Berkas:Ghost Crab, Atlantic Ocean, Nags Head, Outer Banks, North Carolina (14261902357).jpg
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Ringkasan
DeskripsiGhost Crab, Atlantic Ocean, Nags Head, Outer Banks, North Carolina (14261902357).jpg |
Ghost crabs are semiterrestrial crabs of the subfamily Ocypodinae. They are common shore crabs in tropical and subtropical regions throughout the world, inhabiting deep burrows in the intertidal zone. They are generalist scavengers and predators of small animals. The name "ghost crab" derives from their nocturnality and their generally pale coloration. They are also sometimes called sand crabs, though the name refers to various other crabs that do not belong to the subfamily. Characteristics of the subfamily include one claw being larger than the other, thick and elongated eyestalks, and a box-like body. The differences in claw sizes, however, are not as marked as in male fiddler crabs. The subfamily includes 22 species in two genera. Most ghost crabs have pale-colored bodies that blend in well with the sand, though they are capable of gradually changing body coloration to match their environments and the time of day. Ghost crabs dig deep burrows near the intertidal zone of open sandy beaches. The burrows are usually composed of a long shaft with a chamber at the end, occasionally with a second entrance shaft. They are semi-terrestrial and breathe oxygen from the air through moistened gills. They must periodically wet their gills with seawater,[1][9] usually by taking water from moist sand or by running into the surf and letting the waves wash over them. However, they can only remain under water for a limited amount of time, as they will drown. Ghost crabs are generalists, scavenging carrion and debris, as well as preying on small animals, including sea turtle eggs and hatchlings, clams, and other crabs. They are predominantly nocturnal. They remain in their burrows during the hottest part of the day, and throughout the coldest part of the winter. Ghost crabs are swift runners, darting away at the slightest sign of danger. They either head back to their burrows or plunge into the sea to escape intruders. The gaits of ghost crabs alter as their speed increases. Observations on O. ceratophthalma show it can walk indefinitely using all four pairs of walking legs, occasionally alternating which side leads. At higher speeds, the fourth pair of legs is raised off the ground, and at the highest speeds, the crab runs, using only the first and second pairs of walking legs. Ghost crabs also have the ability to change colors to match their surroundings by adjusting the concentration and dispersal of pigments within their chromatophores. They can even match the specific colors of the grains of sand in their habitats. However, unlike metachrosis (which is a rapid change of colors), ghost crabs are only capable of morphological color change, which occurs over a longer span of time. <a href="http://en.wikipedia.org/wiki/Ghost_crab" rel="nofollow">en.wikipedia.org/wiki/Ghost_crab</a> <a href="http://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License" rel="nofollow">en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_...</a> |
Tanggal | |
Sumber | Ghost Crab, Atlantic Ocean, Nags Head, Outer Banks, North Carolina |
Pembuat | Ken Lund from Reno, Nevada, USA |
Lokasi kamera | 35° 53′ 12,62″ U, 75° 34′ 58,91″ B | Lihat gambar ini dan gambar di sekitarnya di: OpenStreetMap | 35.886838; -75.583031 |
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This image was originally posted to Flickr by Ken Lund at https://flickr.com/photos/75683070@N00/14261902357 (archive). It was reviewed on 11 Februari 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-sa-2.0. |
11 Februari 2020
Items portrayed in this file
menggambarkan
some value
35°53'12.617"N, 75°34'58.912"W
17 Juni 2014
exposure time Inggris
0.01666666666666666666 detik
f-number Inggris
5
focal length Inggris
22,525 milimeter
ISO speed Inggris
320
image/jpeg
Riwayat berkas
Klik pada tanggal/waktu untuk melihat berkas ini pada saat tersebut.
Tanggal/Waktu | Miniatur | Dimensi | Pengguna | Komentar | |
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terkini | 11 Februari 2020 02.24 | 976 × 1.304 (929 KB) | Ser Amantio di Nicolao | Transferred from Flickr via #flickr2commons |
Penggunaan berkas
Halaman berikut menggunakan berkas ini:
Metadata
Berkas ini mengandung informasi tambahan yang mungkin ditambahkan oleh kamera digital atau pemindai yang digunakan untuk membuat atau mendigitalisasi berkas. Jika berkas ini telah mengalami modifikasi, rincian yang ada mungkin tidak secara penuh merefleksikan informasi dari gambar yang sudah dimodifikasi ini.
Produsen kamera | Canon |
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Model kamera | Canon PowerShot SX280 HS |
Waktu pajanan | 1/60 detik (0,016666666666667) |
Nilai F | f/5 |
Rating kecepatan ISO | 320 |
Tanggal dan waktu pembuatan data | 17 Juni 2014 17.48 |
Jarak fokus lensa | 22,525 mm |
Lintang | 35° 53′ 12,62″ N |
Bujur | 75° 34′ 58,91″ W |
Ketinggian | 3,8 meter di bawah permukaan laut |
Orientasi | Normal |
Resolusi horizontal | 180 dpi |
Resolusi vertikal | 180 dpi |
Perangkat lunak | Microsoft Windows Photo Gallery 6.0.6001.18000 |
Tanggal dan waktu perubahan berkas | 17 Juni 2014 18.20 |
Penempatan Y dan C | Atas (co-sited) |
Versi Exif | 2.3 |
Tanggal dan waktu digitalisasi | 17 Juni 2014 17.48 |
Arti tiap komponen |
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Mode kompresi gambar | 3 |
Kecepatan rana APEX | 5,90625 |
Bukaan APEX | 4,65625 |
Bias pajanan | −0,33333333333333 |
Bukaan tanah maksimum | 4,65625 APEX (f/5,02) |
Mode pengukuran | Pola |
Kilas | Lampu kilat menyala, lampu kilat diperlukan |
Dukungan versi Flashpix | 1 |
Ruang warna | sRGB |
Resolusi bidang fokus X | 16.393,442622951 |
Resolusi bidang fokus Y | 16.393,442622951 |
Unit resolusi bidang fokus | inci |
Metode penginderaan | Sensor area warna satu keping |
Sumber berkas | Kamera diam digital |
Proses buatan gambar | Proses kustom |
Mode pajanan | Pajanan manual |
Keseimbangan putih | Keseimbangan putih otomatis |
Rasio pembesaran digital | 1 |
Tipe penangkapan | Standar |
Waktu GPS (jam atom) | 00.48 |
Status penerima | Pengukuran sedang berlangsung |
Data survei geodesi | WGS-84 |
Tanggal GPS | 18 Juni 2014 |
Versi tag GPS | 2.3.0.0 |