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- Bentley, Michael J., et al.
(författare)
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A community-based geological reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum
- 2014
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Ingår i: Quaternary Science Reviews. - : Elsevier BV. - 0277-3791 .- 1873-457X. ; 100, s. 1-9
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Tidskriftsartikel (refereegranskat)abstract
- A robust understanding of Antarctic Ice Sheet deglacial history since the Last Glacial Maximum is important in order to constrain ice sheet and glacial-isostatic adjustment models, and to explore the forcing mechanisms responsible for ice sheet retreat. Such understanding can be derived from a broad range of geological and glaciological datasets and recent decades have seen an upsurge in such data gathering around the continent and Sub-Antarctic islands. Here, we report a new synthesis of those datasets, based on an accompanying series of reviews of the geological data, organised by sector. We present a series of timeslice maps for 20 ka, 15 ka, 10 ka and 5 ka, including grounding line position and ice sheet thickness changes, along with a clear assessment of levels of confidence. The reconstruction shows that the Antarctic Ice sheet did not everywhere reach the continental shelf edge at its maximum, that initial retreat was asynchronous, and that the spatial pattern of deglaciation was highly variable, particularly on the inner shelf. The deglacial reconstruction is consistent with a moderate overall excess ice volume and with a relatively small Antarctic contribution to meltwater pulse la. We discuss key areas of uncertainty both around the continent and by time interval, and we highlight potential priorities for future work. The synthesis is intended to be a resource for the modelling and glacial geological community.
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| 3. |
- Tan, Cedric K.W., et al.
(författare)
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Sex-specific responses to sexual familiarity, and the role of olfaction in Drosophila
- 2013
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Ingår i: Proceedings of the Royal Society of London. Biological Sciences. - : Royal Society Publishing. - 0962-8452 .- 1471-2954. ; 280:1771, s. 20131691-
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Tidskriftsartikel (refereegranskat)abstract
- Studies of mating preferences have largely neglected the potential effects ofindividuals encountering their previous mates (‘directly sexually familiar’),or new mates that share similarities to previous mates, e.g. from the samefamily and/or environment (‘phenotypically sexually familiar’). Here, weshow that male and female Drosophila melanogaster respond to the direct andphenotypic sexual familiarity of potential mates in fundamentally differentways. We exposed a single focal male or female to two potential partners. Inthe first experiment, one potential partner was novel (not previously encountered)and one was directly familiar (their previous mate); in the secondexperiment, one potential partner was novel (unrelated, and from a differentenvironment from the previous mate) and one was phenotypically familiar(from the same family and rearing environment as the previous mate). Wefound that males preferentially courted novel females over directly or phenotypicallyfamiliar females. By contrast, females displayed aweak preference fordirectly and phenotypically familiar males over novel males. Sex-specificresponses to the familiarity of potential mates were significantly weaker orabsent in Orco1 mutants, which lack a co-receptor essential for olfaction, indicatinga role for olfactory cues in mate choice over novelty. Collectively, ourresults show that direct and phenotypic sexual familiarity is detected througholfactory cues and play an important role in sex-specific sexual behaviour.
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