Filtering by Subject: Life Sciences

Taxon cycles in Neotropical mangroves

Valentí Rull

Published: 2022-09-27
Subjects: Life Sciences

The concept of taxon cycle involves successive range expansions and contractions over time through which a species can maintain indefinitely its core distribution. Otherwise, it becomes extinct. A typical taxon cycle can be subdivided into four stages: (I) expansion, (II) population differentiation, (III) local extinction and incipient speciation (eventually initiating a new cycle), and (IV) [...]

Eocene/Oligocene global disruption and the revolution of Caribbean mangroves

Valentí Rull

Published: 2022-09-27
Subjects: Life Sciences

In a recent paper, the author demonstrated that, in contrast with the prevailing view of eventual gradual regional differentiation from a hypothetical Cretaceous pantropical mangrove belt around the Tethys Sea, the Caribbean mangroves originated de novo in the Eocene after the evolutionary appearance of the first mangrove-forming tree species known for the region, the ancestor of the extant [...]

Calling time on alien plantscapes

Lennard Gillman

Published: 2022-09-22
Subjects: Life Sciences

Both urban and rural environments around the globe have become dominated by alien plant species to the extent that plantscapes from one region or country have become difficult to distinguish from many others. This process of plant community homogenisation comes at a cost to cultural identity and undermines people’s sense of place. Although invasive alien plant species have received considerable [...]

Calling Time on the Imperial Lawn and the Imperative for Greenhouse Gas Mitigation

Lennard Gillman, Barbara Bollard, Sebastian Leuzinger

Published: 2022-09-22
Subjects: Life Sciences

Non-technical summary As green spaces, lawns are often thought to capture carbon from the atmosphere. However, once mowing, fertlising, and irrigation are taken into account, we show that they become carbon sources, at least in the long run. Converting unused urban and rural lawn and grassland to treescapes can make a substantial contribution to reducing greenhouse gas emissions and increasing [...]

A Reproducible and Reusable Pipeline for Segmentation of Geoscientific Imagery

Daniel David Buscombe, Evan B Goldstein

Published: 2022-09-07
Subjects: Education, Engineering, Life Sciences, Physical Sciences and Mathematics

Segmentation of Earth science imagery is an increasingly common task. Among modern techniques that use Deep Learning, the UNet architecture has been shown to be a reliable for segmenting a range of imagery. We developed software - Segmentation Gym - to implement a data-model pipeline for segmentation of scientific imagery using a family of UNet models. With an existing set of imagery and labels, [...]

Characterising Ice Slabs in Firn Using Seismic Full Waveform Inversion

Emma Valerie Eve Pearce, Adam Booth, Sebastian Rost, et al.

Published: 2022-09-02
Subjects: Life Sciences

The density structure of firn has implications for hydrological and climate modelling, and ice shelf stability. The structure of firn can be evaluated from depth models of seismic velocity, widely obtained with Herglotz-Wiechert Inversion (HWI), an approach that considers the slowness of refracted seismic arrivals. However, HWI is strictly appropriate only for steady-state firn profiles and the [...]

The salmonid and the subsurface: Hillslope storage capacity determines the quality and distribution of fish habitat

David Nicholas Dralle, Gabriel Rossi, Phil Georgakakos, et al.

Published: 2022-08-25
Subjects: Life Sciences, Physical Sciences and Mathematics

Water in rivers is delivered via the critical zone that mantles landscapes. Consequently, the success of stream-rearing salmonids depends on the structure and resulting water storage and release processes of this zone. Physical processes below the land surface (the subsurface component of the critical zone) ultimately determine how landscapes ‘filter’ climate to manifest ecologically significant [...]

Fog as unconventional water resource: mapping fog occurrence and fog collection potential for food security in Southern Bolivia

Giulio Castelli, Aida Cuni Sanchez, Aixa Mestrallet, et al.

Published: 2022-08-22
Subjects: Engineering, Life Sciences

“Valles Cruceños” rural region, Bolivia, is characterized by an intrinsic water scarcity and an increasing pressure for food production by the neighboring and fast-sprawling city of Santa Cruz de la Sierra. Here, orographic fog is a daily phenomenon occurring all the year round, representing a sustainable water source for improving farmers’ resilience to dry spells and for promoting food security [...]

