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norskBlar i forfatter "Greenacre, Michael"
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Agta hunter-gatherer oral microbiomes are shaped by contact network structure
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-23)Here we investigate the effects of extensive sociality and mobility on the oral microbiome of 138 Agta hunter–gatherers from the Philippines. Our comparisons of microbiome composition showed that the Agta are more similar to Central African BaYaka hunter–gatherers than to neighbouring farmers. We also defined the Agta social microbiome as a set of 137 oral bacteria (only 7% of 1980 amplicon sequence ... -
Arctic sea ice algae differ markedly from phytoplankton in their ecophysiological characteristics
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-20)Photophysiological and biochemical characteristics were investigated in natural communities of Arctic sea ice algae and phytoplankton to understand their respective responses towards variable irradiance and nutrient regimes. This study revealed large differences in photosynthetic efficiency and capacity between the 2 types of algal assemblages. Sea ice algal assemblages clearly displayed increased ... -
Change in Fish Community Structure in the Barents Sea
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013)Change in oceanographic conditions causes structural alterations in marine fish communities, but this effect may go undetected as most monitoring programs until recently mainly have focused on oceanography and commercial species rather than on whole ecosystems. In this paper, the objective is to describe the spatial and temporal changes in the Barents Sea fish community in the period 1992–2004 while ... -
Erosion Dynamics of Cultivated Kelp, Saccharina latissima, and Implications for Environmental Management and Carbon Sequestration
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-28)A growing trend of interest for the cultivation of kelp is driven by predictions for high global demands of important commodities, which require the development of alternative supplies of natural resources. In this study the dynamics of loss of biomass from cultivated Saccharina latissima were studied from February to August 2018 at two kelp farms in Northern (69°45.26′N/019°02.18′E) and in Mid-Norway ... -
Functional diversity of the Barents Sea fish community
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014)This paper provides the first assessment of the functional diversity (FD) of the Barents Sea fish community. FD is recognized as an important driver of ecosystem functions and, thus, governs the adaptability of ecosystems in the face of disturbance. We integrate ecosystem survey data with an extensive trait matrix and show that fish FD displayed large spatial variation. The study period (2004 to ... -
Functional roles and redundancy of demersal Barents Sea fish: Ecological implications of environmental change
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-11-21)When facing environmental change and intensified anthropogenic impact on marine ecosystems, extensive knowledge of how these systems are functioning is required in order to manage them properly. However, in high-latitude ecosystems, where climate change is expected to have substantial ecological impact, the ecosystem functions of biological species have received little attention, partly due to the ... -
Large-scale patterns in community structure of benthos and fish in the Barents Sea
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-04-23)Biogeographical patterns have an ecological basis, but few empirical studies possess the necessary scale and resolution relevant for investigation. The Barents Sea shelf provides an ideal study area, as it is a transition area between Atlantic and Arctic regions, and is sampled by a comprehensive survey of all major functional groups. We studied spatial variation in species composition of demersal ... -
The making of the oral microbiome in Agta hunter-gatherers
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-22)Ecological and genetic factors have influenced the composition of the human microbiome during our evolutionary history. We analysed the oral microbiota of the Agta, a hunter–gatherer population where some members have adopted an agricultural diet. We show that age is the strongest factor modulating the microbiome, probably through immunosenescence since we identified an increase in the number of ... -
No observed developmental effects in early life stages of capelin (Mallotus villosus) exposed to a water-soluble fraction of crude oil during embryonic development
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-12)The rise in offshore oil and gas operations, maritime shipping, and tourism in northern latitudes enhances the risk of oil spills to sub-Arctic and Arctic coastal environments. Therefore, there is a need to understand the potential adverse effects of petroleum on key species in these areas. Here, we investigated the effects of oil exposure on the early life stages of capelin (Mallotus villosus), ...
