Canto d’autunno

L’inverno è alle porte e i nostri centri urbani si popolano di vivaci pettirossi che il freddo rende più intraprendenti. Agli individui che vi risiedono abitualmente tutto l’anno si aggiungono quelli delle vicine montagne e alcuni arrivano da molto lontano, dalle fredde terre del Nord Europa.

E’ con estremo piacere che scienzafacile dà inizio alla rubrica di fotografia naturalistica, ‘La foto del mese’.

Alessandra Morgillo 17 novembre 2010

Erithacus rubecola_A.Morgillo

Erithacus rubecola Foto A.Morgillo

L’inverno è alle porte e i nostri centri urbani si popolano di vivaci pettirossi che il freddo rende più intraprendenti. Agli individui che vi risiedono abitualmente tutto l’anno si aggiungono quelli delle vicine montagne e alcuni arrivano da molto lontano, dalle fredde terre del Nord Europa.

L’aria dolce e indifesa di questo uccellino cela un’indole solitaria e territoriale, non divide la propria area di alimentazione con individui della stessa specie, anzi la difende gelosamente mostrando, fiero, l’inconfondibile macchia arancione. Diventa quindi necessario affermare il territorio conquistato, così sia i maschi che le femmine, che d’aspetto si assomigliano molto, cantano. Il Pettirosso è uno dei pochi uccelli che canta tutto l’anno, tra i primi a farsi sentire all’alba e uno degli ultimi a smettere la sera. Anzi, non è improbabile sentire i suoi armoniosi vocalizzi anche di notte, specialmente nelle aree urbane soggette a disturbo antropico (inquinamento acustico, forte illuminazione). Il segnale deve giungere forte e chiaro ai propri simili e durante le ore notturne, quando il traffico è minore, il canto può risultare più efficace.

Ascolta il canto del pettirosso

Mene rhombea …il restauro di un fossile!

Il lavoro di ‘fossil preparator’ ovvero italianizzato in ‘preparatore di fossili’ mi ha portato la scorsa estate a restaurare per un privato, un pesce fossile acquistato negli anni ’50, molto malconcio, proveniente dagli scavi dell’eocene medio di Bolca e a farne un pezzettino da museo…

Stefano Rossignoli 14 Novembre 2010

Il lavoro di  ‘fossil preparator’ ovvero italianizzato in ‘preparatore di fossili’ mi ha portato la scorsa estate a restaurare per dei privati, un pesce fossile acquistato negli anni ’50, molto malconcio, proveniente dagli scavi dell’eocene medio di Bolca e a farne orgogliosamente un pezzettino da museo…

Questo lo spettacolo che mi si è presentato davanti agli occhi quando sono andato a visitare il pezzo per la prima volta:

Come vedete, fratture sparse in ogni dove, una davvero importante ed anche la lastra parzialmente scivolata fuori dalla sua sede…

Come ho agito?

Leggi tuttoMene rhombea …il restauro di un fossile!”

E’ autunno! Solstizio o equinozio?

La parola equinozio è composta da due parti: equi che significa uguale e nozio che significa notte. Il suo significato è quindi ‘notte uguale al giorno’!

Vediamo ora cosa governa la durata del giorno e della notte.

Stefano Rossignoli 11 novembre 2010.

Se vuoi, leggi anche:”Perchè vediamo costellazioni diverse nelle diverse stagioni“.

E’ autunno inoltrato e gli argomenti di cui parlare sono innumerevoli ma per ora parlerò del meccanismo per cui le giornate si accorciano e si allungano col trascorrere dei giorni dell’anno.

Intanto godiamoci questi splendidi Larici (Larix decidua) in abito autunnale…

A.Morgillo_lago Federa, nelle dolomiti bellunesi (Cortina d'Ampezzo)

A. Morgillo – lago Federa, nelle dolomiti bellunesi (Cortina d’Ampezzo).

Vi introduco all’argomento ‘chiacchierando’ un po’ come al solito…

Sapete cos’è una notte polare? Immagino di si! E’ buio per giorni e giorni, il sole manca per mesi, poi arriva il crepuscolo e poi finalmente il sole.
Io purtroppo non l’ho mai vista né vissuta , ma dovrebbe andare così!
Quando al polo nord è notte, al polo sud è giorno.
Quando al polo nord è notte, da noi (in Italia intendo) è autunno-inverno e le giornate sono corte. Le ore di luce sono poche rispetto a quelle buie.
Nell’altro emisfero, accade il contrario: E’ primavera-estate e le ore di luce sono molte rispetto a quelle buie…
A sud una cosa e a nord esattamente l’opposto.
E all’equatore che si trova a metà tra nord e sud, cosa succede?
Abbiamo già risposto con la domanda! Succede esattamente la metà, cioè stesse ore di luce e di buio durante tutto il corso dell’anno e, visto che il giorno è di 24 ore, saranno 12 ore di luce e 12 ore di buio!
All’equatore quindi la situazione è sempre costante. E’ un equinozio tutti i giorni!
La parola equinozio è composta da due parti: equi che significa uguale e nozio che significa notte. Il suo significato è quindi ‘notte uguale al giorno’!

Vediamo ora cosa governa la durata del giorno e della notte. Leggi tutto “E’ autunno! Solstizio o equinozio?”

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