Stability of Enriched Aquatic Ecosystems

Abstract

to 7000 mg/ 100 ml in human plasma (3). The flow of aqueous humor is across the lumen, from inner to outer wall. The inner wall has openings that are 0.1 to 1.0 Am in diameter, the outer wall has large openings up to 80 ,um which lead to the veins in the episclera. With these facts in mind, perhaps what has been seen in both dog artery and human canal of Schlemm is a structure common to many endothelial cells. These projections may take part in the exchange of fluid across the endothelial cell by increasing surface area, rather than having an effect on the longitudinal flow of fluid. Their frequency was much greater in the dog pulmonary artery than in the Schlemm's canal in the human, which might relate to a more rapid rate of flow of fluid across the endothelial wall in the lung than in the eye.

Trophic interactions between heterotrophic nanoflagellates and bacterioplankton in manipulated seawater enclosures1

“…In a natural system, the trophic structure will be further complicated by predation on heterotrophic flagellates by ciliates and mesozooplankton and by spatial heterogeneity (McAllister et al 1972;Gilpin 1972). The high peak abundances of heterotrophic flagellates recorded in some enclosures might be considered partly a containment effect.…”

Biological control does not imply paradox

“…complete version of the classical theory was used by Rosensweig ( [17], pp. [564][565] to settle yet another well-known 'paradox' -the paradox of enrichment ( [11,18]).…”

“…More specifically, for a large squabbling coefficient, the enrichment paradox phenomenon does not occur, thus accommodating the class of ecosystems for which enrichment does not lead to destabilizing cycles. This latter part of his work from [17] is commonly overlooked, especially when the enrichment paradox is cited in the literature as another pathology of the classical theory, in addition to the biological control paradox.…”

Maternal effects on offspring consumption can stabilize fluctuating predator–prey systems

“…Yet increases in productivity (i.e. under eutrophic conditions) do not always lead to destabilization in natural systems, including populations of Daphnia [16][17][18]. Ecologists have thus struggled to bridge this gap between the predictions of simple mathematical models and the behaviour of natural systems.…”