Growth, Filtration and Respiration Under Superfluous Feeding in Single-Osculum Halichondria panicea Sponges DOI Creative Commons
Lars Kumala, Hans Ulrik Riisgård

Oceans, Год журнала: 2024, Номер 5(4), С. 965 - 981

Опубликована: Дек. 9, 2024

Filter-feeding sponges capture suspended food particles from ambient water, but little is known about the response of to high concentrations causing superfluous feeding. Here, through several experimental assays, we studied relationship between algal concentration in water column, filtration rate, respiration and specific growth rate single-osculum Halichondria panicea demosponge explants. Laboratory experiments showed that sponge explants filter seawater at a maximum when exposed naturally (low) concentrations, whereas resulted feeding reduced rates. Explants maintained above incipient overloading level rates were fair agreement with possible weight-specific 4% d−1. Although became due overloading, oxygen extraction efficiency increased, therefore did not cause growth. This suggests H. probably other have adapted low displaying continuous Osculum closure reflects protection mechanism rather than physiological regulatory concentrations.

Язык: Английский

Particle loads, contractile responses and cleaning in the demosponge Halichondria panicea DOI Creative Commons
Josephine Goldstein, Hans Ulrik Riisgård,

Rachael A. Kealy

и другие.

Journal of Experimental Marine Biology and Ecology, Год журнала: 2024, Номер 577, С. 152021 - 152021

Опубликована: Май 23, 2024

Sponges exposed to high concentrations of particles during filter-feeding may become overloaded, triggering closure the osculum and contraction sponge, thus preventing too many from entering aquiferous system. However, minimum particle concentration small versus larger that triggers contractions has not yet been described. Here, based on microscope-video recordings, we report our observations explants demosponge Halichondria panicea. Explants contracted within <1 h in response cyanobacteria (Cyanobium bacillare; 1 × 106 cells mL−1), 2 μm beads (1 107 algal (Rhodomonas salina), 10 105 mL−1, respectively). No occurred sponge these types at <0.5 104 mL−1. Likewise, inorganic marl ink induced ranging When were subsequently transferred clean water, they either expelled ingested mucus-entangled clumps with exhalant jet, or translocated surface along local peristaltic-like contractions. The trigger levels compared reported re-suspended sediment sea, observed contractile responses primarily serve protect sponges clogging extreme environmental events.

Язык: Английский

Процитировано

1
Growth, Filtration and Respiration Under Superfluous Feeding in Single-Osculum Halichondria panicea Sponges DOI Creative Commons
Lars Kumala, Hans Ulrik Riisgård

Oceans, Год журнала: 2024, Номер 5(4), С. 965 - 981

Опубликована: Дек. 9, 2024

Filter-feeding sponges capture suspended food particles from ambient water, but little is known about the response of to high concentrations causing superfluous feeding. Here, through several experimental assays, we studied relationship between algal concentration in water column, filtration rate, respiration and specific growth rate single-osculum Halichondria panicea demosponge explants. Laboratory experiments showed that sponge explants filter seawater at a maximum when exposed naturally (low) concentrations, whereas resulted feeding reduced rates. Explants maintained above incipient overloading level rates were fair agreement with possible weight-specific 4% d−1. Although became due overloading, oxygen extraction efficiency increased, therefore did not cause growth. This suggests H. probably other have adapted low displaying continuous Osculum closure reflects protection mechanism rather than physiological regulatory concentrations.

Язык: Английский

Процитировано

0