New insights into the ecology and phenology of two Characeae: N. opaca (Bruzelius) C. Agardh and N. gracilis (Sm.) C. Agardh

Joye, Dominique; Boissezon, Aurélie

doi:10.1080/23818107.2017.1365259

Cited by 12 publications

(5 citation statements)

References 34 publications

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“…The owering period is well known to in uence niche differentiation among closely related species (Levin 2009), a pattern that has also been observed in wetland plant communities (Bell and Clarke 2004;Auderset Joye and Boissezon 2018). Our index of the owering period of the communities of the different Lythrum species showed only slight differences among the six species of Lythrum, although differences were low and poorly signi cant in pairwise comparisons.…”

Section: Phenological Niche Differencessupporting

confidence: 59%

“…The study of the micro-niche revealed marked differentiation among species in their ecological niche on a ne scale. In addition to hydrology, an important driver of plant distribution in temporary pools (Jeffries 2008;Rhazi et al 2009;Caria et al 2013;Minissale and Sciandrello 2016) and niche differentiation (Silvertown 2004;Emery et al 2012;Silvertown et al 2015;Auderset Joye and Boissezon 2018), our study provides strong evidence of niche differentiation among species in relation to edaphic parameters. Although L. portula and L. borysthenicum showed only low levels of variation in ecological conditions between each other, they showed marked differentiation from the other species in our study.…”

Section: Spatial Niche Differentiationmentioning

confidence: 69%

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Ecological Niche Differentiation Among Six Annual Lythrum Species in Mediterranean Temporary Pools

Gazaix

Grillas

PAPUGA

et al. 2021

Preprint

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The ecological niche defines the favorable range of a species in a multidimensional space of ecological factors that determine the presence and function of individuals. This fundamental concept in ecology is widely used to understand plant species coexistence and segregation. In this study we test for ecological differentiation among six annual Lythrum species that are characteristic of temporary pools in the South of France, where they either coexist or occur separately. We first analysed the co-occurrence of species at two different geographical scales: cluster analyses of species presence in 10 km grid cells and coexistence in 0.25m2 quadrats within populations of each species. Second, for three to nine populations of each species, we quantified a range of biotic and abiotic parameters using point contacts and soil measurements in three 0.25m2 quadrats per population. We performed PCA on all variables, and analysed each variable separately to compare the ecological niche features of the six species. A phenological index was assessed for the plant community of each site. We detected highly localised niche differentiation in terms of soil pH (all species) and for a range of variables among pairs of species. The six species also showed marked differences in flowering period relative to the mean and variability of flowering time in their local community. These fine-scaled niche differences are associated with phylogenetic distances among species and may contribute to species’ coexistence. These results are integrated in a conservation management plan for the habitat of the rarest species in this group.

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Section: Phenological Niche Differencessupporting

confidence: 59%

Section: Spatial Niche Differentiationmentioning

confidence: 69%

Ecological Niche Differentiation Among Six Annual Lythrum Species in Mediterranean Temporary Pools

Gazaix

Grillas

PAPUGA

et al. 2021

Preprint

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show abstract

“…Several life‐history traits of the species, such as the breeding system (monoecy versus dioecy), are related to the different allocation of resources and can explain these distinct phenologies (Casanova & Brock, ). Species‐specific phenological patterns in charophytes were already identified from a preliminary analysis of data from these ponds (Calero et al, ), and from previous studies (Auderset Joye & Boissezon, ; Bonis et al, ; Casanova & Brock, ; Wang, Liu, & Yu, ).…”

Section: Discussionmentioning

confidence: 82%

“…Therefore, understanding the environmental cues that determine the production of charophyte propagules is crucial for the conservation of many species and the future of some vulnerable habitats. Sexual reproduction in charophytes seems to be stimulated by rising temperatures and decreasing water levels (Asaeda, Rajapakse, & Sanderson, ; Auderset Joye & Boissezon, ; Casanova, ; Casanova & Brock, ). Therefore, their reproductive phenology could be used to track climate change effects in aquatic ecosystems (Calero et al, , ).…”

Section: Introductionmentioning

confidence: 99%

Persistence of submerged macrophytes in a drying world: Unravelling the timing and the environmental drivers to produce drought‐resistant propagules

Calero

Morellato

Rodrigo

2018

Aquatic Conservation

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Under a warming scenario many permanent inland water bodies in the Mediterranean region have become temporary ones, so the persistence of submerged macrophytes depends on the timely production of drought‐resistant propagules. Phenological research measures the timing of ecological processes and allows the consequences of disturbances such as climate change to be evaluated. Among macrophytes, the charophytes are widely distributed benthic macroalgae and are particularly sensitive to environmental variations. The systems in which they live constitute valuable, threatened, and protected habitats (European Habitats Directive code 3140). This study established a methodological basis for determining which environmental drivers trigger the sexual reproductive phenology of charophytes. For the first time, circular statistics were applied to describe and compare seasonal patterns for submerged macrophytes. Over a period of 2 years, three charophyte species growing in two Mediterranean brackish ponds were monitored. Most of the sexual reproduction occurred during spring and summer, including the production of drought‐resistant propagules, before the harshest conditions arrived. Each species showed a distinctive phenological pattern, according to specific breeding systems, life cycles, and environmental tolerances and requirements. Deeper conditions and higher salinities delayed reproduction. Different rainfall intensities in autumn produced distinctions between years, as stronger rainfall reduced the salinity stress and stimulated the reproduction of plants. Interacting factors act as cues for charophyte reproduction and cause antagonistic effects on propagule production. Among them, the heat required for each phenophase peak is essential for understanding the phenology of a population and for predicting its long‐term persistence. Charophytes appear to be good candidates for tracking climate change in shallow ecosystems. Further phenological studies should consider more species, populations, and long‐term observations in order to predict climate‐change effects on water bodies, and to develop effective plans for management and conservation. Circular statistics is a potential tool for analysing phenology in the context of global warming, as well as for many other conservation issues.

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“…This finding is corroborated by other studies which found rare species the following years after a drought (Collinson et al, 1995;Engelhardt, 2006) As an example, this pond bed air exposure facilitates Charophytes development as Nitella sp. with some species at risk of extinction in Europe (Auderset & Boissezon, 2018). The influence of regular dry periods on a pond's ecosystem can thus be seen as a necessary and beneficial pressure for the development of aquatic plant community.…”

Section: Resilience Of the Plant Community To Severe Droughtmentioning

confidence: 99%

Disturbance and resilience of aquatic plant communities in fish ponds after temporary dry periods

et al. 2023

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for their assistance on the field and in the laboratory. This publication is the result of many years of field works supported by ISARA team. A special thanks to Fondation Vérots for giving their consent for access to their ponds. Appreciation is also expressed to the fish farmers who made possible the present study Data Availability statementThe datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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New insights into the ecology and phenology of two Characeae: N. opaca (Bruzelius) C. Agardh and N. gracilis (Sm.) C. Agardh

Cited by 12 publications

References 34 publications

Ecological Niche Differentiation Among Six Annual Lythrum Species in Mediterranean Temporary Pools

Ecological Niche Differentiation Among Six Annual Lythrum Species in Mediterranean Temporary Pools

Persistence of submerged macrophytes in a drying world: Unravelling the timing and the environmental drivers to produce drought‐resistant propagules

Disturbance and resilience of aquatic plant communities in fish ponds after temporary dry periods

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