Gonad Maturation of Brook Trout (Salvelinus fontinalis) in a High Mountain Lake Under a Modified Photoperiod

1972 ◽  
Vol 29 (8) ◽  
pp. 1209-1211 ◽  
Author(s):  
Gary Lee Larson
Keyword(s):  
Snow Cover ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Early Summer ◽  
Day Length ◽  
Mountain Lake ◽  
Gonad Maturation ◽  
High Mountain ◽  
High Mountain Lake

Gonad maturation of brook trout (Salvelinus fontinalis) in Pratt Lake appeared similar to those reported for other areas although the day-length cycle was greatly modified by snow cover that capped the lake until early summer.

Oxidative stress ecology in brook trout (Salvelinus fontinalis) from a high-mountain lake (Cottian Alps)

2020 ◽  
Vol 715 ◽  
pp. 136946 ◽  
Author(s):  
Paolo Pastorino ◽  
Antonia Concetta Elia ◽  
Barbara Caldaroni ◽  
Vasco Menconi ◽  
Maria Cesarina Abete ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Mountain Lake ◽  
High Mountain ◽  
High Mountain Lake ◽  
Stress Ecology

scholarly journals Assessment of Biological and Sanitary Condition of Alien Fish from a High-Mountain Lake (Cottian Alps)

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 559
Author(s):  
Paolo Pastorino ◽  
Marino Prearo ◽  
Marco Bertoli ◽  
Vasco Menconi ◽  
Giuseppe Esposito ◽  
...  
Keyword(s):  
Brook Trout ◽  
Mountain Lake ◽  
Human Consumption ◽  
High Mountain ◽  
High Mountain Lake ◽  
Sanitary Condition ◽  
Trout Population ◽  
Males And Females ◽  
Alien Fish ◽  
Cadmium And Lead

This study aimed to assess the biological and sanitary conditions of alien fish in a high-mountain lake (Balma Lake) located in the Cottian Alps. A single fish sampling session (August 2018) using gillnets collected 90 specimens of brook trout (Salvelinus fontinalis). Sex and age were determined (59 females and 31 males, age class 0+ to 4+). Regression analysis showed no difference in total weight and total length between males and females (ANCOVA: F = 0.453; p = 0.954). The mean condition factor (Kmean) decreased with increasing age for males and females. Terrestrial insects were the main prey found in the fish stomachs. The parasitological exam was negative, and the bacteriological exam was positive for Carnobacterium maltaromaticum and C. divergens in 33% of specimens. The total mercury, cadmium, and lead concentration in muscle tissue was within the maximum limit established by the European Commission for human consumption. The brook trout population was found to be well structured; these findings may help local administrations in the implementation of eradication measures.

scholarly journals Temporal changes of microbial assemblages in the ice and snow cover of a high mountain lake

1999 ◽  
Vol 44 (4) ◽  
pp. 973-987 ◽  
Author(s):  
Marisol Felip ◽  
Lluís Camarero ◽  
Jordi Catalan
Keyword(s):  
Snow Cover ◽  
Temporal Changes ◽  
Mountain Lake ◽  
High Mountain ◽  
High Mountain Lake

scholarly journals Terms and conditions of high-mountain lake ice-cover chemistry (Carpathians, Poland)

2015 ◽  
Vol 61 (230) ◽  
pp. 1207-1212 ◽  
Author(s):  
Iwona Kurzyca ◽  
Adam Choiński ◽  
Joanna Pociask-Karteczka ◽  
Agnieszka Lawniczak ◽  
Marcin Frankowski
Keyword(s):  
Water Body ◽  
Ice Cover ◽  
Multilayered Structure ◽  
Mountain Lake ◽  
High Mountain ◽  
Lake Ice ◽  
High Mountain Lake ◽  
Spatial Diversification ◽  
The Tatra Mountains

AbstractWe discuss the results of an investigation of the chemical composition of the ice cover on the high-mountain lake Morskie Oko in the Tatra Mountains, Carpathians, Poland. In the years 2007–13, the ice cover was characterized by an average duration of 6 months, a thickness range of 0.40–1.14 m, and a multilayered structure with water or slush inclusion. In water from the melted ice cover, chloride (max. 69%) and sulphate (max. 51%) anions and ammonium (max. 66%) and calcium (max. 78%) cations predominated. Different concentrations of ions (F−, Cl−, NO3−, SO42−, Na+, K+, Mg2+, Ca2+, NH4+) in the upper, middle and bottom layers of ice were observed, along with long-term variability and spatial diversification within the ice layer over the lake. Snowpack lying on the ice and the water body under the ice were also investigated, and the influence on the ice cover of certain ions in elevated concentrations was observed (e.g. Cl− in the upper ice cover and the snowpack, and Ca2+ in the bottom ice cover and water body).

