Different responses of coexisting Chara species to foreseeable Mediterranean temperature and salinity increases

Rojo, Carmen; Carramiñana, María; Cócera, Daniel; Roberts, Gwen Page; Puche, Eric; Calero, Sara; Rodrigo, María A.

doi:10.1016/j.aquabot.2017.01.003

Cited by 27 publications

(28 citation statements)

References 62 publications

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“…Thus, we can confirm that warming conditions counteracted the charophytes stress due to the foreseeable consequences of climatic change in the Mediterranean region (i.e., the loss of water level), with the consequent increase in UVR and the concentration of solutes stressing the benthic macroalgae (Rojo et al. ).…”

Section: Discussionsupporting

confidence: 56%

“…However, this acceleration of metabolism due to a temperature increase could imply a potential metabolic cost (Rojo et al. ) that prevented charophytes from producing other needed molecules, such as UVACs. Therefore, some trade‐off should be taken into account in the molecular response to UVR mediated by temperature; the photorepair mechanisms have been described as temperature–dependent while the photochemical damage processes are independent of temperature (Li et al.…”

Section: Discussionmentioning

confidence: 99%

“…, Rojo et al. , , Rubio et al. ) it has been demonstrated that these conditions are non‐limiting to the growth of charophytes.…”

Section: Methodsmentioning

confidence: 98%

“…), and was used before in other experiments on the effects of warming on charophytes (Rojo et al. , ). Therefore, the combination of radiation and T treatments resulted in four conditions: PAR‐LT, PAR‐HT, PAB‐LT, and PAB‐HT.…”

Section: Methodsmentioning

confidence: 99%

“…In fact, there are few studies concerning the effects of temperature on these macroalgae (Anderson and Lommasson , Rojo et al. , ) and few focus on the interaction between UVR and other stressors (Cabello‐Pasini et al. , Heinrich et al.…”

mentioning

confidence: 99%

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The antagonistic effect of UV radiation on warming or nitrate enrichment depends on ecotypes of freshwater macroalgae (Charophytes)

Rojo

Puche

Rodrigo

2019

Journal of Phycology

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Increases in ultraviolet radiation (UVR), a negative global change factor, affect aquatic primary producers. This effect is expected to be modulated by other global change factors, and to be different for populations adapted to different environments. A common garden experimental approach using freshwater green macroalgae, the cosmopolitan charophyte species Chara hispida and C. vulgaris, allowed us to test whether the beneficial increases in water temperature (T) and nitrate concentration (N) mitigate negative UVR effects. Also, whether these interactions would be not only species–specific but also according to the origin of the population; therefore, two populations of each species were used: one from a coastal wetland and the other from a mountain lake. Two factorial‐design experiments were performed: (i) the presence and absence of UVR × lower and higher T × four populations, and (ii) the presence and absence of UVR × lower and higher N × four populations. Response variables were: growth, morphometry, UVR‐protective compounds, photosynthetic pigments, and stoichiometric composition. There were consistent response patterns in the key variables that represent different organization levels. Our main results showed that both warming and, to a lesser extent, the increase in nutrients ameliorated the negative effects of UVR on the molecular processes involved in acclimation to UVR, and that such a mitigating effect depended on the different phenotypic plasticity of each species and each ecotype. The coastal populations, being from a more variable environment, were more resilient than the mountain populations, mainly because of changes in growth and morphology.

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Section: Discussionsupporting

confidence: 56%

Section: Discussionmentioning

confidence: 99%

“…, Rojo et al. , , Rubio et al. ) it has been demonstrated that these conditions are non‐limiting to the growth of charophytes.…”

Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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The antagonistic effect of UV radiation on warming or nitrate enrichment depends on ecotypes of freshwater macroalgae (Charophytes)

Rojo

Puche

Rodrigo

2019

Journal of Phycology

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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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Preliminary evidence of an endangered species benefiting from moderate climate warming: A palaeolimnological study of the charophyte Lychnothamnus barbatus

Brzozowski

Kowalewski

Szczuciński

et al. 2021

Aquatic Conservation

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In a time of rapid environmental changes, identification of the effects of climate warming on charophytes (Characeae, Charophyta) will enable the optimization of conservation measures, especially for extremely rare species. Lychnothamnus barbatus is one of the rarest charophytes worldwide, which has decreased in the number of occupied sites over the last century. However, the recolonization of former sites has been observed in recent years (e.g. Lake Kuźnickie, Poland). The study aimed to analyse the effects of climatic changes and human pressure on the L. barbatus population. Three 30 cm sediment cores were collected from minimum, average, and maximum depths of L. barbatus occurrence to determine the past vegetation composition. Sediment cores were dated using the radioisotopes lead‐210, caesium‐137, and carbon‐14. A spatial analysis of the lake catchment changes during the last 120 years was also conducted. The study demonstrated L. barbatus presence in Lake Kuźnickie at the beginning of the 16th century. However, a sharp increase in the proportion of this species in the vegetation community occurred in the 19th century and during climate warming at the end of the Little Ice Age. Factors that significantly influenced the present occurrence of the L. barbatus population included improvement in water quality and the oospore bank deposited in the bottom sediments. This study is the first palaeoreconstruction in a modern lake dominated by L. barbatus. Based on the history of L. barbatus in Lake Kuźnickie after the end of the Little Ice Age, the positive effect of climate warming on the contemporary recovery of this charophyte is postulated. The reaction of L. barbatus to climate warming appears to differ from commonly accepted scenarios for aquatic macrophytes because its recovery in the past and at present coincided with increases in air temperature. This research indicated the appropriate management and conservation practices for lakes with L. barbatus populations.

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Different responses of coexisting Chara species to foreseeable Mediterranean temperature and salinity increases

Cited by 27 publications

References 62 publications

The antagonistic effect of UV radiation on warming or nitrate enrichment depends on ecotypes of freshwater macroalgae (Charophytes)

The antagonistic effect of UV radiation on warming or nitrate enrichment depends on ecotypes of freshwater macroalgae (Charophytes)

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

Preliminary evidence of an endangered species benefiting from moderate climate warming: A palaeolimnological study of the charophyte Lychnothamnus barbatus

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