Ƙayyade adadin yara na iya ƙara arziki amma yana rage nasarar juyin halitta.
Babban abin lura shi ne cewa mutanen kasashen da suka ci gaba suna da karancin yara. Wannan ya saba wa abin da ake tsammani domin samun ƙarin albarkatu yana nufin cewa mutane na iya haifuwa da yawa. Duk da haka, karuwar arziki sau da yawa yana haifar da ƙananan ƙimar haihuwa tare da mutane da gangan suna ƙoƙarin samar da ƙasa kaɗan, al'amarin da aka sani da "sauyin alƙaluma." A ƙasashe masu tasowa, duk da haka, samun babban kuɗin shiga yana haifar da yawan iyali.
An gabatar da hasashe na "daidaitacce" don bayyana abin da ya faru na canjin alƙaluma. A cewar ka'idar, samun ƙarancin haihuwa da kuma adana dukiya a zahiri yana haɓaka juyin halitta saboda tsararraki masu zuwa za su iya haifar da ƙarin yara idan aka yi la'akari da nasarar tattalin arzikinsu.
Don binciken, masu bincike sun yi nazarin mutane 14, 000 da aka haifa a Sweden a cikin shekarun 1900 kuma ana bin zuriyarsu a ƙarƙashin Nazarin Ƙungiyar Haihuwa ta Multigenerational na Uppsala.
Binciken da aka yi a yanzu ya gano cewa nasarar da aka samu na zamantakewar al'umma yana nuna ci gaba har zuwa tsararraki hudu, amma ya rage yawan yara a cikin tsararraki masu zuwa. Zaɓin samun ƙananan yara shine dabarun tattalin arziki kuma baya amfanar juyin halitta.
Binciken ya nuna cewa matakin ilimi na mutum da kudin shiga ya shafi ilimi da matakan samun kudin shiga ba kawai 'ya'yansa da jikoki ba har ma da manyan jikoki, a cewar Farfesa Ilona Koupil, daga Cibiyar Nazarin Lafiya ta Lafiya (Jami'ar Stockholm/Karolinska Institutet).).
Masu bincike sun tantance nasarar zamantakewar kowane tsara ta hanyar nazarin bayanan makaranta, adadin digiri na kwaleji da nasarar juyin halitta ta shekaru a aure da adadin yara.
An gano cewa ƙananan iyalai sun nuna cewa iyayen suna da wadata. Yara a cikin waɗannan iyalai sun yi kyau a makaranta, sun sami digiri na kwaleji kuma suna ba da dukiyar iyali ga tsara na gaba. Duk da fa'idar, an sami ƙarancin zuriya, sabanin ka'idar "daidaitacce" da masu bincike suka fitar.
"A karkashin zabin dabi'a, kuna tsammanin kwayoyin halitta za su yi amfani da albarkatun su don samar da zuriyar halittu masu yawa, don haka su kara dacewa da Darwiniyanci. Canjin yanayin al'umma abu ne mai wuyar warwarewa domin da farko ba a ganin mutane suna yin haka," in ji gubar. marubuci Dr. Anna Goodman, Research Fellow a London School of Hygiene & Tropical Medicine.
Goodman ya kara da cewa kara yawan yara yana nufin cewa yaran ba za su iya haifuwa ba ko kuma yawansu zai haifar da rashin inganci. Masu bincike sun gano wannan gaskiya ne a matsayin zamantakewar zamantakewar al'ummomi masu zuwa ba a cikin nasarar iliminsu ba.
"Daya daga cikin binciken da muka samu shi ne cewa kasancewa daga gida mai arziki da farko yana sa amfanin kananan iyali ya fi girma. al’amuran al’umma, maimakon saka hannun jari da gado daga iyaye, wanda ke da karanci,” in ji Co-marubucin Dokta David Lawson, daga Sashen Nazarin Anthropology a UCL.
An buga binciken a cikin mujallar Proceedings of the Royal Society B: Kimiyyar Halittu.
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