Filtering by Subject: Life Sciences

Geomorphologic Controls on the Evolution of Submarine Channels in the Clifdenian-Tongaporutuan Interval of the Southern Taranaki Basin, offshore New Zealand

Dicky Harishidayat, Chris Larsen, Kamaldeen Olakunle Leif Omosanya

Published: 2023-03-16
Subjects: Life Sciences

The Clifdenian-Tongaporutuan interval in the Southern Taranaki Basin experienced significant turbidity activities during the Middle to Late Miocene leading to formation and burial of several submarine channels. The chronologic evolution of these channels is difficult to prove because of their architectures, repeated cut- and- fill, stacking patterns, erosive nature, and spatial-temporal [...]

LHYMO: a new WFD-compliant multimetric index to assess lake hydromorphology and its application to French lakes

Alexandra Marie-José Carriere, Nathalie Reynaud, Aurore Gay, et al.

Published: 2023-03-16
Subjects: Life Sciences, Physical Sciences and Mathematics

1. Hydromorphology provides a physical framework for aquatic biocenoses. Its condition directly affects the quality of habitats available for fauna and flora and its assessment is therefore required by the EU Water Framework Directive (WFD) to assess the ecological status of lake water bodies. 2. In this study, we developed an index of Lake HYdroMOrphology (LHYMO) to provide a quantitative [...]

Towards robust interdisciplinary modeling of global human-environmental dynamics

Carsten Meyer

Published: 2023-02-20
Subjects: Agriculture, Biodiversity, Ecology and Evolutionary Biology, Environmental Studies, Forest Sciences, Geography, Life Sciences, Nature and Society Relations

Real-world environmental problems are typically vast, urgent, and complex. Confronted with such problems, we are often tempted to act fast by pulling together little bits and pieces from different fields and simply adding these to pre-existing models and frameworks. Seldom, though, do we pause long enough to look whether and for how long those larger structures we build can support reliable [...]

Did you say marine snow? Zooming into different types of organic matter particles and their importance in the open ocean carbon cycle

Chloé M.J. Baumas, Mina Bizic

Published: 2023-02-15
Subjects: Life Sciences

Marine particles are key to the cycling of major elements on Earth and play an important role in the balance of nutrients in the ocean. Three main categories of marine particles link the different parts of the open ocean by shaping carbon distribution: (i) Sinking; (ii) Suspended, and (iii) Ascending. Atmospheric carbon captured by phytoplankton in the surface water, is partly sequestered by [...]

Clumped isotopes in globally distributed Holocene coccoliths reveal their habitat depth

Luz Maria Mejia Ramirez, Stefano M. Bernasconi, Hongrui Zhang, et al.

Published: 2023-02-06
Subjects: Life Sciences, Physical Sciences and Mathematics

Reliable temperature reconstructions are necessary to improve climate reconstructions and comparisons with paleoclimate model simulations. Most existing paleotemperature proxies are based on organic and inorganic remains of marine organisms. Despite the evidence that the habitat depth of coccolithophores and other phytoplankton depend on their ability to balance light, nutrients, and grazing [...]

Reading the sediment archive of the Eastern Campeche Bank (southern Gulf of Mexico): From the aftermath of the Chicxulub impact to Loop Current variability

Christian Hübscher, Tobias Haecker, Christian Betzler, et al.

Published: 2023-02-04
Subjects: Life Sciences

This is the first high-resolution seismic study showing how the Chicxulub impact shaped the eastern slope of the Campeche Bank in the south-eastern Gulf of Mexico. The induced shock wave fractured Cretaceous strata causing the collapse of the upper slope and shelf over a length of ca. 200 km. Failed material was either transported downslope or remained in parts on the accommodation space created [...]

Non-perennial stream networks as directed acyclic graphs: The R-package streamDAG

Ken Aho, Cathy Kriloff, Sarah E Godsey, et al.

Published: 2023-01-11
Subjects: Life Sciences, Physical Sciences and Mathematics

Many conventional stream network metrics are time-invariant and/or do not consider the importance of individual stream locations to network functionality. As a result, they are not well-suited to non-perennial streams, in which hydrologic status (flowing vs. pooled vs. dry) can vary substantially in space and time. To help address this issue, we consider non-perennial streams as directed acyclic [...]

The Communication Distance of Non-Perennial Streams

Ken Aho, DeWayne Derryberry, Sarah E Godsey, et al.

