stdClass Object ( [id] => 1072116 [title] => Još nije jasno što uzrokuje cvjetanje meduza: neke mogu biti opasne za ljude, dr. Alen Soldo savjetuje što učiniti ako dođe do kontakta [alias] => sve-je-vise-meduza-u-nasem-moru-dr-soldo-savjetuje-sto-uciniti-ako-dode-do-kontakta [catid] => 420 [published] => 1 [introtext] => [fulltext] =>

U posljednje vrijeme počeo sam primjećivati različite meduze u različito doba godine, pa me zanima koje su opasne i zašto ih uopće toliko ima.

Vedran M., Brač

Meduze su inače stari stanovnici Mediterana i Jadrana, te ih se oduvijek moglo vidjeti u moru, ali ono što se kod njih promijenilo je pojava tzv. cvjetanja meduza, koja se počela događati prvih nekoliko godina ovog stoljeća. Cvjetanje meduza je situacija kad ovi želatinozni organizmi dolaze u priobalne vode u ogromnim količinama i, ovisno o sezoni, uzrokuju različite probleme.

Primjerice, plivači ih baš ne vole, jer poneke od njih mogu biti opasne za zdravlje ljudi, s obzirom na to da im posljedice fizičkog kontakta variraju od slabog peckanja pa sve do ozbiljnih zdravstvenih problema. Nadalje, ribarima predstavljaju poseban problem, jer ne samo što im zatrpaju ribolovne mrežne alate na način da postanu doslovno neupotrebljivi za ribolov, nego se povećano hrane larvama riba, što uzrokuje i dodatno smanjenje ulova.

Istraživanje uzroka

U posljednjih nekoliko godina zabilježeni su i brojni primjeri privremenog zatvaranja morskih sustava za hlađenje koje koriste različita industrijska postrojenja zbog začepljenja uzrokovanih brojnim meduzama. Stoga je utjecaj cvjetanja meduza sa socio-ekonomskog stajališta vrlo jasan.

Također, s ekološkog stajališta utjecaj cvjetanja meduza pomno se prati, jer već postoje bojazni da je cvjetanje zapravo signal upozorenja na promjene u moru koje se u doglednoj budućnosti neće moći zvati ribljim, nego želatinoznim svijetom.

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Najveći je problem pri tome zapravo činjenica da još nije jasno što točno uzrokuje cvjetanje meduza. Iako se pretpostavlja da je prelov vjerojatno najznačajniji (manje ribe hrane se meduzama, pa njihov broj raste), i neki drugi čimbenici vjerojatno imaju sličan ili jednak utjecaj. Primjerice, degradacija obale i klimatske promjene. Stoga se u Mediteranu, a time i u Jadranu, pomno prate cvjetanja kako bi se pokušali ustanoviti razlozi nastajanja, a time i buduća prevencija.

Kad već govorimo o Jadranu, recimo da je zasad u našem moru prisutno nekoliko vrsta meduza, pri čemu razlikujemo hidromeduze, koje ne predstavljaju nikakav problem jer ih ionako većina ljudi nikad ni ne primijeti, te skifomeduze, odnosno prave meduze, jer o njima zapravo i govorimo.

Od skifomeduza u Jadranu su zabilježeni uhati klobuk (Aurelia aurita), morska mjesečina (Pelagia noctiluca), kompas meduza (Chrysaora hysoscella), morska pluća (Rhizostoma pulmo), mediteranska meduza (Cotylorhiza tuberculata) i Benovićeva meduza (Pelagia benovici).

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Cotylorhiza tuberculata je bezopasna za ljude
Srđan Vrančić/Arhiv/Cropix
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Inače, meduze imaju simetrična tijela u obliku klobuka ili zvona. Tijelo im se sastoji od želatinozne tvari, pri čemu je udio vode do 99 posto. Na rubu klobuka nalazi se veći ili manji broj lovki između kojih su smješteni osjetni organi za svjetlo i ravnotežu. U klobuku se nalazi i sustav mišića, čijim se stezanjem istiskuje voda i tako se pokreću kroz more.

Hrane se planktonima i sitnim morskim životinjama koje hvataju svojim lovkama opremljenima žarnim stanicama. Zovu se tako jer sadrže organele, odnosno žarnice koje su zapravo kapsule s okidačem, oprugom i bodežićem na vrhu. Prilikom podražaja žarnica se aktivira, bodežić se zabija, ubrizga neurotoksin u ciljani organizam i paralizira ga.

