Hydrological complexity supports high phytoplankton richness in the Doñana marshland (SW Spain)

Reyes, Isabel; Casco, María Adela; Toja, Julia; Serrano, Laura

doi:10.1007/s10750-008-9535-5

Cited by 11 publications

(6 citation statements)

References 23 publications

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“…During the peak of the MoN, when the estuary was at its freshest, phytoplankton biomass was on the lower side, but surprisingly the community was made up of the largest number of species. Similar observations are also reported from other regions of Donana marshland (SW Spain) and Paraibado Sul river estuary (SE Brazil) by Reys et al (2008) and Costa et al (2009), where species richness is driven by the influence of the freshwater flow in to the estuary. This was due to enhancing the replacement of the species and causing lower phytoplankton biomass.…”

Section: Discussionsupporting

confidence: 88%

Fine-scale responses of phytoplankton to freshwater influx in a tropical monsoonal estuary following the onset of southwest monsoon

et al. 2011

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In May of 2007, a study was initiated by the National Institute of Oceanography (NIO), Goa, India, to investigate the influence of monsoonal rainfall on hydrographic conditions in the Mandovi River of India. The study was undertaken at a location ∼2 km upstream of the mouth of this estuary. During the premonsoon (PreM) in May, when circulation in the estuary was dominated by tidal activity, phytoplankton communities in the high saline (35-37 psu) waters at the study site were largely made up of the coastal neritic species Fragilaria oceanica, Ditylum brightwellii and Trichodesmium erythraeum. During the later part of the intermonsoon (InterM) phase, an abrupt decline in salinity led to a surge in phytoplankton biomass (Chlorophyll a ∼14 mg m −3 ), of a population that was dominated by Thalassiosira eccentricus. As the southwest monsoon (SWM) progressed and the estuary freshened salinity and Chlorophyll a (Chl a) concentrations decreased during the MoN, Skeletonema costatum established itself as the dominant form. Despite the low biomass (Chl a <2 mg m −3 ), the phytoplankton community of the MoN was the most diverse of the entire study. During the postmonsoon (PostM), the increase in salinity was marked by a surge in dinoflagellate populations comprising of Ceratium furca, Akashiwo sanguinea, and Pyrophacus horologium.

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Section: Discussionsupporting

confidence: 88%

Fine-scale responses of phytoplankton to freshwater influx in a tropical monsoonal estuary following the onset of southwest monsoon

et al. 2011

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“…This is in accordance with Margalef's (1976) findings of a negligible influence of salinity in the distribution patterns of microalgae in Doñana. However, algal cumulative richness in these ponds is relatively high irrespective of hydrologic variability (Serrano et al 2006, Reyes et al 2008). Indeed, temporary ponds are commonly believed to support a restricted number of taxa due to their intrinsic constraints, e.g.…”

Section: Discussionmentioning

confidence: 99%

“…their relatively small surface area reduces the likelihood of propagules arriving at a given site (Frisch et al 2006), including the zoochory by waterfowl, which play a major role in the dispersal of diatoms (Coste and Ector 2000) so that inhabiting algal communities tend to be composed of cosmopolitan species able to cope with wide variations in salinity, turbidity, and eutrophy (Reyes et al 2007). However, the influence of alloch thonous flora is commonly overlooked despite different water inputs that allow the colonization of organisms from different origins (Reyes et al 2008). Temporary water bodies probably play a key role as evolutionary scenarios (Margalef 1983) and, within diatoms, their characteristic strong environmental changes can promote the evolution of locally adapted lines that eventually speciate (Shayler and Siver 2004).…”

Section: Discussionmentioning

confidence: 99%

“…Shallow lakes, wetlands and ponds are now widely recognized as important biodiversity resources (Wetzel 2001, Bécares et al 2004, Della Bella and Mancini 2009). In coastal wetlands, primary producers are expected to cope with a wide variation in salinity, turbidity and nutrient concentrations (Reyes et al 2008) and, in areas dominated by a Mediterranean climate, this variability is often arranged in flooding and drying periods according to water availability (Reyes et al 2007). Additionally, such temporary water bodies are inhabited by species with a lifecycle that allows survival through the terrestrial period or recolonization after adverse periods (Frisch et al 2006).…”

