... And some even hotter

Article Abstract:

Aquatic eukaryotes that live near deep-sea hydrothermal vents may be able to tolerate much higher temperatures than their land-dwelling counterparts such as the desert ant, Cataglyphis bombycina. Research on alvinellid polychaete worms, a group of vent-inhabiting species, carried out at the East Pacific Rise from Oct 1991 to Apr 1992 found one worm with an amazingly high temperature of 105 degrees C. These creatures may set the upper limit for thermotolerance among eukaryotes.

Polychaeta, Polychaetes, Marine fauna, Marine animals, Animal heat, Animal body heat

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Deep-breathing cephalopods ?

Article Abstract:

Enlarged gills found in some cephalopods are an adaption to low oxygen, enabling them to cope with the hypoxic conditions existing in deep sea. Both fishes and cephalopods have lower metabolic rates at depth. Lowered critical oxygen partial pressures, enhanced activity of respiratory proteins and decreased activity are also adaptions of fish to low oxygen. Fish biomass is more than twice that of cephalopods at all depths showing that fishes are outnumbering the cephalopods.

Observations, Adaptation (Biology), Evolutionary adaptation, Gills, Cephalopoda, Cephalopods

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Inorganic carbon uptake in hydrothermal vent tubeworms facilitated by high environmental pCO2

Article Abstract:

Elevated environmental CO2 partial pressure (pCO2) of the marine invertebrate Riftia pachyptila determines internal total CO2 and pCO2. This facilitates carbon dioxide transport and diffusion to the symbionts, intracellular carbon-fixing sulphide-oxidizing bacteria. Moreover, elevated pCO2 is probably necessary for the functioning of this species and other chemoautotropic symbioses.

Carbon dioxide, Inorganic compounds, Worms, Worms (Animals)

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