Mixed Languages as Outcomes of Code-Switching: Recent Examples from Australia and Their Implications

There has been much debate about whether mixed languages arise from code-switching. This paper presents one clear example of this kind of genesis, Gurindji Kriol, and other probable examples, from recent language contact in Australia between traditional Australian languages and English-based pidgins/creoles. In particular the paper focuses on what has been called the Verbal-Nominal split in the genesis of these languages, which is parallel to other cases elswhete in the world, such as Michif. Here the Verbal-Nominal split is reanalysed as a split between INFL (Tense-Aspect-Mood) dominated elements and the rest of the clause. There are two classes of such INFL mixed languages with contrasting characteristics: those in which the new language takes over the INFL elements and the nominal morphology is still drawn from the old language, like Gurindji Kriol; and those in which the verb and its morphology is retained from the old language but other elements are drawn from the new language. This is explained in terms of the 'arrested turnover' hypothesis of Myers-Scotton. The original 'centre of gravity' hypothesis of McConvell related the two kinds of mixed language outcomes to the grammatical type of the old language: whether it was 'dependent-marking' or 'headmarking'. In this paper this hypothesis is modified by seeing the important causal factor in the second type as incorporation of INFL and pronouns in the verb in head-marking and polysynthetic languages. Finally some other examples of mixed languages of the INFL-split type are mentioned, and a research program outlined aiming to detect where this kind of language-mixing forms part of the history of other languages by looking at the current pattern of composition of elements from different language sources.

Mass-mediated sex differences in climbing patterns support the gravity hypothesis of sexual size dimorphism

The gravity hypothesis of sexual size dimorphism can explain the patterns of extreme sexual size dimorphism in spiders (males smaller than females) because small males climb faster and therefore may be better at reaching females that live in high habitats. Recently, the main prediction of a negative relationship between climbing speed and body size in spiders has been called into question. Here we induced males and females of the spider Leucauge venusta (Tetragnathidae) to run on vertical surfaces and found partial support for the gravity hypothesis. As predicted, males climb faster than females and we demonstrated that this effect is an indirect effect mediated by the negative relationship between body mass and climbing speed. We validate our results using simulated data showing that there is enough statistical efficiency in our data set to support our conclusions. We distinguished between direct and indirect effects (through mass) on sex differences in climbing speed by means of path analysis. Thus, we provide empirical evidence that by being smaller, males are able to climb faster than females. However, we found only a barely significant negative relationship between climbing speed and body size when only males were considered. Reasons for such results are discussed within the text.