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| Titel |
Illustrating a new global-scale approach to estimating potential reduction in fish species richness due to flow alteration |
| VerfasserIn |
S. Yoshikawa, A. Yanagawa, Y. Iwasaki, P. Sui, S. Koirala, K. Hirano, A. Khajuria, R. Mahendran, Y. Hirabayashi, C. Yoshimura, S. Kanae |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 2 ; Nr. 18, no. 2 (2014-02-19), S.621-630 |
| Datensatznummer |
250120281
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| Publikation (Nr.) |
 copernicus.org/hess-18-621-2014.pdf |
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| Zusammenfassung |
| Changes in river discharge due to human activities and climate change would
affect the sustainability of freshwater ecosystems. To globally assess how
changes in river discharge will affect the future status of freshwater
ecosystems, global-scale hydrological simulations need to be connected with
a model to estimate the durability of freshwater ecosystems. However, the
development of this specific modelling combination for the global scale is
still in its infancy. In this study, two statistical methods are introduced
to link flow regimes to fish species richness (FSR): one is based on a
linear relationship between FSR and mean river discharge (hereafter, FSR-MAD
method), and the other is based on a multi-linear relationship between FSR
and ecologically relevant flow indices involving several other flow
characteristics and mean river discharge (FSR-FLVAR method). The FSR-MAD
method has been used previously in global simulation studies. The FSR-FLVAR
method is newly introduced here. These statistical methods for estimating
FSR were combined with a set of global river discharge simulations to
evaluate the potential impact of climate-change-induced flow alterations on
FSR changes. Generally, future reductions in FSR with the FSR-FLVAR method
are greater and much more scattered than with the FSR-MAD method. In arid
regions, both methods indicate reductions in FSR because mean discharge is
projected to decrease from past to future, although the magnitude of
reductions in FSR is different between the two methods. In contrast, in
heavy-snow regions a large reduction in FSR is shown by the FSR-FLVAR method
due to increases in the frequency of low and high flows. Although further
research is clearly needed to conclude which method is more appropriate,
this study demonstrates that the FSR-FLVAR method could produce considerably
different results when assessing the global role of flow alterations in
changing freshwater ecosystems. |
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