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#population

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John :au: :hb:

#SouthernRightWhale #population growth has stalled, scientists say, with a possible 'onset of a decline'.

Australia's southern right whale population growth has #stalled, raising questions about the recovery of a species that was nearly driven to #extinction by historical #whaling, according to a new study.

abc.net.au/news/2025-05-01/ima

ABC News · Southern right whale population growth has stalled, scientists say, with a possible 'onset of a decline'By Ellen Coulter
Public
CBC Canada

Black bears declined in parts of Ont., new research shows. How that could impact hunting is a bigger question
The black bear population in Ontario has seen significant declines in a few areas of the province, according to a population survey conducted by government researchers, raising concerns about the health of the bears and the impact of hunting them.
#animals #hunting #research #population #Ontario #News
cbc.ca/news/science/ontario-bl

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Bibliolater 📚 📜 🖋

**Threshold fertility for the avoidance of extinction under critical conditions**

“_The results indicate that the fertility rate should exceed 2.7 to avoid extinction. The extinction threshold is reduced by a female-biased sex ratio. We argue that the present results explain the observed phenomena of female-biased births under severe conditions as an effective way to avoid extinction._”

Cuaresma DCN, Ito H, Arima H, Yoshimura J, Morita S, et al. (2025) Threshold fertility for the avoidance of extinction under critical conditions. PLOS ONE 20(4): e0322174. journals.plos.org/plosone/arti.

#OpenAccess #OA #Research #Article #DOI #Fertility #Extinction #Population #Anthropology #Academia #Academics @anthropology

journals.plos.orgThreshold fertility for the avoidance of extinction under critical conditionsThe developed countries now face a low fertility crisis. The replacement level fertility (RLF) is conventionally considered to be 2.1 children per woman, in which demographic stochasticity arising from random variations in individual offspring numbers is ignored. However, the importance of demographic stochasticity casts doubts on the adequacy of the replacement level fertility of 2.1, especially in a small population. Here, we investigate the extinction threshold for the fertility rate of a sexually reproducing population caused by demographic stochasticity. The results indicate that the fertility rate should exceed 2.7 to avoid extinction. The extinction threshold is reduced by a female-biased sex ratio. We argue that the present results explain the observed phenomena of female-biased births under severe conditions as an effective way to avoid extinction. Furthermore, since fertility rates are below this threshold in developed countries, family lineages of almost all individuals are destined to go extinct eventually.
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☮ ♥ ♬ 🧑‍💻

Day 31 cont 🧍‍♀️🧍🧍‍♂️🧍‍♂️🧍‍♀️🧍‍♀️🧍‍♀️🧍🏡

“Already these so-called #greenfield developments — houses built on previously #BareLand, just as the name suggests — are changing the #terrain of #Australia’s #cities.

The new #developments are easy to spot from the street, or the air, thanks to the sea of grey roof tiles.

Where once #ResidentialDevelopment was concentrated around #economic centres, now it’s #bulging outwards to an extent that the connection to city-living is tenuous at best.”

The barely mentioned issue that needs to be addressed, #population and #planning.

#AusPol / #cities / #land / #LandUse <abc.net.au/news/2025-04-30/fed>

ABC News · Caught between a promise and paradise in Australia's housing borderlandsBy Maani Truu
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Universität zu Köln

🌎 An archaeological study of human settlement during the Final Palaeolithic revealed that populations in Europe did not decrease homogenously during the last cold phase of the Ice Age. Significant variation in regional population sizes indicate differentiated reactions nested in an overall shift of settlement areas towards the east

Read more 👇
uni.koeln/TXS74

Study: journals.plos.org/plosone/arti

The map shows population shifts from the south-western to the north-eastern Europe during the last cold phase of the Ice Age. Photo: Isabell Schmidt, University of Cologne
#UniCologne#population#iceage
Public
Bibliolater 📚 📜 🖋

🔴 🌍 **Global gridded population datasets systematically underrepresent rural population**

_“We find large discrepancies between the examined datasets, and, without exception, significant negative biases of −53%, −65%, −67%, −68%, and −84% for WorldPop, GWP, GRUMP, LandScan, and GHS-POP, respectively. This implies that rural population is, even in the most accurate dataset, underestimated by half compared to reported figures.”_

Láng-Ritter, J., Keskinen, M. & Tenkanen, H. Global gridded population datasets systematically underrepresent rural population. Nat Commun 16, 2170 (2025). doi.org/10.1038/s41467-025-569.

#OpenAccess #OA #Article #DOI #Geography #Science #Data #Population #Environment #Academia #Academics @geography @science

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