Effectiveness and outcomes of invasive species removal in Hawaiian streams

Moody, Kristine N.; Scherer, Avery E.; O'Connor, D.A.; Heim-Ballew, Heidi; Lisi, Peter J.; Hogan, J. Derek; McIntyre, Peter B.; Blum, Michael J.

doi:10.1007/s10530-021-02468-w

Cited by 7 publications

(9 citation statements)

References 88 publications

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“…Though partial migration has the potential to enhance population resilience, it is becoming increasingly evident that conservation efforts are necessary to sustain the endemic species inhabiting Hawaiian streams. Widespread urbanization, water abstraction, climate change, and invasive species are depressing several other gobies across the Hawaiian archipelago (Moody et al, 2017 , 2021 ; Walter et al, 2012 ). Moreover, since all of these species are at least partially amphidromous, each may be sensitive to variation in both stream flows and ocean currents in the fashion documented herein.…”

Section: Discussionmentioning

confidence: 99%

“…Yet for species with partial migrations, preserving connectivity to enable consistent population rescue via marine dispersal may be less valuable than improving stream habitat quality because both the growth and reproductive phases of the life cycle can occur in streams. Thus, prioritization of management approaches and watersheds should be informed by surveys of life history variation within species (Heim‐Ballew et al, 2020 ), and interventions to improve stream habitat quality should account for whether focal species are lifelong residents or not (Moody et al, 2021 ). Preserving diversity in ecosystems requires considering a well‐balanced combination of options, including broad precautionary measures intended to counter the unpredictability of natural environments (Schindler & Hilborn, 2015 ).…”

Section: Discussionmentioning

confidence: 99%

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Stream and ocean hydrodynamics mediate partial migration strategies in an amphidromous Hawaiian goby

Lisi

Hogan

Holt

et al. 2022

Ecology

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Partial migration strategies, in which some individuals migrate but others do not, are widely observed in populations of migratory animals. Such patterns could arise via variation in migratory behaviors made by individual animals, via genetic variation in migratory predisposition, or simply by variation in migration opportunities mediated by environmental conditions. Here we use spatiotemporal variation in partial migration across populations of an amphidromous Hawaiian goby to test whether stream or ocean conditions favor completing its life cycle entirely within freshwater streams rather than undergoing an oceanic larval migration. Across 35 watersheds, microchemical analysis of otoliths revealed that most adult Awaous stamineus were freshwater residents (62% of n = 316 in 2009, 83% of n = 274 in 2011), but we found considerable variation among watersheds. We then tested the hypothesis that the prevalence of freshwater residency increases with the stability of stream flows and decreases with the availability of dispersal pathways arising from ocean hydrodynamics. We found that streams with low variation of daily discharge were home to a higher incidence of freshwater residents in each survey year. The magnitude of the shift in freshwater residency between survey years was positively associated with predicted interannual variability in the success of larval settlement in streams on each island based on passive drift in ocean currents. We built on these findings by developing a theoretical model of goby life history to further evaluate whether mediation of migration outcomes by stream and ocean hydrodynamics could be sufficient to explain the range of partial migration frequency observed across populations. The model illustrates that the proportion of larvae entering the ocean and differential survival of freshwater-resident versus ocean-going larvae are plausible mechanisms for range-wide shifts in migration strategies. Thus, we propose that hydrologic variation in both ocean and stream environments contributes to spatiotemporal variation in the prevalence of migration phenotypes in A. stamineus. Our empirical and theoretical results suggest that the capacity for partial migration could

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Stream and ocean hydrodynamics mediate partial migration strategies in an amphidromous Hawaiian goby

Lisi

Hogan

Holt

et al. 2022

Ecology

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“…Functional eradication strategies will only be possible in situations where suppression methods reduce invader populations at a rate that exceeds recolonization (Beric and Maclsaac 2015 ). Thus, a critical step in controlling invasive species populations is determining the efficacy of suppression methods (e.g., Pennock et al 2018 ), particularly with respect to recolonization rates from locations outside of the control area (Moody et al 2021 ).…”

Section: Introductionmentioning

confidence: 99%

“…Blanton et al ( 2020 ) applied fishery stock assessment models to SAC removal data and found that spearfishing tournaments effectively suppress SAC biomass; however, additional research is needed to determine movement of SAC and the number of fish that must be removed to contribute to population suppression. In particular, whether or not and to what extent movement by SAC into areas where control efforts are concentrated is of interest (Blanton et al 2020 ; Moody et al 2021 ). We tagged SAC with external and internal tags, released these fish where they were captured within four locations in the upper San Marcos River, and tracked their movements and survival during a community-based spearfishing bounty hunt.…”

