John J. Wiens is an evolutionary biologist at SUNY-Stony Brook. His contempo assignment offers acumen on a abiding paradox. That is, although it is best acceptable that all angle acquired in the oceans, today alone 15-25% of the world’s biodiversity is begin in ocean habitats. Freshwaters accept added angle breed than oceans. Why would that be, if angle originally acquired in the oceans? Dr. Wiens’ cardboard with Greta Vega – blue-blooded Why Are There So Few Angle in the Sea? – was appear online in February, 2012 in the account Proceedings of The Royal Society B. Benjamin Duval interviewed John J. Wiens on account of EarthSky.

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John J. Wiens

Why is there such a aberration in biodiversity amid beginning baptize and oceans, back it is about assertive that activity acquired in the oceans?

A decidedly absorbing aftereffect is that we begin that the all-inclusive majority of abyssal angle allegedly acquired from freshwater ancestors. Given that animals in general, and angle in particular, best acceptable originated in the oceans, the arrangement we acquisition suggests that age-old extinctions in the ocean ability accept wiped out some of the age-old associates of the accumulation we focused on – the abyssal ray-finned fish. The ray-finned angle accommodate 96% of all angle species, including all angle except a few aberrant groups such as the sharks and rays, lamprey and hagfish, and lungfish and coelacanth. These age-old extinctions would accept contributed to the abreast low biodiversity of angle in the oceans.

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Our after-effects advance that age-old extinctions in the abyssal ambiance ability accept wiped out these fishes active in the oceans, and that the oceans were again re-colonized from freshwater habitats. If so, best abyssal angle breed active today are descended from that re-colonization.

That would accept larboard beneath time for biodiversity to body up in the oceans. This arrangement of age-old afterlife and added contempo re-colonization ability advice explain why the oceans are now so species-poor, alike for fish.

How did you accept to assignment with this accumulation of bacilli to abode this question?

We were primarily aggravating to authorize what the levels of angle assortment are in freshwater and abyssal systems, and what ability explain differences in these levels, absorption on the ray-finned fish.

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Schematic of sexually mature male sea lamprey showing tissue … – sea lamprey diagram | sea lamprey diagram

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How do you abstraction the change of such a ample accumulation of animals at a all-around scale?

Using atomic abstracts and fossils, we did a statistical analyses application evolutionary copse [a aberration diagram or “tree” assuming evolutionary relationships amid assorted biological species]. We additionally acclimated a ample database (called FishBase) on the habitats of about all active angle species.

We showed that levels of assortment are agnate in freshwater and abyssal environments, admitting the abundant greater area, volume, and abundance of abyssal environments.

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Cross Section View of a Sea Lamprey | ClipArt ETC – sea lamprey diagram | sea lamprey diagram

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Bottom Line: Application a huge database of angle analysis at the all-around level, John J. Wiens and Greta Vega advance that lower angle assortment in oceans compared to beginning baptize is acceptable due to age-old extinctions in the ocean, and about-face in freshwaters. Furthermore, abounding accepted ocean fishes acquired in freshwaters and re-colonized ocean environments. Their paper, blue-blooded Why Are There So Few Angle in the Sea?, was appear online in February, 2012 in the account Proceedings of The Royal Society B.

Why Are There So Few Angle in the Sea?

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