Diurnal and seasonal trends of water relations in five co-occurring chasmophytic species

Gouvra, E; Grammatikopoulos, George

doi:10.1016/j.flora.2006.06.005

Cited by 4 publications

(5 citation statements)

References 20 publications

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“…This could help them to resist and withstand rock‐climbing disturbance. Additionally, some rupicolous plants have mechanisms to take up water more efficiently, including from drier substrates (Gouvra & Grammatikopoulos, ). Although the majority of these traits are related to the regulation of attachment to the substrate, water uptake and storage, some advantageous reproductive strategies can also be found.…”

Section: Discussionmentioning

confidence: 99%

An innovative vegetation survey design in Mediterranean cliffs shows evidence of higher tolerance of specialized rock plants to rock climbing activity

March‐Salas

Moreno-Moya

Palomar

et al. 2018

Applied Vegetation Science

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Questions: Is rock climbing pressure, together with microtopographic conditions, disturbing cliff plant cover and composition? What are the climbing impacts on rock specialist and non-specialist species? Can a case-control approach, not previously implemented in cliff environments, offer additional value for actual and long-term ecological research?Location: Chulilla, Levante coast, Spain. Methods:We surveyed in situ nine rock climbing routes in order to examine differences in plant species richness and vegetation cover between unclimbed and climbed transects. To evaluate the effect of rock climbing on vegetation, we implemented a case-control methodology using the two zones immediately adjacent to common climbing routes as control points (i.e. unclimbed transects). Three quadrats of 3 m × 3 m were established at different cliff heights. All identified species were categorized as either specialized rock species or non-specialized rock species based on their habitat preferences from literature. Non-specialized rock species were further differentiated as either moderately associated with rocky environments or strict generalists. The rock climbing impact on each group of species was analysed using LMM. Results:Our results provide evidence of the effects of rock climbing on a Mediterranean cliff, which has received little attention so far. Significantly fewer generalist species were present on climbed compared to unclimbed transects, while specialized and moderately specialized rock species were not significantly affected by rock climbing intensity. Furthermore, while rock-specific and moderately specialized species could cope with microsite heterogeneity, areas with fewer cracks had significantly negative effects on generalist species. Conclusions:Moderate rock climbing activity on cliff environments might not reduce the presence of specialized rock-dwelling species; however, this activity inherently impacts the biodiversity of cliff ecosystems due to its large effect on generalist species. We recommend that future conservation studies account for the degree of species dependence on rocky habitats to better understand rock-climbing impacts in these singular ecosystems. According to our experience, the implementation of an

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Section: Discussionmentioning

confidence: 99%

An innovative vegetation survey design in Mediterranean cliffs shows evidence of higher tolerance of specialized rock plants to rock climbing activity

March‐Salas

Moreno-Moya

Palomar

et al. 2018

Applied Vegetation Science

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“…Having excluded differences in light exposure and temperature through our sampling procedure, we hypothesize that it is water availability at different locations which influences photosynthetic machinery. Indeed, the photosynthesis of species growing on rocky substrates is strongly affected by Mediterranean drought during the summer [ 50 ]. Additionally, reproductive maturity is known to affect photosynthesis [ 51 ]; however, our results do not confirm this hypothesis.…”

Section: Discussionmentioning

confidence: 99%

Conservation of Micromeria browiczii (Lamiaceae), Endemic to Zakynthos Island (Ionian Islands, Greece)

Valli

Chondrogiannis

Grammatikopoulos

et al. 2021

Plants

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The massive decline in biodiversity due to anthropogenic threats has led to the emergence of conservation as one of the central goals in modern biology. Conservation strategies are urgently needed for addressing the ongoing loss of plant diversity. The Mediterranean basin, and especially the Mediterranean islands, host numerous rare and threatened plants in need of urgent conservation actions. In this study, we assess the current conservation status of Micromeria browiczii, a local endemic to Zakynthos Island (Ionian Islands, Greece), and estimate its future risk of extinction by compiling and assessing scientific information on geographical distribution, population dynamics and reproductive biology. The population size and the geographical distribution of the species were monitored for five years. The current population of the species consists of 15 subpopulations. Considerable annual fluctuation of population size was detected. The species is assessed as Endangered according to the International Union for Conservation of Nature threat categories. According to population viability analysis results, its extinction risk was estimated to be 5.6% over the next 50 years, when six of the fifteen subpopulations (40%) might become extinct. The investigation of certain aspects of the species’ biology yielded important data necessary to identify critical aspects for its survival and to propose conservation measures.

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“…As the soil dries, reduced hydraulic conductivity of the soil may also prevent equilibration (e.g., Gu et al 2006). In contrast, trans-cuticular absorption of water by leaves associated with heavy dew formation or light mists may occasionally artificially elevate  pd values (e.g., Gouvra and Grammatikopoulos 2007). However, it must be emphasized that these effects reflect variance in the ability of  pd to closely track soil water potential and do not reflect on the validity of this parameter as an indicator of the in situ base level of water stress experienced by the plant as it enters the next diurnal period.…”

Section:  Pd As a Measure Of Plant Water Stressmentioning

confidence: 99%

Impacts of precipitation variability on plant species and community water stress in a temperate deciduous forest in the central US

Pallardy

Hosman

et al. 2016

Agricultural and Forest Meteorology

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Variations in precipitation regimes can shift ecosystem structure and function by altering frequency, severity and timing of plant water stress. There is a need for predictively understanding impacts of precipitation regimes on plant water stress in relation to species water use strategies. Here we first formulated two complementary, physiologically-linked measures of precipitation variability (PV)-Precipitation Variability Index (PVI) and Average Recurrence Interval of Effective Precipitation (ARIEP). We then used nine-year continuous measurements of Predawn Leaf Water Potential Integral (PLWPI) in a central US forest to relate PVI and ARIEP to actual plant water availability and comparative water stress responses of six species with different capacities to regulate their internal water status. We found that PVI and ARIEP explained nearly all inter-annual variations in PLWPI for all species as well as for the community scaled from species measurements. The six species investigated showed differential sensitivities to variations in precipitation regimes. Their sensitivities were reflected more in the responses to PVI and ARIEP than to the mean precipitation rate. Further, they exhibited tradeoffs between responses to low and high PV. Finally, PVI and ARIEP were closely correlated with temporal integrals of positive temperature anomalies and vapor pressure deficit. We suggest that the comparative responses of plant species to PV are part of species-specific water use strategies in a plant community facing the uncertainty of fluctuating precipitation regimes. PVI and ARIEP should be adopted as key indices to quantify physiological drought and the ecological impacts of precipitation regimes in a changing climate.

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Diurnal and seasonal trends of water relations in five co-occurring chasmophytic species

Cited by 4 publications

References 20 publications

An innovative vegetation survey design in Mediterranean cliffs shows evidence of higher tolerance of specialized rock plants to rock climbing activity

An innovative vegetation survey design in Mediterranean cliffs shows evidence of higher tolerance of specialized rock plants to rock climbing activity

Conservation of Micromeria browiczii (Lamiaceae), Endemic to Zakynthos Island (Ionian Islands, Greece)

Impacts of precipitation variability on plant species and community water stress in a temperate deciduous forest in the central US

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