Umushakashatsi wa LSU inyanja yavumbuye algae yubumara mumazi afunguye
Umushakashatsi wa LSU inyanja yavumbuye algae yubumara mumazi afunguye
Anonim

Sibel Bargu wa LSU, hamwe na Ana Garcia wahoze ari umunyeshuri wahawe impamyabumenyi, bo mu ishami ry’inyanja n’ubumenyi bw’inyanja mu ishuri rya LSU ry’Inyanja n’ibidukikije, bavumbuye algae zifite ubumara mu turere twinshi, twa kure two mu nyanja ifunguye bwa mbere. Ibyavuye mu bushakashatsi biherutse gusohoka mu kinyamakuru kimwe cya siyansi kizwi cyane, Proceedings of the National Academy of Science, cyangwa PNAS.

Indabyo zangiza za algal, cyangwa HABs, bivugwa ko ziyongera haba mubutaka ndetse no mubihe byinshi kuruhande rwinyanja ituwe. Ubushakashatsi bwa Bargu bwerekana ko diatom iboneka hose Pseudo-nitzschia - alga itanga neurotoxine, aside domoic, cyangwa DA, mukarere ka nyanja - mubyukuri nayo itanga DA ahantu henshi muri pasifika ifunguye. Kuba hari ubwo burozi bukomeye ahantu h'amazi maremare biteye impungenge, bitewe nuko mumazi yinyanja, aho ubushakashatsi bwakorewe, DA ishobora kwinjira murwego rwibiryo, bigatuma ihagarikwa ryuburobyi bumwe na bumwe ndetse n’uburozi bw’inyamabere n’inyoni zirisha ku byanduye. amafi. Ikibazo gihangayikishije cyane, ni uko kongeramo ibyuma mu mazi yo mu nyanja - imwe mu ngamba zikunze gutangwa mu kugabanya ubushyuhe bw’isi - bigaragara ko ubu bishobora kuvamo uburabyo bw’ubumara mu nyanja.

Kubera ko ibyuma byongewemo nubukorikori byongewe mumazi yinyanja bishobora kuvamo phytoplankton kumera ahantu hanini hinyanja ibura ibyuma, kandi nanone kubera ko phytoplankton ifata dioxyde de carbone hamwe nicyuma usibye amazi yinyanja, byavuzwe ko ari a umuti wo kurwanya ubushyuhe bwisi. Ahanini, imikurire mishya yingirabuzimafatizo ikurura dioxyde de carbone mu nyanja, bikagabanya ubwinshi bwa gaze mu kirere bityo bikagabanya ingaruka zayo zo gushyuha. Nyamara, selile zimeze nka Pseudo-nitzschia zimaze igihe zizwiho kuba abantu benshi mubushakashatsi bwakozwe bwo gufumbira ibyuma byakorewe mu nyanja mumyaka irenga icumi.

Kugira ngo ikibazo cya neurotoxine DA gishoboke mu turere aho Pseudo-nitzschia ibera mu nyanja ifunguye, Bargu ndetse n'umwe mu banditsi b'impapuro, Mary Silver wo muri kaminuza ya Californiya, Santa Cruz, cyangwa UCSC, yashakishije inkunga mu 2007 kuva muri National Science Foundation gushakisha abakora uburozi mu nyanja. Binjiye muri Ken Bruland, umwarimu w’ubumenyi bw’inyanja muri UCSC, mu rugendo rw’ubushakashatsi rwo kwiga chimie fer mu mazi yo mu nyanja ya Alaska. Muri uru rugendo, bakusanyije amazi y’amazi basanga algae nuburozi bwayo hafi y’ibidukikije byo mu nyanja hafi ya byose mu karere. Ibi byatumye basuzuma ibyakera, bibitswe kubindi bibanza bikikije pasifika, hanyuma bongera kubona uburozi mubitegererezo byinshi.

