Phytoplankton from natural water bodies of the Patagonian Plateau

Izaguirre, Irina; Saad, Juan Francisco

doi:10.1127/1612-166x/2014/0065-0048

Cited by 20 publications

(8 citation statements)

References 15 publications

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“…In most of the lakes dealt with in the present paper phytoplankton abundance was dominated by chlorococcalean and volvocalean green algae (Izaguirre & Saad 2014). In general, desmids were relatively less abundant in terms of density, except in La Herradura where a Closterium species was subdominant in the phytoplankton community.…”

Section: Discussionmentioning

confidence: 85%

“…The first one mostly includes deep oligotrophic lakes of glacial origin, whereas the second one hosts different types of water bodies distributed in the arid Patagonian steppe, many of them located on the basaltic plateaux. The main environmental characteristics of these two zones were detailed in previous papers (e.g., Tell et al 2011;Izaguirre & Saad 2014). Due to remoteness of the study sites, lakes located in the Patagonian Plateau have been less investigated than those in the Andean region.…”

Section: Introductionmentioning

confidence: 99%

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Remarkable desmid species from the southern Patagonian highlands

Coesel¹,

Porcel²,

Geest³

et al. 2017

Fottea

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Abstract:Phytoplankton research in a number of shallow lakes in southern Patagonia revealed the occurrence of three noteworthy Cosmarium species. One of them, Cosmarium decussare Brook et Williamson, found only once before in Antarctica, is remarkable for its highly asymmetric cell morphology. The other two species, Cosmarium chapuense and Cosmarium mickeyoides, striking by an unusual cell shape, are described as new to science. Ecological and biogeographical characteristics are discussed.

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Section: Discussionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Remarkable desmid species from the southern Patagonian highlands

Coesel¹,

Porcel²,

Geest³

et al. 2017

Fottea

Self Cite

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show abstract

“…In addition, zooplankton grazing pressure on phytoplankton may be reduced by trout, with increasing nutrient recycling, promoting phytoplankton growth and potentially causing trophic cascades (Carpenter and Kitchell, ; Eby et al , ). A recent study in the Lake Strobel plateau found that stocked lakes have substantially higher levels of Cyanobacteria than fishless lakes (Izaguirre and Saad, ), indicating the occurrence of changes in the phytoplankton communities.…”

Section: Discussionmentioning

confidence: 99%

Rainbow trout effects on zooplankton in the reproductive area of the critically endangered hooded grebe

Lancelotti

Marinone

Roesler

2016

Aquatic Conservation

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ABSTRACT1. Aquaculture in arid Patagonia is potentially affecting the hooded grebe (Podiceps gallardoi), a critically endangered endemic waterbird. Exotic rainbow trout (Oncorhynchus mykiss) were stocked from 1994 in naturally fishless lakes, the primary reproductive habitat of this grebe.2. Trout and grebes are visual predators, whose diets overlap. Consequently, trout could reduce the abundance of prey of the hooded grebe.3. This study compared the size distribution and abundance of the pelagic zooplankton fraction preyed upon by trout in four fishless lakes and three lakes stocked with trout, including vegetated and unvegetated lakes.4. The mean size of Daphnia spp. was 45% and 35% larger in fishless lakes than in stocked lakes, for unvegetated and vegetated lakes, respectively. Boeckella spp. were larger in fishless than in stocked vegetated lakes.5. Fishless and stocked lakes had highly contrasting biomasses of large pelagic crustaceans. Amphipods were absent from the water column of all stocked lakes analysed, and were abundant in fishless lakes. Parabroteas sarsi was absent from the two large unvegetated lakes, stocked with trout.6. These shifts in the abundance and size spectrum of the zooplankton may reflect competition between trout and hooded grebe, affecting the survival of the latter species.7. The current conservation status of this rare aquatic bird demands the application of management tools to reduce the detrimental effects of aquaculture on their primary reproductive habitat.

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“…Basins are fed by snowmelt, with a significant inter‐annual hydrological variability, and also show a wide spectrum of water characteristics, related to the nature of the recipient sediments. Even lakes that are similar in their general configuration characteristics comprise a broad range of colour and salinity, from clear freshwater to brackish lakes (Izaguirre & Saad, ; Lancelotti, Pozzi, Yorio, & Pascual, ). Many lakes, including those larger than 3 km 2 , dry out during years of low precipitation (Lancelotti, Pascual, & Gagliardini, ).…”

Section: Study Areamentioning

confidence: 99%

Climate variability and trends in the reproductive habitat of the critically endangered hooded grebe

Lancelotti

Pessacg

Roesler

et al. 2020

Aquatic Conservation

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The population of the critically endangered hooded grebe (Podiceps gallardoi) has decreased drastically during recent decades. The effects of climate change on their reproductive area (Southern Patagonia) have been proposed as one of the potential causes of their critical situation. However, there is much uncertainty about climate variability and climate trends at local scales in Patagonia, and their effects on the hooded grebe habitat. Variability and trends in temperature, precipitation, and wind from 1960 to 2016 in one of the most important reproductive areas of hooded grebe – the Lake Strobel plateau – were analysed. A Landsat satellite image series (1973–2016) was used to evaluate changes in lake area in the region. Generalized linear models were used to analyse the relationship between the variation in lake area and climatic variables, including the Antarctic Oscillation Mode (AAO) index, which is the most important year to year pattern in climate variability at high latitudes of the Southern Hemisphere. High inter‐annual variability and increasing coefficients of variation in precipitation and wind were found, as well as a significant positive trend in temperature. Total lake area, as well as the area specifically used by hooded grebe to reproduce, decreased significantly over time, with high inter‐annual variability. Variation in lake area was significantly correlated with variation in precipitation, and with the AAO index. The loss of reproductive habitat may force the hooded grebe to use sub‐optimal environments, such as lakes with lower food supply, lower macrophyte cover, and less protection from wind – a potential major handicap for this declining species. Information on lake variation in response to climatic variability could be used to guide hooded grebe conservation strategies, directing more resources and special efforts to those reproductive lakes that are more resilient to the effects of climate fluctuations.

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Phytoplankton from natural water bodies of the Patagonian Plateau

Cited by 20 publications

References 15 publications

Remarkable desmid species from the southern Patagonian highlands

Remarkable desmid species from the southern Patagonian highlands

Rainbow trout effects on zooplankton in the reproductive area of the critically endangered hooded grebe

Climate variability and trends in the reproductive habitat of the critically endangered hooded grebe

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