Tidal Habitats Support Large Numbers of Invasive Blue Catfish in a Chesapeake Bay Subestuary

Fabrizio, Mary C.; Tuckey, Troy D.; Latour, Robert J.; White, Gary C.; Norris, Alicia J.

doi:10.1007/s12237-017-0307-1

Cited by 33 publications

(56 citation statements)

References 37 publications

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“…) and Blue Catfish Ictalurus furcatus (Fabrizio et al. )—however, Hardhead Catfish and Gafftopsail Catfish are also found in oceanic habitats, such as the coastal shelf, and are considered permanent residents of marine environments. Hardhead Catfish and Gafftopsail Catfish have overlapping distributions in the southeastern U.S. Atlantic and U.S. Gulf of Mexico.…”

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confidence: 99%

Age and Growth of Hardhead Catfish and Gafftopsail Catfish in Coastal Louisiana, USA

2019

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The Hardhead Catfish Ariopsis felis and Gafftopsail Catfish Bagre marinus are marine catfishes that have low recreational and commercial landings in U.S. waters, although they are among the most abundant species in coastal waters of the Gulf of Mexico. Few biological studies exist on marine catfishes, with most studies focusing on their unique reproductive biology. This study evaluated weight–length relationships for Gafftopsail Catfish (n = 264) and Hardhead Catfish (n = 823) sampled from across coastal Louisiana, USA, during 2016–2018; subsamples (93 and 266, respectively) were aged using lapilli for age and growth analyses. Hardhead Catfish showed a small but significant difference in weight as a function of length between males and females, with females being slightly heavier than males at any given length. No sexual dimorphism in weight and length was observed in Gafftopsail Catfish. Ages ranged from 0 to 10 years for Gafftopsail Catfish and from 0 to 24 years for Hardhead Catfish. Both sexes of Gafftopsail Catfish attained larger maximum average sizes (asymptotic length L∞) and exhibited larger growth coefficients (k) than both sexes of Hardhead Catfish. Length at age of Hardhead Catfish in Louisiana was greater than that of Florida fish. The estimated k for Gafftopsail Catfish in Louisiana was almost three times greater than that observed in Florida, with fish reaching their L∞ rapidly compared to those in Florida. Given the increasing evidence for an equilibrium life history strategy (i.e., K strategy), the spatial differences in size at age, and the potential for increased exploitation, continued investigations into both species’ biology and life history should be undertaken.

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confidence: 99%

Age and Growth of Hardhead Catfish and Gafftopsail Catfish in Coastal Louisiana, USA

2019

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“…Yet, the required level of harvest is currently unknown and needs directed research (Fabrizio et al. ). Targeted harvests from known nursery areas could be beneficial toward efforts to disrupt the recruitment of this species.…”

Section: Discussionmentioning

confidence: 99%

“…; Fabrizio et al. ), though the populations in the James, York, and Rappahannock rivers remain largely distinct stocks with little mixing among the subestuaries (Higgins ). Through competition and predation, Blue Catfish may negatively affect the abundance of local fauna like American Shad Alosa sapidissima , river herring Alosa spp., Atlantic Menhaden Brevoortia tyrannus , and blue crab Callinectes sapidus , many of which are of economic or conservation concern (MacAvoy et al.…”

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confidence: 99%

Density‐Dependence Mediates the Effects of Temperature on Growth of Juvenile Blue Catfish in Nonnative Habitats

Nepal

Fabrizio

2020

Trans Am Fish Soc

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The combined effects of conspecific density and climate warming on the vital rates of invasive fish species have not been well studied, but may be important in predicting how successful they will be in the future. We evaluated the effects of temperature and population density on monthly time series of sizes of age-0 Blue Catfish Ictalurus furcatus in the James, York, and Rappahannock River subestuaries (defined here as tidally influenced bodies of water that feed into the Chesapeake Bay) from 1996 to 2017, using growing degree-days (GDDs,°C day) as a measure of thermal time. Our predictive linear mixed-effects model explained 86% of the variation in the length of age-0 Blue Catfish. In addition, it indicated a strong positive effect of temperature on the growth rate of age-0 Blue Catfish, with individual fish biomass during warm years up to 63% higher than during cool years. Growth rate was influenced negatively by the abundance of age-0 and older fish, resulting in at least fourfold differences in the predicted biomass of Blue Catfish by the end of the first year of life depending on conspecific density. We also observed regional differences in the growth rates of Blue Catfish in the three subestuaries we examined; although growth occurred in all subestuaries, growth was highest for the Rappahannock River population even though this river accumulated the fewest GDDs. Rising water temperatures due to global climate change will likely increase the growth rate of age-0 Blue Catfish in the Chesapeake Bay region, potentially intensifying the negative impacts of this invasive species on the ecology of Chesapeake Bay. However, individual populations respond differently to warming temperatures, and thus, potential increases in the growth rate of age-0 Blue Catfish may be partially offset by local conditions that may serve to limit growth.

