TY  - JOUR
A1  - D'Hondt, Steven
A1  - Spivack, Arthur J.
A1  - Pockalny, Robert
A1  - Ferdelman, Timothy G.
A1  - Fischer, Jan P.
A1  - Kallmeyer, Jens
A1  - Abrams, Lewis J.
A1  - Smith, David C.
A1  - Graham, Dennis
A1  - Hasiuk, Franciszek
A1  - Schrum, Heather
A1  - Stancin, Andrea M.
T1  - Subseafloor sedimentary life in the South Pacific Gyre
N2  - The low-productivity South Pacific Gyre (SPG) is Earth's largest oceanic province. Its sediment accumulates extraordinarily slowly (0.1-1 m per million years). This sediment contains a living community that is characterized by very low biomass and very low metabolic activity. At every depth in cored SPG sediment, mean cell abundances are 3 to 4 orders of magnitude lower than at the same depths in all previously explored subseafloor communities. The net rate of respiration by the subseafloor sedimentary community at each SPG site is 1 to 3 orders of magnitude lower than the rates at previously explored sites. Because of the low respiration rates and the thinness of the sediment, interstitial waters are oxic throughout the sediment column in most of this region. Consequently, the sedimentary community of the SPG is predominantly aerobic, unlike previously explored subseafloor communities. Generation of H-2 by radiolysis of water is a significant electron-donor source for this community. The per-cell respiration rates of this community are about 2 orders of magnitude higher (in oxidation/reduction equivalents) than in previously explored anaerobic subseafloor communities. Respiration rates and cell concentrations in subseafloor sediment throughout almost half of the world ocean may approach those in SPG sediment.
Y1  - 2009
UR  - http://www.pnas.org/
U6  - https://doi.org/10.1073/pnas.0811793106
SN  - 0027-8424
ER  - 
TY  - JOUR
A1  - Kallmeyer, Jens
A1  - Pockalny, Rob
A1  - D'Hondt, Steven
T1  - Quantifying global subseafloor microbial abundance : method and implications
Y1  - 2009
UR  - http://www.sciencedirect.com/science/journal/00167037
U6  - https://doi.org/10.1016/j.gca.2009.05.009
SN  - 0016-7037
ER  - 
TY  - JOUR
A1  - Roy, Hans
A1  - Kallmeyer, Jens
A1  - Adhikari, Rishi Ram
A1  - Pockalny, Robert
A1  - Jorgensen, Bo Barker
A1  - D'Hondt, Steven
T1  - Aerobic microbial respiration in 86-million-year-old deep-sea red clay
JF  - Science
N2  - Microbial communities can subsist at depth in marine sediments without fresh supply of organic matter for millions of years. At threshold sedimentation rates of 1 millimeter per 1000 years, the low rates of microbial community metabolism in the North Pacific Gyre allow sediments to remain oxygenated tens of meters below the sea floor. We found that the oxygen respiration rates dropped from 10 micromoles of O-2 liter(-1) year(-1) near the sediment-water interface to 0.001 micromoles of O-2 liter(-1) year(-1) at 30-meter depth within 86 million-year-old sediment. The cell-specific respiration rate decreased with depth but stabilized at around 10(-3) femtomoles of O-2 cell(-1) day(-1) 10 meters below the seafloor. This result indicated that the community size is controlled by the rate of carbon oxidation and thereby by the low available energy flux.
Y1  - 2012
U6  - https://doi.org/10.1126/science.1219424
SN  - 0036-8075
VL  - 336
IS  - 6083
SP  - 922
EP  - 925
PB  - American Assoc. for the Advancement of Science
CY  - Washington
ER  - 
TY  - JOUR
A1  - Kallmeyer, Jens
A1  - Pockalny, Robert
A1  - Adhikari, Rishi Ram
A1  - Smith, David C.
A1  - D'Hondt, Steven
T1  - Global distribution of microbial abundance and biomass in subseafloor sediment
JF  - Proceedings of the National Academy of Sciences of the United States of America
N2  - The global geographic distribution of subseafloor sedimentary microbes and the cause(s) of that distribution are largely unexplored. Here, we show that total microbial cell abundance in subseafloor sediment varies between sites by ca. five orders of magnitude. This variation is strongly correlated with mean sedimentation rate and distance from land. Based on these correlations, we estimate global subseafloor sedimentary microbial abundance to be 2.9 center dot 10(29) cells [corresponding to 4.1 petagram (Pg) C and similar to 0.6% of Earth's total living biomass]. This estimate of subseafloor sedimentary microbial abundance is roughly equal to previous estimates of total microbial abundance in seawater and total microbial abundance in soil. It is much lower than previous estimates of subseafloor sedimentary microbial abundance. In consequence, we estimate Earth's total number of microbes and total living biomass to be, respectively, 50-78% and 10-45% lower than previous estimates.
