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Burung kuno berkembang dengan adaptasi spesialis menyelam
Date:
May 22, 2015
Source:
Taylor & Francis
Summary:
Sebuah studi baru dari beberapa burung primitif dari masa cretaceous menunjukkan bagaimana beberapa garis keturunan terpisah berevolusi adaptasi untuk menyelam . Hidup pada saat yang sama dengan dinosaurus , fosil burung Hesperornithiform telah ditemukan di Amerika Utara , Eropa dan Asia dalam batuan berumur 65-95000000 tahun . Penelitian ini menunjukkan bahwa garis keturunan terpisah membuat menjadi semakin lebih mahir menyelam ke dalam air untuk menangkap ikan , .....read more
Go fish! Ancient birds evolved
specialist diving adaptations
Date:
May 22, 2015
Source:
Taylor & Francis
Summary:
A new study of some primitive birds from the Cretaceous shows how several
separate lineages evolved adaptations for diving. Living at the same time as
the dinosaurs, Hesperornithiform bird fossils have been found in North America,
Europe and Asia in rocks 65-95 million years old. This research shows that
separate lineages became progressively more adept at diving into water to catch
fishes, like modern day loons and grebes.
..............................
A new study of some primitive birds from the Cretaceous shows how several
separate lineages evolved adaptations for diving.
Living at the same time as the dinosaurs, Hesperornithiform bird fossils
have been found in North America, Europe and Asia in rocks 65-95 million years
old. Dr Alyssa Bell and Professor Luis Chiappe of the Dinosaur Institute,
Natural History Museum of Los Angeles County, publishing in the Journal
of Systematic Palaeontology, have undertaken a detailed analysis of their
evolution, showing that separate lineages became progressively more adept at
diving into water to catch fishes, like modern day loons and grebes.
The Hesperornithiformes are a highly derived but very understudied group of
primitive birds from the Cretaceous period. This study is the first
comprehensive phylogenetic analysis, or evaluation of evolutionary
relationships, to ever be undertaken on the entire group.
The results of this study confirm that the Hesperornithiformes do form a
single group (or clade), but that within this group the inter-relationships of
the different taxa are more complex than previously thought. Additionally, this
study finds that anatomical changes were accompanied by enlargement in overall
body size, which increased lung capacity and allowed deeper diving.
Overall, this study provides evidence for understanding the evolution of
diving adaptations among the earliest known aquatic birds.
Story Source:
The above story is based on materials provided
by Taylor & Francis. Note: Materials may be edited
for content and length.
Journal Reference:
1.
Alyssa Bell, Luis M. Chiappe. A species-level phylogeny of the
Cretaceous Hesperornithiformes (Aves: Ornithuromorpha): implications for body
size evolution amongst the earliest diving birds. Journal of
Systematic Palaeontology, 2015; 1 DOI:10.1080/14772019.2015.1036141