Published: 2023-01-11
Subjects: Life Sciences, Physical Sciences and Mathematics

We developed Bayesian statistical approaches to assess non-perennial stream network connectivity. Our new methods allow: 1) consideration of changes to both local (stream segment) and global (stream network) connectivity over time, 2) incorporation of prior information from different data sources, and 3) straightforward computation of the posterior distributions of both active stream length and a [...]

Subsurface geologic, geophysical and chronological data for paleo-hydrologic reconstructions in Danube’s lower floodplain - delta system

Florin Filip, Liviu Giosan

Published: 2022-12-16
Subjects: Life Sciences

Abstract: Records of paleofloods can be reconstructed from special fluvial sedimentary environments such as oxbows; however, deposits in in such lakes, if they exist at all, are still short, on the order of hundreds of years. Longer sedimentary records need to be developed for evaluating paleo-hydrologic regimes of large rivers transiting from a natural Holocene to Anthropocene. Here we report [...]

Four meromictic (?) lakes in Itasca State Park, Minnesota, U.S.A.

Elizabeth Swanner Smith, Chris Harding, Sajjad Akam, et al.

Published: 2022-12-14
Subjects: Life Sciences, Physical Sciences and Mathematics

Four adjacent lakes (Arco, Budd, Deming, and Josephine) within Itasca State Park in Minnesota, USA are reported to be meromictic in the scientific literature. However, seasonally persistent chemoclines have never been documented. We collected seasonal profiles of temperature and specific conductance and placed temperature sensor chains in two lakes for ~ 1 year to explore whether these lakes [...]

Climate change impacts on surface heat fluxes in a deep monomictic lake

Ana I. Ayala, Jorrit P. Mesman, Ian D. Jones, et al.

Published: 2022-12-08
Subjects: Life Sciences

Turbulent and radiative energy exchanges between lakes and the atmosphere play an important role in determining the process of lake-mixing and stratification, including how lakes respond to climate and to climate change. Here we use a one-dimensional hydrodynamic lake model to assess seasonal impacts of climate change on individual surface heat flux components in Lough Feeagh, Ireland, a deep, [...]

A Sentinel-2 based multi-temporal monitoring framework for wind and bark beetle detection and damage mapping

Anna Candotti, Michaela De Giglio, Marco Dubbini, et al.

Published: 2022-11-18
Subjects: Life Sciences

The occurrence of extreme windstorms and increasing heat and drought events induced by climate change leads to coniferous forests showing severe damage and stress and making trees more vulnerable to spruce bark beetle infestations. The combination of abiotic and biotic disturbances in forests can cause drastic environmental and economic losses. The first step for containing such damage is the [...]

The unknown fate of macroplastic in mountain rivers

Maciej Liro, Tim van Emmerik, Anna Zielonka, et al.

Published: 2022-11-09
Subjects: Earth Sciences, Environmental Indicators and Impact Assessment, Environmental Monitoring, Geology, Geomorphology, Hydrology, Life Sciences, Natural Resources and Conservation, Sedimentology, Stratigraphy, Sustainability, Terrestrial and Aquatic Ecology, Water Resource Management

Mountain rivers are typically seen as relatively pristine ecosystems, supporting numerous goods (e.g., water resources) for human populations living not only in the mountain regions but also downstream from them. Recent evidence suggests, however, that mountain river valleys in populated areas can be substantially polluted by macroplastic (plastic item > 5 mm). It is, however, unknown how [...]

Gaia: Complex Systems Prediction for Time to Adapt to Climate Shocks

Allen G. Hunt, Muhammad Sahimi, Boris Faybishenko, et al.

Published: 2022-11-08
Subjects: Engineering, Life Sciences, Physical Sciences and Mathematics

A proposal, called “Gaia”, that life regulates Earth’s climate to its advantage, is partially supported by Earth’s climate history, wherein temperature fluctuations over the past ca. half billion years have mostly been small enough to protect life from extremes of climatic fluctuations, while global temperatures overall cooled during the 3.8 Ga when life was present, in spite of increased solar [...]

Drivers of fire regimes in the Brazilian Amazon from 2011-2020

Michel Valette, Yiannis Kountouris, Anna Freni Sterrantino, et al.

Published: 2022-10-18
Subjects: Environmental Studies, Forest Sciences, Life Sciences, Social and Behavioral Sciences

Over the last decade, carbon emissions due to forest degradation in the Brazilian Amazon, linked mainly to logging and wildfires, became larger than carbon emissions due to deforestation. Climatic and ecological processes affect the landscape’s flammability, while socio-economic processes influence the use of fire for deforestation and agricultural land management. However, a comprehensive [...]


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