Section: Introductionmentioning

confidence: 99%

Movement and mortality of invasive suckermouth armored catfish during a spearfishing control experiment

et al. 2022

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Control of non-native, invasive species in groundwater-dependent ecosystems that are also inhabited by regionally endemic or at-risk species represents a key challenge in aquatic invasive species management. Non-native suckermouth armored catfish (SAC; family Loricariidae) have invaded freshwater ecosystems on a global scale, including the groundwater-dependent upper San Marcos River in Texas, USA. We used passive integrated transponder tags to follow the movements and fates of 65 fish in a 1.6 km spring-fed reach of the upper San Macros River to assess the efficacy of a community-based spearfishing bounty hunt for controlling SAC. We found the weekly probability of SAC survival was negatively correlated with the number of fish removed as a part of the bounty hunt each week ( P = 0.003, R 2 = 0.86), while the probability of SAC being speared and reported was positively correlated with the number of fish removed ( P = 0.011, R 2 = 0.53). The majority of SAC used < 25 m 2 of river over a nine-week tracking period, but the area of river fish used correlated positively with the number of relocations ( P < 0.001, R 2 = 0.36) as might be expected for a population that disperses through diffusive spread. These findings collectively suggest local-scale suppression of the SAC population is possible through community engagement in spearfishing, but over longer time periods immigration might offset some of the removal success. This conclusion provides an explanation for the pattern in which long-term spearfishing tournaments have reduced biomass but ultimately not resulted in eradication of the population. Supplementary Information The online version contains supplementary material available at 10.1007/s10530-022-02834-2.

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“…Mechanical removal through repeated and intense harvests can lead to sustained reductions in invasive species abundances, reducing negative effects to native species, but is often used in combination with other strategies to achieve eradication or suppression targets (Bills and Marking 1988; Hein et al 2006;Howald et al 2007). Most successful examples of mechanical removal have only been demonstrated in small enclosed systems, such as inland lakes, small streams, or islands (Hein et al 2007; Glen et al 2013; Moody et al 2021). Few mechanical removal programs have been evaluated for large interconnected systems, but recolonization from adjacent source populations may introduce an added dimension of complexity for management (Weber et al 2016; Dauphinais et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Evidence of a compensatory response in invasive Rusty Crayfish (Faxonius rusticus) following intensive harvest removal from northern Lake Michigan fish spawning reefs

Kvistad

Galarowicz

Clapp

et al. 2022

Preprint

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The goal of a harvest removal program to control invasive species is usually to achieve sustained reductions in population abundance. Yet removal efforts may be counteracted by density-dependent processes by increasing available resources and reducing stage-specific mortality. We tested a harvest removal strategy for invasive Rusty Crayfish (Faxonius rusticus) focused on nearshore cobble reefs, used by several native fishes as spawning habitats, in Lake Michigan with a before-after control-impact (BACI) study design. We removed 3182 Rusty Crayfish, primarily adults (> 20 mm carapace length), at two sites over two harvest seasons, expending 17,825 trap days in effort. While the BACI analysis results suggested that a statistically significant reduction in Rusty Crayfish densities assessed from diver quadrat surveys was achieved on one reef (Little Traverse Bay Crib), suppression effects were highly variable across sites. In addition, reduced densities were sustained over the egg maturation period for native fish and into the following year after removal ceased. However, by late summer/early fall between consecutive suppression efforts in 2018 and 2019 we observed a threefold increase in pre-removal densities. Size-frequency histograms from diver quadrat surveys showed higher abundance of juvenile size classes over the following spring and summer at Little Traverse Bay Crib compared to its paired reference site, suggesting a compensatory response. Evidence of compensation was corroborated by stock-recruitment analysis and a coincident increase in ovarian egg counts at Little Traverse Bay Crib between 2018 and 2019. With a proviso that we only conducted two seasons of consecutive suppression, our results emphasizes the effects of density-dependent processes in invasive species management and raises questions about efficacy of adult-only removal strategies.

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Effectiveness and outcomes of invasive species removal in Hawaiian streams

Cited by 7 publications

References 88 publications

Stream and ocean hydrodynamics mediate partial migration strategies in an amphidromous Hawaiian goby

Stream and ocean hydrodynamics mediate partial migration strategies in an amphidromous Hawaiian goby

Movement and mortality of invasive suckermouth armored catfish during a spearfishing control experiment

Evidence of a compensatory response in invasive Rusty Crayfish (Faxonius rusticus) following intensive harvest removal from northern Lake Michigan fish spawning reefs

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