Physico‐chemical factors that determine the distribution of mayflies and stoneflies in a high‐mountain stream in Southern Europe (Sierra Nevada, Southern Spain)

At present, there is a lack of detailed understanding on how the factors converging on water variables from mountain areas modify the quantity and quality of their watercourses, which are features determining these areas’ hydrological contribution to downstream regions. In order to remedy this situation to some extent, we studied the water-bodies of the western sector of the Sierra Nevada massif (Spain). Since thaw is a necessary but not sufficient contributor to the formation of these fragile water-bodies, we carried out field visits to identify their number, size and spatial distribution as well as their different modelling processes. The best-defined water-bodies were the result of glacial processes, such as overdeepening and moraine dams. These water-bodies are the highest in the massif (2918 m mean altitude), the largest and the deepest, making up 72% of the total. Another group is formed by hillside instability phenomena, which are very dynamic and are related to a variety of processes. The resulting water-bodies are irregular and located at lower altitudes (2842 m mean altitude), representing 25% of the total. The third group is the smallest (3%), with one subgroup formed by anthropic causes and another formed from unknown origin. It has recently been found that the Mediterranean and Atlantic watersheds of this massif are somewhat paradoxical in behaviour, since, despite its higher xericity, the Mediterranean watershed generally has higher water contents than the Atlantic. The overall cause of these discrepancies between watersheds is not connected to their formation processes. However, we found that the classification of water volumes by the manners of formation of their water-bodies is not coherent with the associated green fringes because of the anomalous behaviour of the water-bodies formed by moraine dams. This discrepancy is largely due to the passive role of the water retained in this type of water-body as it depends on the characteristics of its hollows. The water-bodies of Sierra Nevada close to the peak line (2918 m mean altitude) are therefore highly dependent on the glacial processes that created the hollows in which they are located. Slope instability created water-bodies mainly located at lower altitudes (2842 m mean altitude), representing tectonic weak zones or accumulation of debris, which are influenced by intense slope dynamics. These water-bodies are therefore more fragile, and their existence is probably more short-lived than that of bodies created under glacial conditions.

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Effect of physico-chemical factors and semi-synthetic media on vegetative growth of Lentinus subnudus (Berk.), an edible mushroom from Nigeria

Food Chemistry ◽

10.1016/j.foodchem.2005.08.052 ◽

2006 ◽

Vol 99 (4) ◽

pp. 742-747 ◽

Cited By ~ 9

Author(s):

J.S. Gbolagade ◽

I.O. Fasidi ◽

E.J. Ajayi ◽

A.A. Sobowale

Keyword(s):

Vegetative Growth ◽

Edible Mushroom ◽

Physico Chemical ◽

Chemical Factors ◽

Synthetic Media

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The Effects of the Geological and Physico-chemical Factors on the Distribution of Marine Plants and Animals in the Mediterranean

Mediterranean Marine Ecosystems ◽

10.1007/978-1-4899-2248-9_9 ◽

1985 ◽

pp. 195-212 ◽

Cited By ~ 7

Author(s):

Mihai Băcescu

Keyword(s):

Marine Plants ◽

Physico Chemical ◽

Chemical Factors ◽

The Mediterranean

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Diurnal vertical migration of some cladocerans in relation to the physico-chemical factors in a fish pond

Dhaka University Journal of Biological Sciences ◽

10.3329/dujbs.v20i2.8975 ◽

1970 ◽

Vol 20 (2) ◽

pp. 147-154 ◽

Cited By ~ 2

Author(s):

AS Bhuiyan ◽

S Akhter ◽

MMA Quddus

Keyword(s):

Key Words ◽

Vertical Migration ◽

Fish Pond ◽

Chemical Parameters ◽

Surface Layers ◽

Diurnal Vertical Migration ◽

Physico Chemical ◽

Chemical Factors ◽

Diurnal Movement ◽

The Relationship

Diurnal vertical migration of four genera of cladocerans, namely Diaphanosoma sp., Daphnia sp., Moina sp. and Bosmina sp., during March to December, 2007 showed that the number of Diaphanosoma sp. was 501 units/1 in the surface layers, 172 units/l in the middle layers and 190 units/l in the bottom layers. The yearly number of Daphnia sp. in surface, middle and bottom layerss was 362 units/l, 46 units/l and 189 units/l respectively. In surface, bottom and middle layers, the number of Moina sp. was 159, 71 and 32 units/l, respectively. Bosmina sp. was 78 units/l in surface, 31 units/l in the middle and 33 units/l in the bottom layers. The number of Diaphanosoma sp., Daphnia sp., Moina sp., Bosmina sp., were 455, 149, 259 and 358 units/l, respectively in the morning, 63, 176, 142, 43 units/l at noon and 107, 55, 28, 59 units/l, respectively in the evening. Throughout the study period the cladocerans were always abundant near the surface during morning and evening. Among the factors responsible for the diurnal movement of cadoceran, light played the most important factor. The relationship between the physico-chemical factors and the cladoceran occurrence in the pond was also explored. Key words: Cladocera; Diurnal migration; Physico-chemical parameters; Fish pond DOI: http://dx.doi.org/10.3329/dujbs.v20i2.8975 DUJBS 2011; 20(2): 147-154

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