ML138452
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Subject 1: (Interview). Subtitle: Tony Coates, Jeremy Jackson. Timecode In: 00:02:00. Timecode out: 00:09:58. Notes: Geology; Paleoecology; Recorded 26 of March, 1995. Subject 2: (Environmental Recording). Subtitle: Village ambi. Timecode In: 00:12:46. Timecode out: 00:26:00. Notes: Time of Day: 0620; Geology; Paleoecology. Subject 3: (Interview). Subtitle: Tony Coates, Jeremy Jackson. Timecode In: 00:37:58. Timecode out: 01:00:05. Notes: Geology; Paleoecology. Subject 4: (Environmental Recording). Subtitle: Quiet river ambi. Timecode In: 01:02:01. Timecode out: 01:04:12. Habitat: River. Equipment Notes: Stereo=1; Decoded MS stereo; Sennheiser MKH40 Cardioid Mid Mic and MKH30 Bidirectional Side Mic. NPR/National Geographic RADIO EXPEDITIONS Panama - Dar1en DAT #6 -AX 41:49 -58:40 AC: Could I ask you again about biodiversity and the Isthmus? and the things that bring you to this river. *JJ: What we are trying to see is how the diversity of shallow marine environments in tropical America changed through time, knowing in advance that there is at least one major event that must have disturbed the general pattern and that's the separation of what was once one continuous and probably fairly environmentally homogenous system into two rather different systems. Here we are actually looking at material that was deposited in a channel -in a sea passage between the islands that were forming, the isthmus, that eventually became Pacific, but really at that time they were neither Pacific or Atlantic, but isthmian archipelago deposits...So, what we are looking to see is how that fauna changed, how diversity changed, how the nature of the organisms changed through time...Our primary focus in the beginning was to say that the pivotal event must have bee the formation of the barrier... Indeed the barrier did have a very significant effect in isolating the biotas, and contributing to environmental differences on either side with an increase in the total number of species, because there were now two oceans instead of one...Aside from that the -at least in many groups of organisms -the changes were not as great as we expected, and the real surprise in our work was the discovery that the most dramatic changes we preserved were rather quick and post-dated the final closure of the isthmus by at least one million years. So one the one hand it's gone as expected if some what less of a change than anticipated, on the other hand, very much a surprise. These units are very important for what we are trying to do, because they document the nature of the biota that was living around this archipelago that was slowly developing into a barrier, and therefore represent a genuinely isthmian fauna, that presumably should have been more or less the same, be it on the Caribbean or the Pacific side of this chain of islands much like the Aleutian Arc, or the whole -the Lesser Antilles, or the Indonesian Archipelago -a string of islands with good marine communication across them but clearly a developing barrier. JJ 45:08 So what we - if we were in slightly younger material than we would expect to say it has a more Pacific signature or a more Caribbean signature. But this material is probably old enough that it would simply have a isthmian signature, and it wouldn't make much difference whether you were on the Caribbean or the Pacific side, and ... up in Bocus del Toro, in the western end of Panama, where we know a lot more what we are talking about than here where we are still groping, that's indeed true, the faunas from the late Miocene, roughly 5 -7 million years ago, even into the early Pliocene just after that are really quite similar on opposite sides. Although there's already signs of divergence. You get into the late Pliocene 3 million years ago and younger, and there is just no question. You look at it and say this Caribbean, this is Pac... (Notes truncated)
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- SONY TCD-D7
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- Sennheiser MKH 30; Sennheiser MKH 40
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