Bodeži s otrovom

O vrsti toksina i količini koja se ubrizga kontaktom ovisi i klasifikacija meduza na neopasne i opasne za ljude, pri čemu su od jadranskih vrsta opasne morska mjesečina te, nešto manje, kompas meduza. Primjerice, nakon kontakta morske mjesečine s ljudskom kožom javlja se jaka bol i nastaju ozljede slične opeklinama koje teško zarastaju, a nakon njih ostaje depigmentacija kože ili čak i ožiljak. Slične ozljede javljaju se i pri kontaktu s kompas meduzom, ali ipak ne tako drastične.

Pretpostavljam da to mnogi znaju, ali za neupućene nije naodmet ponoviti da, ako dođe do kontakta s nekom od navedenih vrsta, treba izići iz mora i opečeno mjesto dobro isprati morskom vodom kako bi se uklonile lovke (nikako slatkom vodom ili nekim alkoholom), što znači da ranu nikako ne smijete trljati, iako je to mnogima prvi poriv. Ako ste u mogućnosti, dobro je na mjesto kontakta staviti ocat ili limunov sok jer će to spriječiti daljnje pucanje zaostalih žarnih čahura.

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Svoja pitanja vezana uz morsku tematiku pošaljite na adresu:
Otvoreno more
Slobodna Dalmacija
Hrvatske mornarice 4
21000 Split

ili na e-mail adresu: otvoreno-more@slobodnadalmacija.hr

Odgovara: dr. sc. Alen Soldo, Centar za studije mora Sveučilišta u Splitu

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Meduze koje su preplavile Prukljansko jezero
Nikolina Vuković Stipaničev/Arhiv/Cropix
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U posljednje vrijeme počeo sam primjećivati različite meduze u različito doba godine, pa me zanima koje su opasne i zašto ih uopće toliko ima.

Vedran M., Brač

Meduze su inače stari stanovnici Mediterana i Jadrana, te ih se oduvijek moglo vidjeti u moru, ali ono što se kod njih promijenilo je pojava tzv. cvjetanja meduza, koja se počela događati prvih nekoliko godina ovog stoljeća. Cvjetanje meduza je situacija kad ovi želatinozni organizmi dolaze u priobalne vode u ogromnim količinama i, ovisno o sezoni, uzrokuju različite probleme.

Primjerice, plivači ih baš ne vole, jer poneke od njih mogu biti opasne za zdravlje ljudi, s obzirom na to da im posljedice fizičkog kontakta variraju od slabog peckanja pa sve do ozbiljnih zdravstvenih problema. Nadalje, ribarima predstavljaju poseban problem, jer ne samo što im zatrpaju ribolovne mrežne alate na način da postanu doslovno neupotrebljivi za ribolov, nego se povećano hrane larvama riba, što uzrokuje i dodatno smanjenje ulova.

Istraživanje uzroka

U posljednjih nekoliko godina zabilježeni su i brojni primjeri privremenog zatvaranja morskih sustava za hlađenje koje koriste različita industrijska postrojenja zbog začepljenja uzrokovanih brojnim meduzama. Stoga je utjecaj cvjetanja meduza sa socio-ekonomskog stajališta vrlo jasan.

Također, s ekološkog stajališta utjecaj cvjetanja meduza pomno se prati, jer već postoje bojazni da je cvjetanje zapravo signal upozorenja na promjene u moru koje se u doglednoj budućnosti neće moći zvati ribljim, nego želatinoznim svijetom.

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Najveći je problem pri tome zapravo činjenica da još nije jasno što točno uzrokuje cvjetanje meduza. Iako se pretpostavlja da je prelov vjerojatno najznačajniji (manje ribe hrane se meduzama, pa njihov broj raste), i neki drugi čimbenici vjerojatno imaju sličan ili jednak utjecaj. Primjerice, degradacija obale i klimatske promjene. Stoga se u Mediteranu, a time i u Jadranu, pomno prate cvjetanja kako bi se pokušali ustanoviti razlozi nastajanja, a time i buduća prevencija.

Kad već govorimo o Jadranu, recimo da je zasad u našem moru prisutno nekoliko vrsta meduza, pri čemu razlikujemo hidromeduze, koje ne predstavljaju nikakav problem jer ih ionako većina ljudi nikad ni ne primijeti, te skifomeduze, odnosno prave meduze, jer o njima zapravo i govorimo.

