Where is rare? global patterns of rarity in oceanic microbes

Microbes drive global biogeochemical cycles and ecosystem functions, thus providing essential ecosystem services. Yet, most microbial species are rare. While there is evidence that rare species make significant contributions to ecosystem functions, the distribution of rare microbial taxa remains u...

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Päätekijä: Summanen, Wilma
Muut tekijät: Matemaattis-luonnontieteellinen tiedekunta, Faculty of Sciences, Bio- ja ympäristötieteiden laitos, Department of Biological and Environmental Science, Jyväskylän yliopisto, University of Jyväskylä
Aineistotyyppi: Pro gradu
Kieli:eng
Julkaistu: 2024
Aiheet:
Linkit: https://jyx.jyu.fi/handle/123456789/101672
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author Summanen, Wilma
author2 Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science Jyväskylän yliopisto University of Jyväskylä
author_facet Summanen, Wilma Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science Jyväskylän yliopisto University of Jyväskylä Summanen, Wilma Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science Jyväskylän yliopisto University of Jyväskylä
author_sort Summanen, Wilma
datasource_str_mv jyx
description Microbes drive global biogeochemical cycles and ecosystem functions, thus providing essential ecosystem services. Yet, most microbial species are rare. While there is evidence that rare species make significant contributions to ecosystem functions, the distribution of rare microbial taxa remains uncharacterised, especially in terms of rare species’ functional traits. Identifying patterns of rarity and quantifying functional rarity in microbes is important for defining other theoretical frameworks, identifying areas or species in need of conservation, and predicting environmental change and ecosystem response. Here, I determined (1) latitudinal gradients and hotspots of rarity for marine microbes (bacteria) and (2) whether rare taxa could provide different functions to more abundant taxa. Microbes have been hypothesised to follow similar ecological patterns as macroorganisms, and if this is the case, I hypothesised that most rare taxa should be found at the middle latitudes and the tropics, and a portion of the rare biosphere should also be functionally rare (i.e. possess distinct and unique functional traits). Utilising sequence data from the Tara Oceans expedition and a bioinformatics pipeline, I found that rarity correlates with latitude on a hump-shaped pattern, with the highest incidence of rare taxa found at middle latitudes. Functional distinctiveness did not show substantial variation between communities, but the functional diversity of rare taxa appears to be greater than that of more abundant taxa. Furthermore, phylogenetic clustering of functional distinctiveness was identified in phyla that are involved in major biogeochemical cycles. These results indicate areas that may be significant hotspots of biodiversity and important for ecosystem function, but also susceptible to ecosystem change and disturbance and thus need more attention. Altogether, these results give novel insights into latitudinal patterns of rarity and functional rarity in microbial communities and call for further studies with more extensive sampling to understand the effects of anthropogenic activities and climate change on microbial communities and ecosystem response.
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Yet, most microbial species are rare. While there is evidence that rare species make significant contributions to\necosystem functions, the distribution of rare microbial taxa remains\nuncharacterised, especially in terms of rare species\u2019 functional traits. Identifying patterns of rarity and quantifying functional rarity in microbes is important for defining other theoretical frameworks, identifying areas or species in need of conservation, and predicting environmental change and ecosystem response. Here, I determined (1) latitudinal gradients and hotspots of rarity for marine microbes (bacteria) and (2) whether rare taxa could provide different functions to more abundant taxa. 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spellingShingle Summanen, Wilma Where is rare? : global patterns of rarity in oceanic microbes functional rarity latitudinal gradient microecology rare biosphere Ekologia ja evoluutiobiologia Ecology and evolutionary biology bioinformatiikka levinneisyys mikrobit ekosysteemit (ekologia) bakteerit mikro-organismit
title Where is rare? : global patterns of rarity in oceanic microbes
title_full Where is rare? : global patterns of rarity in oceanic microbes
title_fullStr Where is rare? : global patterns of rarity in oceanic microbes Where is rare? : global patterns of rarity in oceanic microbes
title_full_unstemmed Where is rare? : global patterns of rarity in oceanic microbes Where is rare? : global patterns of rarity in oceanic microbes
title_short Where is rare?
title_sort where is rare global patterns of rarity in oceanic microbes
title_sub global patterns of rarity in oceanic microbes
title_txtP Where is rare? : global patterns of rarity in oceanic microbes
topic functional rarity latitudinal gradient microecology rare biosphere Ekologia ja evoluutiobiologia Ecology and evolutionary biology bioinformatiikka levinneisyys mikrobit ekosysteemit (ekologia) bakteerit mikro-organismit
topic_facet Ecology and evolutionary biology Ekologia ja evoluutiobiologia bakteerit bioinformatiikka ekosysteemit (ekologia) functional rarity latitudinal gradient levinneisyys microecology mikro-organismit mikrobit rare biosphere
url https://jyx.jyu.fi/handle/123456789/101672 http://www.urn.fi/URN:NBN:fi:jyu-202504293524
work_keys_str_mv AT summanenwilma whereisrareglobalpatternsofrarityinoceanicmicrobes