Mortality of Native and Non-native Fishes during Artificial Breaching of Coastal Lagoons in Southern and Central California

Swift, Camm C.; Mulder, Joel; Dellith, Chris; Kittleson, Kristen

doi:10.3160/1767.1

Cited by 9 publications

(17 citation statements)

References 10 publications

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“…1b). Although goby mortality in response to artificial, out‐of‐season breaches has been documented, our data reaffirm that natural breaching is not a major source of mortality for gobies and that they are well adapted to this feature of the environment (Swift et al 2018). When we observed fish mortality following breaches, the majority of fish stranded on dewatered mud or sand flats were stickleback, and the few tidewater goby observed were alive, and many were on a section of mudflat that would likely rewater at the next high tide (B.…”

Section: Discussionsupporting

confidence: 79%

“…Still, it is possible that the two species might use the habitat differently during different periods of the year when those environmental conditions change (Moyle 2002). For example, we moved our traps around the lagoon to avoid locations where diel oxygen swings may cause fish mortality, but this may have changed the relative accessibility of our traps to stickleback and more anoxia-tolerant gobies (Swift et al 2018). Unfortunately, this confounding effect could drive some of the relationships we see in the data.…”

Section: Discussionmentioning

confidence: 99%

“…Dissolved oxygen can reach anoxic conditions during the summer dry period.Northern tidewater goby ( Eucyclogobius newberryi ) are a federally threatened species that is a habitat specialist adapted to living in bar‐built estuaries (Swenson 1999). Such specialization does not mean they are immune from mortality during extreme environmental conditions such as hypoxia or breaching (Williams and Stacey 2016; Swift et al 2018). Tidewater goby populations fluctuate dramatically (Swenson 1999).…”

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confidence: 99%

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Applying empirical dynamic modeling to distinguish abiotic and biotic drivers of population fluctuations in sympatric fishes

Wasserman

Rogers

Munch

et al. 2022

Limnology & Oceanography

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Fluctuations in the population abundances of interacting species are widespread. Such fluctuations could be a response to abiotic factors, biotic interactions, or a combination of the two. Correctly identifying the drivers is critical for effective population management. However, such effects are not always static in nature. Nonlinear relationships between abiotic factors and biotic interactions make it difficult to parse true effects. We used a type of nonlinear forecasting, empirical dynamic modeling, to investigate the context‐dependent species interaction between a common fish (three‐spine stickleback) and an endangered one (northern tidewater goby) in a fluctuating environment: a central California bar‐built estuary. We found little evidence for competition, instead both species largely responded independently to abiotic conditions. Stickleback were negatively affected by sandbar breaching. The strongest predictor of tidewater goby abundance was stickleback abundance; however, this effect was not a uniform negative effect of stickleback on goby as would be hypothesized under interspecific competition. The effect of stickleback on gobies was positive, though it was temporally restricted. Tidewater goby abundance in the summer was strongly positively correlated to stickleback abundance in the spring, which represents an offset in the reproductive and recruitment peaks in the two species that may help minimize competition and promote coexistence. Our study demonstrates how empirical dynamic modeling can be applied to understand drivers of population abundance in putative competitors and inform management for endangered species.

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Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Applying empirical dynamic modeling to distinguish abiotic and biotic drivers of population fluctuations in sympatric fishes

Wasserman

Rogers

Munch

et al. 2022

Limnology & Oceanography

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“…taxonomy: While lacking formal description until now, the Santa Ana Speckled Dace has long been recognized as distinct (Swift et al 1993, Moyle 1976, 2002, Oakey et al 2004). Definitive morphometric and meristic characters are largely absent.…”

