Biases in Trapping Larval Amphibians in Playa Wetlands

Ghioca, Dana M.; Smith, Loren M.

doi:10.2193/2005-633

Cited by 9 publications

(1 citation statement)

References 28 publications

(36 reference statements)

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“…The literature contains contradictory recommendations about sampling methods where sometimes funnel traps are preferred (Fennessy et al 1998) and sometimes dip netting is preferred (Ghioca & Smith 2005). In this study, dip netting seemed to be an effective way to monitor small pools, but in large pools, there may be greater opportunity for escape of larger organisms so funnel traps were more effective.…”

Section: Discussionmentioning

confidence: 99%

Hydrology, Physiochemistry, and Amphibians in Natural and Created Vernal Pool Wetlands

Korfel

Mitsch²,

Hetherington

et al. 2009

Restoration Ecology

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This study compared the hydrology, physiochemistry, and amphibian biomass between a complex of created vernal pools and a complex of natural vernal pools in 2007 in central Ohio, United States. Hydrologic connectivity of surface water and groundwater differed between the natural and the created pool complexes. Surface inundation duration for created pools exceeded that of natural pools, although spring water depths were similar. Dissolved oxygen (p ¼ 0.05) and hourly temperature (p ¼ 0.00) were 1.2% and 1.1% higher, respectively, in the created pools, and conductivity was 1.5% higher (p ¼ 0.00) in the natural pools. Amphibian dip net results found no significant difference in biomass between natural and created pools or family (hylid, ranid, and ambystomatid) biomass in both pool types. Amphibian families were evenly represented by both capture methods in the created wetlands; however, the distribution of families was not even in natural pools and the proportion of ranids was four times greater for samples obtained by funnel traps than dip netting. Eleven years after construction, the created vernal pools did not mimic natural pools in surface inundation and groundwater-surface water exchange, dissolved oxygen, and water temperature. The created pools are perched wetlands and are never likely to mimic reference pool hydrology. Dissolved oxygen and temperature differences are likely due to the separation of surface water and groundwater in the created pools. However, the created pools exhibited a higher taxa diversity than the natural pools due to a more even distribution of organisms between the three families.

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Section: Discussionmentioning

confidence: 99%

Hydrology, Physiochemistry, and Amphibians in Natural and Created Vernal Pool Wetlands

Korfel

Mitsch²,

Hetherington

et al. 2009

Restoration Ecology

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The effect of survey method on the detection probabilities of frogs and tadpoles in large wetland complexes

Wassens

Hall

Spencer³

2017

Mar. Freshwater Res.

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Knowledge of the probability of detecting a species with a given survey effort is important when planning monitoring programs. The present paper compares detection probabilities for six survey methods: audio-visual transect surveys targeting adult frogs, and sweep netting, bait traps, small fyke nets, large fyke nets and seine netting targeting tadpoles. Data were drawn from repeat surveys of 16 wetlands over a 3-year period (2008–2011). Detection probabilities of each method and species combination were determined by maximum likelihood estimation. Audio-visual surveys targeting adults had a higher probability of detecting individual species than did methods targeting their tadpoles. However, the presence of adults was a reasonably poor indicator of the presence of their tadpoles on any given survey occasion. Of the methods employed to target tadpoles, large and small fyke nets had a significantly higher probability of detecting tadpoles of all species than did bait traps, seining or sweep nets. Differences in the detection probability of different methods demonstrated that the choice of survey method can bias towards particular groups of species and, in some cases, underestimate breeding activity by frog species in large waterbodies.

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Roadkills as a complementary information source for biological surveys using rodents as a model

González-Gallina¹,

Benítez-Badillo²,

Hidalgo‐Mihart³

et al. 2015

Journal of Mammalogy

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Roads affect wildlife in many ways, with roadkills probably the most conspicuous. In Mexico, there is increasing interest in this effect on wildlife. Together, richness and abundance can be used to predict trends for wild populations, and our study analyzes these variables for rodents killed by vehicles and trapped along a 14-km stretch of an A-type roadway in Veracruz, Mexico, from June 2010 to March 2011. Our study area had 2 habitat types: shrubland on lava flow and grassland. Over the course of the study, we monitored this stretch of highway by car for 34 days of effective sampling. When we spotted an animal, we stopped to record it. In the surrounding habitats, traps were set for 28 nights with 36 traps per habitat (total effort: 1,008 trap nights). The richness of trapped rodents was 9 species and for roadkills it was 14. The 2 sampling methods shared 7 species. The differential contribution was 2 species in trapping and 7 in roadkills. The complementarity index was 99.36. For both methods, the dominant species were mice of the genus Peromyscus ( Peromyscus difficilis for the shrubland and Peromyscus maniculatus for the grassland). Roadkills were a very representative source of information for the purposes of biological inventory and even for identifying the dominance pattern in species composition, thus offered a useful method for supplementing information obtained from traditional trapping. Highways threaten biodiversity mainly because they fragment habitats and further expose other habitats to impact by humans, but also because of their potential as a direct mortality factor. Careful interpretation of roadkill data can be a useful tool whose value for biologists has not yet been fully appreciated. Los caminos afectan a la fauna silvestre de muchas maneras, probablemente la más conspicua son los atropellamientos. En México, recientemente, algunos estudios comienzan a señalar con mayor interés el problema. Este estudio se enfoca en evaluar la riqueza y abundancia de roedores atropellados a lo largo de un segmento de 14 km de la carretera tipo A2 en el estado de Veracruz, abarcando desde junio de 2010 hasta marzo del 2011, Además, estos pueden predecir las tendencias de las poblaciones silvestres que habitan en la zona aledaña, compuesta por dos hábitats: malpaís y un llano. Durante el estudio, el camino se revisó desde el auto durante 34 días efectivos de muestreo carretero y un total de 28 noches de trampeo, que representa un esfuerzo de 1008 noches/trampa. Se obtuvo una riqueza de roedores de nueve especies por trampeo contra 14 encontradas atropelladas, con siete especies compartidas entre métodos. La contribución diferencia fue de dos especies por trampeo y siete por atropellamiento. Se obtuvo un índice de complementariedad de 99.36. Las especies dominantes en ambos métodos fueron los ratones del género Peromyscus ( P. difficilis para el malpaís y P. maniculatus para el llano). Los atropellamientos fueron una fuente eficiente de información biológica para inventarios e incluso permitieron identificar patrones de dominancia en la composición de especies. Por tanto, resaltamos su valor complementario a métodos tradicionales de trampeo. Las carreteras represantan una amenaza para la biodiversidad principalmente por que causan fragmentación de los hábitats exponiendo así más de estos al impacto humano, pero también por su potencial como un factor de mortalidad. Podemos explotar esto mediante la cuidadosa interpretación de información proporcionada por los atropellamientos, convirtiéndose en una herramienta útil para biólogos que hasta la fecha ha sido menospreciada.

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Biases in Trapping Larval Amphibians in Playa Wetlands

Cited by 9 publications

References 28 publications

Hydrology, Physiochemistry, and Amphibians in Natural and Created Vernal Pool Wetlands

Hydrology, Physiochemistry, and Amphibians in Natural and Created Vernal Pool Wetlands

The effect of survey method on the detection probabilities of frogs and tadpoles in large wetland complexes

Roadkills as a complementary information source for biological surveys using rodents as a model

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