Nsomba zazikulu zoyera kuzungulira chilumba cha Guadalupe ku Mexico nthawi zina zimacheza wina ndi mzake - ndipo ngakhale kuti si mpikisano wotchuka, ena akhoza kungokhala ochezeka kwambiri kuposa ena onse.
Wasayansi wapamadzi ku Florida International University (FIU) Yannis Papastamatiou ndi gulu logwirizana la ofufuza akufuna kuwulula zinsinsi zina za shaki zoyera zomwe zimasonkhana nyengo kuzungulira chilumba cha Guadalupe. Anapeza kuti shaki zimakonda kumamatirana polondera chakudya.
"Mayanjano ambiri anali aafupi, koma panali shaki pomwe tidapeza mayanjano otalikirapo, nthawi zambiri amakhala mayanjano," adatero Papastamatiou, wolemba wamkulu wa kafukufukuyu. "Mphindi makumi asanu ndi awiri ndi nthawi yayitali yosambira ndi shaki ina yoyera."
Kaŵirikaŵiri, kuphunzira nyama zosadziŵika bwino ngati zimenezi kumaphatikizapo kachipangizo kodziwirako. Komabe, kuti aphunzire za shaki zoyera, ochita kafukufukuwo adafunikira chizindikiro chabwinoko. Adaphatikiza ukadaulo wosiyanasiyana wopezeka pazamalonda kukhala "super social tag" yokhala ndi kamera ya kanema komanso masensa angapo omwe amatsata kuthamanga, kuya, mayendedwe ndi zina zambiri. Chomwe chinayika "zachitukuko" mu tag iyi chinali zolandila zapadera zomwe zimatha kuzindikira shaki zina zomwe zili pafupi.
Nsomba zina zodziwika bwino za shakizi zinali zotsatira za ntchito yam'mbuyomu yomwe wolemba nawo kafukufukuyu Mauricio Hoyos-Padilla adachita kuti azitsata mayendedwe a shaki zoyera kuzungulira chilumba cha Guadalupe. Pafupifupi 30 mpaka 37 a shakiwo adawonekera pama tag ena apamwamba kwambiri a shaki zoyera.
Nsomba zoyera zisanu ndi chimodzi pazaka zinayi zidayikidwa chizindikiro. Zambiri zikuwonetsa kuti amakonda kukhala m'magulu omwe ali ndi amuna kapena akazi okhaokha.
Ngati shakizo zinali zofanana ndi zina zilizonse, zinali zachilendo kwambiri. Nsomba imodzi yomwe idasunga chikwangwani chake kwa maola 30 okha inali ndi mayanjano apamwamba kwambiri - shaki 12. Sharki wina anali ndi chizindikiro kwa masiku asanu, koma amangokhala ndi shaki zina ziwiri.
Anasonyezanso njira zosiyanasiyana zosaka nyama. Ena anali okangalika m’madzi osaya, ena akuya kwambiri. Ena anali okangalika masana, ena usiku.
Vuto la kusaka lidawonekera muvidiyoyi. Choyera chachikulu chinatsatira kamba. Kenako Kambayo anaona ndipo anathawa. Choyera chachikulu chinatsatira chisindikizo. Chisindikizocho chinachiwona, chinavina mozungulira shakiyo ndikuthawa. Papastamatiou akuwonetsa kuti izi si shaki zoyera zokha, chifukwa adani sapambana nthawi zambiri.
Ndicho chifukwa chake kupanga mayanjano ochezera kungakhale kofunika kwambiri. Papastamatiou adaphunzira za moyo wamagulu amitundu ina ya shaki ndipo adawona kulumikizana pakati pa chikhalidwe cha anthu ndi kuthekera kopezerapo mwayi pakusaka bwino kwa nsomba zina. N’kutheka kuti zimenezi zikuchitikanso pachilumba cha Guadalupe.
"Tekinoloje tsopano ikhoza kutsegula moyo wachinsinsi wa nyama izi," adatero Papastamatiou.
ZOMWE MUNGACHITE PA NKHANIYI:
- Florida International University (FIU) marine scientist Yannis Papastamatiou and a collaborative team of researchers wanted to uncover some of the mysteries of the white sharks that gather seasonally around Guadalupe Island.
- Papastamatiou has studied the social lives of other shark species and noticed a link between sociality and the ability to take advantage of another shark’s hunting success.
- Those other tagged sharks were the result of previous work the study’s co-author Mauricio Hoyos-Padilla had done to track movements of white sharks around Guadalupe Island.
