Factors Mediating Co‐Occurrence of an Economically Valuable Introduced Fish and Its Native Frog Prey

Hartman, Rosemary; Pope, Karen L.; Lawler, Sharon P.

doi:10.1111/cobi.12218

Cited by 14 publications

(10 citation statements)

References 44 publications

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“…In contrast to the mitigating effect of habitat complexity on multitrophic interactions within habitats (Hartman et al. ), increasing landscape complexity is expected to reinforce multitrophic interactions between habitats by creating edge habitat, potentially completely excluding mesopredators from suitable habitats.…”

Section: Discussionmentioning

confidence: 98%

Intraguild predator drives forest edge avoidance of a mesopredator

et al. 2016

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Abstract.Interactions between top predators and mesopredators of the same guild often result in habitat segregation restricting interactions to shared habitat edges. Although negative edge effects are recognized as important spatial patterns in the ecology of fragmented landscapes, the underlying mechanisms of predator-prey interactions resulting in negative edge effects remain unknown. To disentangle top-down effects of intraguild predators and bottom-up effects of shared resources on mesopredator spatial distribution, we recorded the occurrence of tawny owls Strix aluco in forests and their prey, the little owl Athene noctua in adjacent open areas over 2 yr across 687 km 2 in Southern Germany. We developed a new, asymmetrical dynamic two-species occupancy model investigating spatial interactions while accounting for imperfect detection. Little owl occupancy was strongly reduced within 150 m of forests, but only in the presence of tawny owls. Analysis of over 30 000 telemetry locations of 275 little owls showed that little owls strongly avoided areas closer than 150 m from the forest during range use. These results suggest that the negative edge effect is due to forest edge avoidance rather than direct predation. Potential confounding mechanisms such as food depletion or habitat avoidance at forest edges can be ruled out. Thus, top-down effects caused by avoidance of intraguild top predators shape the spatial distribution of mesopredators such as the little owl. While habitat complexity mitigates multitrophic interactions within habitats, it is expected to reinforce multitrophic interactions between habitats, potentially leading to the suppression of mesopredators from suitable habitats.

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Section: Discussionmentioning

confidence: 98%

Intraguild predator drives forest edge avoidance of a mesopredator

et al. 2016

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“…Within‐pond physical heterogeneity and vegetation structure can increase availability of refugia from predators and diffuse competition (Hartman et al. , Anderson and Semlitsch , Kenison et al. ).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, native-invasive interactions can be intensified or mediated by local and landscape habitat characteristics including climate (Melbourne et al 2007. Within-pond physical heterogeneity and vegetation structure can increase availability of refugia from predators and diffuse competition (Hartman et al 2014, Anderson and Semlitsch 2016, Kenison et al 2016. Dominant plant species, such as invasive reed canarygrass (Phalaris arundinacea), can affect both native and invasive amphibians by modifying wetland structure and function, prey resources, and water chemistry (Spyreas et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Disentangling effects of invasive species and habitat while accounting for observer error in a long‐term amphibian study

et al. 2019

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The invasive American bullfrog (Lithobates catesbeianus) and a variety of non‐native sport fish commonly co‐occur in lowland lentic habitats of the western United States. Both invasive taxa are implicated in declines of native amphibians in this region, but few long‐term studies of communities exist. Further, field studies of invasive–native interactions are complicated by confounding habitat modifications and observation errors. We surveyed amphibians and measured habitat characteristics for 12 yr across 38 wetland sites within the Willamette Valley, Oregon, USA. We assessed the influence of invasive species, habitat, and their interactions on the distributions of five native amphibian species using a multispecies dynamic occupancy model that accounted for false‐negative and false‐positive detections. In general, habitat characteristics—such as within‐pond vegetation cover, surrounding forest, and drought severity—were important for local persistence of native species when bullfrogs co‐occurred. We also found evidence of a cumulative negative effect of bullfrogs and non‐native fish (families Centrarchidae and Ictaluridae) on northern red‐legged frog (Rana aurora) local persistence that was mediated by the dominance of invasive reed canarygrass (Phalaris arundinacea). Non‐native fish and bullfrogs had variable effects on native amphibian species, but neither invasive taxon appears to be causing declines in occupied sites within our study area. Moreover, species relationships with habitat differed when invaders were present, indicating that certain habitats may increase persistence of native amphibians in the invaded landscape.

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“…A tadpole caging experiment with Sierra Nevada yellow-legged frogs (R. sierrae) confirmed that predation of larvae is an important mechanism for the negative effect of trout on frogs (Vredenburg 2004). Notably, the presence of physical refugia from predation (shallow littoral zones and emergent vegetation) is associated with Cascades frog persistence in lakes occupied by introduced trout (Hartman et al 2014). Not all amphibian species are susceptible to predation by trout.…”

Section: Amphibiansmentioning

confidence: 91%

Variation in reciprocal subsidies between lakes and land: perspectives from the mountains of California

Piovia‐Scott

Sadro

Knapp³

et al. 2016

Can. J. Fish. Aquat. Sci.

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Lakes are connected to surrounding terrestrial habitats by reciprocal flows of energy and nutrients. We synthesize data from California's mountain lake catchments to investigate how these reciprocal subsidies change along an elevational gradient and with the introduction of a top aquatic predator. At lower elevations, well-developed terrestrial vegetation provides relatively large inputs of organic material to lakes, whereas at higher elevations, the paucity of terrestrial vegetation provides minimal organic input but allows for higher inputs of inorganic nitrogen. There are also pronounced elevational patterns in amphibians and aquatic insects, which represent important vectors for resource flows from lakes back to land. The introduction of trout can reduce this lake-to-land resource transfer, as trout consume amphibians and aquatic insects. We propose a conceptual model in which within-lake processes influence terrestrial consumers at higher elevations, while terrestrial inputs govern within-lake processes at lower elevations. This model contributes to a more general understanding of the connections between aquatic and terrestrial habitats in complex landscapes.Résumé : Les lacs sont reliés aux habitats terrestres qui les entourent par des flux réciproques d'énergie et de nutriments. Nous mettons en rapport des données tirées de bassins versants de lacs de montagne en Californie pour étudier les variations de ces apports réciproques le long d'un gradient altitudinal et après l'introduction d'un prédateur aquatique de niveau trophique supérieur. À basse altitude, une végétation terrestre bien développée fournit de relativement grands apports de matière organique aux lacs, alors qu'à plus haute altitude, la rareté de la végétation terrestre fournit peu d'apports organiques, mais permet des apports d'azote inorganique plus importants. Des variations altitudinales marquées sont également observées chez les amphibiens et les insectes aquatiques, qui représentent d'importants vecteurs pour les flux de ressources des lacs vers la terre. L'introduction de truites peut réduire ce transfert de ressources des lacs vers la terre, puisque les truites consomment des amphibiens et des insectes aquatiques. Nous proposons un modèle conceptuel dans lequel les processus internes des lacs influencent les consommateurs terrestres à plus haute altitude, alors que les apports terrestres régissent les processus internes des lacs de plus basse altitude. Ce modèle participe à une compréhension plus générale des liens entre les habitats aquatiques et terrestres dans des paysages complexes. [Traduit par la Rédaction]

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Factors Mediating Co‐Occurrence of an Economically Valuable Introduced Fish and Its Native Frog Prey

Cited by 14 publications

References 44 publications

Intraguild predator drives forest edge avoidance of a mesopredator

Intraguild predator drives forest edge avoidance of a mesopredator

Disentangling effects of invasive species and habitat while accounting for observer error in a long‐term amphibian study

Variation in reciprocal subsidies between lakes and land: perspectives from the mountains of California

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