Reversible orientational melting in solution of helical polypeptide

Баранов, В. Г.; Frenkel, S.Ya.; Zhu-Chan, Bi; Volkov, T.I.

doi:10.1016/0032-3950(66)90220-6

Cited by 5 publications

(2 citation statements)

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“…First, by examining nearly 170 recruitment and adult abundance time series from 9 reservoirs and 19 species, we found good support for the trophic surge hypothesis, mainly for the non-equilibrium phase in the early years following impoundment ( i.e . trophic surge followed by a depression phase; Baranov 1966; Kimmel and Groeger 1986; Straškraba et al . 1993).…”

Section: Discussionmentioning

confidence: 99%

“…To understand and draw generality about the effects of impoundment on fish population dynamics, scientists proposed the “trophic surge hypothesis”. In its early development, this hypothesis described and made predictions about how the increase in phosphorus loading in response to leaching and decomposition of organic matter from inundated terrestrial vegetation and soils would affect productivity in reservoirs over time (Baranov 1966; Ostrofsky 1978; Ostrofsky and Duthie 1980; Grimard and Jones 1982; Straškraba et al . 1993).…”

Section: Introductionmentioning

confidence: 99%

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Fish population dynamics and diversity in boreal and temperate reservoirs: A quantitative synthesis

Turgeon

Solomon

Nozais

et al. 2015

Preprint

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River impoundments are commonly cited as key disturbances to freshwater aquatic ecosystems. Dams alter natural hydrological regimes, homogenize river system dynamics at a global scale, can act as barriers for migratory species and may facilitate species invasions. In this synthesis, we examined the short- and long-term effects of impoundment on fish population dynamics and community structure. At the population level, we tested the "trophic surge hypothesis", which predicts a hump-shaped response of fish abundance through time after impoundment. We tested the hypothesis on 40 recruitment time series and 125 adult abundance time series from 19 species and nine reservoirs distributed in temperate and boreal regions. At the community level, we compared diversity metrics (richness, evenness, diversity) on two datasets: 1) between reservoirs and reference ecosystems (lakes, rivers, and streams) and 2) over time (before and after impoundment and over time). At the population level, the trophic surge hypothesis was supported in more than 55% of the time series but we observed significant variation across species, reservoirs and regions. Fish recruitment increased substantially during reservoir filling and shortly after impoundment, and was usually followed by an increase in adult fish. The surge was transient and vanished after 3-4 years for recruits and after 10 years for adults. However, we are lacking long time series to conclude about population patterns in the trophic equilibrium phase. At the community level, we did not find any strong directional patterns in species diversity metrics when comparing reservoirs to reference lakes but found higher diversity and evenness in reservoirs and impounded streams/rivers relative to unimpounded streams/rivers. We did not find directional patterns when looking at a change over time. Variability in the reported diversity results across studies may be related to the ability to tease apart the unique effects of impoundment and water regulation from other stressors such as propagule pressure and eutrophication, as well as the comparability of the reference system. In conclusion, fish populations benefited quickly but transiently from impoundment, and longer time series are needed to conclude about population dynamics and equilibrium in aging reservoirs in order to develop management recommendations.

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Section: Discussionmentioning

confidence: 99%