caa a22 4500 477116280 CHVBK 20180405111623.0 cr unu---uuuuu 170330e19960201xx s 000 0 eng 10.1007/BF00005229 doi (NATIONALLICENCE)springer-10.1007/BF00005229 Effects of temperature gradients resulting from reservoir discharge on Dorosoma cepedianum spawning in the Savannah River [Elektronische Daten] [Michael Paller, Bruce Saul] Synopsis: The timing and spatial pattern of gizzard shad, Dorosoma cepedianum, spawning were markedly affected by a temperature gradient caused by the release of hypolimnetic water from an upstream reservoir into the middle reaches of the Savannah River. During 1983 and 1984, a distinct thermal gradient occurred with the warmest temperatures at the downstream end of the 257 km study reach and the coolest temperatures at the upstream end. The occurrence of gizzard shad larvae indicated that spawning began at the sample stations farthest downstream and progressed upstream, peaking at each sample station when it warmed to approximately 19° C. The estimated difference in date of peak density of larvae between the upstream and downstream ends of the gradient was 23 days in 1983 and 35 days in 1984. Because of this pattern, densities of larvae were highest at the downstream end of the study area early in the spawning season and highest at the upstream end of the study area late in the spawning season. Photoperiod and daylength appeared unrelated to the patterns under study. Far-reaching effects of anthropogenic temperature changes on fish spawning and the distribution of larvae are probably common in rivers that receive hypolimnetic discharge. Kluwer Academic Publishers, 1996 Fish larvae nationallicence Hypolimnetic discharge nationallicence Distribution nationallicence Dam nationallicence Gizzard shad nationallicence Paller Michael Environmental Sciences Section, Building 773-42A, Westinghouse Savannah River Company, 29808, Aiken, SC, U.S.A. aut Saul Bruce Department of Biology, Augusta College, 2500 Walton Way, 30904-2200, Augusta, GA, U.S.A. aut Environmental Biology of Fishes Kluwer Academic Publishers 45/2(1996-02-01), 151-160 0378-1909 45:2<151 1996 45 10641 https://doi.org/10.1007/BF00005229 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00005229 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Paller Michael Environmental Sciences Section, Building 773-42A, Westinghouse Savannah River Company, 29808, Aiken, SC, U.S.A aut NATIONALLICENCE 700 1- Saul Bruce Department of Biology, Augusta College, 2500 Walton Way, 30904-2200, Augusta, GA, U.S.A aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Kluwer Academic Publishers 45/2(1996-02-01), 151-160 0378-1909 45:2<151 1996 45 10641 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer