Integration of Demographic Annual Variability in a Clonal Desert Cactus

Mandujano, María C.; Montaña, Carlos; Franco, Miguel; Golubov, Jordan; Flores-Martínez, Arturo

doi:10.2307/2679864

Cited by 29 publications

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“…In clonal plants, clonal reproduction is often more important for population growth than sexual reproduction (Alfonso-Corrado et al 2007;Schleuning et al 2008) although the two reproductive modes seem to be of rather equal importance in some species (Damman and Cain 1998;Weppler et al 2006). However, it is not always easy to assess the relative importance of sexual and clonal reproduction for population growth as it can change under different environmental conditions (Mandujano et al 2001).…”

Section: Introductionmentioning

confidence: 99%

“…The relative importance of sexual and clonal reproduction for population growth and maintenance in clonal plants has been studied in a variety of species differing in life history and habitat requirements (e.g., Damman and Cain 1998;Mandujano et al 2001;Weppler et al 2006;AlfonsoCorrado et al 2007;Schleuning et al 2008). Many clonal plant species rarely recruit by seeds (Eriksson 1997) but there can be considerable variation among species (Eriksson 1992(Eriksson , 1997Silvertown et al 1993).…”

Section: Introductionmentioning

confidence: 99%

“…Matrix population models (Caswell 2001) are a powerful tool to assess the relative importance of plant vital rates, i.e., growth, survival, sexual and clonal reproduction, for population growth (e.g., Mandujano et al 2001;Weppler et al 2006;Jongejans et al 2008). To analyse the relative influence of different vital rates on the finite rate of population growth (k), prospective and retrospective analyses of matrix population models can be used (Caswell 2001).…”

Section: Introductionmentioning

confidence: 99%

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The relative importance of sexual and clonal reproduction for population growth in the perennial herb Fragaria vesca

et al. 2012

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The relative importance of sexual and clonal reproduction for population growth in clonal plants is highly variable. Clonal reproduction is often more important than sexual reproduction but there is considerable interspecific variation and the importance of the two reproductive modes can change with environmental conditions. We carried out a demographic study on the woodland strawberry (Fragaria vesca), a widespread clonal herb, at 12 sites in Switzerland during 2 years. Study sites were selected in two different habitats, i.e., forest and forest edge. We used periodic matrix models to estimate annual population growth rates and carried out prospective analyses to identify life cycle components that influence population growth rates most. Retrospective analyses were applied to study how the two different habitats affected population dynamics. Furthermore, we tested whether trade-offs between sexual and clonal reproduction occurred. There were large differences in annual population growth rates between sites and large within-site differences between years. Results of the prospective analyses clearly indicate that clonal reproduction is the dominant reproductive pathway whereas sexual reproduction is rather insignificant for population growth. Compared to forest habitats, forest edge habitats had higher population growth rates in the first year but smaller growth rates in the second year. We attribute these differing habitat effects to different water availabilities during consecutive years. No trade-offs between sexual and clonal reproduction were found. In conclusion, population growth of F. vesca relies heavily on clonal reproduction. Furthermore, reproduction and survival rates of F. vesca depend highly on spatio-temporal variation of environmental conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The relative importance of sexual and clonal reproduction for population growth in the perennial herb Fragaria vesca

et al. 2012

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“…Flexible investment into seedling production according to environmental conditions may have important effects on population dynamics and growth (Mandujano et al 2001;Clark-Tapia et al 2005;Marcante et al 2009). For example, this study demonstrated that C. americana populations experienced a decrease in sexual reproduction that corresponds to low-rainfall and nutrient-poor soil conditions.…”

Section: Discussionmentioning

confidence: 98%

“…However, the influence of environmental conditions on the population dynamics of sprouting woody plants is still not well known, especially in tropical areas (Bond and Midgley 2001). The relative contribution of sprouting to the population growth rate is not well described and often hard to evaluate (Dodd et al 2013), as this contribution may change with environmental conditions (Mandujano et al 2001). To address this question, the buds-protection-resources conceptual framework was proposed; within this framework, the effect of environmental resources on the role of sprouting can be explored (Clarke et al 2013).…”