KW  - deep biosphere
KW  - cell enumeration
KW  - global microbial biomass
KW  - subsurface life
Y1  - 2012
U6  - https://doi.org/10.1073/pnas.1203849109
SN  - 0027-8424
VL  - 109
IS  - 40
SP  - 16213
EP  - 16216
PB  - National Acad. of Sciences
CY  - Washington
ER  - 
TY  - JOUR
A1  - Radchuk, Viktoriia
A1  - Reed, Thomas
A1  - Teplitsky, Celine
A1  - van de Pol, Martijn
A1  - Charmantier, Anne
A1  - Hassall, Christopher
A1  - Adamik, Peter
A1  - Adriaensen, Frank
A1  - Ahola, Markus P.
A1  - Arcese, Peter
A1  - Miguel Aviles, Jesus
A1  - Balbontin, Javier
A1  - Berg, Karl S.
A1  - Borras, Antoni
A1  - Burthe, Sarah
A1  - Clobert, Jean
A1  - Dehnhard, Nina
A1  - de Lope, Florentino
A1  - Dhondt, Andre A.
A1  - Dingemanse, Niels J.
A1  - Doi, Hideyuki
A1  - Eeva, Tapio
A1  - Fickel, Jörns
A1  - Filella, Iolanda
A1  - Fossoy, Frode
A1  - Goodenough, Anne E.
A1  - Hall, Stephen J. G.
A1  - Hansson, Bengt
A1  - Harris, Michael
A1  - Hasselquist, Dennis
A1  - Hickler, Thomas
A1  - Jasmin Radha, Jasmin
A1  - Kharouba, Heather
A1  - Gabriel Martinez, Juan
A1  - Mihoub, Jean-Baptiste
A1  - Mills, James A.
A1  - Molina-Morales, Mercedes
A1  - Moksnes, Arne
A1  - Ozgul, Arpat
A1  - Parejo, Deseada
A1  - Pilard, Philippe
A1  - Poisbleau, Maud
A1  - Rousset, Francois
A1  - Rödel, Mark-Oliver
A1  - Scott, David
A1  - Carlos Senar, Juan
A1  - Stefanescu, Constanti
A1  - Stokke, Bard G.
A1  - Kusano, Tamotsu
A1  - Tarka, Maja
A1  - Tarwater, Corey E.
A1  - Thonicke, Kirsten
A1  - Thorley, Jack
A1  - Wilting, Andreas
A1  - Tryjanowski, Piotr
A1  - Merila, Juha
A1  - Sheldon, Ben C.
A1  - Moller, Anders Pape
A1  - Matthysen, Erik
A1  - Janzen, Fredric
A1  - Dobson, F. Stephen
A1  - Visser, Marcel E.
A1  - Beissinger, Steven R.
A1  - Courtiol, Alexandre
A1  - Kramer-Schadt, Stephanie
T1  - Adaptive responses of animals to climate change are most likely insufficient
JF  - Nature Communications
N2  - Biological responses to climate change have been widely documented across taxa and regions, but it remains unclear whether species are maintaining a good match between phenotype and environment, i.e. whether observed trait changes are adaptive. Here we reviewed 10,090 abstracts and extracted data from 71 studies reported in 58 relevant publications, to assess quantitatively whether phenotypic trait changes associated with climate change are adaptive in animals. A meta-analysis focussing on birds, the taxon best represented in our dataset, suggests that global warming has not systematically affected morphological traits, but has advanced phenological traits. We demonstrate that these advances are adaptive for some species, but imperfect as evidenced by the observed consistent selection for earlier timing. Application of a theoretical model indicates that the evolutionary load imposed by incomplete adaptive responses to ongoing climate change may already be threatening the persistence of species.
Y1  - 2019
U6  - https://doi.org/10.1038/s41467-019-10924-4
SN  - 2041-1723
VL  - 10
PB  - Nature Publ. Group
CY  - London
ER  -