A lake as a microcosm: reflections on developments in aquatic ecology

Hansson, Lars‐Anders; Brodersen, Jakob; Chapman, Ben B.; Ekvall, Mattias K.; Hargeby, Anders; Nicolle, Alice; Nilsson, P. Anders; Skov, Christian; Brönmark, Christer

doi:10.1007/s10452-013-9435-2

Cited by 10 publications

(10 citation statements)

References 72 publications

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“…The study was conducted in Lake Kranksjön situated in southern Sweden (55°42′N, 13°28′E), approximately 20 km east of the city of Lund. The lake has a surface area of 3.4 km 2 , a mean depth of 0.7 m, a maximum depth of 3.0 m, is macrophyte rich (mainly Charophytes), and moderately eutrophic 28 , 29 . Gillnet surveys have shown that roach ( Rutilus rutilus ) numerically dominate the fish assemblage in the lake.…”

Section: Methodsmentioning

confidence: 99%

A predation cost to bold fish in the wild

Hulthén

Chapman

Nilsson

et al. 2017

Sci Rep

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Studies of predator-mediated selection on behaviour are critical for our understanding of the evolution and maintenance of behavioural diversity in natural populations. Consistent individual differences in prey behaviour, especially in the propensity to take risks (“boldness”), are widespread in the animal kingdom. Theory predicts that individual behavioural types differ in a cost-benefit trade-off where bolder individuals benefit from greater access to resources while paying higher predation-risk costs. However, explicitly linking predation events to individual behaviour under natural conditions is challenging and there is currently little data from the wild. We assayed individual behaviour and electronically tagged hundreds of fish (roach, Rutilus rutilus) before releasing them into their lake of origin, thereby exposing them to predation risk from avian apex predators (cormorants, Phalacrocorax carbo). Scanning for regurgitated tags at the cormorant roosting site provided data on individual predation events. We found that fish with higher boldness have a greater susceptibility to cormorant predation compared to relatively shy, risk-averse individuals. Our findings hereby provide unique and direct evidence of behavioural type-dependent predation vulnerability in the wild, i.e. that there is a predation cost to boldness, which is critical for our understanding of the evolution and maintenance of behavioural diversity in natural populations.

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Section: Methodsmentioning

confidence: 99%

A predation cost to bold fish in the wild

Hulthén

Chapman

Nilsson

et al. 2017

Sci Rep

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“…To the best of our knowledge, biomanipulation projects involving several neighbouring lakes in a watercourse at the same time are very rare or even nonexistent. Likewise, lakes have previously been viewed as isolated ecosystems (Forbes, ; Hansson et al, ). Many lakes are, however, interconnected through inlet and outlet streams, allowing ecologically significant fish movements between lakes (Daniels, Morse, Sutherland, Bombard, & Boylen, ), with potential consequences for trophic interactions and ecosystem stability.…”

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Partial nomadism in large‐bodied bream (Abramis brama)

Brodersen

Hansen

Skov

2019

Ecology of Freshwater Fish

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The recent focus on a common movement ecology paradigm has increased awareness about the importance of distinguishing different movement patterns for understanding their specific impact on animal ecology and evolution. One specific form of movement is nomadism, where animals move between habitats in an arrhythmic fashion. Although not yet described in detail for freshwater fish, nomadism between lakes within drainage systems could affect local lake food webs in an otherwise unpredictable fashion. In this study, we used passive telemetry to describe inter‐lake movements of 1,280 individually tagged adult benthivorous bream (Abramis brama) over nine contiguous years in a drainage system with two paired lakes. The movements can best be described as partial nomadism, where a part of the population is neither resident nor migratory, but instead moves between lakes in a variable, arrhythmic fashion, often with long residency in one lake before moving to the other. We found extensive between‐year variation in the proportion and direction of bream moving, with higher movement propensity being partly associated with lower somatic condition. Notably, movements out of lakes were significantly more in direction of the neighbouring lake than away from the paired lakes, suggesting that at least direction was not random. Since bream are important ecosystem engineers, fluctuating densities of adult bream could affect ecological stability in lakes. Our study suggests that fish populations in interconnected lakes within drainages should not be treated as isolated units, and we discuss this in relation to lake ecology and the importance for lake ecosystem management.

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“…and the western and south-eastern parts are fringed by extensive beds of reed (Phragmites australis cav. [Hansson et al, 2013]).…”

Section: Study Systemsmentioning

confidence: 99%

Timing and synchrony of migration in a freshwater fish: Consequences for survival

Chapman

Nilsson

Hansson

et al. 2022

Journal of Animal Ecology

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1. Animal migration is one of the most spectacular and visible behavioural phenomena in nature with profound implications for a range of ecological and evolutionary processes. Successful migration hinges on the ability to exploit temporary resources (e.g. food) and evade threats (e.g. predators) as they arise, and thus the timing of migration is often regarded as a dominant predictor of individual migratory success.2. However, with the exception of intensively studied taxa (mainly birds), relatively few studies have investigated inter-individual annual and seasonal variation in migratory timing and performance, or tested predictions on how migration across high and low predation-risk habitats may exert selection on migratory timing. In particular, studies that assess the survival consequences of variation in migratory timing remain rare, which is most likely due to the logistical challenges associated with monitoring survival success and population-level characteristics simultaneously.3. Here, we address the above-mentioned questions using roach Rutilus rutilus, a fish that migrates from lakes characterised by high predation risk into low-risk streams during winter. Specifically, we used individual-based tracking of roach in two European lake systems over multiple migration periods (9 and 7 years respectively), to obtain highly detailed (year-round scheduling, repeat journeys and the fate of individuals) data on the variability/synchrony of migratory timing in spring and autumn respectively. 4. We report seasonal differences in the variability of migratory timing, with lower variance and higher migration synchrony in spring lake arrival timing as compared to autumn lake departure timing. Furthermore, the timing of autumn migration is more variable across years than the timing of spring migration. Second, we find that later arrival to the lake habitat is positively associated with apparent survival from 1 year to the next, whereas we found no effect of lake departure timing on survival probability. These findings represent rare evidence showing how intraspecific variation in timing in migratory fish differs across years and seasons, and how variation inThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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A lake as a microcosm: reflections on developments in aquatic ecology

Cited by 10 publications

References 72 publications

A predation cost to bold fish in the wild

A predation cost to bold fish in the wild

Partial nomadism in large‐bodied bream (Abramis brama)

Timing and synchrony of migration in a freshwater fish: Consequences for survival

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