Temporal patterns and ecosystem correlates of chum salmon (<i>Oncorhynchus keta</i>) migration phenology in the Pacific Northwest

Agha, Mickey; Losee, James P.; Litz, Marisa N.C.; Smith, Craig M.; Schaffler, Jason J.; Patton, William S.; Dufault, Aaron; Madel, Gabe M.

doi:10.1139/cjfas-2020-0392

Cited by 4 publications

(2 citation statements)

References 53 publications

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“…Warming-driven host–parasite decoupling has been reported among trematode parasites of amphibians ( 57 , 58 ), brood parasites of avian hosts ( 59 ), and nematode parasites of livestock ( 60 ). In Puget Sound, climate-driven phenological shifts are occurring among several potential hosts, including zooplankton ( 61 , 62 ), benthic invertebrates ( 63 ), and salmon ( 64 , 65 ). Such climate-driven temporal mismatching could produce the declines we observed among 3+-host parasites—declines that we would expect to observe primarily among those parasites with multiple host species whose phenology must align with that of the parasite for successful transmission.…”

Section: Discussionmentioning

confidence: 99%

A reconstruction of parasite burden reveals one century of climate-associated parasite decline

Wood

Welicky

Preisser

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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Long-term data allow ecologists to assess trajectories of population abundance. Without this context, it is impossible to know whether a taxon is thriving or declining to extinction. For parasites of wildlife, there are few long-term data—a gap that creates an impediment to managing parasite biodiversity and infectious threats in a changing world. We produced a century-scale time series of metazoan parasite abundance and used it to test whether parasitism is changing in Puget Sound, United States, and, if so, why. We performed parasitological dissection of fluid-preserved specimens held in natural history collections for eight fish species collected between 1880 and 2019. We found that parasite taxa using three or more obligately required host species—a group that comprised 52% of the parasite taxa we detected—declined in abundance at a rate of 10.9% per decade, whereas no change in abundance was detected for parasites using one or two obligately required host species. We tested several potential mechanisms for the decline in 3+-host parasites and found that parasite abundance was negatively correlated with sea surface temperature, diminishing at a rate of 38% for every 1 °C increase. Although the temperature effect was strong, it did not explain all variability in parasite burden, suggesting that other factors may also have contributed to the long-term declines we observed. These data document one century of climate-associated parasite decline in Puget Sound—a massive loss of biodiversity, undetected until now.

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Section: Discussionmentioning

confidence: 99%

A reconstruction of parasite burden reveals one century of climate-associated parasite decline

Wood

Welicky

Preisser

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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“…Generalized additive models (GAMs) offer a modeling approach that is readily interpretable while not assuming that relationships between predictors and response variables are linear, allowing nonlinear patterns in data to be identified (Venables and Dichmont 2004; Agha et al. 2021). In particular, GAMs produce nonlinear smoothing ( s ) terms, each of which has an estimated degrees of freedom (edf) that is proportional to the nonlinearity of its relationship with the response variable (edf = 1 is linear, edf > 1 is increasingly nonlinear).…”

Section: Methodsmentioning

confidence: 99%

Redear Sunfish Occurrence, Abundance, Growth, and Size Structure as Related to Abiotic and Biotic Factors in Florida Lakes

Carlson

Hoyer

2022

N American J Fish Manag

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Panfish support popular, socioeconomically valuable fisheries across the United States. Whereas Bluegill Lepomis macrochirus and Black Crappie Pomoxis nigromaculatus receive considerable research attention, Redear Sunfish L. microlophus are seldom studied despite their wide distribution, large size, socioeconomic contributions, and invasion potential in parts of their introduced range. We evaluated Redear Sunfish occurrence, density, relative abundance, growth, and size structure in 60 Florida lakes with varied surface area (2-12,412 ha), trophic state (oligotrophic to hypereutrophic), and macrophyte abundance (0.3-100% of lake volume inhabited), a range of environmental conditions over which Redear Sunfish populations have scarcely been investigated. Lake surface area, chlorophyll-a concentration, and macrophyte abundance explained 98% of variation in Redear Sunfish occurrence. Redear Sunfish density increased asymptotically with calcium concentration, whereas relative abundance (electrofishing fish/h) peaked at intermediate surface area (50-100 ha) and chlorophyll a (20 μg/L). Mean length at age 3 declined with increasing macrophyte abundance and was parabolically related to Redear Sunfish density, peaking at approximately 450 fish/ ha. The proportional size distribution (PSD) and PSD of preferred-length fish were also negatively related to macrophyte abundance, and PSD declined with increasing Redear Sunfish density. Our results suggest that Redear Sunfish fisheries with abundant individuals of quality size (≥180 mm) require large (>100 ha), fertile (>20 μg/L chlorophyll a) lakes with calcium concentrations >5 mg/L, moderate macrophyte abundance (0-25% of lake volume inhabited), and Redear Sunfish densities between 200 and 700 fish/ha. Our modeling approach can help managers predict Redear Sunfish occurrence, density, relative abundance, growth, and size structure based on a suite of abiotic and biotic variables.Panfish-commonly defined as sunfishes Lepomis spp., crappies Pomoxis spp., rock basses Ambloplites spp., and Yellow Perch Perca flavescens (Lyons et al. 2017)-support some of the most popular and socioeconomically valuable fisheries in the United States. In 2016, 8.4 million anglers targeted panfish on 110 million combined angling days (USFWS and USCB 2018a), a level of angling interest exceeding years 2001 (7.9 million anglers, 103 million angling days), 2006 (7.5 million anglers, 102 million angling days), and 2011 (7.3 million anglers, 97 million angling days; USFWS and USCB 2002, 2018b, 2018c). Panfish fisheries make particularly important

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Individual repeatability in the timing of river entry indicates the strong influence of photoperiod in the spawning migrations of iteroparous twaite shad Alosa fallax

et al. 2023

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The timing of entry into freshwater by mature anadromous fishes is an important component of their migration phenology. In iteroparous anadromous species, identifying the migration cues that influence the timing of entry into freshwater, and annual variability in these timings, is important in assessing the extent of individual repeatability. Here, passive acoustic telemetry tracked 71 twaite shad Alosa fallax (‘shad’) returning to the River Severn’s upper estuary over successive spawning seasons, providing individual information on river entry timing and the associated migration cues. The timing of shad returning to the river (defined as their first detection on an acoustic receiver in the upper estuary) was consistent between years and strongly predicted by photoperiod (as increasing day length), whereas water temperatures and flow rates were weak predictors and highly variable between years. Timings of river entry of individual shad were also consistent across consecutive spawning migrations, indicating high individual repeatability. The application of acoustic telemetry in this study thus revealed high repeatability in the timing of annual spawning migrations, which were cued mainly by increasing day length and that, being seasonally predictable, should ensure entry into freshwater with sufficient time to arrive in spawning areas when in-river environmental conditions are favourable.

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Temporal patterns and ecosystem correlates of chum salmon (Oncorhynchus keta) migration phenology in the Pacific Northwest

Cited by 4 publications

References 53 publications

A reconstruction of parasite burden reveals one century of climate-associated parasite decline

A reconstruction of parasite burden reveals one century of climate-associated parasite decline

Redear Sunfish Occurrence, Abundance, Growth, and Size Structure as Related to Abiotic and Biotic Factors in Florida Lakes

Individual repeatability in the timing of river entry indicates the strong influence of photoperiod in the spawning migrations of iteroparous twaite shad Alosa fallax

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