Crustacean zooplankton communities, mixotrophic cililates, and optical properties in North Patagonian lakes, investigated by remote sensing

Crustaceana ◽  
2020 ◽  
Vol 93 (9-10) ◽  
pp. 1065-1078
Author(s):  
Patricio De los Ríos-Escalante ◽  
Stefan Woelfl ◽  
Patricio Acevedo ◽  
Manuel Castro
Keyword(s):  
Remote Sensing ◽  
Principal Component ◽  
Null Models ◽  
Crustacean Zooplankton ◽  
Species Number ◽  
Patagonian Lakes ◽  
Opposite Situation ◽  
Remote Sensing Techniques ◽  
Zooplankton Communities ◽  
Mixotrophic Ciliates

Abstract North Patagonian lakes are characterized by their oligotrophic or oligo-mesotrophic status. These conditions bring with them, respectively, the presence of abundant mixotrophic ciliates and a low species number of crustacean zooplankton under oligotrophic status, and low numbers of mixotrophic ciliates and a high species number of zooplankton under oligo-mesotrophic status. The aims of the present study are, (1) to use remote sensing techniques for determining abundances of mixotrophic ciliates and crustacean zooplankton, and (2) to characterize these mixotrophic and zooplankton communities by using null models. The sensing was accomplished from a satellite, i.e., by measuring the reflectance of the sunlight on a waterbody, which result will vary according to the contents of the water column. The results of Principal Component Analysis (PCA) revealed that sites with low reflectance of all bands have a high abundance of Stentor accompanied by low zooplankton absolute abundance, whereas a markedly opposite situation was observed under high reflectance, where Stentor has low abundance in conjunction with high zooplankton absolute abundances. The null models revealed that the communities in the studied sites do not have structured species associations, and that there is an overlap of niches. These results obtained agree with similar observations for Argentinean Patagonian lakes.

scholarly journals Use of Null Models to Explain Crustacean Zooplankton Assemblages in Northern Patagonian Lakes (Chile) with and Without Mixotrophic Ciliates

Crustaceana ◽  
2011 ◽  
Vol 84 (9) ◽  
pp. 1061-1068 ◽  
Author(s):  
Patricio De Los Ríos-Escalante ◽  
Stefan Woelfl
Keyword(s):  
Null Model ◽  
Field Work ◽  
Study Data ◽  
Null Models ◽  
Crustacean Zooplankton ◽  
Species Number ◽  
Calanoid Copepods ◽  
Patagonian Lakes ◽  
Study Sites ◽  
Mixotrophic Ciliates

AbstractThe zooplankton assemblages in deep, mostly oligotrophic northern Patagonian lakes are characterized by a low species number and a marked dominance of calanoid copepods, as well as often by the presence of large mixotrophic ciliates (Stentor). In the present study, data collected in field work on four northern Patagonian lakes were analysed using co-occurrence of null models, with the aim to determine potential regulating factors for the observed crustacean and mixotrophic ciliate assemblages, using a presence-absence matrix. The null model uses species co-occurrence, and the basis of this model is that the species associations observed are random. The results revealed the absence of regulating factors and indicate that the sites are relatively homogeneous, with low species numbers, and similar plankton assemblages at all study sites. This finding coincides with similar descriptions for zooplankton assemblages in other Chilean Patagonian lakes.

Use of null models to explain crustacean zooplankton assemblages in North Patagonian lakes with presence or absence of mixotrophic ciliates (38°S, Chile)

Crustaceana ◽  
2017 ◽  
Vol 90 (3) ◽  
pp. 311-319 ◽  
Author(s):  
Patricio De los Ríos-Escalante ◽  
Stefan Woelfl
Keyword(s):  
Species Richness ◽  
Random Effect ◽  
Null Model ◽  
Model Analysis ◽  
Null Models ◽  
Crustacean Zooplankton ◽  
Calanoid Copepods ◽  
The Third ◽  
Patagonian Lakes ◽  
Mixotrophic Ciliates