Section: Introductionmentioning

confidence: 97%

The effects of resource availability on sprouting: a key trait influencing the population dynamics of a tree species

Lucena

Amorim

Lobo

et al. 2015

Trees

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Key message Sprouting is a key component of the population dynamics of woody species. Regeneration via sprouting contributes substantially to population growth when resource availability varies. Abstract Basal sprouting is an important trait that facilitates the persistence of woody species under different environmental conditions. Environmental heterogeneity can have variable effects on allocation to sexual reproduction and vegetative growth over an individual's ontogeny; consequently, environmental heterogeneity can influence the dynamics of woody plant populations. However, the effects of environmental factors on the ramet and genet dynamics of woody species have yet to be fully explored. This study investigated the population dynamics of Curatella americana L. (Dilleniaceae), an abundant tree species with a wide geographic distribution. The following hypotheses were tested: (1) density, vital rates and population growth rate are constrained by low rainfall and low soil fertility and (2) ramet production contributes more than seedling production to population growth at low rainfall levels and low soil fertility. Population dynamics were evaluated at two soil types (low and high fertility) over 3 years (2010, 2011 and 2012) with varying rainfall levels (average, average and low rainfall levels, respectively). Both hypotheses were supported. Vegetative growth and the population growth rate were limited by low rainfall and low soil fertility. The survival rates of adults and immature ramets had the largest effect on population growth. Although sprouting was limited by resource availability, this regeneration mode contributed more than seedlings to population growth. Basal sprouting not only ensures species persistence but also, as indicated by these results, permits a species to tolerate a lack of seedling recruitment. Basal sprouting was, therefore, determined to play an important role in the population growth of woody species in heterogeneous environments.

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The influence of herbivory and weather on the vital rates of two closely related cactus species

Sauby

Kilmer

Christman

et al. 2017

Ecology and Evolution

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Herbivory has long been recognized as a significant driver of plant population dynamics, yet its effects along environmental gradients are unclear. Understanding how weather modulates plant–insect interactions can be particularly important for predicting the consequences of exotic insect invasions, and an explicit consideration of weather may help explain why the impact can vary greatly across space and time. We surveyed two native prickly pear cactus species (genus Opuntia) in the Florida panhandle, USA, and their specialist insect herbivores (the invasive South American cactus moth, Cactoblastis cactorum, and three native insect species) for five years across six sites. We used generalized linear mixed models to assess the impact of herbivory and weather on plant relative growth rate (RGR) and sexual reproduction, and we used Fisher's exact test to estimate the impact of herbivory on survival. Weather variables (precipitation and temperature) were consistently significant predictors of vital rate variation for both cactus species, in contrast to the limited and varied impacts of insect herbivory. Weather only significantly influenced the impact of herbivory on Opuntia humifusa fruit production. The relationships of RGR and fruit production with precipitation suggest that precipitation serves as a cue in determining the trade‐off in the allocation of resources to growth or fruit production. The presence of the native bug explained vital rate variation for both cactus species, whereas the invasive moth explained variation only for O. stricta. Despite the inconsistent effect of herbivory across vital rates and cactus species, almost half of O. stricta plants declined in size, and the invasive insect negatively affected RGR and fruit production. Given that fruit production was strongly size‐dependent, this suggests that O. stricta populations at the locations surveyed are transitioning to a size distribution of predominantly smaller sizes and with reduced sexual reproduction potential.

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Integration of Demographic Annual Variability in a Clonal Desert Cactus

Cited by 29 publications

References 0 publications

The relative importance of sexual and clonal reproduction for population growth in the perennial herb Fragaria vesca

The relative importance of sexual and clonal reproduction for population growth in the perennial herb Fragaria vesca

The effects of resource availability on sprouting: a key trait influencing the population dynamics of a tree species

The influence of herbivory and weather on the vital rates of two closely related cactus species

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