Acqua di neve

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Inizio di marzo con tempo instabile, ma qualche giorno di tregua del meteo avverso fanno ben sperare per poter finalmente frequentare il torrente preferito dal quale sono stato lontano per tutto il periodo invernale.

Durante il viaggio per raggiungere la meta prefissata controllo più volte il corso d’acqua al lato della strada, questo appare abbastanza soddisfacente, sia come colore che come livelli, l’adrenalina comincia a salire dentro di me.

Veloce vestizione con controllo dell’attrezzatura e sono subito sulla sponda del torrente. Ho l’abitudine, prima di montare la canna, di dedicarmi all’osservazione dell’ambiente che mi circonda per decidere come pescare e quale artificiale legare al finale, questo perché nell’azione di pesca mi piace simulare come la Natura offre il cibo ai pesci che andrò ad insidiare.

Acqua di neve
Acqua velata e biancastra: acqua di neve.

E’ in quel momento che mi accorgo che l’acqua, vista da vicino, appare velata, biancastra, e realizzo la possibilità della presenza di acqua di neve, fenomeno favorito dal rapido innalzamento della temperatura della notte precedente dovuto al vento caldo sud-occidentale da noi chiamato “Garbino”. In queste situazioni il pesce diminuisce l’attività predatoria fino a cessarla del tutto, del resto non vale la pena bruciare energie preziose quando le stesse servono a combattere la bassa temperatura dell’acqua che lo circonda.

Da un veloce sguardo all’ambiente circostante mi rendo anche conto che, ovviamente, non ci sono insetti in schiusa e così decido di provare a ninfa nella remota speranza di invogliare qualche trota sul fondo.

Leuctra sp. - Plecottero della famiglia Leuctridae.
Leuctra sp., plecottero della famiglia Leuctridae.

Passate le 13:00, dopo un paio d’ore di inutili tentativi, la mia attenzione viene attratta da un sasso della sponda sulla cui superficie intravedo la sagoma di un piccolo plecottero, è una Leuctra, tipica specie del periodo. Anche le Baetis rhodani sono una specie di efemerottero tipico di questo periodo, ma oggi sono totalmente assenti a riprova che la temperatura dell’acqua è troppo bassa e ne ha bloccato la maturazione delle ninfe.

Exuvia di plecottero della fam. Taeniopterygidae.
Exuvia di plecottero della fam. Taeniopterygidae.

Riposta la canna mi dedico con successo alla ricerca di altri esemplari di Leuctra, ne trovo altri intenti a scaldarsi sui sassi e, fra questi, ce n’è uno con una exuvia di Taeniopterygidae, altra specie di plecottero d’inizio stagione.

Ninfa matura di Leuctra sp., plecottero della fam. Leuctridae.
Ninfa matura di Leuctra sp., plecottero della fam. Leuctridae.
Ecdyonurus sp., efemerottero della fam. Heptageniidae.
Giovane ninfa di Ecdyonurus sp., efemerottero della fam. Heptageniidae.

Spinto dall’interesse di approfondire l’indagine entomologica, comincio a perlustrare i sassi del sottoriva alla ricerca degli stadi ninfali delle specie presenti. L’acqua è davvero gelida ed in breve tempo le mani si ghiacciano, ma, a riprova della presenza degli stadi alati, riesco a documentare delle ninfe di Leuctra in procinto di schiudere. Trovo anche una giovane ninfa di Ecdyonurus e piccoli esemplari di Baetis, ancorate sotto un sasso ci sono anche delle piccole larve di tricotteri Sericostomatidae nei loro astucci, fra un paio di mesi saranno mature.

Larve di tricottero della fam. Sericostomatidae nei loro astucci.
Larve di tricottero della fam. Sericostomatidae nei loro astucci.

Per rispetto all’ambiente che mi ospita ripongo sempre al loro posto ogni singolo sasso che sposto, facendo anche attenzione a non entrare in acqua se non strettamente necessario in quanto il fondale dei corsi d’acqua brulica di vita ed ha un preciso valore nella catena alimentare.

Roberto

52 thoughts on “Acqua di neve”

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    E’ in quel momento che mi accorgo che l’acqua, vista da vicino, appare velata, biancastra, e realizzo la possibilità della presenza di acqua di neve, fenomeno favorito dal rapido innalzamento della temperatura della notte precedente dovuto al vento caldo sud-occidentale da noi chiamato “Garbino”. In queste situazioni il pesce diminuisce l’attività predatoria fino a cessarla del tutto, del resto non vale la pena bruciare energie preziose quando le stesse servono a combattere la bassa temperatura dell’acqua che lo circonda.

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  43. Natalia

    However, unwanted effects can occur as a outcome of
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    (2002) and Stellato (2004)). Many of these genes are generally over-expressed throughout persistent non-resolving inflammation. The pathophysiological mechanisms by
    which corticosteroids affect the cardiovascular system have been considered in existing literature.
    The existence of those physiological changes in the hours and days instantly after CSI led to the selection of 1 week following
    injection as the time interval for this examine.
    Steroid injections, additionally known as corticosteroid injections, are anti-inflammatory medicines used
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    In 2004, I was in the middle of the Tour de France, I did a transfusion, I’d given blood
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  44. Are Steroids A Drug

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    In reducing inflammation and immune response, corticosteroids assist to forestall injury to the tissues in your physique.
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    We accessed the GREAT database (Global Resource for EczemA Trials (Centre
    of Proof Primarily Based Dermatology) at on 19 July 2018 (browsed to the Topical corticosteroids section and exported all related
    records). GREAT has not been up to date since
    2017 so we did not undertake any further searches of this database.
    All randomised managed trials (RCTs) the place randomisation is at any degree (including cluster and within‐participant trials).
    The severity of eczema can range enormously,
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    The course of eczema may range from a relapsing‐remitting one affecting a quantity of areas recurrently to a continuous
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    most of the body (Berke 2012).
    We pooled 4 trials that compared moderate‐ versus mild‐potency topical corticosteroids (420 participants).
    We pooled 9 trials that in contrast potent versus mild‐potency topical
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    likely end in a big improve in number attaining remedy success (70% versus 39%;
    OR three.71, 95% CI 2.04 to 6.seventy two; moderate‐certainty evidence).
    We pooled 15 trials that in contrast potent versus moderate‐potency topical corticosteroids (1053 participants).

    There was inadequate proof of a advantage of potent topical corticosteroids in comparability with average topical corticosteroids (OR 1.33, 95% CI
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    Inhaled steroids can treat asthma in most individuals,
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    The length of therapy will depend on the severity of your
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    and ointments, we might help you find one of the best treatment on your skin and help you in successfully managing your situation. Known as Class I superpotent
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    Vanos), or clobetasol propionate (e.g. Ultravate).

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