Komarci

komaracKomarci (Culicidae) su porodica kukaca koja je svrstana u red dvokrilaca.

Porodica ima oko 50 rodova i obuhvaća oko 33.000 vrsta. Razvili su se prije oko 170 milijuna godina.

Komarci nastanjuju sva područja na svijetu, osim polarnih područja, pustinja i područja viših od 1500 metara nadmorske visine, ali najčešće u blizini vode, neovisno o njenoj veličini i kvaliteti. No, različite vrste žive u vrlo različitim područjima.

Komarci su najaktivniji u sumrak ili u rano jutro, odnosno tijekom noći, kada je izraženija vlažnost zraka i niža temperatura. Izuzetak od toga čini Azijski tigrasti komarac (Aedes albopictus), koji je stigao i u Hrvatsku, a koji bode tijekom čitavog dana, agresivniji je i potiskuje domicilnu vrstu komaraca. Ta vrsta komarca vrlo je prilagodljiva te se razvija u različitim vrstama umjetnih legla, brzo se razmnožava i osvaja nova staništa. Komarci su leteći insekti (kukci) za koje je karakteristično da im je za razvoj neophodna stajaća voda. Prirodna su legla komaraca nepresušene lokve, močvare, privremeno poplavljene površine. Umjetna legla najčešće nastaju ljudskim aktivnostima, a čine ih npr. otklopljeni spremnici za vodu, začepljeni slivnici i oluci, različiti odbačeni predmeti u kojima se nakuplja kišnica.

Veliki su od 0,3 do 2 cm. Zbog svoje male građe u mogućnosti su naseliti vrlo nepristupačna staništa. Imaju usko tijelo, grbava prsa, vitke noge. Spada u opasnije štetočine jer prenosi malariju, groznicu i druge bolesti. Pri sisanju krvi komarac unosi u čovjeka sekret u kome može biti i uzročnik bolesti. Prilikom uboda mogu uzrokovati kožne promjene i alergijske reakcije. Uznemiruju i ometaju odmor, aktivnost, šetnje i boravak na otvorenom. Ženke komarca nakon oplodnje moraju sisati krv jer za izgradnju jajašaca trebaju proteine. Inače se oba spola hrane nektarom i sokovima voća, koji ne sadrže protein.

Čim se izlegu, odrasli mužjaci nakon kratkog vremena formiraju svoj novi roj. Roj je kod komaraca skupina mužjaka koji se vrtložno kreću gore dolje. U takav novoformirani roj komaraca ulijeće ženka i oplođuje se sa odabranim partnerom. Kod pojedinih vrsti komaraca oplodnja se odvija u zraku, ali ipak većina vrsti za oplodnju izabere neko mirno skrovito mjesto.

Ženka komarca polaže u stajaću vodu jaja iz kojih se razvijaju ličinke. Iz stadija ličinki nastaju kukuljice, a iz kukuljica se razvijaju odrasli komarci. Prva tri stadija životnoga ciklusa komarca odvijaju se u vodi, a odrastao komarac je leteći kukac. Razvoj odrasle jedinke traje otprilike od tjedan dana do nekoliko tjedana, ovisno o temperaturi vode. S javnozdravstvenog aspekta značajno je da ženka komarca mora imati krvni obrok kako bi mogla razviti i položiti jaja i zato napada, između ostalog, i čovjeka. Komarci se legu u vodama stajačicama: • polažu jajašca u vode stajačice, • u vodi se iz jajašaca razvijaju ličinke komaraca, • iz ličinki nastaju kukuljice, • iz kukuljica izlijeću odrasli komarci.

Rojenje je vrlo specifično ponašanje kukaca i njihov je način opstanka i širenja vrste. Za rojenje svakoj zajednici kukaca potrebno je uskladiti neke od uvjeta, a kod komaraca su: stanje aktivnosti komarca, prostorni odnosi, svjetlost, vjetar, zvuk, zajednica različitih vrsta komaraca te temperatura i vlažnost. Stanje aktivnosti je najznačajniji uvjet komaraca da formiraju roj.

Kukci nepogriješivo predosjećaju dolazak zimskih dana prije svega kraćim trajanjem dnevne svjetlosti, nižih noćnih i dnevnih temperatura i slično, ovisno o vrsti. Većina vrsta komaraca zimu prezimljuje u stadiju jajašaca. Ženka zadnje generacije prije zime mora pomno odabrati mjesto polaganja zimskih jaja koja moraju osim vremenskih neprilika biti sačuvana i od eventualnih neprijatelja.

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