Ukusinda kwiMinyaka yezigidi ezingama-500 kwaye Unyamalale ngokuqhwanyaza kweliso: Ibali leChambered Nautilus.

Ngu: Gregory Jeff Barord, uMfundi wePhD, kwiDyunivesithi yesiXeko saseNew York-iZiko lesiDanga, kwiDyunivesithi yesiXeko saseNew York-kwiKholeji yaseBrooklyn

Usuku 1: Ekugqibeleni sifikile kwiiPhilippines ezinzulwini zobusuku emva kweeyure ezingama-24 zokubhabha ukusuka kwisiXeko saseNew York, kunye ne-lavever eSouth Korea, kwaye ekugqibeleni saya eCebu, ePhilippine. Ngethamsanqa, ugxa wethu wasePhilippines usilindile ngaphandle kwesikhululo seenqwelomoya ngoncumo olukhulu kunye neveni enkulu ukuba isise ehotele yethu. Luhlobo loncumo oluhlala lukwenza ujonge kwicala eliqaqambileyo lezinto kwaye luya kungqina imfuneko kolu hambo kwaye kwiinyanga ezili-16 ezizayo. Emva kokulayisha iingxowa ze-13 zemithwalo kwilori, siya ehotele kwaye siqale ukucwangcisa uphando. Ngeentsuku ezili-17 ezizayo siza kuqokelela idatha yokuvavanya ubungakanani babemi be-nautilus kufuphi neSiqithi saseBohol kumbindi wePhilippine.

Umnombo we-nautilus, okanye umthi wosapho, sele ukhona malunga ne-500 yezigidi zeminyaka. Xa kuthelekiswa, ookrebe bebekho malunga nezigidi ezingama-350 zeminyaka, izilwanyana ezanyisayo iminyaka eyi-225 yezigidi, kwaye abantu banamhlanje bebekho iminyaka engama-200,000 kuphela. Kule minyaka zizigidi ezingama-500, inkangeleko esisiseko yee-nautilus ayikatshintshi kakhulu kwaye ngenxa yesi sizathu, ii-nautilus zisoloko zibizwa ngokuba “ziifosili eziphilayo” kuba ii-nautilus eziphilayo kulwandle lwanamhlanje zikhangeleka zifana kakhulu nezinyanya zazo. IiNautilus zangqina kuninzi lobomi obutsha obuye bavela kwesi sijikelezi-langa kwaye basinda kuko konke ukutshabalala kwenyambalala okwatshayela ezinye izilwanyana ezininzi.

Iinautilus zinxulumene neengwane, isquid, kunye ne-cuttlefish; kunye, ezi zilwanyana zonke zenza Class Cephalopoda. Uninzi lwethu luqhelene nengwane kunye neskwidi ngenxa yezakhono zabo ezimangalisayo zokutshintsha umbala kunye nokuziphatha okukrelekrele. Nangona kunjalo, ii-nautilus azikwazi ukutshintsha umbala kwaye zijongwe njengezingenangqondo xa zithelekiswa nezihlobo zabo ze-octopus. (Nangona, umsebenzi wamva nje uqala ukutshintsha loo ndlela yokucinga). Iinautilus nazo zahlukile kwezinye iicephalopods kuba zineqokobhe langaphandle, elinemigca ngelixa zonke ezinye iicephalopods eziphilayo zineqokobhe langaphakathi okanye azinaqokobhe kwaphela. Ngelixa eli qokobhe lomelele, linemigca linceda ukulawula ukunyakama kwaye libonelela ngokhuseleko, likwayinto exatyisiweyo.

SikwiiPhilippines kuba nangona ii-nautilus zisinde kwizigidi zeminyaka, abantu bazo babonakala behla ngenxa yoxinzelelo olungalawulwayo lokuloba. Amashishini okuloba aseNautilus agqabhuka ngeminyaka yoo-1970 ngenxa yokuba iqokobhe labo laba yinto exatyiswe kakhulu ekurhwebeni kwaye yathunyelwa kwaye yathengiswa kwihlabathi liphela. Iqokobhe lithengiswa njengoko linjalo kodwa likwaphulwe phantsi kwaye lenziwe kwezinye izinto ezinjengamaqhosha, imihombiso, kunye nobucwebe. Ngelishwa, bekungekho migaqo ibekiweyo yokubeka iliso ukuba zingaphi iinautilus ezibanjiweyo. Ngenxa yoko, uninzi lwabemi be-nautiluses bawa kwaye abasaxhasi ukuloba ngoko ke umlobi kuye kwafuneka afudukele kwindawo entsha. Lo mjikelo uye waqhubeka kwiindawo ezininzi kule minyaka ingama-40 idluleyo.

Kutheni bekungekho mimiselo? Kwakutheni ukuze kungabikho longameli? Kutheni amaqela olondolozo engasebenzi? Impendulo ephambili kule mibuzo neminye yeyokuba bekungekho datha yenzululwazi malunga nobungakanani benani labemi be-nautilus kunye nefuthe lezokuloba. Ngaphandle kwedatha, akunakwenzeka ukwenza nantoni na. Ngo-2010, i-United States Fish and Wildlife Service yaxhasa ngemali iprojekthi eyayiza kumisela, kube kanye, ukuba yeyiphi isiphumo esibe naso iminyaka engama-40 yokuloba okungalawulwayo kuluntu lwenautilus. Inyathelo lokuqala kule projekthi yayikukuhamba uye kwiiPhilippines kwaye kuhlolwe abantu be-nautilus kuloo ndawo kusetyenziswa imigibe.

Usuku 4: Iqela lethu ekugqibeleni liye lafika kwindawo yethu yophando kwiSiqithi saseBohol emva kokuhamba ngeyure ye-3 ngesikhephe, kunye nemithwalo engaphezulu, ukusuka eCebu ukuya eBohol. Siza kuba lapha kwezi veki zimbini zizayo sizama ukuqokelela idatha malunga nobungakanani benani labemi be-nautilus e-Bohol.

Hlala ubukele ibhlog elandelayo malunga nolu hambo kunye nophando!

Ubomi: UGregory Jeff Barord ngoku ungumfundi wePhD kwisiXeko saseNew York kwaye uphanda ngezakhono zokufunda kunye nenkumbulo ye-nautiluses kunye nokuqhuba uphando olusekwe kulondolozo kubungakanani babemi. UGregory uqhube uphando nge-cephalopod iminyaka engaphezu kwe-10 kwaye usebenze kwiinqanawa zokurhweba ngokuloba kuLwandle lwaseBering njengoMboni wezokuLoba kwi-Fisheries Observer ebeka esweni izabelo zeNational Marine Fisheries Service. 

links:
www.tonmo.com
http://www.nytimes.com/2011/10/25/science/25nautilus.html?_r=3&pagewanted=1&emc=eta1&