no one can fail to be struck most forcibly with the clumsy costliness of the means by whicn present-day malaria control is effected. In his paper above referred to, the present writer has tried to show how delicate is the balance of the factors, the results of the inter' play of which permits a species to breed successfully. Since many of the actual factors are still to seek, their various ener...

Density-dependent competition for food resources influences both foraging ecology and reproduction in a variety of animals. The relationship between colony size, local prey depletion, and reproductive output in colonial central-place foragers has been extensively studied in seabirds; however, most studies have focused on effects of intraspecific competition during the breeding season, while lit...

A new species from Southern Brazil, named Culex (Melanoconion) ribeirensis is described. The description includes adults, pupal and larval stages, illustrating the morphological aspects and a picture of a breeding place. Some data about known distribution and bionomics are presented. UNITERMS: Culex (Melanoconion) ribeirensis. Culex. Insect vectors.

New findings of Anopheles mosquitoes in artificial containers are reported. In one, a plastic container served as a breeding place for Anopheles bellator larvae and, in another, four instar larvae of An. albitarsis s.l. were found in an abandoned toilet basin. Reflections are offered as to the selective pressure represented by the production, of an ever increasing scale, of disposable objects.

DNA analysis can have great practical application in the management and successful operation of farm. The technology is becoming a tremendous challenge for farm breeding domestic animals. In recent years, traditional selection methods been supplement by results molecular genome. Determining genetic distance sheep goat breeds had multiple significance. Microsatellites are used widely selection, ...

In migratory birds, the place and time of pair formation are important parameters for population structure and dynamics. Geese are not only migratory but also exhibit long-term monogamy, and therefore the first pairing event in a bird’s lifetime is of particular importance. Through behavioural observations of young, known-age, marked birds conducted on the wintering grounds during three winter ...

The cycle of gonad development and related changes in the length structure and spatial-temporal distribution of ninespine sticklebacks (Pungitius pungitius L.) in Puck Bay were studied. Observations were carried out in the shallow shore zones, as well as in the deeper epipelagic zone of the Bay. Ninespine sticklebacks reproduce in the brackish environment of Puck Bay, breeding in its warmer, in...

Information about demography and habitat use is key for the effective management of amphibian populations, because it is the basis for the long-term monitoring of endangered species and provides insights about the processes by which common species thrive in heavily transformed habitats. A capture-mark-recapture study was performed on a population of Perez’s frog (Pelophylax perezi) in central S...

Adult birds tend to show high fidelity to their breeding territory or disperse over relatively short distances. Gene flow among avian populations is thus expected to occur primarily through natal dispersal. Although natal dispersal is a critical demographic process reflecting the area over which population dynamics take place, low recapture rates of birds breeding for the first time have limite...