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21 janvier 2010 4 21 /01 /janvier /2010 18:48




Corot encre




Corot sous bois




corot dessin sous bois




arbres Corot




corot dessin arbres




Corot croquis




autre article sur Corot

" COROT "





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21 janvier 2010 4 21 /01 /janvier /2010 00:30




Japoniaiserie.jpg






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philippe charpentier - dans Natures
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20 janvier 2010 3 20 /01 /janvier /2010 00:25



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19 janvier 2010 2 19 /01 /janvier /2010 08:59




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18 janvier 2010 1 18 /01 /janvier /2010 00:37



daphne.jpg

    
D. pulex is characteristically associated with small ponds, although less pigmented populations of D. pulex may occur in deep, clear lakes, such as Lake Titicaca (Haney, pers comm.).
    Daphnia pulex has a broad range of habitats.  It is the most common Daphnia found in ephemeral pools, but it also occurs in lakes ranging from ultra oligotrophic (clear bodied with little pigmentation) to eutrophic, where they may be bright red because of high hemoglobin production.  Forms of D. pulex in large lakes may be difficult to distinguish from D. pulicaria.
   D. pulex has been widely used in zooplankton feeding studies.  Results indicate great variability between populations from different lakes, such as their ability to resist cyanobacteria toxins (3).
    The presence of Microcystis aeruginosa induced ephippia production in D. pulex in the laboratory (3).   Immature stages of copepods may enter the brood pouch of various Daphnia species, including D. pulex, where they consume the daphnid eggs (3)(4)(5).  Clones of D. pulex with a longer secondary abdominal process are better protected from brood pouch predation by adult Eucyclops agilis, thus protecting their eggs (6).   D. pulex consistently suppressed populations of Brachionus calyciflorusKeratella cochlearis in competition experiments in the lab.  This was due to the superior feeding efficiency of Daphnia.  However, D. pulex also can have direct ”interference competition” effects on K. cochlearis by drawing the rotifer into the filtering chamber in the feeding currents and then rejecting the damaged rotifers (7).  Interestingly, the more agile rotifer Polyarthra, can detect these filtering currents and escape by quick lateral swimming motion (7).1) SCHWARTZ, S. S., D. J. INNES, AND P. D. HEBERT.  1985.  Morphological separation of Daphnia pulex and Daphnia obtusa in North America.  Limnol. Oceanogr.  30: and 189-197.

(2) DODSON, S. I.  1984.  Predation of Heterocope septentrionalis on two species of Daphnia: Morphological defenses and their cost.  Ecology.  65: 1249-1257.

(3) GLIWICZ, Z. M.  1994.  Retarded growth of cladoceran zooplankton in the presence of copepod predation.  Oecologia.  97: 458-461.

(4) GLIWICZ, Z. M. AND H. STIBOR.  1993.  Egg predation by copepods in Daphnia brood cavities.  Oecologia.  95: 295-298.

(5) GLIWICZ, Z. M., AND W. LAMPERT.  1994.  Clutch-size variability in Daphnia: Body-size related effects of egg predation by cyclopoid copepods.  Limnol. Oceanogr.  39: 479-485.

(6) LAURÉN-MÄÄTTÄ, C., J. HIETALA, AND M. WALLSS.  1997.  Responses of Daphnia pulex populations to toxic cyanobacteria.  Freshwater Biol.  37: 635-647.

(7) HEBERT, P. D. N., R. D. WARD, AND L. J. WEIDER.  1988.  Clonal-diversity patterns and breeding-system variation in Daphnia pulex, asexual-sexual complex.  Evolution.  42:147-159.

(8) HALL, D. J., AND G. G. WATERMAN.  1967.  Zooplankton of the Finger Lakes.  Limnol. Oceanogr.  12: 542-544.

(9) Hebert, P.D.N., The Daphnia of North America - an illustrated fauna, CD-ROM, Sept., 1995.

 

Voilà enfin la réponse à la question que vous vous posiez depuis longtemps.

 

 

 

 

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philippe charpentier - dans FIFIPÉDIA
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17 janvier 2010 7 17 /01 /janvier /2010 11:56







charlie parker technique mixte


Charlie Parker


elvin jones acrylique

Elvin Jones


john coltrane peinture charpentier

John Coltrane


mc coy tyner peinture acrylique

Mc Coy Tyner


miles davis painting on wood

Miles Davis


thelonious monk peinture

Thelonious Monk


tony williams peinture sur bois

Tony Williams

wayne shorter peinture

Wayne Shorter


Technique mixte, boite cd, bois , peintures,etc.

21/22,2cm
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17 janvier 2010 7 17 /01 /janvier /2010 04:45




coin de mur






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philippe charpentier - dans "Images du monde"
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16 janvier 2010 6 16 /01 /janvier /2010 10:16



estes reflets



Estes richard voiture



richard estes coursive



richard estes rue



richard estes vitrine


r estes dow jones


Autre article sur Richard Estes

" RICHARD ESTES "




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16 janvier 2010 6 16 /01 /janvier /2010 07:10


extraterrestres.jpg



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15 janvier 2010 5 15 /01 /janvier /2010 15:50





oreilles-de-venus.jpg

Poète ou gastronome ?
Pourquoi pas les deux ...






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