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confidence: 99%

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The diatom flora in temporary ponds of Doñana National Park (southwest Spain): five new taxa

Blanco

Álvarez-Blanco

Cejudo-Figueiras

et al. 2013

Nordic Journal of Botany

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Doñana temporary ponds (southwest Spain) form a system of water bodies of remarkable ecological singularity with a high protection status. However, its species composition, diversity, and distribution of algal communities are largely unknown. During a biological survey carried out in shallow temporary ponds in 2010, several unknown diatom taxa were found in various population densities in the epiphyton of these systems. Detailed light and scanning electron microscopy observations allowed the description of five of them (Eunotia vozmedianoi, Planothidium lacustre, Halamphora tharsis, G. undulans and Pinnularia acidophila var. baetica) as taxa new to science. Differential diagnostic criteria with respect to similar taxa, together with ecological and biogeographical implications of these findings, are briefly discussed. Our results support recent studies indicating that endemism in diatoms might be a widespread pattern.

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“…According to the CCAs, the water renewal rate was the predominant factor that explained the temporal variations in the composition of the algal communities in Chisacá, La Regadera and San Rafael. In additional to seasonal variation, systems with complex hydrological dynamics tended to exhibit frequent species replacement and colonisation episodes (Reyes et al, 2008). Hydrologic fluctuations and temporal variations in phosphorus levels in Chisacá and La Regadera provoked important changes in the secondary species in the system, whereas in San Rafael, the changes were related to the transition from a relatively short period of low thermal stability to a prolonged stratified period and, subsequently, to a final period of physical instability.…”

Section: Discussionmentioning

confidence: 99%

Factors controlling phytoplankton in tropical high-mountain drinking-water reservoirs

López¹,

Rondón²,

Zapata³

et al. 2012

Limnetica

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Factors controlling phytoplankton in tropical high-mountain drinking-water reservoirsHydraulic dynamics is one of the primary factors determining the structural and temporal changes in phytoplankton communities in reservoirs. There is little information on the factors that explain the temporal changes in biotic communities in the high-mountain reservoirs that provide water to the city of Bogotá (Colombia). Our objective was to identify the environmental factors controlling the biomass and composition of algal communities in four tropical high-mountain reservoirs. We hypothesised that hydraulic dynamics is the major determining factor in temporal changes in phytoplankton communities in tropical mountain reservoirs regardless of the nutrient concentration in the system. We studied the temporal changes in phytoplankton over five years in four reservoirs that exhibit different nutrient concentrations and hydraulic management regimes. The phytoplankton in all of the reservoirs were characterised by the dominance of Dinophyceae. Canonical correspondence analyses and Pearson's correlations showed that the water renewal rate primarily explains the phytoplankton composition, followed by total nitrogen, total phosphorous and silicates. The effect of the water renewal rate was different depending on the particular conditions in each system; thus, in reservoirs with greater hydraulic dynamics, the water renewal rate explained the selection of secondary species and dominant species adapted to a broad range of environmental conditions. In the reservoir with a higher physical stability, eventual changes in the water renewal rate shifted the dominant species, reduced diversity and altered phytoplankton succession. In the reservoir with the largest volume and lowest nutrient concentration, phytoplankton species were selected primarily based on chemical and physical variables related to climatic seasonality. Our results suggest that the model for hydraulic management of the reservoirs plays an important role: in highly dynamic reservoirs, there is a direct causal relationship between phytoplankton and physical variables such as stability and water renewal rate; in less dynamic environments, phytoplankton species growth responds primarily to water chemistry.

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Hydrological complexity supports high phytoplankton richness in the Doñana marshland (SW Spain)

Abstract: Two hundred and twenty-four phytoplanktonic taxa were recorded in a riverine floodplain on the

Cited by 11 publications

References 23 publications

Fine-scale responses of phytoplankton to freshwater influx in a tropical monsoonal estuary following the onset of southwest monsoon

Fine-scale responses of phytoplankton to freshwater influx in a tropical monsoonal estuary following the onset of southwest monsoon

The diatom flora in temporary ponds of Doñana National Park (southwest Spain): five new taxa

Factors controlling phytoplankton in tropical high-mountain drinking-water reservoirs

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