The anatomy of two species of emergent macrophytes of the genus Polygonum differentially changes in response to water level fluctuations

Ecohydrology ◽  
2021 ◽  
Author(s):  
Rafaela Santos Machado ◽  
Vanessa Carvalho Harthman ◽  
Raytha Assis Murillo ◽  
Sidinei Magela Thomaz ◽  
Márcio José Silveira
Keyword(s):  
Water Level ◽  
Water Level Fluctuations ◽  
Emergent Macrophytes ◽  
Response To Water

scholarly journals RESERVOIR COAST RESPONSE TO WATER LEVEL FLUCTUATIONS

2015 ◽  
pp. 61
Author(s):  
A. Sh. Khabidov ◽  
K. V. Marusin ◽  
L. A. Zhindarev ◽  
E. A. Fedorova ◽  
E. A. Sviridova
Keyword(s):  
Water Level ◽  
Water Level Fluctuations ◽  
Response To Water

scholarly journals Influence of water level fluctuation on the mortality and aboveground biomass of the aquatic macrophyte Eleocharis interstincta (VAHL) roemer et schults

2004 ◽  
Vol 47 (2) ◽  
pp. 281-290 ◽  
Author(s):  
Anderson Medeiros dos Santos ◽  
Francisco de Assis Esteves
Keyword(s):  
Water Level ◽  
Aboveground Biomass ◽  
Aquatic Macrophyte ◽  
Sampling Period ◽  
Water Level Fluctuations ◽  
Northern Coast ◽  
Significant Difference ◽  
Influence Of Water ◽  
Response To Water

The goal of this study was to study the biometric alterations of Eleocharis interstincta in response to water level fluctuations in Cabiúnas Lagoon, located on the northern coast of the state of Rio de Janeiro, in the municipality of Macaé. Three quadrats of 0.0625 m² were harvested every two weeks from June/1997 to June/1998; samples were separated into stems, dead stems (detritus) and rhizome; lenghted, dried and weighted. The water level fluctuated seasonally in the macrophyte stand with two periods of drawdown. The first period occurred naturally at the end of winter and beginning of spring, when rainfall in the area was normally lowest. The second period of drawdown was the result of an artificial breaching of the sandbar that isolate the lagoon from the sea. The breach was made in the summer, at the time of highest rainfall, when the water level in the lagoon reached the maximum value recorded during the study (1.35 m). There was a strongly positive correlation of the water level with stems mean height and aboveground biomass, indicating that water level played an important role in the determination of these parameters. There was a significant difference between stem height (ANOVA; p < 0.001) and biomass (ANOVA; p < 0.001) in each sampling period, ranging from 143.9 cm and 338.8 g dry wt.m-2, before the sandbar opening, to 16.3 cm and 20.2 g dry wt.m-2 respectively after the sandbar breaching. The drastic variation of the water level, leading mass mortality of the stems, together with the lowest mean biomass/stem (0.057 g dry wt.individual-1), recorded after the sandbar breaching, did not represent a strong disturbance for E. interstincta, since the resilience time estimated for this population was about 30 days.

Primary production and mortality of Eleocharis interstincta in response to water level fluctuations

2002 ◽  
Vol 74 (3) ◽  
pp. 189-199 ◽  
Author(s):  
Anderson Medeiros dos Santos ◽  
Francisco de Assis Esteves
Keyword(s):  
Primary Production ◽  
Water Level ◽  
Water Level Fluctuations ◽  
Response To Water

Vegetative and reproductive responses of charophytes to water-level fluctuations in permanent and temporary wetlands in Australia

1994 ◽  
Vol 45 (8) ◽  
pp. 1409 ◽  
Author(s):  
MT Casanova
Keyword(s):  
Sexual Reproduction ◽  
Water Level ◽  
Important Determinant ◽  
Dry Weight ◽  
Water Levels ◽  
Water Level Fluctuations ◽  
Water Level Changes ◽  
Sexual Responses ◽  
Chara Australis ◽  
Response To Water

Chara australis responded to changes in water levels by altering its morphology and allocation of resources. In a field harvest experiment, vegetative vigour of C. australis was greatest after water-level rises and the overall morphology of the plants varied depending upon season and site of collection. Allocation of dry weight varied over time, but allocation to sexual reproduction was always less than 10% of the total in this dioecious perennial species. C. australis reproduced sexually through the spring, summer and autumn, and where water levels were continually decreasing more female than male shoots were present. Field growth rates increased when depth was increased, and sexual reproduction was stimulated when water levels fell. An annual charophyte species (Nitella sonderi) did not display significant vegetative or sexual responses to water-level changes. The results of these experiments show that charophyte species can display morphological and reproductive plasticity in response to water level changes, although as charophytes are not uniform in their adaptations to fluctuations, results from one species cannot be extrapolated to another species. Life history could be a more important determinant of vegetative and reproductive characteristics than is phylogenetic affinity.

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