1
|
Al-Chokhachy R, Peka R, Horgen E, Kaus DJ, Loux T, Heki L. Water availability drives instream conditions and life-history of an imperiled desert fish: A case study to inform water management. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 832:154614. [PMID: 35358530 DOI: 10.1016/j.scitotenv.2022.154614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Revised: 03/09/2022] [Accepted: 03/12/2022] [Indexed: 06/14/2023]
Abstract
In arid ecosystems, available water is a critical, yet limited resource for human consumption, agricultural use, and ecosystem processes-highlighting the importance of developing management strategies to meet the needs of multiple users. Here, we evaluated how water availability influences stream thermal regimes and life-history expressions of Lahontan cutthroat trout (Oncorhynchus clarkii henshawi) in the arid Truckee River basin in the western United States. We integrated air temperature and stream discharge data to quantify how water availability drives stream temperature during annual spawning and rearing of Lahontan cutthroat trout. We then determined how in situ stream discharge and temperature affected adult spawning migrations, juvenile growth opportunities, and duration of suitable thermal conditions. Air temperatures had significant, large effects (+) on stream temperature across months; the effects of discharge varied across months, with significant effects (-) during May through August, suggesting increased discharge can help mitigate temperatures during seasonally warm months. Two models explained adult Lahontan cutthroat trout migration, and both models indicated that adult Lahontan cutthroat trout avoid migration when temperatures are warmer (~ > 12 °C) and discharge is higher (~ > 50 m3*s-1). Juvenile size was best explained by a quadratic relationship with cumulative degree days (CDD; days>4 °C) as size increased with increasing CDDs but decreased at higher CDDs. We also found an interaction between CDDs and discharge explaining juvenile size: when CDDs were low, higher discharge was associated with larger size, but when CDDs were high, higher discharge was associated with smaller size. Stream temperatures also determined the duration of juvenile rearing, as all juvenile emigration ceased at temperatures >24.4 °C. Together, our results illustrated how stream discharge and temperature shape the life-history of Lahontan cutthroat trout at multiple stages and can inform management actions to offset warming temperatures and facilitate life-history diversity and population resilience.
Collapse
Affiliation(s)
- Robert Al-Chokhachy
- U.S. Geological Survey, Northern Rocky Mountain Science Center, 2327 University Way, Suite 2, Bozeman, MT 59715, USA.
| | - Roger Peka
- U.S. Fish and Wildlife Service, Lahontan National Fish Hatchery Complex, 1340 Financial Blvd., Suite 161, Reno, NV 89502, USA
| | - Erik Horgen
- U.S. Fish and Wildlife Service, Lahontan National Fish Hatchery Complex, 1340 Financial Blvd., Suite 161, Reno, NV 89502, USA
| | - Daniel J Kaus
- U.S. Fish and Wildlife Service, Lahontan National Fish Hatchery Complex, 1340 Financial Blvd., Suite 161, Reno, NV 89502, USA
| | - Tim Loux
- U.S. Fish and Wildlife Service, Lahontan National Fish Hatchery Complex, 1340 Financial Blvd., Suite 161, Reno, NV 89502, USA
| | - Lisa Heki
- U.S. Fish and Wildlife Service, Lahontan National Fish Hatchery Complex, 1340 Financial Blvd., Suite 161, Reno, NV 89502, USA
| |
Collapse
|
2
|
Pfauserová N, Brabec M, Slavík O, Horký P, Žlábek V, Hladík M. Effects of physical parameters on fish migration between a reservoir and its tributaries. Sci Rep 2022; 12:8612. [PMID: 35606377 PMCID: PMC9126976 DOI: 10.1038/s41598-022-12231-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 04/26/2022] [Indexed: 11/09/2022] Open
Abstract
Reservoirs interrupt natural riverine continuity, reduce the overall diversity of the environment, and enhance the spread of non-native fish species through suitable environments. Under favourable conditions, invasive species migrate to tributaries to benefit from local resource supplies. However, the changes in physical conditions in reservoirs that motivate fish species to migrate remain poorly understood. We analysed migration between a reservoir and its tributary in three non-native (asp Leuciscus aspius, ide Leuciscus idus, and bream Abramis brama) and two native (chub Squalius cephalus and pike Esox lucius) species equipped with radio tags. This 5-year study revealed that an increasing day length was the most general predictor of migration into the tributary in all observed species except E. lucius. Only L. aspius responded to the substantially increasing water level in the reservoir, while the migration of L. idus and S. cephalus was attenuated. Abramis brama and S. cephalus occurred more frequently in tributaries with an increase in temperature in the reservoir and vice versa, but if the difference in temperature between the reservoir and its tributary was small, then A. brama did not migrate. Our results showed that migration from the reservoir mainly followed the alterations of daylight, while responses to other parameters were species specific. The interindividual heterogeneity within the species was significant and was not caused by differences in length or sex. Our results contribute to the knowledge of how reservoirs can affect the spread of non-native species that adapt to rapid human-induced environmental changes.
Collapse
Affiliation(s)
- Nikola Pfauserová
- Department of Zoology and Fisheries, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, Suchdol, Prague 620, 165 21, Czech Republic.
| | - Marek Brabec
- Institute of Computer Science, The Czech Academy of Sciences, Prague, Czech Republic
| | - Ondřej Slavík
- Department of Zoology and Fisheries, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, Suchdol, Prague 620, 165 21, Czech Republic
| | - Pavel Horký
- Department of Zoology and Fisheries, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, Suchdol, Prague 620, 165 21, Czech Republic
| | - Vladimír Žlábek
- Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia in České Budějovice, České Budějovice, Czech Republic
| | - Milan Hladík
- Department of Water Management Planning and Conceptions, Water Management Development and Construction Joint Stock Company (VRV a.s.), Prague, Czech Republic
| |
Collapse
|
3
|
Key Factors for the Findability of Fish Passes in Large Epipotamal Rivers: The Case of the River Drava. WATER 2022. [DOI: 10.3390/w14101530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Restoring the longitudinal connectivity of rivers through fish passes is of great importance for achieving good ecological status of surface waters. However, the key stimuli determining the findability of the entrance of these structures is still subject to debate. In this article, the influence of water temperature, light and acoustic stimuli in addition to flow parameters on fish movement is assessed. Analyses are based on a comprehensive dataset of 40,000 fish migrations covering time accurate recording of ascending individuals during the observation periods from 2015 to 2020 in various fish passes on the river Drava in Carinthia, Austria. The data are assessed by technical, fish ecological and statistical methods. Results indicate that the effect of the water temperature gradient between the fish pass and the main river has most impact on the ascent rates, whereas the two factors of light and acoustic, as well as most of the flow parameters, have no or negligible effect on the findability. A favourable thermal environment can be important to ensure efficient upstream migration and thus facilitate the findability of fish passes.
Collapse
|
4
|
A riverscape approach reveals downstream propagation of stream thermal responses to riparian thinning at multiple scales. Ecosphere 2021. [DOI: 10.1002/ecs2.3775] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|