• Welcome to TONMO, the premier cephalopod interest community, and birthplace of #WorldOctopusDay and #CephalopodAwarenessDays. Founded in 2000, we are a large community of experts, hobbyists and enthusiasts, some of whom come together when we host our biennial conference. To join in on the fun, sign up. You can also become a Supporter for just $50/year to remove all ads and enjoy other perks. Follow us on Twitter for more cephy goodness.

Cephalopods drove the evolution of whale sonar?

Steve O'Shea

TONMO Supporter
Registered
Joined
Nov 19, 2002
Messages
4,671
"According to Lindberg, whale biologists had various theories about echolocation, including that whales developed this biosonar soon after entering the water as a way to find food in turbid rivers and estuaries. The evolution of toothed whales, however, indicates otherwise. Whales first occupied the ocean, and only later invaded rivers. Other experts have proposed that development of echolocation coincided with global cooling around 33.5 million years ago, though a mechanism was not specified."

.... what evidence have we for estuarine fossil cephs? We don't have them today, so one might think that development of echolation during some transition from land to estuarine/river conditions didn't occur in order to locate cephalopods (perhaps some other food resource, like crabs and fish, and only later for cephalopods, following a transition from estuarine to oceanic habitat). The second scenario certainly sounds more plausible, if cephalopods were the driving force behind biosonar development.

Good find Phil; ta.
 

Forum statistics

Threads
20,880
Messages
206,843
Members
8,471
Latest member
CarlServi

Monty Awards

TONMOCON IV (2011): Terri
TONMOCON V (2013): Jean
TONMOCON VI (2015): Taollan
TONMOCON VII (2018): ekocak


Top