Spring temperature predicts upstream migration timing of invasive Sacramento pikeminnow within its introduced range DOI Creative Commons
Philip B. Georgakakos, David Dralle, Mary E. Power

et al.

Environmental Biology of Fishes, Journal Year: 2023, Volume and Issue: 106(11), P. 2069 - 2082

Published: Nov. 1, 2023

Abstract Rapid climate change and invasive species introductions threaten ecological communities across the globe. Freshwaters are particularly vulnerable impacted, especially when these stresses coincide. We document migration of an piscine predator, Sacramento pikeminnow ( Ptychocheilus grandis ), within its introduced range, South Fork Eel River, California, USA. Snorkel surveys temperature monitoring in 2015–2019 showed that migrate upstream during spring early summer, with earlier warmer years. developed a statistical model to forecast timing extent by under varying combinations discharge air temperature. Modeled river increased downstream decreased discharge. In years low high temperature, we predict will move earlier, increasing spatial temporal overlap their summer range native fishes. Managing conditions reduce co-occurrence fishes (i.e., decreasing temperature) could increase amount duration predator-free habitat for have larger impacts on invaded riverine global warming drought severity. Knowledge life history phenology, other organisms, can guide effective management as help limit adverse organisms species.

Language: Английский

Anticipating responses to climate change and planning for resilience in California’s freshwater ecosystems DOI Creative Commons
Mary E. Power, Sudeep Chandra, Peter H. Gleick

et al.

Proceedings of the National Academy of Sciences, Journal Year: 2024, Volume and Issue: 121(32)

Published: July 29, 2024

As human-caused climate changes accelerate, California will experience hydrologic and temperature conditions different than any encountered in recorded history. How these affect the state's freshwater ecosystems? Rivers, lakes, wetlands are managed as a water resource, but they also support complex web of life, ranging from bacteria, fungi, algae to macrophytes, woody plants, invertebrates, fish, amphibians, reptiles, birds, mammals. In much state, native organisms already struggle survive massive diversions dams, deteriorating quality, extensive land cover modification for agriculture urban development, invasions exotic species. face change, we need expand efforts recover degraded ecosystems protect resilience, health, viability existing ecosystems. For this, more process-based understanding river, lake, is needed forecast how systems respond future change our interventions. This require 1) expanding ability model mechanistically biota environmental change; 2) hypothesis-driven monitoring field studies; 3) education training build research, practitioner, stewardship, policy capabilities; 4) developing tools policies building resilient A goals-driven, hypothesis-informed collaboration among tribes, state (and federal) agencies, nongovernmental organizations, academicians, consultants accomplish goals advance skills knowledge workforce practitioners, regulators, researchers who must live with that upon us intensify.

Language: Английский

Citations

3
Inferring Hillslope Groundwater Recharge Ratios From the Storage‐Discharge Relation DOI Creative Commons
David Dralle, W. Jesse Hahm, Daniella Rempe

et al.

Geophysical Research Letters, Journal Year: 2023, Volume and Issue: 50(14)

Published: July 25, 2023

Abstract Accurate observation of hillslope groundwater storage and instantaneous recharge remains difficult due to limited monitoring the complexity mountainous landscapes. We introduce a novel storage‐discharge method estimate ratio—the fraction precipitation that recharges groundwater. The method, which relies on streamflow data, is corroborated by independent measurements water dynamics inside Rivendell experimental at Eel River Critical Zone Observatory, California, USA. find along‐hillslope patterns in bedrock weathering plant‐driven govern seasonal evolution ratios. Thinner profiles smaller root‐zone deficits near‐channel are replenished before larger ridge‐top deficits. Consequently, progressively activates from channel divide, with an attendant increase ratios throughout wet season. Our approach process observations offer valuable insights into controls recharge, enhancing our understanding critical flux hydrologic cycle.

Language: Английский

Citations

7
Daily stream temperature predictions for free-flowing streams in the Pacific Northwest, USA DOI Creative Commons
Jared E. Siegel, Aimee H. Fullerton, Alyssa M. FitzGerald

et al.