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“…Robust design in combination with auxiliary resightings of live individuals outside of the primary sampling area or period is a very effective way of reducing terminal bias in survival estimates under Markovian temporary emigration (Peñaloza, Kendall, & Langtimm, 2014). Despite the benefits of increased precision of parameter estimates and user-friendly implementation in program MARK (White & Burnham, 1999), the Barker/robust design approach has only rarely been used in empirical applications to estimate survival and population size or density (as derived parameters) of wild animal populations (Fabrizio, Tuckey, Latour, White, & Norris, 2018;Gómez-Ramírez, Gutiérrez-González, & López-González, 2017;Gutiérrez-González, Gómez-Ramírez, López-González, & Doherty, 2015;Ivan, White, & Shenk, 2014;Weithman et al, 2017). Weithman et al (2017) additionally interpreted the "availability" parameter (aʹ, the probability of being available for capture given that the individual was previously unavailable for capture) as a measure of breeding probability in piping plover (Charadrius melodus), a migratory shorebird.…”

Section: Making Use Of Multiple Sampling Occasionsmentioning

confidence: 99%

Making use of multiple surveys: Estimating breeding probability using a multievent‐robust design capture–recapture model

Oosthuizen

Pradel

Bester

et al. 2019

Ecology and Evolution

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Increased environmental stochasticity due to climate change will intensify temporal variance in the life‐history traits, and especially breeding probabilities, of long‐lived iteroparous species. These changes may decrease individual fitness and population viability and is therefore important to monitor. In wild animal populations with imperfect individual detection, breeding probabilities are best estimated using capture–recapture methods. However, in many vertebrate species (e.g., amphibians, turtles, seabirds), nonbreeders are unobservable because they are not tied to a territory or breeding location. Although unobservable states can be used to model temporary emigration of nonbreeders, there are disadvantages to having unobservable states in capture–recapture models. The best solution to deal with unobservable life‐history states is therefore to eliminate them altogether. Here, we achieve this objective by fitting novel multievent‐robust design models which utilize information obtained from multiple surveys conducted throughout the year. We use this approach to estimate annual breeding probabilities of capital breeding female elephant seals (Mirounga leonina). Conceptually, our approach parallels a multistate version of the Barker/robust design in that it combines robust design capture data collected during discrete breeding seasons with observations made at other times of the year. A substantial advantage of our approach is that the nonbreeder state became “observable” when multiple data sources were analyzed together. This allowed us to test for the existence of state‐dependent survival (with some support found for lower survival in breeders compared to nonbreeders), and to estimate annual breeding transitions to and from the nonbreeder state with greater precision (where current breeders tended to have higher future breeding probabilities than nonbreeders). We used program E‐SURGE (2.1.2) to fit the multievent‐robust design models, with uncertainty in breeding state assignment (breeder, nonbreeder) being incorporated via a hidden Markov process. This flexible modeling approach can easily be adapted to suit sampling designs from numerous species which may be encountered during and outside of discrete breeding seasons.

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Tidal Habitats Support Large Numbers of Invasive Blue Catfish in a Chesapeake Bay Subestuary

Cited by 33 publications

References 37 publications

Age and Growth of Hardhead Catfish and Gafftopsail Catfish in Coastal Louisiana, USA

Age and Growth of Hardhead Catfish and Gafftopsail Catfish in Coastal Louisiana, USA

Density‐Dependence Mediates the Effects of Temperature on Growth of Juvenile Blue Catfish in Nonnative Habitats

Making use of multiple surveys: Estimating breeding probability using a multievent‐robust design capture–recapture model

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