Consumption Ozone-Depleting Substances Impact in Central American GDAP: An Input Oriented Malmquist DEA Index

C. A. Zúniga-Gonzalez

Published: 2022-08-15
Subjects: Life Sciences, Social and Behavioral Sciences

This study measures the impact of consumption Ozone-Depleting Substances (ODS) on the Gross Domestic Agricultural Product (GDAP) of the Central American Countries. The methodology used is a non-parametric program under Data Envelopment Analyze (DEA) with the Malmquist indices methods. The DEA methodology permits defining the technology bound or performance. It discomposes the total factor [...]

DNA sequencing, microbial sensors, and the discovery of buried mineral resources

rachel simister, Bianca Patrizia Iulianella Phillips, Andrew P Wickham, et al.

Published: 2022-08-14
Subjects: Life Sciences

New mineral resources are critical to both sustaining human population growth and technological improvements that will enable global decarbonization. New and innovative exploration technologies that enable detection of deeply buried mineralization and host rocks are required to meet these demands. Here we show that DNA amplicon sequencing of soil microbial communities resolves anomalies in [...]

Sampling across large-scale geological gradients to study geosphere-biosphere interactions

Donato Giovannelli, Peter H. Barry, Joost M de Moor, et al.

Published: 2022-07-25
Subjects: Biogeochemistry, Earth Sciences, Environmental Sciences, Geochemistry, Life Sciences, Microbiology

Despite being one of the largest microbial ecosystems on Earth, with >1029 microbial cells, many basic open questions remain about how life exists and thrives in the deep subsurface biosphere, inside Earth’s crust. Much of this ambiguity is due to the fact that it is exceedingly difficult and (often prohibitively expensive) to directly sample the deep subsurface, requiring elaborate drilling [...]

Middle Miocene (Serravallian) wetland development on the northwest edge of Europe based on palynological analysis of the uppermost Brassington Formation of Derbyshire, United Kingdom

Jessica McCoy, Tabitha Barrass-Barker, Emma Hocking, et al.

Published: 2022-07-23
Subjects: Life Sciences, Physical Sciences and Mathematics

The Middle Miocene was a warmer and wetter interval than present-day (Steinthorsdottir et al., 2021). In the UK, the most extensive Middle Miocene deposit is the Serravallian Kenslow Member of the Brassington Formation as exposed at Bees Nest Pit, near Brassington, Derbyshire, UK. While known to contain a diverse palynological and palaeobotanical record, the stratigraphical distribution of these [...]

Discoverability of open data is critical to Earth system science

Aditi Sengupta, Nicholas Ward, James Stegen

Published: 2022-06-21
Subjects: Education, Life Sciences

There is consensus throughout the Earth system science research community that “open data” is of critical importance. However, discoverability and accessibility are often overlooked, raising the question of how useful archived, but not easily discoverable data are. As part of evaluating databases suitable for our own research data archival, we conducted a data discovery exercise (aggregators and [...]

Microcystin as a Biogeochemical Cycle: pools, fluxes, and fates of the cyanotoxin in aquatic ecosystems

Quin Shingai, Grace Marie Wilkinson

Published: 2022-06-17
Subjects: Ecology and Evolutionary Biology, Life Sciences, Terrestrial and Aquatic Ecology

Cyanotoxins such as microcystin pose a serious threat to aquatic ecosystems and human health. As such, there is a pressing need understand the production, movement, and storage of microcystin in lentic waterbodies. We constructed a biogeochemical cycle for microcystin through a comprehensive literature synthesis, identifying four major pools and nine fluxes. This conceptual model can be used as [...]

Quantifying baseline costs and cataloging potential optimization strategies for kelp aquaculture carbon dioxide removal

Struan Coleman, Tobias Dewhurst, David W. Fredriksson, et al.

Published: 2022-06-17
Subjects: Engineering, Life Sciences, Physical Sciences and Mathematics

To keep global surface warming below 1.5 °C by 2100, the portfolio of cost-effective CDR technologies must expand. To evaluate the potential of macroalgae CDR, we developed a kelp aquaculture bio-techno-economic model in which large quantities of kelp would be farmed at an offshore site, transported to a deep water "sink site", and then deposited below the sequestration horizon (1,000 m). We [...]


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