The development of grammatical morphemes in the speech of young second language learners within a conversational context

This is a longitudinal study of the development of grammatical morphemes in the speech of young children using English as a second language in a classroom context. The theoretical standpoint adopted is that first and second language development in 'natural' contexts is facilitated by the same underlying processes, and that central to this development is the notion of meaningful interaction, through which conversational partners negotiate shared understanding. It is argued that if the interactional features identified as facilitative in first language development are reproduced within the classroom context, the sequence of development identified in this study will reflect the sequence identified in first language learning. The data was collected over a period of six terms and initial analysis reveals similarities between the process of morphemic development in first and classroom second language learning. As a result of these findings, the analysis is then extended to take account of the conversational context in which development occurs. Particular reference is made to repetition and formulaic speech which the learners appear to use as a means of producing verb morphemes within the context of interrogatives and negation. The methodological significance of the identification and interpretation of strategies within an interactional framework is discussed. Analysis reveals that in addition to the general processes identified, which account for a shared sequence of development in first and second language development, there are individual differences. These differences are related to the learners' mother tongue, the classroom context and the use of particular strategies. Each one is explored in relation to the management of conversational interaction and underlying grammatical development. The incomplete acquisition of grammatical morphemes by the end of the study is seen as significant and the study concludes by suggesting that this has important implications for the nature of interaction in a classroom context

A Noninvasive Method For In situ Determination of Mating Success in Female American Lobsters (Homarus americanus)

Despite being one of the most productive fisheries in the Northwest Atlantic, much remains unknown about the natural reproductive dynamics of American lobsters. Recent work in exploited crustacean populations (crabs and lobsters) suggests that there are circumstances where mature females are unable to achieve their full reproductive potential due to sperm limitation. To examine this possibility in different regions of the American lobster fishery, a reliable and noninvasive method was developed for sampling large numbers of female lobsters at sea. This method involves inserting a blunt-tipped needle into the female\u27s seminal receptacle to determine the presence or absence of a sperm plug and to withdraw a sample that can be examined for the presence of sperm. A series of control studies were conducted at the dock and in the laboratory to test the reliability of this technique. These efforts entailed sampling 294 female lobsters to confirm that the presence of a sperm plug was a reliable indicator of sperm within the receptacle and thus, mating. This paper details the methodology and the results obtained from a subset of the total females sampled. Of the 230 female lobsters sampled from George\u27s Bank and Cape Ann, MA (size range = 71-145 mm in carapace length), 90.3% were positive for sperm. Potential explanations for the absence of sperm in some females include: immaturity (lack of physiological maturity), breakdown of the sperm plug after being used to fertilize a clutch of eggs, and lack of mating activity. The surveys indicate that this technique for examining the mating success of female lobsters is a reliable proxy that can be used in the field to document reproductive activity in natural populations

A Noninvasive Method For In situ Determination of Mating Success in Female American Lobsters (Homarus americanus)

Despite being one of the most productive fisheries in the Northwest Atlantic, much remains unknown about the natural reproductive dynamics of American lobsters. Recent work in exploited crustacean populations (crabs and lobsters) suggests that there are circumstances where mature females are unable to achieve their full reproductive potential due to sperm limitation. To examine this possibility in different regions of the American lobster fishery, a reliable and noninvasive method was developed for sampling large numbers of female lobsters at sea. This method involves inserting a blunt-tipped needle into the female\u27s seminal receptacle to determine the presence or absence of a sperm plug and to withdraw a sample that can be examined for the presence of sperm. A series of control studies were conducted at the dock and in the laboratory to test the reliability of this technique. These efforts entailed sampling 294 female lobsters to confirm that the presence of a sperm plug was a reliable indicator of sperm within the receptacle and thus, mating. This paper details the methodology and the results obtained from a subset of the total females sampled. Of the 230 female lobsters sampled from George\u27s Bank and Cape Ann, MA (size range = 71-145 mm in carapace length), 90.3% were positive for sperm. Potential explanations for the absence of sperm in some females include: immaturity (lack of physiological maturity), breakdown of the sperm plug after being used to fertilize a clutch of eggs, and lack of mating activity. The surveys indicate that this technique for examining the mating success of female lobsters is a reliable proxy that can be used in the field to document reproductive activity in natural populations