The cetaceans yog cov muaj nyob rau hauv ancient dab neeg thiab legends. Lawv yog cov tsiaj uas ib txwm aroused zoo txaus siab rau ib feem ntawm tib neeg beings. Cov tsiaj no, feem ntau, yog qhov tsis paub zoo tias, me ntsis zuj zus, tab tom ploj mus yam tsis muaj peb pom tias ua dab tsi.
Nyob rau hauv tsab xov xwm no peb yuav tham txog cetaceans, lawv yog dab tsi, lawv yam ntxwv, lawv nyob qhov twg thiab lwm yam xav paub. Koj puas xav paub ntxiv txog cov neeg nyob hauv hiav txwv tob? Mus nyeem ntawv!
Cetaceans yog dab tsi?
The order of the cetaceans is made up of two suborders, the mysticetes, formed by the baleen whales, and the odontocetes , ua los ntawm cetaceans nrog cov hniav, xws li phev whales, dolphins thiab killer whales.
Cov evolution ntawm cetaceans tau coj mus rau ib qho zoo sib xws ntawm ob lub suborders nyob, uas tshwm sim los ntawm lub evolutionary convergence Cov yam ntxwv ntawm cov qauv ntawm cov ob pawg, xws li cov duab ntawm lub cev, txoj hauj lwm ntawm lub qhov ntswg los yog zawv zawg ntawm lub taub hau, qhov tsis muaj suab nrov, thiab cov duab zoo sib xws ntawm lub ntsws qhia tias cov tsiaj no tau hloov zuj zus los ntawm cov poj koob yawm txwv sib txawv rau cov tsiaj uas zoo sib xws. sib pab.
Yog li ntawd, cov tsiaj txhu cetacean yog cov kab mob ntsws uas nyob hauv peb lub hiav txwv thiab dej hiav txwv, txawm tias qee hom tsiaj nyob hauv dej.
Cetaceans
Cetacea yog cov yam ntxwv ntawm lawv lub cev, morphology, physiology thiab chaw nyob. Cov yam ntxwv tseem ceeb ntawm cetaceans yog:
NOJ ZWM A ZAUB NTIM HAIV NEEG HAIV NEEG
NOJ NIAM TAWM Muaj Tam Sim No-ay
cetaceans nyob qhov twg?
Cetaceans yog qhov chaw nyob Aquatic EnvironmentYog tsis muaj nws, lawv daim tawv nqaij yuav qhuav thiab lawv yuav tuag. Qee cov cetaceans nyob hauv cov dej ncig, piv txwv li cov beluga (Delphinapterus leucas) lossis narwhal (Monodon monoceros), yog li lawv tau yoog rau qhov kub thiab txias. Lwm tus muaj ntau qhov chaw sov, xws li pilot whale (Globicephala melas) thiab pilot whale (Globicephala macrorhynchus).
Ib txhia ntawm cov tsiaj no nyob hauv dej tshiab, lawv yog cov tsiaj txhu uas muaj kev phom sij heev, feem ntau yog vim muaj kuab paug ntawm cov dej ntws, kev tsim kho. ntawm dams thiab kev ntxub ntxaug tua tsiaj. Cov npe ntawm cetaceans uas nyob hauv cov dej ntws yog:
- Bolivian dolphin (Inia boliviensis)
- Araguaia River dolphin (Inia araguaiaensis)
- Pink Dolphin (Inia geoffrensis)
- Silver Dolphin (Pontoporia blainvillei)
- Baiji (Lipotes vexillifer)
- Indus Dolphin (Platanista minor)
- Ganges Dolphin (Platanista gangetica)
coob coob ntawm cetaceans migrations txhua xyoo los ntawm lawv qhov chaw pub rau lawv thaj chaw yug me nyuam. Nov yog lub sijhawm uas cov tsiaj no tiv thaiv tsis tau.
Nyob rau hauv daim duab peb pom ib tug liab ntses taub ntswg ntev:
Type of cetaceans:
Cetaceans raug faib ua ob pawg loj: mysticetes thiab odontecetes.
1. Mysticetes
Mysticetes, feem ntau hu ua whales, muaj tsawg heev thiab feem ntau tshwm sim los ntawm muaj baleen es tsis txhob ntawm cov hniav. Lawv yog cov tsiaj loj loj thiab feem ntau nyob hauv dej txias. Ib txhia ntawm nws hom tsis tau pom thaum lub sij hawm whale saib rau xyoo lawm. Feem ntau hom baleen whales yog:
- Pacific Right Whale (Eubalaena japonica)
- Greenland Whale (Balaena mysticetus)
- Fin whale (Balaenoptera physalus)
- Blue Whale (Balaenoptera musculus)
- Humpback Whale (Megaptera novaeangliae)
- Grey whale (Eschrichtius robustus)
- Pygmy right whale (Caperea marginata)
Nyob hauv daim duab peb pom tau ib tug whale:
ob. Odontocetes
Odontocetes yog cetaceans nrog cov hniav tseeb, ntau dua los yog tsawg dua. Lawv muaj ntau heev thiab suav nrog ntau hom zoo. Lawv yog cov Qhov zoo tshaj plaws paub hom odontocetes yog:
- Pilot pilot whale (Globicephala melas)
- dolphin Southern (Lagenorhynchus australis)
- Orca (Orcinus orca)
- Striped dolphin (Stenella coeruleoalba)
- Bottlenose dolphin (Tursiops truncatus)
- Atlantic dolphin (Lagenorhynchus acutus)
- Sooty Dolphin (Lagenorhynchus obscurus)
- Harbor porpoise (Phocoena phocoena)
- Vaquita porpoise (Phocoena sinus)
- Spectacled Porpoise (Phocoena dioptrica)
- Sperm whale (Physeter macrocephalus)
- Pygmy phev whale (Kogia breviceps)
- Dwarf phev whale (Kogia sima)
- Blainville beaked whale (Mesoplodon densirostris)
- Gervais's beaked whale (Mesoplodon europaeus)
- Grey's beaked whale (Mesoplodon greyi)
Nyob hauv daim duab peb pom ib tug pilot whale:
