|
Vähid (kordamine) 1. Iseloomusta jõevähi süstemaatilist kuuluvust (lisa ka tunnused, mille põhjal ta vastavasse rühma kuulub). .......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... 2. Milline ökoloogiline roll on vähkidel veekogus (nii väikestel kui ka suurtel vähkidel)? .......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... 3. Millistel vähkidel on tööstuslik tähtsus (täpsusta ka, milline)? .......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... 4. Miks ei soovitata samade vähipüügiriistadega püüda eri veekogudest? .......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... 5. Millised liigid järgnevast loetelust kuuluvad vähkide hulka? Jaga vähiliigid kolme rühma. Kirjelda iga rühma paari lausega. Merikilk, kalmaar, vesikirp, selgsõudur, mudatuplane, keldrikakand, tõruvähk, erakvähk, sõudik, villkäppkrabi, homaar, puruvana, langust, jõevähk, soomukas. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... |