Hanyuma, babifashijwemo na Kenneth Coale, umuyobozi wa laboratoire ya Moss Landing Marine akaba n'umushakashatsi mukuru ku ngendo nyinshi zakoze ubushakashatsi bwo gutunganya ibyuma bya kera muri pasifika, bakuyemo ingero basanga Pseudo-nitzschia ndetse n'uburozi bwinshi. Ubushakashatsi bwabo bwerekana ko gukungahaza ibyuma bitera uburozi bwinshi mu nyanja ifunguye, rimwe na rimwe bikagera nko mu turere two ku nkombe, aho usanga impfu z’inyoni n’inyamabere. Abanditsi b'uru rupapuro rwa PNAS bavuze kandi ko gukungahaza ibyuma bishobora kubaho mu buryo busanzwe, byerekana ko uburozi bwinshi bushobora no kuba bwarabaye igihe icyuma cyongerwaga n'umukungugu uhuhwa n'umuyaga hamwe n'ibindi bihe ndetse na geologiya.

Bargu, ushinzwe iperereza ry’ibanze ku kigobe cya Alaska phytoplankton, yari ashinzwe kumenya amoko yose ya Pseudo-nitzschia no gupima uburozi muri uwo mushinga. Usibye Bargu n'uwahoze ari umunyeshuri wahawe impamyabumenyi Garcia, abanditsi b'impapuro za PNAS barimo Silver, Coale, Ken Bruland, Susan Coale na Kathryn Roberts muri UCSC; na Claudia Benitez-Nelson na Emily Sekula-Wood muri kaminuza ya Caroline yepfo. Ubu bushakashatsi bwatewe inkunga na National Science Foundation, Ishami ry’ingufu muri Amerika hamwe n’ibiro by’ubushakashatsi bw’amato muri Amerika.

Ingaruka zituruka kuri HABs nazo zagiye zishishikazwa n'akarere mu kigobe cya majyaruguru ya Mexico. Mu ngaruka nyinshi za HAB muri kano karere, izatewe nuburabyo bwinyanja bwubwoko bwa diatoms Pseudo-nitzschia hamwe na DA bifitanye isano birahangayikishije cyane. Ubushakashatsi bwakozwe ku mazi yo ku nkombe za Louisiana no ku nkombe za estuarine bwerekanye ko habaho uburozi bwa Pseudo-nitzschia, akenshi bukaba butera uburabyo buri mwaka hagaragara amashurwe arenga miriyoni zifite uburozi kuri litiro. Ibitekerezo byubu byerekana impinga yumwaka muri Pseudo-nitzschia birashoboka ko ibaho mugihe cyumwuzure wimpeshyi yumugezi wa Mississippi.

Ubushakashatsi bukomeje gukorwa na laboratoire ya Bargu burimo kwiga urugero rwa Pseudo-nitzschia nuburozi bwayo, ugasanga Pseudo-nitzschia itanga DA ikunze kuboneka mumazi ya Louisiana hafi yinkombe no ku nkombe. Itsinda rye ry’ubushakashatsi rimaze kubona urugero rwa DA mu mazi ndetse no ku rugero ruciriritse muri gulf menhaden kuva Terrebone Bay, La., Uburobyi bwa kabiri muri Amerika.

Bargu yiga byumwihariko ingaruka zibi bibabi kurubuga rwibiribwa, agerageza kumva neza ingaruka imikurire nkiyi ishobora kugira kurwego rukurikira urwego rwibiryo. Avuga ko ubu ari ngombwa kumva urugero rw’uburozi bwa algal muri ako gace n'impamvu zibitera.

Ati: "Urebye ko dushingiye ku nganda zo mu nyanja hano, ni ngombwa kumenya hanyuma tukagabanya ibitera uburabyo bwa algal." Ati: "Gusa mu gukurikirana no gukemura ibitera uburabyo ni bwo dushobora kurinda uburobyi bwacu ndetse n'abantu babeshaho."

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