![]() The central, oxygen-poor part of near-spherical sponges is, however, rich in anaerobic microbes-those that do not require molecular oxygen to survive. Past this size, sponges change from near-spherical to vase-shaped forms. ![]() Researchers from the University of British Columbia and Florida International University explain that a "dimensional tension" is at play as sponges grow because they are forced to rely on the two-dimensional cross-section of their inhalant pores to supply their tridimensional growing bodies with oxygen dissolved in water.īy analyzing data from new and previous studies on sponges, and estimating their growth parameters, the researchers suggest that such respiratory stress in the central portion of spherical sponges, such as those that are commercially harvested, limits their maximum size.
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