Climate change linked to functional homogenization of a subtropical estuarine system

Pawluk, Michaela; Fujiwara, Masami; Martinez‐Andrade, Fernando

doi:10.1002/ece3.8783

Cited by 11 publications

(6 citation statements)

References 69 publications

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“…2011; Pawluk et al. 2021, 2022). While we did not explicitly examine relative trends of other species that share the estuarine landscape with Gafftopsail Catfish, understanding the population dynamics of this species will help future studies discern these larger community‐level changes.…”

Section: Discussionmentioning

confidence: 99%

“…The observed in Gafftopsail Catfish populations along the Texas coast interpreted in the context of their known trophic role demonstrate the dynamic trophic landscape in which fisheries management operates. Several past studies have highlighted community level shifts in estuaries and other ecosystem that resulted in changes to biodiversity and trophic functionality of the food web as a whole (Clavel et al 2011;Pawluk et al 2021Pawluk et al , 2022. While we did not explicitly examine relative trends of other species that share the estuarine landscape with Gafftopsail Catfish, understanding the population dynamics of this species will help future studies discern these larger community-level changes.…”

Section: Model and Bay Systemmentioning

confidence: 99%

“…We further interpreted these trends from the standpoint of published life history and trophic role information for this species, with an eye towards potential ecosystem-level influences that this species may exert. Understanding any potential changes in species abundance will additionally aid in the ongoing discussions of larger changes to estuarine community composition and associated trophic implications (e.g., Pawluk et al 2021Pawluk et al , 2022.…”

Section: Introductionmentioning

confidence: 99%

“…Understanding any potential changes in species abundance will additionally aid in the ongoing discussions of larger changes to estuarine community composition and associated trophic implications (e.g., Pawluk et al. 2021, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Gafftopsail Catfish in Texas estuaries: Population trends and ecosystem implications

Cates,

Hale,

Olsen

2024

N American J Fish Manag

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ObjectiveGiven the limited information on population dynamics of Gafftopsail Catfish Bagre marinus in the western Gulf of Mexico, the objectives of this study were to determine the status of this species in Texas estuaries by assessing trends in relative abundance, length, and habitat preferences from fishery‐independent trawl (juvenile) and gill net (adult) data as well as angler harvest trends from fishery dependent creel surveys collected in all Texas estuaries.MethodsFishery independent and dependent monitoring data were collected by Texas Parks and Wildlife Department in all major bay systems of the Texas coast from 1983‐2022. Linear trend analysis was used to assess trends across the full timeseries and all major bay systems for both juvenile and adult specimens and for total recreational harvest. Boosted regression tree analysis was used to assess habitat preference for both juveniles and adults.ResultBoth juvenile and adult catch rates consistently increased in most Texas estuaries, with the most extreme increases occurring in central Texas coast estuaries beginning in the early 2000's. During the same timeframe, mean lengths of adult specimens significantly decreased in many of the same estuaries. Habitat suitability analysis suggested that Gafftopsail Catfish were primarily influenced by salinity, though they still exist across a very broad range of salinity conditions. Angler catch rates showed some localized patterns of increasing or decreasing trends, though they generally did not follow fishery independent trends for most estuaries.ConclusionThese trends interpreted in the context of the known trophic role of Gafftopsail Catfish imply the potential for larger ecosystem‐level effects on both prey organisms and competitors. A more thorough awareness of these trends and potential interactions should help fisheries managers operate in an ecosystem‐based context when investigating population dynamics and recommending management strategies.

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Section: Discussionmentioning

confidence: 99%

Section: Model and Bay Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gafftopsail Catfish in Texas estuaries: Population trends and ecosystem implications

Cates,

Hale,

Olsen

2024

N American J Fish Manag

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“…For example, previous studies in the northwestern Gulf of Mexico detected an increase in species diversity and changes in the incidence of fish and invertebrate species over time (Fujiwara et al, 2019; Pawluk et al, 2021). As the species diversity increases, the community composition, as well as functional diversity, changes (Pawluk et al, 2022); however, how these changes that resulted from climate change still remain to be investigated.…”

Section: Introductionmentioning

confidence: 99%

Life‐history traits and temporal patterns in the incidence of coastal fishes experiencing tropicalization

et al. 2022

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Climate change is causing shifts in the geographic distributions of coastal fish species toward higher latitudes. However, local fish communities found in higher latitudes today are not simply those found in lower latitudes in the past because the sensitivity of species to various environmental conditions is different. Responses of fish to environmental conditions differ depending on their life-history traits such as the maximum population growth rate, age of maturity, and generation time because these traits are constrained by environmental conditions. Here, we investigate associations among temporal patterns in presence-absence (incidence) data, life-history traits of species, and environmental conditions to elucidate the potential mechanisms behind the effects of climate change on coastal fish communities. In this study, fish monitoring data collected semi-monthly between 1982 and 2019 from eight major bays in the northwestern Gulf of Mexico were analyzed with generalized additive models. Smooth patterns over seasons and years in the incidence data of 77 species were estimated, and the data were associated with environmental variables. Further, these temporal patterns were associated with the life-history traits of species. The results show that species that are more common in the summer months (non-winter spawners) tend to exhibit an increasing trend and that species common during the spring (winter spawners) tend to exhibit a decreasing trend, suggesting the importance of summer conditions in driving tropicalization. Salinity had significant effects on species in general, and longer-lived species tended to be affected by temperature. These results suggest seasonal differences in the effects of environmental conditions and variation in sensitivity to environmental conditions among different life-history strategies. These findings represent major steps toward understanding the mechanisms behind the tropicalization of estuarine communities.

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