JHE: A fish is not a fish: Aquatic food in hominin evolution

Discussions about Waterside Hypotheses of Human Evolution or any other topic related to human evolution.

Moderator: CEngelbrecht

JHE: A fish is not a fish: Aquatic food in hominin evolution

Postby CEngelbrecht » Wed Oct 08, 2014 10:12 pm

Journal of Human Evolution (impact factor: 4.09). 01/2014; doi: 10.1016/j.jhevol.2014.04.004
http://www.researchgate.net/publication ... _evolution

Abstract: From c. 2 ma (millions of years ago) onwards, hominin brain size and cognition increased in an unprecedented fashion. The exploitation of high-quality food resources, notably from aquatic ecosystems, may have been a facilitator or driver of this phenomenon. The aim of this study is to contribute to the ongoing debate on the possible role of aquatic resources in hominin evolution by providing a more detailed nutritional context. So far, the debate has focused on the relative importance of terrestrial versus aquatic resources while no distinction has been made between different types of aquatic resources. Here we show that Indian Ocean reef fish and Eastern African lake fish yield on average similarly high amounts of eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and arachidonic acid (AA). Hence a shift from exploiting tropical marine to freshwater ecosystems (or vice versa) would entail no material difference in dietary long-chain polyunsaturated fatty acid (LC-PUFA) availability. However, a shift to marine ecosystems would likely mean a major increase in access to brain-selective micronutrients such as iodine. Fatty fish from marine temperate/cold waters yield twice as much DHA and four times as much EPA as tropical fish, demonstrating that a latitudinal shift in exploitation of african coastal ecosystems could constitute a significant difference in LC-PUFA availability with possible implications for brain development and functioning. We conclude that exploitation of aquatic food resources could have facilitated the initial moderate hominin brain increase as observed in fossils dated to c. 2 ma, but not the exceptional brain increase in later stages of hominin evolution. We propose that the significant expansion in hominin brain size and cognition later on may have been aided by strong directional selecting forces such as runaway sexual selection of intelligence, and nutritionally supported by exploitation of high-quality food resources in stable and productive aquatic ecosystems.


FINALLY!!!
User avatar
CEngelbrecht
 
Posts: 127
Joined: Sun Oct 30, 2011 11:10 pm
Location: Scania, Sweden

Re: JHE: A fish is not a fish: Aquatic food in hominin evolu

Postby CEngelbrecht » Sun Oct 19, 2014 8:28 am

User avatar
CEngelbrecht
 
Posts: 127
Joined: Sun Oct 30, 2011 11:10 pm
Location: Scania, Sweden

Re: JHE: A fish is not a fish: Aquatic food in hominin evolu

Postby AlgisKuliukas » Fri Oct 31, 2014 10:23 am

Thanks for posting, Chris.
I've re-posted in the peer-reviewed paper section, just for consistency.

viewtopic.php?f=11&t=369#p1136

Good paper, as usual!

Algis
Waterside hypotheses of human evolution assert that selection from wading, swimming and diving and procurement of food from aquatic habitats have significantly affected the evolution of the lineage leading to Homo sapiens as distinct from that leading to Pan. (p118)
Kuliukas, A., Morgan, E. (2011). Aquatic scenarios in the thinking on human evolution: What are they and how do they compare?. In: Vaneechoutte, M., Verhaegen, M., Kuliukas, A. (2011). Was Man More Aquatic in the Past?
User avatar
AlgisKuliukas
 
Posts: 443
Joined: Wed Oct 26, 2011 10:24 pm


Return to General Discussion

Who is online

Users browsing this forum: No registered users and 2 guests

cron