File:Jonycunha - dragonfly (by-sa) (2).jpg
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DescriptionJonycunha - dragonfly (by-sa) (2).jpg |
A larva se tranforma em avião Duas a três semanas depois de postos os ovos, surgem as larvas das libélulas. Começa então um longo ciclo de vida aquática, que, em algumas espécies, pode durar até cinco anos. Em sua existência submersa, a larva se alimentará de microcrustáceos, filhotes de peixes e outras larvas __ ela atua como ápice de uma importante cadeia alimentar dos ambientes aquáticos dos rios e lagos __ e passará por até 15 sucessivas metamorfoses até se transformar em uma naiade, que já se assemelha ao inseto adulto porém se movimenta no meio aquático através de jatos de água que saem pelo reto, como um sifão. Em um dado momento, atendendo aos chamados de um relógio biológico, cujo mecanismo permanece inexplicado, a naiade faz a transição do meio aquático para o terrestre onde fará sua última metamorfose. A escalada do trampolim para o novo mundo é feita geralmente à noite, para escapar dos predadores. Subindo pela haste de alguma planta, a larva para de se alimentar e se mantém várias horas imóvel se preparando para a mudança. A libélula rompe seu último exoesqueleto pelo dorso, liberando primeiro a cabeça e o tórax e depois o abdômen (o processo leva de 30 a 40 minutos). Suas asas, úmidas, precisarão de duas a três horas para se solidificarem em contato com o ar, quando a libélula estará, então, aparelhada e pronta para decolar. www.institutoaqualung.com.br/info_libelula18.html |
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Source |
[https://www.flickr.com/photos/40279385@N08/4346833452/ ENSAIO COM UMA LIB�LULA - parte 5 de 5 (Test with a Dragonfly - part 5 from 5)]
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Author | [https://www.flickr.com/people/40279385@N08 J�natas Cunha] from Itape�na, Brasil |
Camera location | 24° 35′ 45.55″ S, 48° 12′ 56.02″ W ![]() | View this and other nearby images on: OpenStreetMap | ![]() |
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This image, originally posted to Flickr, was reviewed on March 8, 2010 by the administrator or reviewer File Upload Bot (Magnus Manske), who confirmed that it was available on Flickr under the stated license on that date. |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 10:06, 30 January 2011 | ![]() | 1,024 × 560 (78 KB) | Taxocat (talk | contribs) | crop |
18:53, 8 March 2010 | ![]() | 1,024 × 768 (393 KB) | File Upload Bot (Magnus Manske) (talk | contribs) | {{Information |Description=A larva se tranforma em avi�o Duas a tr�s semanas depois de postos os ovos, surgem as larvas das lib�lulas. Come�a ent�o um longo ciclo de vida aqu�tica, que, em algumas esp�cies, pode durar at� cinco anos. Em s |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | SONY |
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Camera model | DSC-H50 |
Exposure time | 1/250 sec (0.004) |
F-number | f/5 |
ISO speed rating | 100 |
Date and time of data generation | 12:45, 24 January 2010 |
Lens focal length | 78 mm |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Paint Shop Pro Photo 12,00 |
File change date and time | 11:06, 30 January 2011 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 12:45, 24 January 2010 |
Image compression mode | 4 |
APEX exposure bias | 0.3 |
Maximum land aperture | 2.875 APEX (f/2.71) |
Metering mode | Center weighted average |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Color space | Uncalibrated |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Scene capture type | Standard |
Contrast | Normal |
Saturation | Normal |
Sharpness | Hard |