Sedentary Animal

Sedentary Animal

 

any one of the mostly marine bottom-dwelling animals attached to a substrate as adults. Sedentary animals include many protozoans, for example, some foraminifers, heliozoans, and infusorians (including vorticellae and stentors). Also sedentary are scyphozoans, sponges, hydroids, and coral polyps—many of them living in the tubes of polychaetous worms. Other sedentary animals are barnacles, some bivalve mollusks (for example, oysters and tridacnas), all bryozoans, brachiopods, phoronids, pterygobranchiates, pogonoforans, stalked crinoids, and ascidians.

Many sedentary animals are colonial forms, but solitary species frequently form large masses. Adaptations to a sedentary mode of life characteristic of many of these animals include the presence of a solid calcareous skeleton, hermaphroditism, increased fecundity, and the presence of tentacles to trap prey or devices to filter food particles from the water (sediment feeders). The transition to the sedentary mode of life frequently led in the course of evolution to a simplification of organization and to the origin of radial symmetry. Attachment to other animals may be the initial stage of transition to parasitism.

Sometimes included among sedentary animals are certain almost motionless, animals that are not attached to a substrate, for example, Mya mollusks, which pass their entire lives in a single hole, and some burrowing animals.

G. M. BELIAEV

References in periodicals archive ?
The association of the sarcopenia protocol and different diets showed that consumption of vegetable origin protein exclusively does not seem to be suitable for sedentary animals because, in this study, such consumption was not able to minimize the effects of sarcopenia in the morphological characteristics of muscles, especially in those of fast twitch, which tend to be most affected.
The mice that ran weighed 30% less than the sedentary animals after the five-week exercise period.
Sedentary animals were placed in the swimming tank for 1 min in the same period of exercise training protocol to mimic the water stress with the experimental protocol.
We observed decreased Johnsen score suggesting that it was a slight toxicity in CP treated testis of sedentary animals.
A sufficient number of same size (28 x 28 x 14 cm) acrylic cages without attached wheels were employed for Sedentary animals.
The sedentary animals that were able to run for 9 or 10 days were selected for the experiment.
The article, titled "Indoor confinement and physical inactivity rather than the proportion of dry food are risk factors in the development of feline type 2 diabetes mellitus," discounts a theory that seemed to make sense: With domestication and urbanization, cats went from being hunting animals that ate protein-rich prey to more sedentary animals the eat carbohydrate-rich diets --particularly dry cat food.
The collateral vessels themselves were larger and less prone to constriction - a problem exacerbated with PAD - than in sedentary animals.
Studies demonstrate physically active animals live longer than sedentary animals.