Winter Disturbances and Riverine Fish in Temperate and Cold Regions

Weber, Christine; Nilsson, Christer; Lind, Lovisa; Alfredsen, Knut; Polvi, Lina E.

doi:10.1525/bio.2013.63.3.8

Cited by 40 publications

(49 citation statements)

References 53 publications

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“…In subarctic regions of the world, seasonal weather fluctuations create extreme environmental conditions that shape riverine habitats and regulate aquatic communities (Resh et al, 1988;Weber, Nilsson, Lind, Alfredsen, & Polvi, 2013). To survive, resident species must endure prolonged minimal water temperatures, complete river ice coverage, reduced light and food availabilities and major flood events (Brown, Hubert, & Daly, 2011;Power, Cunjak, Flannagan, & Katopodis, 1993).…”

Section: Introductionmentioning

confidence: 99%

Migration and movement profiles of a potadromous fish (Brachymystax lenok Pallas 1773) in a highly connected river system (Mongolia)

Kaus

Büttner

Karthe

et al. 2017

Ecology of Freshwater Fish

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Understanding a species' spatial and temporal movements along with the way these shift under extreme environmental conditions is vital for developing scientifically sound conservation and management strategies. The aim of this research was to describe and quantify the seasonal migration patterns and fine-scale movement profiles of Brachymystax lenok, a threatened, potadromous salmonid that inhabits the highly connected, boreal river basins of Siberia and northern Asia. During this study 21 mature individuals were monitored over a 15 month period in the upper Eroo River basin, Mongolia, using passive acoustic telemetry. Mean (±SD) B. lenok home ranges were 19.1 ± 15.1 km (median = 11.5 km), with maximum longitudinal movements detected > 45.3 km. Two periods of increased movements were identified; the first in late summer/early autumn when 10 B. lenok moved into deeper, overwintering pools, with the second period occurring in late spring and early summer when nine B. lenok were detected entering the surrounding tributaries. Diel activity and depth typically increased during daylight hours followed by decreased activity or resting periods in shallower river sections at night. These results highlight the need to maintain a high level of river connectivity and adequate fishing season closures by implementing and enforcing an expansive spatiotemporal management plan that can better protect and recover the Mongolian B. lenok populations. Such measures should be transferable to other threatened, potadromous fish species residing throughout the world's boreal river basins. K E Y W O R D S acoustic telemetry, Brachymystax lenok, Mongolian fish fauna, potadromous fish, seasonal movements, spatial ecology

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Section: Introductionmentioning

confidence: 99%

Migration and movement profiles of a potadromous fish (Brachymystax lenok Pallas 1773) in a highly connected river system (Mongolia)

Kaus

Büttner

Karthe

et al. 2017

Ecology of Freshwater Fish

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“…This may impact infrastructure and the organisms living near or in streams and rivers (Prowse & Beltaos, 2002). Today, there is a growing research interest in ice in flowing waters because climate change effects on ice may have large economic and ecological consequences (Beltaos & Burrell, 2003;Weber et al, 2013). These consequences may be most pronounced in large rivers where both the duration and the magnitude of floods are higher and thus also the effects on vegetation (Sigafoos, 1964).…”

Section: Introductionmentioning

confidence: 99%

The role of ice dynamics in shaping vegetation in flowing waters

et al. 2014

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Ice dynamics is an important factor affecting vegetation in high-altitude and high-latitude streams and rivers. During the last few decades, knowledge about ice in streams and rivers has increased significantly and a respectable body of literature is now available. Here we review the literature on how ice dynamics influence riparian and aquatic vegetation. Traditionally, plant ecologists have focused their studies on the summer period, largely ignoring the fact that processes during winter also impact vegetation dynamics. For example, the freeze-up period in early winter may result in extensive formation of underwater ice that can restructure the channel, obstruct flow, and cause flooding and thus formation of more ice. In midwinter, slow-flowing reaches develop a surface-ice cover that accumulates snow, protecting habitats under the ice from formation of underwater ice but also reducing underwater light, thus suppressing photosynthesis. Towards the end of winter, ice breaks up and moves downstream. During this transport, ice floes can jam up and cause floods and major erosion. The magnitudes of the floods and their erosive power mainly depend on the size of the watercourse, also resulting in different degrees of disturbance to the vegetation. Vegetation responds both physically and physiologically to ice dynamics. Physical action involves the erosive force of moving ice and damage caused by ground frost, whereas physiological effects - mostly cell damage - happen as a result of plants freezing into the ice. On a community level, large magnitudes of ice dynamics seem to favour species richness, but can be detrimental for individual plants. Human impacts, such as flow regulation, channelisation, agriculturalisation and water pollution have modified ice dynamics; further changes are expected as a result of current and predicted future climate change. Human impacts and climate change can both favour and disfavour riverine vegetation dynamics. Restoration of streams and rivers may mitigate some effects of anticipated climate change on ice and vegetation dynamics by, for example, slowing down flows and increasing water depth, thus reducing the potential for massive formation of underwater ice.

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“…Framstad et al (2006) add that ice cover on rivers protects young salmon during winter, and a reduction of ice cover may thus be expected to be negative. Temperature variation during winter may also increase the formation of frazil ice and anchor ice that can kill juveniles during winter (Weber et al 2013). …”

Section: Meat and Fish Productionmentioning

confidence: 99%

Future changes in the supply of goods and services from natural ecosystems: prospects for the European north

Jansson¹,

Keskitalo²,

Vlasova³

et al. 2015

E&S

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Aspholm. 2015. Future changes in the supply of goods and services from natural ecosystems: prospects for the European north. ABSTRACT. Humans depend on services provided by ecosystems, and how services are affected by climate change is increasingly studied. Few studies, however, address changes likely to affect services from seminatural ecosystems. We analyzed ecosystem goods and services in natural and seminatural systems, specifically how they are expected to change as a result of projected climate change during the 21st century. We selected terrestrial and freshwater systems in northernmost Europe, where climate is anticipated to change more than the global average, and identified likely changes in ecosystem services and their societal consequences. We did this by assembling experts from ecology, social science, and cultural geography in workshops, and we also performed a literature review. Results show that most ecosystem services are affected by multiple factors, often acting in opposite directions. Out of 14 services considered, 8 are expected to increase or remain relatively unchanged in supply, and 6 are expected to decrease. Although we do not predict collapse or disappearance of any of the investigated services, the effects of climate change in conjunction with potential economical and societal changes may exceed the adaptive capacity of societies. This may result in societal reorganization and changes in ways that ecosystems are used. Significant uncertainties and knowledge gaps in the forecast make specific conclusions about societal responses to safeguard human well-being questionable. Adapting to changes in ecosystem services will therefore require consideration of uncertainties and complexities in both social and ecological responses. The scenarios presented here provide a framework for future studies exploring such issues.

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Winter Disturbances and Riverine Fish in Temperate and Cold Regions

Cited by 40 publications

References 53 publications

Migration and movement profiles of a potadromous fish (Brachymystax lenok Pallas 1773) in a highly connected river system (Mongolia)

Migration and movement profiles of a potadromous fish (Brachymystax lenok Pallas 1773) in a highly connected river system (Mongolia)

The role of ice dynamics in shaping vegetation in flowing waters

Future changes in the supply of goods and services from natural ecosystems: prospects for the European north

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