohort variation in size peaked at the start of life, then quickly decreased with age and stabilized around mid-life. Cohort variation was lower in species with a slower than a faster pace of life, and vanished at prime age in species with the slowest pace of life. After accounting for viability selection, compensatory/ catch-up growth in early life explained much of the decrease in cohort variation. Females showed less phenotypic variability and stronger compensatory/catch-up growth than males early in life, whereas males showed more progressive changes throughout life. These results confirm that stronger selective pressures for rapid growth make males more vulnerable to poor environmental conditions early in life and less able to recover after a poor start. Our comparative analysis illustrates how variability in growth changes over time in closely related species that span a wide range on the slow-fast continuum, the main axis of variation in life-history strategies of vertebrates.

show abstract

Section: Introductionmentioning

confidence: 99%

Cohort variation in individual body mass dissipates with age in large herbivores

Hamel

Gaillard

Yoccoz

et al. 2016

Ecological Monographs

View full text Add to dashboard Cite

show abstract

“…The S1 cohort emerged over a 1‐month period; therefore, the hatching time was rather variable. Cohort splitting could be induced by ‘initiation asynchrony,’ which is attributed to differences in hatching time within a cohort (Crowley & Hopper ). During initiation asynchrony, early‐hatching individuals develop more quickly than later hatching individuals (Crowley & Hopper ).…”

Section: Discussionmentioning

confidence: 99%

“…Cohort splitting could be induced by ‘initiation asynchrony,’ which is attributed to differences in hatching time within a cohort (Crowley & Hopper ). During initiation asynchrony, early‐hatching individuals develop more quickly than later hatching individuals (Crowley & Hopper ). Although it is unclear whether initiation asynchrony was involved, cohort splitting has been reported by previous life history studies of E. orientalis (Watanabe ).…”

Section: Discussionmentioning

confidence: 99%

“…b). It is possible that the F cohort may not always be present since initiation asynchrony is sensitive to environmental conditions, especially temperature (Crowley & Hopper ; Rádai et al . ).…”

Section: Discussionmentioning

confidence: 99%

“…Cohort splitting, which refers to the separation of single cohorts into multiple cohorts that differ in terms of development rate (Crowley & Hopper ), has been reported in several invertebrate taxa (Kiss & Samu ; Schultheis et al . ; Watts & Thompson ).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of flood disturbance on the cohort structure of the riverine mayfly Ephemera orientalis (Ephemeroptera: Ephemeridae) in the Han River in Seoul, Korea

Seok

Baek

Hwang

et al. 2019

Entomological Research

View full text Add to dashboard Cite

The aim of the present study was to investigate the adaptation of coexisting Ephemera orientalis (Ephemeroptera: Ephemeridae) cohorts to flood timing. Larvae were collected from the Han River (Seoul, Korea) from 2012 to 2014, and their life history was assessed by measuring head capsule width and by comparing the emergence period of the insects in relation with the flood season. Two slow‐growing cohorts (S1 and S2) and one fast‐growing cohort (F) were identified. The S1 cohort was found to hatch in June or July and to emerge the following summer. Whereas, the S2 cohort was found to hatch in August or September and emerge the following August. Early‐hatching larvae from the S1 cohort became the F cohort through the process of cohort splitting and subsequently merged with the S2 cohort. The F cohort, however, was not observed when huge floods occurred or under low temperature conditions. Furthermore, floods that resulted from >80 mm precipitation significantly reduced larval abundance; therefore, flooding affects cohorts both directly and indirectly. Most cohorts emerged before and after the flood season (July 10 to August 10). The results of the present study indicate that the emergence period of E. orientalis has evolved to avoid the flood season.

show abstract

Voltinism of a solitary bee was influenced by temperature but not provision size

Dorian

2024

Oecologia

View full text Add to dashboard Cite

Mechanisms for adaptive cohort splitting

Cited by 15 publications

References 67 publications

Cohort variation in individual body mass dissipates with age in large herbivores

Cohort variation in individual body mass dissipates with age in large herbivores

Effects of flood disturbance on the cohort structure of the riverine mayfly Ephemera orientalis (Ephemeroptera: Ephemeridae) in the Han River in Seoul, Korea

Voltinism of a solitary bee was influenced by temperature but not provision size

Contact Info

Product

Resources

About