Evidence for skipped spawning in a potamodromous cyprinid, humpback chub (Gila cypha), with implications for demographic parameter estimates

Pearson, Kristen Nicole; Kendall, William L.; Winkelman, Dana L.; Persons, William R.

doi:10.1016/j.fishres.2015.05.015

Cited by 8 publications

(4 citation statements)

References 33 publications

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“…PIAs in Shinumo and Bright Angel creeks spanned the width of their respective stream channels, and were installed as close to the mouth as possible (~200 m), but differed in the number of arrays; Shinumo Creek consisted of two antenna arrays installed 200 m upstream of the waterfall, while three were installed in Bright Angel Creek for additional redundancy to improve detection rates. PIA operations were uninterrupted with some exceptions; due to power supply issues and flood damage, the LCR PIA has operated intermittently since 2009 (Pearson et al, 2015) with more continuous operation between August 2017 and August 2019, and the Shinumo Creek PIA power failed briefly during winter of 2010. The Shinumo PIA was destroyed during the flood of July 2014.…”

Section: Methodsmentioning

confidence: 99%

Life and death in a dynamic environment: Invasive trout, floods, and intraspecific drivers of translocated populations

Healy

Budy

Conner

et al. 2022

Ecological Applications

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Understanding the relative strengths of intrinsic and extrinsic factors regulating populations is a long-standing focus of ecology and critical to advancing conservation programs for imperiled species. Conservation could benefit from an increased understanding of factors influencing vital rates (somatic growth, recruitment, survival) in small, translocated populations, which is lacking owing to difficulties in long-term monitoring of rare species. Translocations, here defined as the transfer of wild-captured individuals from source populations to new habitats, are widely used for species conservation, but outcomes are often minimally monitored, and translocations that are monitored often fail. To improve our understanding of how translocated populations respond to environmental variation, we developed and tested hypotheses related to intrinsic (density dependent) and extrinsic (introduced rainbow trout Oncorhynchus mykiss, stream flow and temperature regime) causes of vital rate variation in endangered humpback chub (Gila cypha) populations translocated to Colorado River tributaries in the Grand Canyon (GC), USA. Using biannual recapture data from translocated populations over 10 years, we tested hypotheses related to seasonal somatic growth, and recruitment and population growth rates with linear mixed-effects models and temporal symmetry mark-recapture models. We combined data from recaptures and resights of dispersed fish (both physical captures and continuously recorded antenna detections) from throughout GC to test survival hypotheses, while accounting for site fidelity, using joint live-recapture/live-resight models. While recruitment only occurred in one site, which also drove population growth (relative to survival), evidence supported hypotheses related to density dependence in growth, survival, and recruitment, and somatic growth and recruitment were further limited by introduced trout. Mixed-effects models explained between 67% and 86% of the variation in somatic growth, which showed increased growth rates with greater flood-pulse frequency during monsoon season. Monthly survival was 0.56-0.99 and 0.80-0.99 in the two populations, with lower survival during periods of higher intraspecific

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Section: Methodsmentioning

confidence: 99%

Life and death in a dynamic environment: Invasive trout, floods, and intraspecific drivers of translocated populations

Healy

Budy

Conner

et al. 2022

Ecological Applications

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“…This directional shift in the suckers could be explained by stochastic variation, annual variability in growth rates, annual behavioral differences (such as skipped spawning, as has been observed for another Colorado River large‐bodied fish: Pearson et al. ), or recent decreased recruitment of smaller mature fish. With only 3 years of data to compare (two for Flannelmouth Sucker), it is impossible determine the true cause of the size shift, but the most concerning possibility is that of decreased recruitment of mature suckers.…”

