Habitat requirements of charophytes—Evidence of species discrimination through distribution analysis

Rey-Boissezon, Aurélie; Joye, Dominique

doi:10.1016/j.aquabot.2014.05.007

Cited by 42 publications

(21 citation statements)

References 29 publications

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“…This suggests that other factors, such as a mean temperature that is too high, or the occurrence of heat waves (Li et al, ), affected the phenological pattern of the species. A complex interaction between the specific life‐history traits and the species‐specific environmental requirements and tolerances (Rey‐Boissezon & Auderset Joye, ) may explain the observed divergent phenological patterns when several species coexist within an ecosystem under the same ecological conditions (Figure a).…”

Section: Discussionmentioning

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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Section: Discussionmentioning

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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“…). Since C. virgata typically occurs in Calcium poor habitats, while C. strigosa typically occurs in Calcium rich habitats (Rey‐Boissezon and Auderset Joye ), these taxa may well “evolve separately” in spite of their genetic similarity. Clearly, more data are needed to clarify the taxonomic status of these taxa.…”

Section: Discussionmentioning

confidence: 99%

“…() showed that stress, for example chemical induction of herbivore and pathogen defenses, can trigger considerable variation in methylation of plant DNA. Consequently, habitat salinity ( C. baltica and C. horrida typically occur in brackish water habitats, while the other taxa in cluster I typically occur in freshwater habitats) or Ca‐concentration ( C. virgata : Calcium poor habitats, C. strigosa : Calcium rich habitats; Rey‐Boissezon and Auderset Joye ) may also be related to epigenetic variation. A third explanation for phenotypic modifications in the absence of differences in DNA barcodes may be polyploidy (Schranz and Osborn ).…”

Section: Discussionmentioning

confidence: 99%

DNA barcoding the genus Chara: molecular evidence recovers fewer taxa than the classical morphological approach

Schneider

Rodrigues

Moe

et al. 2015

Journal of Phycology

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Charophytes (Charales) are benthic algae with a complex morphology. They are vulnerable to ecosystem changes, such as eutrophication, and are red-listed in many countries. Accurate identification of Chara species is critical for understanding their diversity and for documenting changes in species distribution. Species delineation is, however, complicated, because of high phenotypic plasticity. We used barcodes of the ITS2, matK and rbcL regions to test if the distribution of barcode haplotypes among individuals is consistent with species boundaries as they are currently understood. The study included freshly collected and herbarium material of 91 specimens from 10 European countries, Canada and Argentina. Results showed that herbarium specimens are useful as a source of material for genetic analyses for aquatic plants like Chara. rbcL and matK had highest sequence recoverability, but rbcL had a somewhat lower discriminatory power than ITS2 and matK. The tree resulting from the concatenated data matrix grouped the samples into six main groups contrary to a traditional morphological approach that consisted of 14 different taxa. A large unresolved group consisted of C. intermedia, C. hispida, C. horrida, C. baltica, C. polyacantha, C. rudis, C. aculeolata, and C. corfuensis. A second unresolved group consisted of C. virgata and C. strigosa. The taxa within each of the unresolved groups shared identical barcode sequences on the 977 positions of the concatenated data matrix. The morphological differences of taxa within both unresolved groups include the number and length of spine cells, stipulodes, and bract cells. We suggest that these morphological traits have less taxonomic relevance than hitherto assumed.

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“…Calcium was identified as having the greatest relative contribution to distributions of most species of Characeae in the present study across the northeastern USA. In Europe, variation in calcium concentrations has been identified as discriminating among Characeae habitats, with calcifuge and calciphile species being described (Auderset Joye & Rey‐Boissezon, ; Olsen, ; Rey‐Boissezon & Auderset Joye, ; Stroede, ). Calcium can be regarded as a resource variable as it is a required nutrient; however, this element also serves as a direct variable in models, as an indicator of bedrock substrate and water hardness.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies have found evidence of species–environment relationships within macrophyte communities (Auderset Joye & Rey‐Boissezon, ; Baastrup‐Spohr, Iversen, Borum, & Sand‐Jensen, ; Chappuis, Gacia, & Ballesteros, ; Escobar, Qiao, Phelps, Wagner, & Larkin, ; Heegaard, Birks, Gibson, Smith, & Wolfe‐Murphy, ; Lambert‐Servien, Clemenceau, Gabory, Douillard, & Haury, ; Midwood, Darwin, Ho, Rokitnicki‐Wojcik, & Grabas, ; Rey‐Boissezon & Auderset Joye, ; Torn, Kovtun‐Kante, Herkül, Martin, & Mäemets, ; Wood, ). Rey‐Boissezon and Auderset Joye () used multivariate analyses with nine chemical and environmental factors across Switzerland to identify specialist and generalist species within the Characeae. Torn et al.…”

Section: Introductionmentioning

confidence: 98%

Untangling climate and water chemistry to predict changes in freshwater macrophyte distributions

Sleith

Wehr

Karol

2018

Ecology and Evolution

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Forecasting changes in the distributions of macrophytes is essential to understanding how aquatic ecosystems will respond to climate and environmental changes. Previous work in aquatic ecosystems has used climate data at large scales and chemistry data at small scales; the consequence of using these different data types has not been evaluated. This study combines a survey of macrophyte diversity and water chemistry measurements at a large regional scale to demonstrate the feasibility and necessity of including ecological measurements, in addition to climate data, in species distribution models of aquatic macrophytes. A survey of 740 water bodies stratified across 327,000 square kilometers was conducted to document Characeae (green macroalgae) species occurrence and water chemistry data. Chemistry variables and climate data were used separately and in concert to develop species distribution models for ten species across the study area. The impacts of future environmental changes on species distributions were modeled using a range of global climate models (GCMs), representative concentration pathways (RCPs), and pollution scenarios. Models developed with chemistry variables generally gave the most accurate predictions of species distributions when compared with those using climate variables. Calcium and conductivity had the highest total relative contribution to models across all species. Habitat changes were most pronounced in scenarios with increased road salt and deicer influences, with two species predicted to increase in range by >50% and four species predicted to decrease in range by >50%. Species of Characeae have distinct habitat ranges that closely follow spatial patterns of water chemistry. Species distribution models built with climate data alone were insufficient to predict changes in distributions in the study area. The development and implementation of standardized, large‐scale water chemistry databases will aid predictions of habitat changes for aquatic ecosystems.

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Habitat requirements of charophytes—Evidence of species discrimination through distribution analysis

Cited by 42 publications

References 29 publications

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

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

DNA barcoding the genus Chara: molecular evidence recovers fewer taxa than the classical morphological approach

Untangling climate and water chemistry to predict changes in freshwater macrophyte distributions

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