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9 results on '"Rawlins, Lauren D."'

4. Seasonal evolution of the supraglacial drainage network at Humboldt Glacier, northern Greenland, between 2016 and 2020.

Author

Rawlins, Lauren D., Rippin, David M., Sole, Andrew J., Livingstone, Stephen J., and Yang, Kang

Subjects
*GREENLAND ice, *DRAINAGE, *GLACIERS, *ICE sheets, *SNOW accumulation, *SPRING, *ALPINE glaciers
Abstract

Supraglacial rivers and lakes are important for the routing and storage of surface meltwater during the summer melt season across the Greenland Ice Sheet (GrIS) but remain poorly mapped and quantified across the northern part of the ice sheet, which is rapidly losing mass. Here we produce, for the first time, a high-resolution record of the supraglacial drainage network (including both rivers and lakes) and its seasonal behaviour at Humboldt Glacier, a wide-outlet glacier draining a large melt-prone hydrologic catchment (13 488 km 2), spanning the period 2016 to 2020 using 10 m spatial resolution Sentinel-2 imagery. Our results reveal a perennially extensive yet interannually variable supraglacial network extending from an elevation of 200 m a.s.l. to a maximum of ∼ 1440 m a.s.l. recorded in 2020, with limited development of the network observed in the low-melt years of 2017 and 2018. The supraglacial drainage network is shown to cover an area ranging between 966 km 2 (2018) and 1566 km 2 (2019) at its maximum seasonal extent, with spatial coverage of up to 2685 km 2 recorded during the early phases of the melt season when a slush zone is most prominent. Up-glacier expansion and the development of an efficient supraglacial drainage network as surface runoff increases and the snowline retreats is clearly visible. Preconditioning of the ice surface following a high-melt year is also observed, with an extreme and long-lasting 2019 melt season and over-winter persistence of liquid lakes, followed by low snow accumulation the following spring, culminating in earlier widespread exposure of the supraglacial drainage network in 2020 compared to other years. This preconditioning is predicted to become more common with persistent warmer years into the future. Overall, this study provides evidence of a persistent, yet dynamic, supraglacial drainage network at this prominent northern GrIS outlet glacier and advances our understanding of such hydrologic processes, particularly under ongoing climatic warming and enhanced runoff. [ABSTRACT FROM AUTHOR]

Published
2023
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7. [Comment] Interventions to prevent pandemic-driven diversity loss

Author

Fisher, Ben J., Shiggins, Connor J., Naylor, Angus W., Rawlins, Lauren D., Tallentire, Guy D., van den Heuvel, Floor, Poku, Craig, García-Ibáñez, Maribel I., Debyser, Margot, and Buckingham, Jack

Subjects
ComputingMilieux_GENERAL, ComputingMilieux_THECOMPUTINGPROFESSION, education, respiratory system, human activities, humanities
Abstract

The pandemic has badly affected the most diverse career stage in UK Earth sciences: early career researchers. Disrupted careers must be rescued with contingency plans, remote networks, a focus on mental health and mentor support if we are to retain diversity and talent.

Published
2021

9. The genetic architecture of adaptation: convergence and pleiotropy in Heliconiuswing pattern evolution

Author

Morris, Jake, Navarro, Nicolas, Rastas, Pasi, Rawlins, Lauren D., Sammy, Joshua, Mallet, James, and Dasmahapatra, Kanchon K.

Abstract

Unravelling the genetic basis of adaptive traits is a major challenge in evolutionary biology. Doing so informs our understanding of evolution towards an adaptive optimum, the distribution of locus effect sizes, and the influence of genetic architecture on the evolvability of a trait. In the Müllerian co-mimics Heliconius melpomeneand Heliconius eratosome Mendelian loci affecting mimicry shifts are well known. However, several phenotypes in H. melpomeneremain to be mapped, and the quantitative genetics of colour pattern variation has rarely been analysed. Here we use quantitative trait loci (QTL) analyses of crosses between H. melpomeneraces from Peru and Suriname to map, for the first time, the control of the broken band phenotype to WntAand identify a ~100 kb region controlling this variation. Additionally, we map variation in basal forewing red-orange pigmentation to a locus centred around the gene ventral veins lacking(vvl). The locus also appears to affect medial band shape variation as it was previously known to do in H. erato. This adds to the list of homologous regions controlling convergent phenotypes between these two species. Finally we show that Heliconiuswing-patterning genes are strikingly pleiotropic among wing pattern traits. Our results demonstrate how genetic architecture can shape, aid and constrain adaptive evolution.

Published
2019
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