Section: Discussionmentioning

confidence: 87%

An Intermittent Stream Supports Extensive Spawning of Large‐River Native Fishes

et al. 2019

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Intermittent or ephemeral streams make up a large percentage of all stream habitats and may have significant roles in spawning, foraging, refugia, and early life history habitat for many fishes. From 2015 to 2017 we examined the use of Cottonwood Creek, an intermittent tributary in the Gunnison River basin, Colorado, by spawning Flannelmouth Sucker Catostomus latipinnis, Bluehead Sucker C. discobolus, and Roundtail Chub Gila robusta. We used combinations of a stream‐spanning picket weir and PIT‐tag antennae near the mouth of the creek to determine fish movement in and out of the stream, which was more effective for the suckers than for Roundtail Chub. Large numbers of suckers used the stream each year despite very different flow regimes. The timing of initial fish entry varied by 6 weeks across 3 years of study from March 17 to May 6. Immigration was only loosely and inconsistently correlated to abiotic factors (various stream temperature metrics and discharge) among years and was most heavily dependent on the presence of sufficient water in the stream to permit fish passage. Average residency times of suckers ranged from 26 to 37 d depending on year and species, and spawning fish lost 10–18% of their body weight depending on species and sex. Both sucker species displayed a high level of annual site fidelity—61–71% of fish returned the year after being tagged. Larval drift was sporadic and many larvae failed to evacuate the stream before flow ceased each year. While further research is needed to assess the overall recruitment contribution from Cottonwood Creek to the regional population, this study revealed use of an intermittent tributary by thousands of native Colorado River fishes, highlighting the importance of nonperennial waters for the completion of the life histories of some large‐river fish species.

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“…], fish [Pearson et al. ]). Because sea turtles, whose foraging grounds are usually distant from their nesting beaches, use this conditional strategy, we expected the Jumby Bay nesting population to exhibit relatively constant survival and variable remigration (conditional breeding) probabilities.…”

Section: Introductionmentioning

confidence: 99%

“…Long-lived, iteroparous species tend to have high survival rates once they reach maturity, due, in part, to their ability to vary their reproductive effort in response to environmental conditions (e.g., food availability, distance to breeding area). These adjustments can take the form of foregoing breeding in some years (Bull and Shine 1979), especially for migratory species (e.g., seabirds [Converse et al 2009], pinnipeds [Hadley et al 2007], cetaceans [Fujiwara and Caswell 2002], amphibians [Church et al 2007], fish [Pearson et al 2015]). Because sea turtles, whose foraging grounds are usually distant from their nesting beaches, use this conditional strategy, we expected the Jumby Bay nesting population to exhibit relatively constant survival and variable remigration (conditional breeding) probabilities.…”

Section: Introductionmentioning

confidence: 99%

A multistate open robust design: population dynamics, reproductive effort, and phenology of sea turtles from tagging data

Kendall

Stapleton

White

et al. 2018

Ecological Monographs

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Understanding population dynamics, and how it is influenced by exogenous and endogenous factors, is important to the study and conservation of species. Moreover, for migratory species, the phenology and duration of use of a given location can also influence population structure and dynamics. For many species, breeding abundance, survival, and reproductive performance, as well as phenology of nesting, are often the most accessible, and therefore, practical elements of their life history to study. For a population of hawksbill sea turtles (Eretmochelys imbricata), we modeled population change for nesters and total adult females, survival, and breeding probability, from 25 yr of intensive tagging data. We modeled breeding probability as a function of the number of years since last breeding and tested for differences between neophyte and experienced nesters. For each year, we also estimated the number of clutches deposited per female, and phenology of use, for neophytes and experienced nesters. To implement the analysis, we developed a novel generalized multistate open robust design mark–recapture modeling framework, with parameters for survival and transition probabilities, and for each primary period, state structure and arrival, persistence, and detection probabilities. Derived parameters included abundance of observable and unobservable components of the population, residence time, expected arrival and departure periods, and per‐period intensity of study area use. Abundance of nesters increased over most of the time series. Survival probability was 0.935 ± 0.01 (estimate ± SE). Virtually all hawksbills skipped at least one year of nesting. Breeding probability increased by skipping a second year, but then decreased thereafter. Subsequent breeding probability was lower for neophyte nesters than for experienced nesters, but the effect was weaker than the effect of years since breeding. Clutch frequency varied by year, with no discernable pattern of differences between neophytes and experienced nesters. Mean arrival and departure dates also varied, with a slight shift of nesting activity to earlier in the season. The multistate open robust design model developed here provides a flexible framework for modeling the dynamics of structured migratory populations and the phenology and duration of their seasonal use of study areas.

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Evidence for skipped spawning in a potamodromous cyprinid, humpback chub (Gila cypha), with implications for demographic parameter estimates

Cited by 8 publications

References 33 publications

Life and death in a dynamic environment: Invasive trout, floods, and intraspecific drivers of translocated populations

Life and death in a dynamic environment: Invasive trout, floods, and intraspecific drivers of translocated populations

An Intermittent Stream Supports Extensive Spawning of Large‐River Native Fishes

A multistate open robust design: population dynamics, reproductive effort, and phenology of sea turtles from tagging data

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