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Articles 241 - 244 of 244

Full-Text Articles in Animal Studies

Elephants In The Plant World, Dale J. Osborn May 1978

Elephants In The Plant World, Dale J. Osborn

Elephant

Survey of plants named for features that recall the elephant.


Meeting Of The Elephant Interest Group At Michigan State University, June 21, 1977, Jeheskel Shoshani Jul 1977

Meeting Of The Elephant Interest Group At Michigan State University, June 21, 1977, Jeheskel Shoshani

Elephant

Digest of the minutes of the first informal meeting of the Elephant Interest Group at the 57th Annual Meeting of the American Society of Mamalogists (ASM).


The Behaviour Of Swine, J. P. Signoret, B. A. Baldwin, D. Fraser, E. S. E. Hafez Jan 1975

The Behaviour Of Swine, J. P. Signoret, B. A. Baldwin, D. Fraser, E. S. E. Hafez

Mammalogy Collection

The pig was a forest-dwelling animal from the beginning of its history. In some parts of the world it has been domesticated for at least 7000 years. The European breeds of domestic swine were derived from the local wild pig, Sus scrofa. Herds ranged in pastures and forests and kept indoors only for fattening. The breeds in the Far East were derived from another wild pig, Sus vittatus, a smaller animal with shorter legs and a higher reproductive ability (Mohr 1960; Zeuner 1963). The two types interbred readily. The modem breeds of pig evolved from different crossings between the two …


Systematic And Evolutionary Implications Of Parthenogenesis In The Hymenoptera, C. N. Slobodchikoff, Howell V. Daly May 1971

Systematic And Evolutionary Implications Of Parthenogenesis In The Hymenoptera, C. N. Slobodchikoff, Howell V. Daly

Entomology Collection

Two types of parthenogenesis, arrhenotoky and thelytoky, exist in the Hymenoptera. Arrhenotoky, the development of males from unfertilized eggs, is present in all wasps and bees. Thelytoky, the development of diploid females from unfertilized eggs, is present in a few species. Two types of thelytoky, apomixis and automixis, are known. Most thelytokous Hymenoptera are automictic. No meiosis, only mitosis, occurs in apomixis. Meiosis does occur in automixis, allowing crossing-over and segregation of genes. Advantages of thelytoky are that heterotic combinations become fixed, gene loss is reduced, and reproduction requires only a single individual. One advantage of arrhenotoky is that genetic …