PLOS Water, Journal Year: 2023, Volume and Issue: 2(8), P. e0000119 - e0000119

Published: Aug. 30, 2023

Supporting sustainable lotic ecosystems and thermal habitats requires estimates of stream temperature that are high in scope resolution across space time. We combined enhanced elements existing models to produce a new statistical model address this need. Contrasting with previous estimated coarser metrics such as monthly or seasonal focused on individual watersheds, we modeled daily the entire calendar year for broad geographic region. This reflects mechanistic processes using publicly available climate landscape covariates Generalized Additive Model framework. allowed interact while accounting nonlinear relationships between temporal spatial better capture patterns. To represent variation sensitivity climate, used moving average antecedent air temperatures over variable duration linked area-standardized streamflow. The window size was longer reaches having snow-dominated hydrology, especially at higher flows, whereas relatively constant low rain-dominated hydrology. Our model’s ability temporally-variable impact snowmelt improved its capacity predict diverse geography multiple years. fit from 1993–2013 predicted ~261,200 free-flowing Pacific Northwest USA 1990–2021. well (RMSE = 1.76; MAE 1.32°C). Cross-validation suggested produced useful predictions unsampled locations landscapes conditions. These will be natural resource practitioners effective conservation planning managing species salmon. approach is straightforward can adapted regions, time periods, scenarios anticipated decline change.

Language: Английский

Citations

7
Erosional exhumation of carbonate rock facilitates dispersal-mediated allopatric speciation in freshwater fishes DOI Creative Commons
Daemin Kim, Maya F. Stokes,

Sandy Ebersole

et al.

Evolution, Journal Year: 2023, Volume and Issue: 77(11), P. 2442 - 2455

Published: Aug. 30, 2023

A fundamental goal of evolutionary biology is to understand the mechanisms that generate and maintain biodiversity. Discovery delimitation species represent essential prerequisites for such investigations. We investigate a freshwater fish complex comprising Etheostoma bellator endangered E. chermocki, which endemic Black Warrior River system in Alabama, USA, global hotspot temperate Phylogenomic analyses delimit five geographically disjunct masquerading as bellator. Three these new exhibit microendemic distributions comparable chermocki raising possibility they also require protection. The are found streams flowing over carbonate rock separated by waterways siliciclastic rock, geographic pattern dictated underlying stratigraphy structural geology. Over time, rivers have eroded downward through layers rocks basin, gradually exposing substrate suitable habitat today. Our results suggest episodic dispersal patches set stage allopatric speciation complex. study suggests presence heterogeneous can facilitate dispersal-mediated organisms absence external tectonic or climatic perturbations.

Language: Английский

Citations

7
California steelhead populations were regionally buffered and individually resistant to a severe multi-year drought DOI
Haley A. Ohms, Eric P. Palkovacs, David A. Boughton

et al.

Canadian Journal of Fisheries and Aquatic Sciences, Journal Year: 2024, Volume and Issue: 81(11), P. 1594 - 1605

Published: July 19, 2024

Weather extremes, such as drought, are predicted to be a strong determinant of species persistence under climate change. Yet predictions often fail consider that variation in streamflow responses, population dynamics, or adaptations drought could buffer against extremes. In this study, we examined the responses eight California (USA) steelhead populations severe from 2012 2016. We observed streamflows were highly synchronous across region all seasons and did not appear impacts. Population dynamics variable Some had very low productivity for 4 years associated with while others slightly below-average only 2 years. synchrony was spring-smolt flow, temperature, over time, but winter-spawner summer-juvenile suggesting may adapted conditions. Our results highlight how regional buffering adaptation can important mechanisms extremes both now into future.

Language: Английский

Citations

1
Spring temperature predicts upstream migration timing of invasive Sacramento pikeminnow within its introduced range DOI Creative Commons
Philip B. Georgakakos, David Dralle, Mary E. Power

et al.

Environmental Biology of Fishes, Journal Year: 2023, Volume and Issue: 106(11), P. 2069 - 2082

Published: Nov. 1, 2023

Abstract Rapid climate change and invasive species introductions threaten ecological communities across the globe. Freshwaters are particularly vulnerable impacted, especially when these stresses coincide. We document migration of an piscine predator, Sacramento pikeminnow ( Ptychocheilus grandis ), within its introduced range, South Fork Eel River, California, USA. Snorkel surveys temperature monitoring in 2015–2019 showed that migrate upstream during spring early summer, with earlier warmer years. developed a statistical model to forecast timing extent by under varying combinations discharge air temperature. Modeled river increased downstream decreased discharge. In years low high temperature, we predict will move earlier, increasing spatial temporal overlap their summer range native fishes. Managing conditions reduce co-occurrence fishes (i.e., decreasing temperature) could increase amount duration predator-free habitat for have larger impacts on invaded riverine global warming drought severity. Knowledge life history phenology, other organisms, can guide effective management as help limit adverse organisms species.

Language: Английский

Citations

1