Intracellular and extracellular ammonium (NH4 +) uptake and its toxic effects on the aquatic biomonitor Fontinalis antipyretica

Vieira, Ana Rute; Gonzalez, Carla; Martins-Loução, Maria Amélia; Branquinho, Cristina

doi:10.1007/s10646-009-0374-6

Cited by 15 publications

(8 citation statements)

References 27 publications

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“…Gross photosynthesis values varied greatly, depending on the collection time, previous weather conditions (Vieira et al 2009), time in the laboratory, etc. Accordingly, a pool of 174 replicate samples from the control population, corresponding to four different collection periods, were used to establish the control value for gross photosynthesis and chlorophyll a fluorescence.…”

Section: Discussionmentioning

confidence: 99%

Physiological consequences of desiccation in the aquatic bryophyte Fontinalis antipyretica

Carvalho

Branquinho

Silva

2011

Planta

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The moss Fontinalis antipyretica, an aquatic bryophyte previously described as desiccation-intolerant, is known to survive intermittent desiccation events in Mediterranean rivers. To better understand the mechanisms of desiccation tolerance in this species and to reconcile the apparently conflicting evidence between desiccation tolerance classifications and field observations, gross photosynthesis and chlorophyll a fluorescence were measured in field-desiccated bryophyte tips and in bryophyte tips subjected in the laboratory to slow, fast, and very fast drying followed by either a short (30 min) or prolonged (5 days) recovery. Our results show, for the first time, that the metabolic response of F. antipyretica to desiccation, both under field and laboratory conditions, is consistent with a desiccation-tolerance pattern; however, drying must proceed slowly for the bryophyte to regain its pre-desiccation state following rehydration. In addition, the extent of dehydration was found to influence metabolism whereas the drying rate determined the degree of recovery. Photosystem II (PSII) regulation and structural maintenance may be part of the induced desiccation tolerance mechanism allowing this moss to recover from slow drying. The decrease in the photochemical quenching coefficient (qP) immediately following rehydration may serve to alleviate the effects of excess energy on photosystem I (PSI), while low-level non-photochemical quenching (NPQ) would allow an energy shift enabling recovery subsequent to extended periods of desiccation. The findings were confirmed in field-desiccated samples, whose behavior was similar to that of samples slowly dried in the laboratory.

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Section: Discussionmentioning

confidence: 99%

Physiological consequences of desiccation in the aquatic bryophyte Fontinalis antipyretica

Carvalho

Branquinho

Silva

2011

Planta

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“…Also, bryophyte communities typically segregate along an upstream–downstream gradient of habitat conditions and water quality, which promotes their use as direct bioindicators (Vanderpoorten 2003). For instance, Fontinalis antipyretica is used to monitor aquatic pollution (Vieira et al. 2009), to reveal the effects of UV‐B radiation (Nunez‐Oliveira et al.…”

Section: Introductionmentioning

confidence: 99%

Spatial genetic structure of aquatic bryophytes in a connected lake system

et al. 2012

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Using genetic markers, we investigated the genetic structure of three clonal aquatic moss species, Calliergon megalophyllum Mikut., Fontinalis antipyretica Hedw. and F. hypnoides Hartm. on two scales: among populations in a connected lake system (large-scale spatial genetic structure) and among individuals within populations (fine-scale spatial genetic structure). Mean genetic diversities per population were 0.138, 0.247 and 0.271, respectively, and total diversities equalled 0.223, 0.385 and 0.421, respectively. Relative differentiation levels (FST values of 0.173, 0.280 and 0.142, respectively) were significant but showed that there is a moderate amount of gene flow taking place within the lake system connected with narrow streams. Bayesian STRUCTURE analysis provided some indication that the direction of water flow influences population genetic structuring in the studied aquatic mosses. We propose that dispersal leading to gene flow in C. megalophyllum, F. antipyretica and F. hypnoides takes place both along water via connecting streams and by animal vectors, such as waterfowl. Nevertheless, the slight genetic structuring pattern along the direction of water flow suggests that dispersal of shoots or their fragments along water is a means of dispersal in these mosses. The absence of sexual reproduction and spores may have caused the observed spatial genetic structure within populations, including aggregations of similar genotypes (clones or closely related genotypes) at short distances in populations otherwise showing an isolation by distance effect. Regardless of the results pointing to the dominance of vegetative propagation, it is impossible to completely rule out the potential role of rare long-distance spore dispersal from areas where the species are fertile.

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“…In this work the NH 4 + concentrations ranged from 369.9 to 1,027.5 µg l −1 . Ammonium, NO 3 − and PO 4 3− concentration can be toxic to plants and to aquatic life (Britto and Kronzucker 2002;Vieira et al 2009): toxicity is restricted to combinations of extremely high nutrient concentrations and oxygen depletion. Thus toxicity is unlikely to explain much of the effect of NH 4 + on the QBR index.…”

Section: Discussionmentioning

confidence: 99%

“…Direct, as well as, indirect effects occur. Toxicity is one aspect of eutrophication that has a direct effect on the functioning of organisms in the ecosystem (Nijboer and Verdonschot 2004;Vieira et al 2009). In many cases increasing nutrient levels result in indirect effects causing shifts in the species composition, for example in the benthic algal layer or among the higher plant communities, by altering the competitive balance between species (Lyon and Gross 2005;Mainstone and Parr 2002;Pinho et al 2009).…”

Section: Introductionmentioning

confidence: 99%

The Impact of the Rural Land-Use on the Ecological Integrity of the Intermittent Streams of the Mediterranean 2000 Natura Network

Branquinho

Gonzalez

Clemente

et al. 2014

Nitrogen Deposition, Critical Loads and Biodiversity

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The main objective was to understand the impact of the neighbouring land-use and of water pollution on the integrity of the riparian vegetation in intermittent Mediterranean streams of the 2000 Natura network in a rural area. The ecological integrity of the riparian vegetation of intermittent streams in the Mediterranean was negatively associated with the aquatic NH 4 + concentration, which might a consequence of direct and indirect effects. There was a significant increase in frequency of exotic shrub species with increasing PO 4 3− concentration in stream waters and high NO 3 − concentrations in stream waters did not affected the QBR index or its components. Despite occupying a large area, pastures were not a source of eutrophication elements to the stream waters. Agricultural prac-M. A. Sutton et al. (eds.), Nitrogen Deposition, Critical Loads and Biodiversity,

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Intracellular and extracellular ammonium (NH4 +) uptake and its toxic effects on the aquatic biomonitor Fontinalis antipyretica

Cited by 15 publications

References 27 publications

Physiological consequences of desiccation in the aquatic bryophyte Fontinalis antipyretica

Physiological consequences of desiccation in the aquatic bryophyte Fontinalis antipyretica

Spatial genetic structure of aquatic bryophytes in a connected lake system

The Impact of the Rural Land-Use on the Ecological Integrity of the Intermittent Streams of the Mediterranean 2000 Natura Network

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