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Your search keyword '"Nooten, Sabine S."' showing total 26 results
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4. The heat is on: reduced detection of floral scents after heatwaves in bumblebees.

Author

Nooten, Sabine S., Korten, Hanno, Schmitt, Thomas, and Kárpáti, Zsolt

Subjects
*BOMBUS terrestris, *CLIMATE change, *HEAT waves (Meteorology), *BUMBLEBEES, *ECOSYSTEM services, *POLLINATORS, *POLLINATION
Abstract

Global climate change disrupts key ecological processes and biotic interactions. The recent increase in heatwave frequency and severity prompts the evaluation of physiological processes that ensure the maintenance of vital ecosystem services such as pollination. We used experimental heatwaves to determine how high temperatures affect the bumblebees' ability to detect floral scents. Heatwaves induced strong reductions in antennal responses to floral scents in both tested bumblebee species (Bombus terrestris and Bombus pascuorum). These reductions were generally stronger in workers than in males. Bumblebees showed no consistent pattern of recovery 24 h after heat events. Our results suggest that the projected increased frequency and severity of heatwaves may jeopardize bumblebee-mediated pollination services by disrupting the chemical communication between plants and pollinators. The reduced chemosensitivity can decrease the bumblebees' abilities to locate food sources and lead to declines in colonies and populations. [ABSTRACT FROM AUTHOR]

Published
2024
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16. The impact of elevated CO2 and silicon fertilisation on ant–aphid mutualisms: turning bodyguards into assassins?

Author

Jenni. M.M. Kremer, Nooten, Sabine S., Cook, James M., and Johnson, Scott N.

Abstract

Kremer, J.M.M., Nooten, S.S., Cook, J.M. & Johnson, S.N. (2017) The impact of elevated CO2 and silicon fertilisation on ant–aphid mutualisms: turning bodyguards into assassins? In Invertebrate Ecology of Australasian Grasslands. Proceedings of the Ninth ACGIE (ed S.N. Johnson), pp. 120-122. Western Sydney University, Hawkesbury, NSW, Australia.

Published
2017
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17. Atmospheric change causes declines in woodland arthropods and impacts specific trophic groups

Author

Facey, Sarah L., Fidler, David B., Rowe, Rhiannon C., Bromfield, Lisa M., Nooten, Sabine S., Staley, Joanna T., Ellsworth, David S., Johnson, Scott N., Facey, Sarah L., Fidler, David B., Rowe, Rhiannon C., Bromfield, Lisa M., Nooten, Sabine S., Staley, Joanna T., Ellsworth, David S., and Johnson, Scott N.

Abstract

1. Arthropod assemblages form a fundamental part of terrestrial ecosystems, underpinning ecosystem processes and services. Yet, little is known about how invertebrate communities, as a whole, respond to climatic and atmospheric changes, including predicted increases in carbon dioxide concentrations (CO2). 2. To date, woodland Free Air CO2 Enrichment (FACE) studies have focused entirely on northern hemisphere managed plantations. We manipulated atmospheric CO2 in a mature, native Eucalyptus woodland (0.15 ha, >32 000 m3) in Australia, using the Eucalyptus FACE (‘EucFACE’) facility. We used three complementary sampling methods (vacuum sampling, pitfall and sticky trapping) to record invertebrate abundances under ambient and elevated levels of CO2 (400 versus 550 ppm). 3. Based on the collection of over 83 000 invertebrates, we found significant declines in the overall abundance of ground-dwelling (14.7%) and aerial (12.9%) arthropods under elevated CO2, with significant decreases in herbivore, omnivore, scavenger and parasitoid functional groups. Even though several groups showed varying declines in abundance, elevated CO2 did not measurably affect community composition. 4. The results of the present study indicate that atmospheric CO2 levels predicted within the next 35 years may cause declines in arthropod abundances in Eucalyptus woodland. Declines found in several functional groups suggest that elevated atmospheric CO2 has the potential to affect ecosystem processes, possibly including nutrient cycling by herbivores and omnivores, as well as biocontrol by parasitoids.

Published
2017

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