Zooplankton assemblages in Northern Patagonian lakes are characterized by a low species richness and a marked dominance of calanoid copepods. The aim of the present study was to do a null model analysis to explain the composition of the zooplankton assemblages in two North Patagonian lakes. The first aspect to which null model analysis was applied was species co-occurrence, and there the model indicates that the species associations found are not random. The second aspect was niche sharing, and that analysis denotes that the species do not share niches. The third aspect tested was size overlap, and the model there denotes that the species have no size overlap. The results obtained indicate that the sites are relatively homogeneous, which would explain the random effect in species co-ocurrence, whereas the absence of niche sharing is due to the presence of different energetic resources at both sites investigated, which would separate the niche of each species from those of other faunistic elements. Finally, the third application of the null model analysis demonstrates that there is no competition among the species reported upon herein.

scholarly journals Crustacean zooplankton communities in Chiloé Island coastal lakes (42°S, Chile)

Crustaceana ◽  
2018 ◽  
Vol 91 (2) ◽  
pp. 213-223 ◽  
Author(s):  
Patricio R. De los Ríos Escalante ◽  
Fatima Kies
Keyword(s):  
Species Richness ◽  
Null Model ◽  
Crustacean Zooplankton ◽  
Species Number ◽  
Mineral Concentration ◽  
Crustacean Species ◽  
Organic Carbon Concentration ◽  
Nitrogen Concentrations ◽  
Potential Factors ◽  
Zooplankton Communities

The lakes of Chiloé Island have a high dissolved organic carbon concentration (known as “humic”) and show a connection with brackish water. They also display a high species richness of crustacean zooplankton. The aim of the present study is to characterize the potential factors that explain crustacean species richness in Chiloé Island lakes. To that purpose parameters of the abiotic environment were determined. The results of PCA performed on those data revealed the existence of three lakes with high crustacean species richness that are relatively deep, show high nitrogen concentrations, and are located at relatively high altitude. In contrast, there are two lakes with low species richness, high mineral concentration, and situated at low altitude. One of these lowland lakes gives rise to a river effluent to the sea, and it is connected to the other lake; these observations agree with the results of a performed cluster analysis. Nevertheless, the co-occurrence null model analysis revealed the absence of regulator patterns in species associations, which could be explained to the fact that many of the species occur in most of the lakes. These results are markedly different in comparison to Patagonian lakes of Argentina and Chile that have a low crustacean species number.

scholarly journals Analysis of cloud condition on Sentinel-2 MSI and Landsat-8 OLI images of a public supply lake in Belém-Pará-Brazil

2019 ◽  
Vol 14 (4) ◽  
pp. 1 ◽  
Author(s):  
Vítor Abner Borges Dutra ◽  
Paulo Amador Tavares ◽  
Hebe Morganne Campos Ribeiro
Keyword(s):  
Remote Sensing ◽  
Principal Component ◽  
Economic Losses ◽  
Landsat 8 ◽  
Sensing Applications ◽  
Dissolved Organic Matters ◽  
Combined Use ◽  
Cloud Regime ◽  
Remote Sensing Techniques ◽  
Sentinel 2

The eutrophication process leads to reduced water quality and economic losses worldwide. Furthermore, it is possible to apply remote sensing techniques for monitoring of aquatic environments. In this paper, we analysed the combined use of Sentinel-2 Multispectral Instrument and Landsat-8 Operational Land Imager data to monitor a eutrophic aquatic environment under adverse cloudy conditions, from July 2016 to July 2018. Data pre-selection was performed, and then the images were acquired for further investigation. After that, we created a key to the interpretation of cloud conditions for the study area and grouped each of 125 scenes in a Principal Component Analysis (PCA). The PCA grouped months with similarities in cloud conditions, highlighting their patterns in terms of the rainy and dry seasons for the study area. Another interesting result was that, even under the inherent adverse cloud regime of the Amazon, the combined use of both free satellite imagery data could be useful for further analyses, such as measuring of chlorophyll a, coloured dissolved organic matters, total suspended solids and turbidity. However, we highlight that, firstly, studies must be made to validate the data in situ, so that monitoring programs can be built through remote sensing applications.

