Npau suav teb yog ib txwm nyob rau Europe thiab Asia. Cov tsiaj tsis txhob txwm muab tso rau hauv Teb Chaws Asmeskas 'Great Lakes los ntawm kev tso tawm ntawm cov nkoj thauj khoom tsis huv ballast dej. Lawv tau pom thawj zaug hauv Lake Ontario xyoo 1982, thiab kis mus rau Lake Superior los ntawm 1987.
Puas yog spiny Waterflea nyob rau Minnesota?
Ntxhais dej qias neeg yog ib txwm nyob rau Europe thiab Asia. Lawv tau pom thawj zaug hauv Lake Superior xyoo 1987 thiab thawj zaug pom nyob rau hauv lub pas dej Minnesota hauv Island Lake Reservoir sab qaum teb ntawm Duluth xyoo 1990. Niaj hnub no, lawv pom nyob rau hauv Lake Mille Lacs, Lake of the Woods, thiab Lake Vermilion.
Puas yog cov dev mub yog ib hom kab mob?
Spiny waterflea ntes tau ntawm kab nuv ntses. Koj puas paub? … Spiny waterflea is an invasive zooplankton (cov kab mob me me uas taug kev los ntawm cua thiab dej ntws) uas yog los ntawm Eurasia. Hom kab mob no tshaj tawm cov hom tsiaj hauv tebchaws rau zaub mov, uas tuaj yeem cuam tshuam rau tag nrho lub vev xaib khoom noj.
Yuav ua li cas cov dej ntws ntws mus rau Canada?
Thawj cov lus ceeb toom ntawm spiny thiab fishhook waterfleas nyob rau hauv North America ob leeg nyob rau hauv Lake Ontario - spiny waterflea nyob rau hauv 1982 thiab fishhook waterflea nyob rau hauv 1998. Ob hom tau qhia rau lub Great Lakes nyob rau hauv ballast dej los ntawm dej hiav txwv -going ships. Spiny thiab fishhook waterfleas sau rau ntawm kab nuv ntses thiab nets.
pom cov dev mub nyob qhov twg?
Ntau daim ntawv yogpom nyob rau hauv thaj chaw dej ntshiab, tab sis ob peb tshwm sim hauv ib puag ncig marine. Qhov zoo tshaj plaws genus yog Daphnia, ubiquitous nyob rau hauv lub pas dej thiab ntws nyob rau hauv cov teb chaws Europe thiab North America. Cov dej flea yog qhov me me, feem ntau ntsuas tsuas yog li 0.2 txog 3.0 millimeters (0.01 txog 0.12 nti) ntev.
