scholarly journals Inland water microcrustacean assemblages in an altitudinal gradient in Aysen region (46° S, Patagonia Chile)

2014 ◽  
Vol 74 (1) ◽  
pp. 8-15 ◽  
Author(s):  
Patricio De los Ríos-Escalante ◽  
Esteban Quinán ◽  
Patricio Acevedo
Keyword(s):  
National Park ◽  
Altitudinal Gradient ◽  
Null Model ◽  
Tierra Del Fuego ◽  
Species Number ◽  
Regional Studies ◽  
Inland Water ◽  
Chilean Patagonia ◽  
Water Ecosystems ◽  
Torres Del Paine

The Chilean Patagonia has numerous kinds of inland water ecosystems such as lakes, ponds, wetlands and rivers that have been poorly studied due to access difficulties. This study was carried out in Aysen region, in southern Chile, and it included different kinds of water bodies such as rivers, streams, ponds, lagoons and lakes distributed along an altitudinal gradient at 46° S. It was found a low species number, essentially cladocerans, copepods and amphipods. A null model was applied in order to determine the existence of regulator factors of species associations, and the results revealed that they are not random. The patterns would be influenced by geographical and limnological characteristics of the studied sites. Our results would agree with regional studies on habitat heterogeneity such as in Torres del Paine National Park and other zones in Tierra del Fuego island.

scholarly journals Species co-occurrences based on a presence/absence null model for Copepoda and cladocerans in Patagonia and Tierra del Fuego lakes and ponds

Biologia ◽  
2010 ◽  
Vol 65 (6) ◽  
Author(s):  
Patricio Ríos ◽  
Andrés Mancilla ◽  
Marcela Vega
Keyword(s):  
Saline Lake ◽  
Null Model ◽  
Study Data ◽  
Tierra Del Fuego ◽  
Species Number ◽  
Random Pattern ◽  
Ecological Features ◽  
Chilean Patagonia ◽  
Halophilic Species ◽  
Artemia Persimilis

AbstractThe zooplankton assemblages in southern Chilean Patagonia are characterized by calanoid dominance and low species number that is observable under oligotrophic status and wide conductivity values, whereas at mesotrophic status the daphnids are dominant with high species number, and finally at hyper-saline environments halophilic species such as Artemia persimilis and/or the calanoid Boeckella poopensis predominate. In the present study data of different lakes and ponds between 45-53° S were analyzed, with the aim to determine potential structures at different sites. For this purpose a null model based in guild structure was applied, considering each guild a different kind of water body (lake, small lake, permanent pond, ephemeral pond, and saline lake). The results revealed in two simulations that guild are structured. These results are similar with other descriptions on the basis of null models that revealed a random pattern of species associations for similar ecosystems due to many species repeated in all or practically all studied sites or similarities of ecological features. Ecological and biogeographical topics were discussed.

scholarly journals Macrophytes assemblages in mountain lakes of Alerce Andino National Park (41° S, Lakes Region, Chile).

2016 ◽  
Vol 4 (3) ◽  
Author(s):  
Enrique Hauenstein ◽  
Mario Romero-Mieres ◽  
Patricio Acevedo
Keyword(s):  
Introduced Species ◽  
National Park ◽  
Null Model ◽  
Mountain Lakes ◽  
Jaccard Index ◽  
The Other ◽  
Species Number ◽  
Regulatory Factors ◽  
Riparian Species ◽  
Study Sites

The lakes studied (Chapo, Sargazo, Chaiquenes and Triángulo) are located in the Alerce Andino National Park (41°30'S, 71°32'W), Chile. An inventory of the aquatic and riparian species was performed between December 2010 and January 2011. A null model analysis was done to determine the existence of regulatory factors of species associations, and the Jaccard index was applied to determine floristic similarities. It identidied 23 species, the high number was reported (14) and the most introduced species number (4) were reported at Sargazo lake, whereas the low species number was observed in Triángulo lake with three species. The analysis of the null model revealed the presence of regulatory factors in one of the three simulations. However, in the other two simulations, the species associations appeared to be random, presumably because many species were repeated at the study sites. According to the Jaccard index, Triángulo Lake is noticeably different from the other lakes, probably due to its marked oligotrophy.

scholarly journals Microcrustacean assemblages composition and environmental variables in lakes and ponds of the Andean region - South of Chile (37-39° S)

2011 ◽  
Vol 71 (2) ◽  
pp. 353-358 ◽  
Author(s):  
P. De los Ríos-Escalante ◽  
E. Hauenstein ◽  
M. Romero-Mieres
Keyword(s):  
Random Process ◽  
Chlorophyll Concentration ◽  
Null Model ◽  
Principal Component ◽  
Model Analysis ◽  
Species Number ◽  
Coastal Zones ◽  
Main Determinant ◽  
Chilean Patagonia ◽  
Main Regulator

The zooplankton assemblages in Chilean Patagonian lakes are characterised mainly by their low biodiversity and high predominance of calanoids copepods, a pattern that has been studied for large and deep lakes between 38-51° S, and shallow ponds at 51° S. The aim of the present study was analyse the zooplankton assemblages in different water bodies located in coastal zones, middle valleys and mountain zones between 37-39° S. For this purpose, the following variables were considered: maximum depth, latitude, altitude, chlorophyll-a and species number, and to these variables, a Principal Component Analysis (PCA) was applied. A co-occurrence null model analysis was also applied for determining the existence of a random process in crustacean species associations. The results denoted low species richness, and different species associations for studied sites, and the null model analysis revealed the absence of a random process as regulator of species associations. Furthermore, a low species/genera ratio was identified, which denotes low productivity of the studied sites. These results were supported by a PCA analysis which denoted that the main determinant factors are chlorophyll concentration and species number that are directly associated. The obtained results are in agreement with descriptions in the literature for species diversity for lakes of Chilean Patagonia that describes oligotrophy as the main regulator of zooplankton assemblages. Other ecological and limnological topics are discussed in the present study.