Od skifomeduza u Jadranu su zabilježeni uhati klobuk (Aurelia aurita), morska mjesečina (Pelagia noctiluca), kompas meduza (Chrysaora hysoscella), morska pluća (Rhizostoma pulmo), mediteranska meduza (Cotylorhiza tuberculata) i Benovićeva meduza (Pelagia benovici).

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Cotylorhiza tuberculata je bezopasna za ljude
Srđan Vrančić/Arhiv/Cropix
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Inače, meduze imaju simetrična tijela u obliku klobuka ili zvona. Tijelo im se sastoji od želatinozne tvari, pri čemu je udio vode do 99 posto. Na rubu klobuka nalazi se veći ili manji broj lovki između kojih su smješteni osjetni organi za svjetlo i ravnotežu. U klobuku se nalazi i sustav mišića, čijim se stezanjem istiskuje voda i tako se pokreću kroz more.

Hrane se planktonima i sitnim morskim životinjama koje hvataju svojim lovkama opremljenima žarnim stanicama. Zovu se tako jer sadrže organele, odnosno žarnice koje su zapravo kapsule s okidačem, oprugom i bodežićem na vrhu. Prilikom podražaja žarnica se aktivira, bodežić se zabija, ubrizga neurotoksin u ciljani organizam i paralizira ga.

Bodeži s otrovom

O vrsti toksina i količini koja se ubrizga kontaktom ovisi i klasifikacija meduza na neopasne i opasne za ljude, pri čemu su od jadranskih vrsta opasne morska mjesečina te, nešto manje, kompas meduza. Primjerice, nakon kontakta morske mjesečine s ljudskom kožom javlja se jaka bol i nastaju ozljede slične opeklinama koje teško zarastaju, a nakon njih ostaje depigmentacija kože ili čak i ožiljak. Slične ozljede javljaju se i pri kontaktu s kompas meduzom, ali ipak ne tako drastične.

Pretpostavljam da to mnogi znaju, ali za neupućene nije naodmet ponoviti da, ako dođe do kontakta s nekom od navedenih vrsta, treba izići iz mora i opečeno mjesto dobro isprati morskom vodom kako bi se uklonile lovke (nikako slatkom vodom ili nekim alkoholom), što znači da ranu nikako ne smijete trljati, iako je to mnogima prvi poriv. Ako ste u mogućnosti, dobro je na mjesto kontakta staviti ocat ili limunov sok jer će to spriječiti daljnje pucanje zaostalih žarnih čahura.

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Svoja pitanja vezana uz morsku tematiku pošaljite na adresu:
Otvoreno more
Slobodna Dalmacija
Hrvatske mornarice 4
21000 Split

ili na e-mail adresu: otvoreno-more@slobodnadalmacija.hr

Odgovara: dr. sc. Alen Soldo, Centar za studije mora Sveučilišta u Splitu

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Meduze koje su preplavile Prukljansko jezero
Nikolina Vuković Stipaničev/Arhiv/Cropix
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Srđan Vrančić/Arhiv/Cropix Srđan Vrančić/Arhiv/Cropix Nikolina Vuković Stipaničev/Arhiv/Cropix
Srđan Vrančić/Arhiv/Cropix
Cotylorhiza tuberculata je bezopasna za ljude

Nikolina Vuković Stipaničev/Arhiv/Cropix
Meduze koje su preplavile Prukljansko jezero
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StoryEditorOCM

sve ih je više...Još nije jasno što uzrokuje cvjetanje meduza: neke mogu biti opasne za ljude, dr. Alen Soldo savjetuje što učiniti ako dođe do kontakta

Piše Alen Soldo
20. siječnja 2021. - 15:46

U posljednje vrijeme počeo sam primjećivati različite meduze u različito doba godine, pa me zanima koje su opasne i zašto ih uopće toliko ima.

Vedran M., Brač

Meduze su inače stari stanovnici Mediterana i Jadrana, te ih se oduvijek moglo vidjeti u moru, ali ono što se kod njih promijenilo je pojava tzv. cvjetanja meduza, koja se počela događati prvih nekoliko godina ovog stoljeća. Cvjetanje meduza je situacija kad ovi želatinozni organizmi dolaze u priobalne vode u ogromnim količinama i, ovisno o sezoni, uzrokuju različite probleme.

Primjerice, plivači ih baš ne vole, jer poneke od njih mogu biti opasne za zdravlje ljudi, s obzirom na to da im posljedice fizičkog kontakta variraju od slabog peckanja pa sve do ozbiljnih zdravstvenih problema. Nadalje, ribarima...

19. svibanj 2024 10:27