El fitoplancton de Lagunas de Ruidera (Parque Natural, Ciudad Real, España)

Bort, Sara; Rojo, Carmen; Rodrigo, María A.; Maidana, Nora I.

doi:10.23818/limn.24.04

Cited by 8 publications

References 24 publications

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Barcoding rotifer biodiversity in Mediterranean ponds using diapausing egg banks

Moreno

Conde‐Porcuna

Gómez

2017

Ecology and Evolution

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The biodiversity of Mediterranean freshwater bodies is among the most threatened worldwide; therefore, its accurate estimation is an urgent issue. However, traditional methods are likely to underestimate freshwater zooplankton biodiversity due to its high species seasonality and cryptic diversity. We test the value of applying DNA barcoding to diapausing egg banks, in combination with the creation of a reference collection of DNA barcodes using adult individual samples, to characterize rotifer communities. We use monogonont rotifers from two lakes in Doñana National Park and one from Ruidera Natural Park in Spain as models to create a reference collection of DNA barcodes for taxonomically diagnosed adult individuals sampled from the water column, to compare with the sequences obtained from individual eggs from the diapausing egg banks. We apply two different approaches to carry out DNA taxonomy analyses, the generalized mixed Yule coalescent method (GMYC) and the Automatic Barcode Gap Discovery (ABGD), to the obtained sequences and to publicly available rotifer sequences. We obtained a total of 210 new rotifer COI sequences from all three locations (151 diapausing eggs and 59 adults). Both GMYC and ABGD generated the same 35 operational taxonomic units (OTUs), revealing four potential cryptic species. Most sequences obtained from diapausing eggs (85%) clustered with sequences obtained from morphologically diagnosed adults. Our approach, based on a single sediment sample, retrieved estimates of rotifer biodiversity higher than or similar to those of previous studies based on a number of seasonal samples. This study shows that DNA barcoding of diapausing egg banks is an effective aid to characterize rotifer diversity in Mediterranean freshwater bodies.

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Barcoding rotifer biodiversity in Mediterranean ponds using diapausing egg banks

Moreno

Conde‐Porcuna

Gómez

2017

Ecology and Evolution

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Why are there so many kinds of planktonic consumers? The answer lies in the allometric diet breadth

Rojo

Salazar

2010

Fifty Years After the ‘‘Homage to Santa Rosalia’’: Old and New Paradigms on Biodiversity in Aquatic Ecosystems

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Why are there so many kinds of planktonic consumers? The answer lies in the allometric diet breadth

Rojo

Salazar

2010

Hydrobiologia

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In an attempt to explain 'Why are there so many kinds of animals?' G.E. Hutchinson highlighted the food web context to suggest that diversity of primary producers should allow consumer richness to be maintained as a result of their adaptive foraging. Co-existence of consumers is then made possible when species differ in body size and thus only a minor diet overlap occurs. All these ideas are still major topics in ecological research and some have been re-examined in order to provide mechanistic explanations of species richness versus connectance relationships in food web structure. The effect of body size as a determinant of diet, jointly with the assumption that individuals are adapted to switch their diet in order to maximise energy gain, have been combined in recent years to develop the Allometric Diet Breadth Model (ADBM). This model, successful for plankton communities, enables us to determine the specific resource-consumer links and then evaluate the diet breadth and test whether the diet overlaps. Here, we apply the ADBM to infer the feeding linkages within a freshwater planktonic community of a Spanish oligo-mesotrophic lake and three spatial partitions of it. ADBM treats phytoplankton species and bacteria as resources and each consumer species (ciliates, rotifers and crustaceans) as both consumers and resources. We applied ADBM to water-column integrated-and single-layered plankton communities to test the importance of the diet on structuring the plankton. If a given pair of species that co-occur in the whole vertical community overlap their diet more than when they occur in the three layers separately, this means that they will never coexist and are hence overdispersed (segregated). Not all species pairs that have a weak diet overlap when belonging to the whole water-column community coexist in water-layered communities. Hence, the richer, whole water-column community would then have lower diet overlap than spatially segregated communities. Therefore, the hypothesis of diet breadth of Hutchinson (The American Naturalist 93: 145-159, 1959) explains community structure throughout the water column, and its deviations may be forced abiotically.

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El fitoplancton de Lagunas de Ruidera (Parque Natural, Ciudad Real, España)

Cited by 8 publications

References 24 publications

Barcoding rotifer biodiversity in Mediterranean ponds using diapausing egg banks

Barcoding rotifer biodiversity in Mediterranean ponds using diapausing egg banks

Why are there so many kinds of planktonic consumers? The answer lies in the allometric diet breadth

Why are there so many kinds of planktonic consumers? The answer lies in the allometric diet breadth

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