caa a22 4500 445891149 CHVBK 20180317145616.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s10750-011-0750-0 doi (NATIONALLICENCE)springer-10.1007/s10750-011-0750-0 Response of two-spined blackfish Gadopsis bispinosus to short-term flow fluctuations in an upland Australian stream [Elektronische Daten] [B. Broadhurst, J. Dyer, B. Ebner, J. Thiem, P. Pridmore] Environmental flows are applied to regulated rivers, predominantly with the aim of benefiting native fauna. However, the outcomes for biodiversity and the mechanisms that underpin changes due to these manipulations are poorly understood. We examined the effects of elevated water release, of the magnitude used for riffle maintenance, on the movement and habitat use of the locally-threatened two-spined blackfish, Gadopsis bispinosus, in the Cotter River, a regulated upland stream in south-eastern Australia. We compared the behaviour of radio-tagged individuals during baseline flow conditions (0.12m3s−1) and during elevated flow releases (1.74m3s−1). Eight individuals (196±8mm TL) were radio-tracked at one site over 22days, and six individuals (180±5mm TL) were monitored by fixed telemetry stations at a second site for 1month. At both the sites, two-spined blackfish were nocturnal and occupied small linear ranges (23±6m). They preferentially used pools, but also used runs and riffles. Elevated discharge did not significantly affect movement, activity or dispersal of two-spined blackfish. Two individuals utilised inundated vegetation during high flow. Despite a small number of behavioural changes, there was no response to elevated flow at the population level. It is likely that the benthic nature of this species precludes its behaviour being affected by a 15-fold increase in-stream discharge. However, the indirect effects of flows of this magnitude on two-spined blackfish, and their responses to discharges of greater magnitude, remain to be investigated. Springer Science+Business Media B.V., 2011 Environmental flows nationallicence Flow response nationallicence Gadopsis bispinosus nationallicence Radio-telemetry nationallicence Home-range nationallicence Diel activity nationallicence Broadhurst B. Parks, Conservation & Lands, Territory & Municipal Services, GPO Box 158, 2601, Canberra, ACT, Australia aut Dyer J. Department of Environmental Management and Ecology, La Trobe University, 3690, Wodonga, VIC, Australia aut Ebner B. Parks, Conservation & Lands, Territory & Municipal Services, GPO Box 158, 2601, Canberra, ACT, Australia aut Thiem J. Parks, Conservation & Lands, Territory & Municipal Services, GPO Box 158, 2601, Canberra, ACT, Australia aut Pridmore P. Department of Environmental Management and Ecology, La Trobe University, 3690, Wodonga, VIC, Australia aut Hydrobiologia Springer Netherlands 673/1(2011-09-01), 63-77 0018-8158 673:1<63 2011 673 10750 https://doi.org/10.1007/s10750-011-0750-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0750-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Broadhurst B. Parks, Conservation & Lands, Territory & Municipal Services, GPO Box 158, 2601, Canberra, ACT, Australia aut NATIONALLICENCE 700 1- Dyer J. Department of Environmental Management and Ecology, La Trobe University, 3690, Wodonga, VIC, Australia aut NATIONALLICENCE 700 1- Ebner B. Parks, Conservation & Lands, Territory & Municipal Services, GPO Box 158, 2601, Canberra, ACT, Australia aut NATIONALLICENCE 700 1- Thiem J. Parks, Conservation & Lands, Territory & Municipal Services, GPO Box 158, 2601, Canberra, ACT, Australia aut NATIONALLICENCE 700 1- Pridmore P. Department of Environmental Management and Ecology, La Trobe University, 3690, Wodonga, VIC, Australia aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 673/1(2011-09-01), 63-77 0018-8158 673:1<63 2011 673 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer