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 ?
Mice who swam and were treated with irisin-blocking substances performed no better on memory tests than sedentary animals after infusions with beta amyloid.
Mesenteric fat weight was lower in group TS compared to SS, and again insulin administration to the trained animals (TI) resulted in mesenteric fat weight not different from sedentary animals (P>0.05).
In fact, the total dendritic area in the posterior hypothalamus, cuneiform nucleus and solitary tract regions were much lower in trained animals than in sedentary animals. Also, another mechanism involved in hemodynamic improvement is baroreflex regulation, which after regular practice of physical exercise has its sensitivity increased due to a significant increase in the sensitivity of the aortic depressor nerve (28).
The post hoc test showed that the ratio between tGPX/tSOD was significantly reduced by the transition from 12 to 14 months in the ovaries of sedentary animals (P < 0.05, Cohen's d-based effect size = 0.965) (S4 versus S2, Figure 2(c)).
Assessing the effect of training, it appears that trained animals had a higher testicular weight, compared to sedentary animals; however, this difference was only significant between the groups treated with anabolic steroid.
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. This finding is accordingly to Ilbey et al.
A sufficient number of same size (28 x 28 x 14 cm) acrylic cages without attached wheels were employed for Sedentary animals. Sixteen wooden incubators (60 x 60 x 60 cm) with polycarbonate roofs, provided with a 150W heat wave lamp connected to a thermostat and a probe positioned at the level of the animal, which allowed individual control of ambient temperature for each animal were available for the Isolated condition.
179, Issue 3).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.