Presentation Title

Effect of temperature fluctuations on larval function of the Baja California chorus frog, Pseudacris hypochondriaca

Faculty Mentor

Dr. Casey A. Mueller

Start Date

23-11-2019 10:00 AM

End Date

23-11-2019 10:45 AM

Location

73

Session

poster 3

Type of Presentation

Poster

Subject Area

biological_agricultural_sciences

Abstract

Effect of temperature fluctuations on larval function of the Baja California chorus frog, Pseudacris hypochondriaca

Marie Ramirez, Samantha Manzanares, Casey A. Mueller

ABSTRACT

Environmental temperature has an extensive impact on the phenotypes of all animals. Given this, temperature fluctuations during developmental stages may then also cause profound effects on physiological phenotypes of animals, especially for ectotherms like amphibians. This study tested this hypothesis by evaluating the effects of temperature fluctuations during the larval development of the eurythermal Baja California chorus frogs (Pseudacris hypochondriaca), a species native to southern California and northern Baja California. Eggs were collected from ponds in San Marcos, California within 24 hours of fertilization and separated into four temperature treatments: 15°C constant, and fluctuating treatments over 24 hours of 10°C - 20°C, 12.5°C - 17.5°C, and 15°C - 25°C. Oxygen consumption rate (VO2), critical thermal maximum (CTMAX), and swim speed velocity were measured for tadpoles at 15°C during hindlimb toe development. Relative to mass-specific VO2 at 15°C constant, mass-specific VO2 showed a slight increase in 12.5°C - 17.5°C, a larger increase in 10°C - 20°C, but no difference in 15°C - 25°C. Relative to the CTMAX at 15°C constant, CTMAX remained unchanged in 12.5°C - 17.5°C, slightly increased in 10°C - 20°C, and greatly increased in 15°C - 25°C. Swim speed was similar across all temperature treatments. Overall, greater fluctuations had stronger effects on larval VO2 and CTMAX and tadpoles tend to acclimate to higher temperatures during daily cycles. Acclimation in thermal tolerance and metabolic rates of this eurythermal amphibian indicates that animals will likely show plasticity in response to the fluctuating temperatures predicted to occur with climate change.

Keywords: amphibians, development, fluctuating temperature, metabolism, plasticity, thermal tolerance, swim speed

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Nov 23rd, 10:00 AM Nov 23rd, 10:45 AM

Effect of temperature fluctuations on larval function of the Baja California chorus frog, Pseudacris hypochondriaca

73

Effect of temperature fluctuations on larval function of the Baja California chorus frog, Pseudacris hypochondriaca

Marie Ramirez, Samantha Manzanares, Casey A. Mueller

ABSTRACT

Environmental temperature has an extensive impact on the phenotypes of all animals. Given this, temperature fluctuations during developmental stages may then also cause profound effects on physiological phenotypes of animals, especially for ectotherms like amphibians. This study tested this hypothesis by evaluating the effects of temperature fluctuations during the larval development of the eurythermal Baja California chorus frogs (Pseudacris hypochondriaca), a species native to southern California and northern Baja California. Eggs were collected from ponds in San Marcos, California within 24 hours of fertilization and separated into four temperature treatments: 15°C constant, and fluctuating treatments over 24 hours of 10°C - 20°C, 12.5°C - 17.5°C, and 15°C - 25°C. Oxygen consumption rate (VO2), critical thermal maximum (CTMAX), and swim speed velocity were measured for tadpoles at 15°C during hindlimb toe development. Relative to mass-specific VO2 at 15°C constant, mass-specific VO2 showed a slight increase in 12.5°C - 17.5°C, a larger increase in 10°C - 20°C, but no difference in 15°C - 25°C. Relative to the CTMAX at 15°C constant, CTMAX remained unchanged in 12.5°C - 17.5°C, slightly increased in 10°C - 20°C, and greatly increased in 15°C - 25°C. Swim speed was similar across all temperature treatments. Overall, greater fluctuations had stronger effects on larval VO2 and CTMAX and tadpoles tend to acclimate to higher temperatures during daily cycles. Acclimation in thermal tolerance and metabolic rates of this eurythermal amphibian indicates that animals will likely show plasticity in response to the fluctuating temperatures predicted to occur with climate change.

Keywords: amphibians, development, fluctuating temperature, metabolism, plasticity, thermal tolerance, swim speed