Between semelparity and iteroparity: Empirical evidence for a continuum of modes of parity

Hughes, P. William

doi:10.1002/ece3.3341

Cited by 90 publications

(40 citation statements)

References 355 publications

(400 reference statements)

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“…reproduction). Together, vital rates combinations determine not only an individual's fitness (Lande, 1982;Roff, 2002) but also its key life-history traits, such as the rate of senescence (Jones et al, 2014), generation time (Gaillard et al, 2005) or degree of iteroparity (Hughes, 2017). The combination of an organism's life-history traits results in its life history strategy, such as being a long-lived masting species (Bogdziewicz, Steele, Marino, & Crone, 2018), or a monocarpic perennial species (Hughes, 2017).…”

Section: Introductionmentioning

confidence: 99%

Delivering the promises of trait‐based approaches to the needs of demographic approaches, and vice versa

et al. 2018

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Few facets of biology vary more than functional traits and life‐history traits. To explore this vast variation, functional ecologists and population ecologists have developed independent approaches that identify the mechanisms behind and consequences of trait variation.Collaborative research between researchers using trait‐based and demographic approaches remains scarce. We argue that this is a missed opportunity, as the strengths of both approaches could help boost the research agendas of functional ecology and population ecology.This special feature, which spans three journals of the British Ecological Society due to its interdisciplinary nature, showcases state‐of‐the‐art research applying trait‐based and demographic approaches to examine relationships between organismal function, life history strategies and population performance across multiple kingdoms. Examples include the exploration of how functional trait × environment interactions affect vital rates and thus explain population trends and species occurrence; the coordination of seed traits and dispersal ability with the pace of life in plants; the incorporation of functional traits in dynamic energy budget models; or the discovery of linkages between microbial functional traits and the fast–slow continuum.Despite their historical isolation, collaborative work between functional ecologists and population ecologists could unlock novel research pathways. We call for an integrative research agenda to evaluate which and when traits are functional, as well as their ability to describe and predict life history strategies and population dynamics. We highlight promising, complementary research avenues to overcome current limitations. These include a more explicit linkage of selection gradients in the context of functional trait–vital rate relationships, and the implementation of standardised protocols to track changes in traits and vital rates over time at the same location and individuals, thus allowing for the explicit incorporation of trade‐offs in analyses of covariation of functional traits and life‐history traits.

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Section: Introductionmentioning

confidence: 99%

Delivering the promises of trait‐based approaches to the needs of demographic approaches, and vice versa

et al. 2018

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“…Identifying the conditions in which an annual life history can obtain a demographic advantage over a perennial one has been a major project in life history theory (Hughes, ; Hughes & Simons, ). However, few models explicitly consider the role played by genetic elements in the regulation of life history traits, or the degree to which trade‐offs can be constrained by pleiotropy.…”

Section: Discussionmentioning

confidence: 99%

“…Identifying the conditions in which an annual life history can obtain a demographic advantage over a perennial one has been a major project in life history theory (Hughes, 2017;Hughes & Simons, 2014).…”

Section: Con Clus I On and Outlookmentioning

confidence: 99%

Seed traits are pleiotropically regulated by the flowering time gene PERPETUAL FLOWERING 1 (PEP1) in the perennial Arabis alpina

2019

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The life cycles of plants are characterized by two major life history transitions—germination and the initiation of flowering—the timing of which are important determinants of fitness. Unlike annuals, which make the transition from the vegetative to reproductive phase only once, perennials iterate reproduction in successive years. The floral repressor PERPETUAL FLOWERING 1 (PEP1), an ortholog of FLOWERING LOCUS C, in the alpine perennial Arabis alpina ensures the continuation of vegetative growth after flowering and thereby restricts the duration of the flowering episode. We performed greenhouse and garden experiments to compare flowering phenology, fecundity and seed traits between A. alpina accessions that have a functional PEP1 allele and flower seasonally and pep1 mutants and accessions that carry lesions in PEP1 and flower perpetually. In the garden, perpetual genotypes flower asynchronously and show higher winter mortality than seasonal ones. PEP1 also pleiotropically regulates seed dormancy and longevity in a way that is functionally divergent from FLC. Seeds from perpetual genotypes have shallow dormancy and reduced longevity regardless of whether they after‐ripened in plants grown in the greenhouse or in the experimental garden. These results suggest that perpetual genotypes have higher mortality during winter but compensate by showing higher seedling establishment. Differences in seed traits between seasonal and perpetual genotypes are also coupled with differences in hormone sensitivity and expression of genes involved in hormonal pathways. Our study highlights the existence of pleiotropic regulation of seed traits by hub developmental regulators such as PEP1, suggesting that seed and flowering traits in perennial plants might be optimized in a coordinated fashion.

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“…As finite resources expended on current reproduction will reduce potential survival and, as such, additional chances to reproduce (Williams 1966), a trade-off must be made between the total resources invested per clutch and the number of clutches produced over reproductive life (i.e. semelparity versus iteroparity) (Hughes 2017). Further, a trade-off must also be made between the number of eggs produced per clutch and their size, given a female's finite eggcarrying capacity and reproductive reserve (Lack 1967).…”

Section: Introductionmentioning

confidence: 99%

Quality versus quantity: The balance between egg and clutch size among Australian amphibians is related to life history and environmental conditions

Gould¹,

Beranek²,

Valdez

et al. 2020

Preprint

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An inverse relationship between egg and clutch size has been found repeatedly across animal groups, including birds, reptiles and amphibians, and is considered to be a result of resource limitations and physical constraints on the reproducing female. However, few studies have contextualised this relationship with respect to various environmental selecting pressures and life history traits that have also likely influenced the selection of an optimal egg/clutch size combination, while even fewer have tested these interrelationships using robust natural history datasets. In this study, we aimed to test current hypothesises regarding these relationships on both egg and clutch sizes among the Australian Anurans, which to date have not received this kind of investigation. Specifically, we looked at the influence of environmental selecting pressures (egg laying location, environment persistence and bioregion) and life history traits (adult female body size, egg development type, parental care level, breeding period and temporal breeding pattern). As expected, a clear inverse relationship was found between egg and clutch size, while female body size was positively related to both. Generally speaking, smaller clutches of larger eggs tended to be produced by species that i) oviposit terrestrially, ii) showcase direct development and iii) possess high levels of parental care. Temporal breeding pattern was strongly related to clutch size only, with large clutches occurring in explosive breeding species, while breeding habitat was strongly related to egg size only, with large eggs sizes occurring in terrestrial species.Altogether, these findings indicate that numerous factors have likely influenced the evolution of an optimal clutch type in this group, highlighting the importance of incorporating such variables into animal studies on egg and clutch sizes.

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Between semelparity and iteroparity: Empirical evidence for a continuum of modes of parity

Cited by 90 publications

References 355 publications

Delivering the promises of trait‐based approaches to the needs of demographic approaches, and vice versa

Delivering the promises of trait‐based approaches to the needs of demographic approaches, and vice versa

Seed traits are pleiotropically regulated by the flowering time gene PERPETUAL FLOWERING 1 (PEP1) in the perennial Arabis alpina

Quality versus quantity: The balance between egg and clutch size among Australian amphibians is related to life history and environmental conditions

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