Hagelseewli: a fascinating high mountain lake — suitable for palæoclimate studies?

2000 ◽  
Vol 27 (2) ◽  
pp. 1013-1022 ◽  
Author(s):  
G.-H. Goudsmit ◽  
G. Lemcke ◽  
D. M. Livingstone ◽  
A. F. Lotter ◽  
B. Müller ◽  
...  
Keyword(s):  
Mountain Lake ◽  
High Mountain ◽  
High Mountain Lake

scholarly journals Perspectives for an integrated understanding of tropical and temperate high-mountain lakes

2016 ◽  
Vol 75 (s1) ◽  
Author(s):  
Jordi Catalan ◽  
John C. Donato Rondón
Keyword(s):  
Global Change ◽  
Freshwater Ecosystems ◽  
Mountain Lakes ◽  
Molecular Techniques ◽  
Mountain Lake ◽  
Tropical Lakes ◽  
High Mountain ◽  
Essential Difference ◽  
High Mountain Lakes ◽  
High Mountain Lake

<p>High mountain lakes are extreme freshwater ecosystems and excellent sentinels of current global change. They are likely among the most comparable ecosystems across the world. The largest contrast occurs between lakes in temperate and tropical areas. The main difference arises from the seasonal patterns of heat exchange and the external loadings (carbon, phosphorus, metals). The consequence is a water column structure based on temperature, in temperate lakes, and oxygen, in tropical lakes. This essential difference implies that, in tropical lakes, one can expect a more sustained productivity throughout the year; a higher nutrient internal loading based on the mineralization of external organic matter; higher nitrification-denitrification potential related to the oxyclines; and a higher metal mobilization due to the permanently reduced bottom layer. Quantifying and linking these and other biogeochemical pathways to particular groups of organisms is in the current agenda of high-mountain limnology. The intrinsic difficulties of the taxonomic study of many of the organisms inhabiting these systems can be now overcome with the use of molecular techniques. These techniques will not only provide a much less ambiguous taxonomic knowledge of the microscopic world, but also will unveil new biogeochemical pathways that are difficult to measure chemically and will solve biogeographical puzzles of the distribution of some macroscopic organism, tracing the relationship with other areas. Daily variability and vertical gradients in the tropics are the main factors of phytoplankton species turnover in tropical lakes; whereas seasonality is the main driver in temperate communities. The study of phytoplankton in high-mountain lakes only makes sense in an integrated view of the microscopic ecosystem. A large part of the plankton biomass is in heterotrophic, and mixotrophic organisms and prokaryotes compete for dissolved resources with eukaryotic autotrophs. In fact, high-mountain lake systems are excellent model ecosystems for applying an investigation linking airshed to sediments functional views. Additionally, the study of the mountain lakes districts as functional metacommunity units may reveal key differences in the distribution of organisms of limited (slow) dispersal. We propose that limnological studies at tropical and temperate high mountain lakes should adhere to a common general paradigm. In which biogeochemical processes are framed by the airshed-to-sediment continuum concept and the biogeographical processes in the functional lake district concept. The solid understanding of the fundamental limnological processes will facilitate stronger contributions to the assessment of the impacts of the on-going global change in remote areas.</p>

The phylogenetic placement of Temnogametum (Zygnemataceae) and description of Temnogametum iztacalense sp. nov., from a tropical high mountain lake in Mexico

2020 ◽  
pp. 1-15
Author(s):  
Gloria Garduño-Solórzano ◽  
Martha Martínez-García ◽  
Guilherme Scotta Hentschke ◽  
Graciliana Lopes ◽  
Raquel Castelo Branco ◽  
...  
Keyword(s):  
Mountain Lake ◽  
High Mountain ◽  
High Mountain Lake ◽  
Phylogenetic Placement
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