The water chemistry of some shallow lakes in Northern Patagonia and their nitrogen status in comparison with remote lakes in different regions of the globe

Rogora, Michela; Massaferro, Julieta; Marchetto, Aldo; Tartari, Gabriele; Mosello, Rosario

doi:10.4081/jlimnol.2008.75

Cited by 59 publications

(67 citation statements)

References 63 publications

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“…It is reasonable to expect that nitrogen deposition in the high mountain areas of the Julian Alps would be higher than that in Rateče due to: i) precipitation amounts approximately twice as high (Kastelec, 1999), and ii) higher elevation and upwind direction that would change the composition of precipitation and thus could be above the critical threshold and closer to the value that Rogora et al (2006) reported for the Central-Southern Alps (14-16 kg N ha -1 yr -1 ). Furthermore, it seems that nitrogen deposition in the whole southern rim of the European Alps is considerably higher than in some other mountain or remote areas of the world (Rogora et al, 2008), e.g. Northern Patagonia in the Andes, Svalbard islands, the Khumbu-Himal region of the Himalayas and the Serra da Estrela in continental Portugal, where depositions up to 7 kg N ha -1 yr -1 were observed.…”

Section: Atmospheric Nitrogen Deposition and Its Impact On Slovenian mentioning

confidence: 94%

Atmospheric deposition chemistry in a subalpine area of the Julian Alps, North-West Slovenia

Muri¹

2013

J Limnol

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Section: Atmospheric Nitrogen Deposition and Its Impact On Slovenian mentioning

confidence: 94%

Atmospheric deposition chemistry in a subalpine area of the Julian Alps, North-West Slovenia

Muri¹

2013

J Limnol

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“…Much of this effect of altitude on species distributions has been attributed to the indirect effects that altitude has via its influences on other habitat characteristics. For example, in the lakes of Patagonia (southern South America), Rogora et al (2008) demonstrated negative correlations between conductivity and altitude between 679 and 1466 m a.s.l., suggesting lower conductivities (referring to low salinity) in waters are coupled with increasing altitude. Consistent with this rationale, Reeves et al (2007) found that altitude affected water depth, water chemistry, temperature and conductivity, and that as a result groundwater ostracods were restricted to midaltitude locations in the Pilbara region of northwestern Australia.…”

Section: Discussionmentioning

confidence: 99%

Distribution and ecological requirements of ostracods (Crustacea) at high altitudinal ranges in Northeastern Van (Turkey)

Külköylüoğlu

Sari

Akdemi̇r

2012

Ann. Limnol. - Int. J. Lim.

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-To understand ostracod distribution and ecology at high altitudes (1659-2889 m a.s.l.), 78 different aquatic sites located in the city of Van were sampled during summer of 2009. A total of 29 ostracod species were recorded in 57 sites. Among the species, Trajancypris laevis (G.W. Mu¨ller 1900), is a new report for the Turkish ostracod fauna. First axis of Canonical Correspondence Analysis (CCA) explained about 68% of the relationships between the 13 most abundant species and environmental variables. Four variables (redox potential, habitat type, pH and electrical conductivity) had the greatest effect on species composition (P < 0.01). Twenty-six species encountered from 38 stations were restricted between 1659 and 1750 m a.s.l. Above 1750 m a.s.l., the numbers of species were not significantly affected by altitude (P > 0.05). Three species (Heterocypris incongruens (Ramdohr, 1808), Ilyocypris bradyi Sars, 1890 and Potamocypris villosa (Jurine, 1820)) occurred extensively from 1650 to 2350 m a.s.l. Spearman rank correlation revealed a negative relationship between Limnocythere inopinata (Baird, 1843) and altitude (r = x 0.894, P = 0.05), while two species (I. bradyi and Prionocypris zenkeri (Chyzer and Toth, 1858)) had a positive correlation to dissolved oxygen (P = 0.05). There was a significantly negative relationship between Ilyocypris inermis Kaufmann, 1900 and electrical conductivity, and H. incongruens showed a significant correlation to station type. Five groups of species were determined by UPGMA analysis. Species in each cluster were grouped according to ecological conditions suitable for them. Results revealed that species ecological tolerances and optimum levels can be species-specific but species with cosmopolitan distributions tend to have high tolerance ranges to different variables, including altitudinal changes.

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“…Like rivers, the biological communities of alpine lakes can act as sensitive indicators of 5 climate change, as even small perturbations of their natural equilibrium may cause detectable 6 responses (Rogora et al, 2008). Hence, the identification of indicator taxa for monitoring 7 glacier retreat in lake environments is feasible.…”

Section: Introductionmentioning

confidence: 99%

The use of invertebrates as indicators of environmental change in alpine rivers and lakes

Khamis

Hannah

Brown

et al. 2014

Science of The Total Environment

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1In alpine regions climatic change will alter the balance between water sources (rainfall, ice-2 melt, snowmelt, and groundwater) for aquatic systems, particularly modifying the relative 3 contributions of meltwater, groundwater and rain to both rivers and lakes. Whilst these 4 changes are expected to have implications for alpine aquatic ecosystems, little is known about 5 potential ecological tipping points and associated indicator taxa. Within the EU-FP7 6 ACQWA project we examined changes in biotic communities along a gradient of glacier 7 influence for two study systems; (1) a stream network in the French Pyrénées and (2) a 8 network of lakes in the Italian Alps, with the aim of identifying potential indicator taxa 9 (macroinvertebrates and zooplankton) of glacier retreat in these environments. To assess 10 parallels in biotic responses across streams and lakes, both primary data and findings from 11 other publications were synthesized. Using TITAN (Threshold Indicator Taxa ANalysis) 12 threshold changes in community composition of river taxa were identified at <5.1% glacier 13 cover and <66.6% meltwater contribution. Below this point the loss of cold stenothermic 14 benthic invertebrate taxa, Diamesa spp. and the Pyrenean endemic Rhyacophila angelieri was 15 apparent. Some generalist taxa including Protonemura sp., Perla grandis, Baetis alpinus, 16Rhithrogena loyolaea and Microspectra sp. increased when glacier cover was < 2.7 % and < 17 52 % meltwater. Patterns were not as distinct for the alpine lakes, due to fewer sampling 18 sites; however, Daphnia longispina grp. and the benthic invertebrate groups Plectopera and 19Planaria were identified as potential indictors. While further work is required to assess 20 potential indicator taxa for alpine lake systems findings from alpine river systems were 21 consistent between methods for assessing glacier influence (meltwater contribution/glacier 22 cover). Hence, it is clear that this approach (TITAN) could become a useful a management 23 tool, enabling: (i) the identification of taxa particularly sensitive to glacier retreat; and (ii) 24 conservation efforts/resources to be better directed in alpine aquatic systems. 25

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The water chemistry of some shallow lakes in Northern Patagonia and their nitrogen status in comparison with remote lakes in different regions of the globe

Abstract: ABSTRACT

Cited by 59 publications

References 63 publications

Atmospheric deposition chemistry in a subalpine area of the Julian Alps, North-West Slovenia

Atmospheric deposition chemistry in a subalpine area of the Julian Alps, North-West Slovenia

Distribution and ecological requirements of ostracods (Crustacea) at high altitudinal ranges in Northeastern Van (Turkey)

The use of invertebrates as indicators of environmental change in alpine rivers and lakes

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