High sediment temperatures influence the emergence of dormant aquatic biota
Under the influence of increasing air temperatures, dormant seeds of wetland plants and eggs of microfauna may be subjected to increased sediment temperatures that adversely affect their capacity to germinate or hatch, while the wetland is in its ‘dry’ phase. We conducted a mesocosm experiment to in...
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Published in | Marine and freshwater research Vol. 66; no. 12; pp. 1138 - 1146 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
CSIRO Publishing
01.01.2015
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Abstract | Under the influence of increasing air temperatures, dormant seeds of wetland plants and eggs of microfauna may be subjected to increased sediment temperatures that adversely affect their capacity to germinate or hatch, while the wetland is in its ‘dry’ phase. We conducted a mesocosm experiment to investigate the influence of sediment temperature on the emergence capacity of dormant seeds and eggs. Dry wetland sediment was exposed to temperatures ranging from –180 to 150°C. After re-wetting, the taxon richness and abundance of communities that developed were assessed. Both aquatic plants and microfauna emerged from the seed bank at sediment temperatures lower than 50°C. However, the composition of the microfaunal community was altered once temperatures exceeded 40°C and germination of aquatic plants ceased once temperatures exceeded 50°C. These results suggest that changes to sediment temperature during the dry phase of wetlands may play an important role in influencing communities of wetland aquatic plants and microfauna. Modelled sediment temperature data indicated that minimum sediment temperature could exceed 40°C for extended periods of time under existing climate-change scenarios by 2070. An increase in the occurrence and duration of such temperatures may threaten the abundance and diversity of wetland microfauna and aquatic-plant communities. |
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AbstractList | Under the influence of increasing air temperatures, dormant seeds of wetland plants and eggs of microfauna may be subjected to increased sediment temperatures that adversely affect their capacity to germinate or hatch, while the wetland is in its ‘dry’ phase. We conducted a mesocosm experiment to investigate the influence of sediment temperature on the emergence capacity of dormant seeds and eggs. Dry wetland sediment was exposed to temperatures ranging from –180 to 150°C. After re-wetting, the taxon richness and abundance of communities that developed were assessed. Both aquatic plants and microfauna emerged from the seed bank at sediment temperatures lower than 50°C. However, the composition of the microfaunal community was altered once temperatures exceeded 40°C and germination of aquatic plants ceased once temperatures exceeded 50°C. These results suggest that changes to sediment temperature during the dry phase of wetlands may play an important role in influencing communities of wetland aquatic plants and microfauna. Modelled sediment temperature data indicated that minimum sediment temperature could exceed 40°C for extended periods of time under existing climate-change scenarios by 2070. An increase in the occurrence and duration of such temperatures may threaten the abundance and diversity of wetland microfauna and aquatic-plant communities. |
Author | Jasper, Elke Walburga Lawler, Susan Ning, Nathan Nielsen, Daryl L |
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CitedBy_id | crossref_primary_10_1007_s00442_017_3858_8 crossref_primary_10_1007_s10750_021_04743_2 crossref_primary_10_1017_S0960258519000187 crossref_primary_10_1111_1440_1703_12213 crossref_primary_10_1016_j_limno_2018_04_003 crossref_primary_10_3389_fmicb_2024_1397683 crossref_primary_10_1186_s12898_018_0158_z crossref_primary_10_1007_s10750_016_3006_1 |
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Title | High sediment temperatures influence the emergence of dormant aquatic biota |
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