Null models for explaining inland water crustacean zooplankton communities in Chile

2018 ◽  
Vol 68 (2) ◽  
pp. 161-172
Author(s):  
Patricio De los Ríos ◽  
Guillermo Figueroa-Muñoz ◽  
Luciano Parra-Coloma
Keyword(s):  
Water Bodies ◽  
Crustacean Zooplankton ◽  
Species Number ◽  
Large Lakes ◽  
Inland Water ◽  
Species Numbers ◽  
Ephemeral Pools ◽  
Argentinean Patagonia ◽  
Southern Patagonia ◽  
Zooplankton Communities

AbstractInland water crustaceans in Chile are characterized by their low species number and marked endemism; this is due to the marked oligotrophy of water bodies and the geographical properties of Chilean territory, which consists of mountains and glaciers. The aim of the present study is to typify the inland water crustaceans in the northern Aysen region (44-46°S), which is branded by the presence of mountains, ice fields and inland seas, with different kinds of water bodies such as large lakes, permanent and ephemeral pools, rivers and streams. The results revealed low species numbers, but the species associations are random, because in many sites the same species frequently reoccur. Nevertheless, there are marked differences in species associations. The present results tend to agree with similar results for the Magallanes region in southern Patagonia and Argentinean Patagonia.

Crustacean zooplankton assemblages in inland waters of southern Patagonia (Alacalufes National Reserve), Chile (49-51°S)

Crustaceana ◽  
2016 ◽  
Vol 89 (14) ◽  
pp. 1639-1647 ◽  
Author(s):  
Patricio De los Ríos Escalante ◽  
Jorge F. Gonzalez ◽  
Konrad Górski ◽  
Evelyn M. Habit ◽  
Daniel E. Ruzzante
Keyword(s):  
Species Abundance ◽  
High Flow ◽  
Crustacean Zooplankton ◽  
Species Number ◽  
Inland Waters ◽  
High Latitudes ◽  
Chilean Patagonia ◽  
Southern Patagonia ◽  
Zooplankton Communities ◽  
Cold Lakes

The inland water crustacean communities in southern Chilean Patagonia (46-55°S) are characterized by their marked low species number, and many recurrent species among a wide ecological and geographical gradient, that is due to oligotrophy of lakes and lagoons and the fluvial parameters (i.e., high flow velocities) in rivers. The aim of the present study was to describe the zooplankton communities in lakes and respective outflow river estuaries in Alacalufes National Reserve on islands of Chilean southern Patagonia (49-51°S). Species abundance and presence/absence were considered. The results obtained revealed the presence of a low number of species and also multiple sites in which zooplankton was not recorded at all. This is probably due the low zooplankton diversity of cold lakes at these high latitudes and the often turbulent flow of the outflow rivers studied.

Experimental evidence for crustacean zooplankton grazing activity on mixotrophic ciliates

2019 ◽  
Vol 69 (2) ◽  
pp. 259-264 ◽  
Author(s):  
Patricio De Los Rios ◽  
Stefan Woelfl ◽  
Cristian Soto
Keyword(s):  
Daphnia Pulex ◽  
Experimental Treatment ◽  
Crustacean Zooplankton ◽  
Species Number ◽  
Zooplankton Species ◽  
Species Numbers ◽  
Primary Consumers ◽  
Experimental Treatments ◽  
Mixotrophic Ciliates

Abstract With their ultraoligotrophic status, the Chilean North Patagonian lakes have mixotrophic ciliates in their pelagic environments as producers, whereas the primary consumers are crustaceans that are low in abundance and species numbers. The aim of the present study was to determine the potential grazer role of mixotrophic ciliates on crustacean zooplankton collected in a lake without mixotrophic ciliates. Three experiments were conducted; one had a control with mixotrophic ciliates and an experimental treatment including the copepod Boeckella gracilipes obtained from Caburgua lake, whereas the second and third experiments had a control without zooplankton, and three treatments with the addition of Daphnia pulex and Mesocyclops araucanus, and a third treatment with equal amounts of both species. The results revealed grazing effects on the mixotrophic ciliates in the experimental treatments. This finding supports the evidence from the field and experiments suggesting that, in the transition from oligotrophy to mesotrophy with consequent changes in zooplankton, species number and abundance of mixotrophic ciliates decrease in their abundance.

