Comparison of the propensity to drift for three invertebrate taxa: a laboratory study

Arevalo, Elorri; Larrañaga, Aitor; Lang, Margaret; Prévost, Étienne; Bardonnet, Agnès

doi:10.1007/s10750-018-3870-y

Cited by 2 publications

(2 citation statements)

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“…After hydrological disturbances, Simuliidae and Chironomidae are pioneers (Otermin, Basaguren, & Pozo, 2002), because their short life cycles allow them to proliferate quickly. Large invertebrates are more vulnerable to an increase in water velocity (Arevalo et al, 2019), so it is also possible that the flood eliminated highly competitive or predatory species of invertebrates as suggested by Milner et al (2018), increasing the carrying capacity for Chironomidae (Connell, 1978). We showed that the occurrence of a flood in late spring significantly decreased young trout survival probably through a diminution in invertebrate abundance.…”

Section: Discussionmentioning

confidence: 99%

“…Even moderate floods can have important consequences on invertebrate abundance and diversity, leading to 90% and 25% reduction respectively (Theodoropoulos, Vourka, Stamou, Rutschmann, & Skoulikidis, 2017). Chironomidae and Baetidae, which can amass more than 90% of the diet for drift‐feeding young salmonids (Elliott, 1967; Sánchez‐Hernández, Vieira‐Lanero, Servia, & Cobo, 2011), are very sensitive to an increase in water velocity (Arevalo, Larrañaga, Lang, Prevost, & Bardonnet, 2019) and are prone to be washed out during floods (Imbert & Perry, 2000; Kennedy et al, 2014; Robinson, Uehlinger, & Monaghan, 2004). As such, the increase in water velocity in association with more frequent and intense floods due to climate change (van Vliet, Ludwig, Zwolsman, Weedon, & Kabat, 2011) may result in a reduction in prey availability for alevins or in a delay in peak prey abundance.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of food availability and performances of first‐feeding alevins through spring with the occurrence of a flood

Arevalo

Larrañaga²,

Bardonnet

2020

Ecology of Freshwater Fish

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Climate change will increase the temperature of rivers and will lead to more extreme events, such as floods. Temperature increases and floods will likely alter the phenology of freshwater species differently and have the potential to significantly disturb prey–predator interactions. In spring, an increase in temperature triggers an increase in primary production and controls the timing of the emergence in brown trout (Salmo trutta L.). Hydrology regulates the abundance of invertebrates, which are the main food source for newborn alevins. As such, climate change may desynchronise the relationship between fish emergence and invertebrate production, resulting in a negative impact on the performance of newly emerged alevins. In the present study, we quantified the abundance of invertebrates and the performance (survival and growth) of newborn alevins in early spring (March) compared to late spring (April/May) in 8 enclosures in a semi‐natural channel. In addition, we simulated a flood in 4 enclosures in late spring. Our results revealed that survival and growth of alevins in early spring were limited due to low invertebrate abundance. In late spring, there was a decrease in the survival of alevins placed in the flooded enclosures, likely due to the reduction of food availability. However, the growth of survivors increased, probably because of the increase in the abundance of Chironomidae after the flood and a reduced competition between congeners. Our results demonstrate that when emergence and flooding happen simultaneously, they can limit resources which will impact the survival and growth of young salmonids in running waters.

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Section: Discussionmentioning

confidence: 99%