Section: Species/subspecies Descriptionsmentioning

confidence: 99%

“…The Santa Ana Speckled Dace has subsequently been referred to as just R. osculus (e.g. Swift et al 1993, Moyle 1976, 2002 Conservation Status. In California, Santa Ana Speckled Dace historically inhabited streams in the upland areas of the San Jacinto, Santa Ana, San Gabriel and Los Angeles rivers which were interconnected by lowelevation floodplains (Swift et al 1993, Moyle 2002, Moyle et al 2015) (Figure 5).…”

Section: Species/subspecies Descriptionsmentioning

confidence: 99%

Taxonomy of the Speckled Dace Species Complex (Cypriniformes: Leuciscidae, Rhinichthys) in California, USA

Moyle¹,

Buckmaster

2023

Zootaxa

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The Speckled Dace, Rhinichthys osculus (Girard), is a small species of fish (Cypriniformes, Leuciscidae) that has the widest geographic range of any freshwater dispersing fish in western North America. The dynamic geologic history of the region has produced many isolated watersheds with endemic fish species. However, Speckled Dace from these watersheds cannot be differentiated readily by morphometrics and meristics. This has led to the widely accepted hypothesis that the dace’s adaptability and ability to cross geologic barriers has resulted in interbreeding among neighboring populations, maintaining the dace as a single species. We investigate this hypothesis by looking at Speckled Dace populations in California which are the result of at least three separate colonization events of isolated watersheds. We synthesize results from taxonomic, genetic, and zoogeographic studies in combination with the findings of a recent genomics study, to show that there are distinctive evolutionary lineages within the Speckled Dace complex. These lineages are used to designate multiple species and subspecies. We back up these designations by examining how well these lineages fit with the geologic history of the isolated basins they inhabit and with the presence of other endemic fishes. We conclude the following nine taxa can be recognized within the Speckled Dace complex in California.

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Etiology of a Fish Kill, Including the Endangered Tidewater Goby (Eucyclogobius newberryi), in a Northeastern Pacific Coastal Lagoon

Feyrer,

Young,

Kraus

et al. 2023

Estuaries and Coasts

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Ecological disturbances such as fish kills can negatively impact ecosystem processes in coastal lagoons. To gain an understanding of factors causing fish kills, we examined conditions associated with a summertime fish kill in a northeastern Pacific coastal lagoon (Rodeo Lagoon, CA, USA). Examination of available data indicated the fish kill was likely caused by hypoxia involving the following etiology: (1) strong onshore winds (up to 12 m/s) mixed a stratified water column, (2) water column mixing transported nutrients from near the bed into the photic zone, (3) increased nutrient concentrations in the photic zone (> 200%) together with high solar irradiance fueled a phytoplankton bloom, (4) death and decomposition of phytoplankton (72% decrease in abundance) contributed to biological oxygen demand that led to (5) hypoxic conditions (as low as 0.6 mg/L) that caused the fish kill. The event resulted in the death of an estimated 3677 Tidewater Goby (Eucyclogobius newberryi), a species listed as endangered under the US Endangered Species Act, and numerous (but not enumerated) Threespine Stickleback (Gasterosteus aculeatus), unidentified sculpins (Cottidae), and macroinvertebrates (primarily Amphipoda). The processes contributing to the event are likely re-occurring phenomena responsible for observed periodic fish kills. Coastal lagoons with limited freshwater inflows and connection to the Pacific Ocean may retain nutrients and be susceptible to similar events.

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Mortality of Native and Non-native Fishes during Artificial Breaching of Coastal Lagoons in Southern and Central California

Cited by 9 publications

References 10 publications

Applying empirical dynamic modeling to distinguish abiotic and biotic drivers of population fluctuations in sympatric fishes

Applying empirical dynamic modeling to distinguish abiotic and biotic drivers of population fluctuations in sympatric fishes

Taxonomy of the Speckled Dace Species Complex (Cypriniformes: Leuciscidae, Rhinichthys) in California, USA

Etiology of a Fish Kill, Including the Endangered Tidewater Goby (Eucyclogobius newberryi), in a Northeastern Pacific Coastal Lagoon

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