943 resultados para copulation duration


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From the Introduction. Little attention is paid, until now, to the duration of environmental procedures under Articles 226 and 228 EC Treaty, though these procedures are the only instrument at the disposal of the European Commission to enforce the application of EC environmental law1. Indeed, the Commission itself has no possibility to impose a fine or a penalty payment against a Member State, or to withhold sums under the Structural Funds, where a Member State persistently infringes Community environmental law. Rather, the Commission is obliged to first issue a Letter of Formal Notice against a Member State which infringes Community law. Where the infringement is not repaired, the Commission may issue a Reasoned Opinion against the Member State, and if also this does not lead to the compliance with EC law, it may appeal to the Court of Justice2.

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Over the past three decades Germany has repeatedly deregulated the law on temporary agency work by stepwise increasing the maximum period for hiring-out employees and allowing temporary work agencies to conclude fixed-term contracts. These reforms should have had an effect on employment duration within temporary work agencies. Based on an informative administrative data set we use a mixed proportional hazard rate model to examine whether employment duration has changed in response to these reforms. We find that the repeated prolongation of the maximum period for hiring-out employees significantly increased average employment duration while the authorization of fixed-term contracts reduced employment tenure.

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Bio-logging studies suffer from the lack of real controls. However, it is still possible to compare indirect parameters between control and equipped animals to assess the level of global disturbance due to instrumentation. In addition, it is also possible to compare the behaviour of free-ranging animals between individuals equipped with different techniques or instruments to determine the less deleterious approach. We instrumented Adelie Penguins (Pygoscelis adeliae) with internal or external time-depth recorders and monitored them in parallel with a control group during the first foraging trip following instrumentation. Foraging trip duration was significantly longer in the internally-equipped group. This difference was due to a larger number of dives, reflecting a lower foraging ability or a higher food demand, and longer periods of recovery at the surface. These longer recovery periods were likely to be due to a reduced efficiency to ventilate at the surface, probably because the implanted devices pressurised adjacent organs such as air sacs. Moreover, descent and ascent rates were slightly lower in externally-equipped penguins, presumably because external instrumentation increased the bird drag. Looking at our results, implantation appears more disadvantageous - at least for short-term deployment - than external equipment in Adelie Penguins, while this method has been described to induce no negative effects in long-term studies. This underlines the need to control for potential effects due to methodological aspects in any study using data loggers in free-ranging animals, to minimise disturbance and collect reliable data.

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Mode of access: Internet.

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"January 1983."