Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: June 1, 2025
Paul's Rocks, non-volcanic Singular Incrustations Insects the first Colonists of Islands Fernando Noronha Bahia Burnished Rocks Habits of a Diodon Pelagic Confervae and Infusoria Causes of discoloured Sea.
In 1897 it was estimated that since pelagic sealing began upward of 400,000 adult female seals had been killed at sea, and over 300,000 young seals had died of starvation as the result. The revolting barbarity of such a practise, as well as the wasteful destruction which it involves, needs no demonstration and is its own condemnation.
The observations which I have collected on the force and direction of the winds, on the temperature and rapidity of the currents, on the influence of the seasons, or the variable declination of the sun, have thrown some light on the complicated system of those pelagic floods that furrow the surface of the ocean: but it is less easy to conceive the causes of the change in the movement of the waters at the same season and with the same wind.
The exposure of a shoal of the beautiful blue pelagic Siphonophore, Velella, for a few hours, enabled me to collect a large quantity of gas, which yielded from 24 to 25 per cent. of oxygen, that subsequently squeezed out from the interior of the chambered cartilaginous float, giving only 5 per cent.
That I was not the only one who justly appreciated the noble character of Georges is rendered evident by the following circumstance. Having accompanied M. Carbonnet to the police, where he went to demand his papers, on the day of his removal to St. Pelagic, we were obliged to await the return of M. Real, who was absent. M. Desmarets and several other persons were also in attendance.
It is worth mentioning that in the actual development of Turbot and Brill the metamorphosis takes place to a considerable degree while the young fish is pelagic, before the habit of lying on the ground is assumed, but of course this is no evidence that the change was not originally caused by the habit of lying on the ground.
The central and intertropical parts of the Atlantic swarm with Pteropoda, Crustacea, and Radiata, and with their devourers the flying-fish, and again with their devourers the bonitos and albicores; I presume that the numerous lower pelagic animals feed on the Infusoria, which are now known, from the researches of Ehrenberg, to abound in the open ocean: but on what, in the clear blue water, do these Infusoria subsist?
It would not, for instance, at first occur to any one that the transparency of the Medusae, or jelly-fish, is of the highest service to them as a protection; but when we are reminded by Haeckel that not only the Medusae, but many floating Mollusca, crustaceans, and even small oceanic fishes partake of this same glass-like appearance, often accompanied by prismatic colours, we can hardly doubt that they thus escape the notice of pelagic birds and other enemies.
The central and intertropical parts of the Atlantic swarm with Pteropoda, Crustacea, and Radiata, and with their devourers the flying- fish, and again with their devourers the bonitos and albicores; I presume that the numerous lower pelagic animals feed on the Infusoria, which are now known, from the researches of Ehrenberg, to abound in the open ocean: but on what, in the clear blue water, do these Infusoria subsist?
One of the chief differences between structural features and correlations which are adaptive from those which are not is the process of metamorphosis, where we see the structure changing in the individual life history as the mode of life changes. The egg of the Flat-fish develops into a symmetrical pelagic larva similar to that of many other marine fishes.
Word Of The Day
Others Looking