Crustacean Zooplankton Communities as Indicators of Limnological Conditions An Approach Using Principal Component Analysis

1977 ◽  
Vol 34 (7) ◽  
pp. 962-975 ◽  
Author(s):  
W. Gary Sprules
Keyword(s):  
Principal Component Analysis ◽  
Zooplankton Community ◽  
Principal Component ◽  
Water Clarity ◽  
Component Analysis ◽  
Crustacean Zooplankton ◽  
Community Patterns ◽  
Zooplankton Community Structure ◽  
The Matrix ◽  
Zooplankton Communities

Principal component analysis is used to develop a technique for predicting the limnological characteristics of a lake from knowledge of its midsummer limnetic crustacean zooplankton community. Patterns of variation in zooplankton community structure are summarized in the principal components extracted, via the species covariance matrix, from the matrix of transformed proportionate numerical abundances of species in a sample of lakes. The relation between these patterns and the limnological characteristics of the lakes is determined from the first-order rank correlations of the limnological variables with the components. In relatively undisturbed lakes of northwestern Ontario, results indicate that lakes characterized by Cyclops bicuspidatus thomasi, Diaptomus minutus, and others are large and clear, whereas those characterized by Tropocyclops prasinus mexicanus, D. oregonensis, and others are smaller and of lower water clarity. These patterns are contrasted with those extracted from the same data using more subjective techniques. In the acid-stressed Killarney region, Ontario, lakes dominated by D. minutus are predicted to be acidic, small, and clear, whereas those dominated by Diaphanosoma leuchtenbergianum, Bosmina longirostris, Mesocyclops edax, and others will be less clear, larger, and with higher pH. In Haliburton lakes, Ontario, those with Diaptomus oregonensis, M. edax, and Ceriodaphnia lacustris are predicted to be small and productive, whereas those with D. minutus, D. sicilis, B. longirostris, and Daphnia dubia will be larger and less productive. The usefulness of the technique and some modifications are discussed. Key words: zooplankton communities, principal component analysis, ELA lakes, Haliburton lakes, Killarney lakes

Observations on crustacean zooplankton in two connected north Patagonian lakes (Calafquén-Pellaifa, 39°S, Chile)

Crustaceana ◽  
2019 ◽  
Vol 92 (6) ◽  
pp. 665-673
Author(s):  
Patricio De los Ríos ◽  
Jorge Farias-Avendaño ◽  
Maria J. Suazo
Keyword(s):  
Species Composition ◽  
Interspecific Competition ◽  
Size Structure ◽  
Zooplankton Community ◽  
Null Models ◽  
Crustacean Zooplankton ◽  
Human Intervention ◽  
Patagonian Lakes ◽  
Biodiversity Index

Abstract The northern Patagonian lakes (38-41°S), are characterized by their location in catchment basins that have been markedly altered through human intervention. In those basins, the original native, perennial forest has been replaced by towns, villages and agricultural zones. The present study was done in two interconnected north Patagonian lakes (the lakes Calafquén and Pellaifa), where the species composition of the crustacean zooplankton community was compared, using a biodiversity index and size-structure null models. The results denoted the presence of marked differences between both sites, Calafquén lake being inhabited by less species and in general showing lower abundances of individuals in comparison to Pellaifa lake. The results of size-structure null models revealed the absence of interspecific competition for both sites. The obtained results would agree with similar observations for other northern Patagonian lakes in Argentina and Chile.

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