scholarly journals First Descriptions of Aquatic Arthropods in an Unpolluted Native Forest Relict (Rucamanque, 38° S, Araucaria Region, Chile)

Zoodiversity ◽  
2021 ◽  
Vol 55 (3) ◽  
pp. 195-200
Author(s):  
P. De los Rios-Escalante ◽  
A. Alejandro Espinosa ◽  
P. Nunez
Keyword(s):  
Protected Area ◽  
Null Model ◽  
Niche Overlap ◽  
Ecological Niches ◽  
Native Forest ◽  
Aquatic Fauna ◽  
Native Forests ◽  
Chilean Patagonia ◽  
Water Ecosystems ◽  
First Descriptions

The Araucania region (38° S, Chile) originally had native perennial forest in middle valleys regions, that was gradually replaced by towns and agricultural zones during the last century, nevertheless there is some relicts of these native forests that are preserved, one of these relicts is Rucamanque, a protected area in the surrounding of Temuco town. The aim of the present study was a first aquatic Arthropoda description in a stream of this protected area using species co-occurrence and niche overlap null models. The results of species co-occurrence null model revealed that species associations are random, whereas the results of niche sharing revealed that species reported have different ecological niches, and in consequence there is not interspecifi c competence. The exposed results revealed the presence of aquatic fauna representative for unpolluted streams; similar descriptions were found for other similar inland water ecosystems in Argentinean and Chilean Patagonia.

scholarly journals Influence of trophic status and conductivity on zooplankton composition in lakes and ponds of Torres del Paine National Park (Chile)

Biologia ◽  
2006 ◽  
Vol 61 (5) ◽  
Author(s):  
Doris Soto ◽  
Patricio Rios
Keyword(s):  
Body Size ◽  
National Park ◽  
Trophic Status ◽  
Small Body ◽  
Large Body ◽  
Fish Populations ◽  
Zooplankton Species ◽  
Calanoid Copepods ◽  
Chilean Patagonia ◽  
Torres Del Paine

AbstractThe Torres del Paine National Park is located in the southern Chilean Patagonia. This park has numerous and heterogeneous lakes and ponds with different trophic status and zooplankton composition. The aim of this study was to analyze the influence of trophic status and conductivity on zooplankton assemblages in lakes and ponds within the Torres del Paine National Park. The water bodies described in the present study were previously classified in three groups. The first group consisted of large, deep and oligotrophic lakes with fish populations, low zooplankton species diversity and high predominance of calanoid copepods of small body size. The second group contained small mesotrophic lakes with fish populations and relatively high predominance of small sized daphnids. The third group consisted of fishless ponds of different trophic status, wide conductivity gradient and with zooplankton species of relatively large body size. The results show that Daphnids abundance was directly related to chlorophyll-a concentration and inversely associated with conductivity. Calanoids abundance was also directly associated with conductivity.

A null model to study community structure of microcrustacean assemblages in north Patagonian urban wetlands (39-41°S, Chile)

Crustaceana ◽  
2014 ◽  
Vol 87 (11-12) ◽  
pp. 1377-1385
Author(s):  
Patricio De los Ríos-Escalante ◽  
Andrés Muñoz-Pedreros ◽  
Patricia Möller
Keyword(s):  
Community Structure ◽  
Trophic Status ◽  
Null Model ◽  
Model Analysis ◽  
Jaccard Index ◽  
Field Observations ◽  
Urban Wetlands ◽  
Community Similarity ◽  
Chilean Patagonia ◽  
Inland Water Bodies

The inland water bodies of northern Chilean Patagonia (38-41°S) have many lakes, wetlands and ponds with different littoral and zooplanktonic crustacean assemblages. This study presents field observations of species associations sampled from shallow wetlands located in the urban zones of Valdivia (39°S) and Puerto Montt (41°S). A species presence-absence matrix was created for calculating the Jaccard Index of community similarity and for testing null models of species associations, with the aim of determining whether species associations are random or not. The results of the Jaccard Index calculations indicated the existence of non-defined groups. The results of the null model analysis denoted the presence of regulating factors for Valdivia wetlands, whereas for Puerto Montt wetlands no such factors could be demonstrated. The outcomes of both the Jaccard Index and the significant null model analysis agree with previous ecological descriptions of changes in trophic status as a consequence of changes in the surrounding basin as a determinant of species associations. The ecology of these communities is also discussed.

Regimul nutrienților în zona Parcului National Orhei

2020 ◽  
Author(s):  
Dumitru Drumea ◽  
◽  
Svetlana Debelaia-Buracinschi ◽  
Keyword(s):  
Wetland Restoration ◽  
National Park ◽  
The State ◽  
State Of Water ◽  
Functional Zones ◽  
Key Issues ◽  
Water Ecosystems

Nutrogen and phopsphorus present one of the key issues in the management of the territory of the National Park Orhei. Mentioned territory can be used as a refference one for the identification of the impacts of nutrients originated from different functional zones on the state of water ecosystems. Wetland restoration activities are recognised as a key ones for the maintenance of nutrient balaces in the region and main catacteristics of the components of environment in the area of the national park are presented.

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