Tag

Biogeography

All articles tagged with #biogeography

science1 month ago•7 min saved

Tiny alvarezsaurid upends the dinosaur miniaturization narrative

A newly described Alnashetri cerropoliciensis from Argentina weighs about 700 g and challenges the idea that Alvarezsaurid miniaturization evolved linearly from ant-eating; it’s a small, early-branching predator with relatively long forelimbs, suggesting tiny body size evolved multiple times and across a broader geographic range than previously thought, implying a Pangaea-wide distribution with later fragmentation shaping their Late Cretaceous distribution. Researchers plan CT scans of the specimen and have found hints of another Alvarezsaur in the region to help illuminate the next evolutionary steps.

via Ars Technica|

#alvarezsaurids #biogeography #dinosaurs

science1 month ago•5 min saved

New Brazilian Sauropod Fossil Traces European Origins of South American Dinosaurs

Paleontologists in northeastern Brazil describe a 120-million-year-old sauropod, Dasosaurus tocantinensis, from the Itapecuru Formation. The partial skeleton reveals unique features and suggests the species is closely related to European dinosaurs, implying a migration route from Europe to South America via northern Africa during the Early Cretaceous. This finding challenges views of South America as isolated and expands understanding of Early Cretaceous sauropod diversity and intercontinental connections within Gondwana and Europe.

via Indian Defence Review|

#biogeography #dasosaurus-tocantinensis #early-cretaceous

science2 months ago•13 min saved

Ancient Collisions Carved the Wallace Line, Explaining a Biodiversity Boundary

A computer-model study links the Wallace Line to a 35-million-year-old continental collision and subsequent climate swings, explaining why Bali’s Asian fauna abruptly shifts to Australian forms on Lombok and nearby islands—and how tectonics and climate history have shaped biodiversity across the region, with nearby lines like Weber’s and Lydekker’s also noted as regional boundaries.

via ZME Science|

#australia-asia-fauna #biogeography #paleoclimatology

science2 months ago•4 min saved

New Study Reframes the End of Dinosaurs: Thriving, Not Fading

A Science study finds dinosaurs were flourishing in diverse ecosystems up to the 66-million-year asteroid impact, overturning the idea of a slow pre-extinction decline; fossil evidence from New Mexico and elsewhere shows regional bioprovinces and thriving dinosaur communities, with mammals later rebounding while geographic patterns persisted into the Paleocene.

via Indian Defence Review|

#asteroid-impact #biogeography #dinosaurs

science3 months ago•3 min saved

Revolutionary Fossil Challenges Evolutionary History

The discovery of the fossil Telmatomyia talbragarica in Australia challenges previous beliefs that certain freshwater midges originated in Laurasia, suggesting instead a Gondwanan origin and providing new insights into insect evolution and the breakup of Gondwana.

via Indian Defence Review|

#biogeography #evolution #fossil

science5 months ago•2 min saved

Baby Sea Snail Fossil Found Inside Mother’s Shell

Researchers in Taiwan discovered the first fossils of five freshwater mollusk species from the Early Pleistocene, including rare evidence of a juvenile snail shell inside its mother's shell, indicating ancient live birth behavior. This finding sheds light on the early biogeography and reproductive strategies of freshwater snails in East Asia, highlighting Taiwan's role as a migratory corridor during glacial periods and providing crucial insights into the evolution of freshwater biodiversity.

via Phys.org|

#biogeography #fossil-discovery #freshwater-mollusks

science8 months ago•3 min saved

Tiny Fossil's Discovery Challenges Scientific Understanding

A 16-million-year-old fossil of a tiny dirt ant from Dominican amber has challenged previous beliefs by showing that the Basiceros ant lineage once lived in the Caribbean, indicating a more complex evolutionary history and biogeographic distribution than previously thought. The discovery also suggests that these ants nearly doubled in size over 20 million years and highlights their advanced survival strategies, despite their eventual extinction due to environmental changes and competition.

via The Daily Galaxy|

#ant #biogeography #dominican-amber

science8 months ago•3 min saved

Fossil Evidence Shows Early Primates Originated in Cold Climates

Fossil and statistical modeling research shows that early primates evolved in cold, seasonal climates in North America around 66 million years ago, challenging the previous belief that they originated in tropical forests, and suggesting they migrated to warmer environments over time.

via Phys.org|

#biogeography #cold-climates #evolution

science8 months ago•3 min saved

Scientists Discover an Ocean Barrier That Jellyfish Avoid

Scientists discovered a mysterious, semi-permeable barrier in the North Atlantic that separates two morphotypes of jellyfish, despite their genetic similarity, suggesting an unknown deep-sea biogeographic boundary that influences species distribution in the Arctic and sub-Arctic regions.

via ScienceAlert|

#biogeography #deep-sea #jellyfish

science9 months ago•3 min saved

Scientists Confirm a Universal Rule Governing All Life on Earth

A new study provides empirical evidence that all life on Earth follows a 'core-to-transition' organization, where most species originate from biodiversity-rich core regions and expand outward, with environmental factors like heat and drought influencing their spread, offering insights into biodiversity patterns and responses to climate change.

via Yahoo|

#biodiversity #biogeography #climate-change

science9 months ago•3 min saved

Scientists Uncover a Universal Rule Governing All Life on Earth

Scientists from Umeå University have discovered a universal pattern in how species cluster in core areas within biogeographical zones and expand outward, revealing a fundamental rule that shapes Earth's biodiversity and has significant implications for conservation and climate change strategies.

via Indian Defence Review|

#biodiversity #biogeography #climate-change

science2 years ago•2 min saved

Unveiling the Global Phenomenon of Fairy Circles: New Atlas Reveals Surprising Discoveries

A new study has published the most comprehensive atlas of "fairy circles" to date, documenting 263 new sites in 15 countries across three continents, but sadly none have been officially documented in North America. Fairy circles are patterns of bare soil surrounded by circular vegetation patches that have fascinated scientists for years. The study provides insights into the ecology and biogeography of these patterns and reveals that they are more common than previously thought. The circles are found in arid regions with specific soil and climatic conditions, and the presence of termite nests also plays a role. The study used artificial intelligence-based models and satellite images to discover new locations with similar patterns.

via USA TODAY|

#biogeography #ecology #fairy-circles

science2 years ago•6 min saved

Ancient Plant Fossils Unveil South America-to-Asia Escape Route

Fossil evidence from Argentina suggests that a group of plants from the spurge family, known for economically valuable species like rubber trees and poinsettias, migrated from ancient South America to Australia, Asia, and parts of Africa. The findings challenge the prevailing idea that the spurge family's Macaranga-Mallotus clade evolved in Asia, instead suggesting that it may have originated in Gondwanan South America before spreading globally. The fossils, dating back 52 million years, provide the first direct evidence of spurges in Gondwanan South America and highlight the plants' ability to adapt to different environments over time. The study serves as a reminder of the resilience of the natural world and the need to address deforestation and environmental changes.

via Phys.org|

#biogeography #climate-change #fossil-evidence