Estuarine Habitat and Demographic Factors Affect Juvenile Chinook (Oncorhynchus tshawytscha) Growth Variability in a Large Freshwater Tidal Estuary

Goertler, Pascale; Simenstad, Charles A.; Bottom, Daniel L.; Hinton, Susan A.; Stamatiou, Lia

doi:10.1007/s12237-015-0002-z

Cited by 17 publications

(22 citation statements)

References 60 publications

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“…; Goertler et al. ), and the Yolo Bypass provides two valuable forms of off‐channel habitat: floodplain in wet years and tidal slough in drier years.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, variably inundated floodplains, such as the Yolo Bypass, may provide benefits for juvenile salmon and other planktivorous fish by maintaining a supply of zooplankton and providing access to terrestrial invertebrates during droughts and high-value prey during floods. The importance of off-channel habitats has been demonstrated in several systems (Limm and Marchetti 2009;Hattin et al 2014;Goertler et al 2016b), and the Yolo Bypass provides two valuable forms of off-channel habitat: floodplain in wet years and tidal slough in drier years.…”

Section: Discussionmentioning

confidence: 99%

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Effects of Extreme Hydrologic Regimes on Juvenile Chinook Salmon Prey Resources and Diet Composition in a Large River Floodplain

Goertler¹,

Jones²,

Cordell

et al. 2018

Trans Am Fish Soc

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Climate and hydrologic variability are defining characteristics of California rivers. Recently, the region experienced an unprecedented drought, and the probability of similarly warm, dry conditions is predicted to increase. In addition to warming air and water temperatures, climate change projections predict increased flooding and sea level rise, likely aggravating the water resource issues that already challenge the western United States. Water managers balance many public interests, including the conservation of native fishes, such as the Chinook Salmon Oncorhynchus tshawytscha. Given projected changes in climate and hydrology, there is an urgent need to understand how salmon respond to these conditions. In this study, we examined how young salmon responded to extreme drought (2012–2015) versus flood (1998–1999) conditions in the Yolo Bypass, a floodplain–tidal slough complex of the Sacramento River, California. We found that the diets of juvenile Chinook Salmon were dominated by aquatic–riparian insects during flooding and were dominated by zooplankton during the drought. Although juvenile salmon that were caught during the drought seemed to have eaten a higher number of prey items on average, they also had higher metabolic costs. Therefore, it is likely that juvenile salmon must augment their foraging behavior to offset higher temperatures and prey shifts. Finally, preferentially consumed, calorically valuable prey (i.e., larger zooplankton and aquatic–riparian insects) have become rare due to habitat degradation and biological invasions, and resource managers must consider re‐establishing productive off‐channel habitats, such as riparian corridors, floodplains, and wetlands.

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“…; Goertler et al. ), and the Yolo Bypass provides two valuable forms of off‐channel habitat: floodplain in wet years and tidal slough in drier years.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effects of Extreme Hydrologic Regimes on Juvenile Chinook Salmon Prey Resources and Diet Composition in a Large River Floodplain

Goertler¹,

Jones²,

Cordell

et al. 2018

Trans Am Fish Soc

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show abstract

“…Historically, much of the Delta, including our study location, was characterized by freshwater emergent wetlands (Whipple et al 2012). Vegetated littoral zones like these are important for producing invertebrate biomass as food for threatened and endangered juvenile salmonids and other fishes that forage on insects and zooplankton (Fresh 2006;Hampton et al 2011;Naiman et al 2012;del Rosario et al 2013;Goertler et al 2015;Brown et al 2016). However, only a small proportion of historic Delta freshwater wetlands remain today (Whipple et al 2012).…”

Section: Case Study: Water Hyacinth In the Sacramento-san Joaquin Rivmentioning

confidence: 99%

Management of Invasive Water Hyacinth as Both a Nuisance Weed and Invertebrate Habitat

Marineau¹,

Perryman²,

Lawler³

et al. 2019

SFEWS

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“…; Goertler et al. ). Therefore, information on fish movements, timing, and the habitats that are used is valuable to managers.…”

mentioning

confidence: 98%

“…Thus, they are critical to increasing the abundance of many stocks. Additionally, the diversity of habitats that is associated with these areas may provide a pathway to alternate life histories (Bottom et al 2005;Craig et al 2014;Goertler et al 2015). Therefore, information on fish movements, timing, and the habitats that are used is valuable to managers.…”

mentioning

confidence: 99%

Seasonal Use of a Nonnatal Marine Basin by Juvenile Hatchery Chinook Salmon

Hayes

Hodgson²,

Ellings³

et al. 2019

Mar Coast Fish

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Information on the movement patterns of fishes is essential for managers that are making critical resource decisions. We examined the frequency of a keystone species, Chinook Salmon Oncorhynchus tshawytscha that migrated from different marine basins to the Nisqually River estuary, which lies within the southernmost marine basin (hereafter, “South basin”) in Puget Sound (Washington, USA). Hatchery‐reared juvenile fish were sampled by using beach seine, lampara seine, and fyke nets to determine seasonal trends in frequency, habitat use, and the influence of different capture methods. The captured fish originated from three marine basins, nine Puget Sound rivers, and fourteen hatcheries. The data revealed a consistent pattern showing that most of the tagged fish (72%) were from the nearby Nisqually River (in the South basin), but fish from more northerly marine basins (hereafter, “Outbasin”) were also common. Although the majority of the tagged fish (99%) that were captured during April and May were originally released into rivers adjacent to the South basin, 90% of the fish that were captured in August and September had originated from rivers adjacent to Outbasin locations (up to 130 km distant). A comparison of sampling methods showed that the beach seine produced 27% Outbasin fish compared with 53% that were obtained with the lampara seine. The analysis of habitat use suggested that during June and July, more Outbasin fish (>40%) were captured in delta flats and nearshore habitats than in estuarine emergent marsh habitat (26%). Release location (river basin), but not distance, appeared to be an important factor that influenced the percentage of Outbasin fish that were captured in the South basin. However, it appeared that the fish that were released at light weights and early dates were more likely to be captured. Information on the movement of juvenile salmon to a nonnatal marine basin may help to increase our understanding of features of life history and survival, and it has application elsewhere, as many marine species are artificially propagated, released in large numbers, and have the potential to use nonnatal habitats.

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Estuarine Habitat and Demographic Factors Affect Juvenile Chinook (Oncorhynchus tshawytscha) Growth Variability in a Large Freshwater Tidal Estuary

Cited by 17 publications

References 60 publications

Effects of Extreme Hydrologic Regimes on Juvenile Chinook Salmon Prey Resources and Diet Composition in a Large River Floodplain

Effects of Extreme Hydrologic Regimes on Juvenile Chinook Salmon Prey Resources and Diet Composition in a Large River Floodplain

Management of Invasive Water Hyacinth as Both a Nuisance Weed and Invertebrate Habitat

Seasonal Use of a Nonnatal Marine Basin by Juvenile Hatchery Chinook Salmon

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