1,720,979 research outputs found
Karyotypes and habitat interrelations among soil Arthropoda: Collembola and Protura
No full textIn five species of Onychiurus (Collembola Onychiuridae) the diploid chromosome number is higher in animals of narrower width. In three species of Acerentomon (Protura, Acerentomidae) the number of the chromosome arms (FN), not the chromosme number, is inversely correlated to the length of the foretarsus and consequently to the narrowness of the passages they can frequent
Cariologia e sistematica di Lernaea cyprinacea L. (Crustacea, Copepoda).
No full textVengono riferiti i primi risultati sulla cariologia di Lernaea cyprinacea L..Tutti gli esemplari sono stati raccolti in Italia (Umbria, Emilia Romagna, Lombardia) ed erano parassiti di varie specie di Teleostei. L'analisi cariologica ha evidenziato per tutti gli esemplari 2n= 16
Evoluzione del cariotipo negli animali del suolo: i miriapodi Pauropodi.
No full textVengono presentati i primi dati sulla cariologia dei Pauropodi al momento praticamente nulli. Si riferiscono i dati preliminari dell'analisi cariotipica di tre diverse specie. Allopauropus (A.) brevisetus, Allopauropus (A.) danicus e pauropus huxley
Analisi cariologica di tre specie di Onichiuridi (Collembola, Insecta)
No full textL'analisi cariologica di tre specie di collemboli onichiuridi, tutti appartenenti allo stesso genere Onychiurus (Protaphorura) ha messo in evidenza l'alto numero di cromosomi del corredo diploide di queste specie, con 2n= 16 in O. quadriocellatus e 2n= 18 in O. armatus e O. glebatus. Questi numeri sono i più alti finora accertati nei collemboli
Inquinamento delle acque e parassitismo da Lernaea cyprinacea L., crostaceo copepode parassita di pesci dulciacquicoli.
No full textVengono riportati i dati di studi relativi agli effetti di metalli pesanti (piombo, rame, zinco) degli ioni ammonio, nitroso e nitrico e di una sostanza base di molti detersivi (sale sodico dell'acido dodecil-benzen-sulfonico, sul cipepode ectoparassita di pesci dulciacquicoli Lernaea cyprinacea
Effects of the herbicide atrazine on Collembola
No full textVengono esposti i risultti ottenuti sia da ricerche in campo che da test di laboratorio condotte per valutare gli effetti dell'erbicida atrazina suli Collmbol
Glycogen in a parasitic crustacean, Lernaea cyprinacea L., during development and in adult life.
No full textThe distribution of glycogen in a parasitic crustacean, Lernaea cyprinacea L., during development and in adult life was studied
Veal calf liquid manure effects on Collembola populations.
No full textThe effects of enrichments with liquid manure from veal calf fed exclusively on a powdered milk diet on Collembola populations were investigated. The manure was sprayed in a single application in different seasons and amounts in two contiguous parts of a field. Enrichment performed in autumn with a dose containing N-NH4+/ha at the maximum threshold used for agronomic management resulted in a consistent numerical decrease of the Collembola as a whole two weeks after treatment, whereas in June following spraying with one half the dosage, the Collembola number did not change. The results obtained with the two treatments can be attributed to the different species composition of the Collembola population in the two seasons, in addition to the different sensitivity of individual species to the treatment dosage. Enrichment with even marked amounts of veal calf liquid manure in a single dosage did not seem to have persistent impact, since changes in the biocenosis generally recovered in a relatively short time
Effects of atrazine on corn aphids
No full textThe effects on animal feeding on resistant plants of widespread use of herbici were studied utilizing Sipha maydis and Schizaphis graminum, which feed on phloem sap of corn, as test-organism. Atrazine is toxic to aphids, and this effects is manifest rather rapdly. The most striking damage occured in the digestive apparatus
Morphological observations on molluscan neurons in culture.
No full textThe morphological features of the neurons long-term cultured of the molluscan Planorbis corneus were reported
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