Validation of 22 Sodium Turnover in Estimating Sodium and Food Intake in an Amphibian (Bufo marinus)

Green, Brian; Libke, John; Mitchell, Nicola; Newgrain, Keith

doi:10.2307/1447496

Copeia

1999

DOI: 10.2307/1447496

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Validation of 22 Sodium Turnover in Estimating Sodium and Food Intake in an Amphibian (Bufo marinus)

Brian Green¹,

John Libke²,

Nicola Mitchell³

et al.

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“…Assuming that all 23 Na intake is from dietary sources (i.e. food, rather than water), then volumes of food consumed can be estimated from the 23 Na content of the most common food sources available [24][25][26]. Hence, using the two radioisotopes in combination allows measurement of both VCO 2 and food intake.…”

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Landscape context alters cost of living in honeybee metabolism and feeding

et al. 2017

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Field metabolic rate (FMR) links the energy budget of an animal with the constraints of its ecosystem, but is particularly difficult to measure for small organisms. Landscape degradation exacerbates environmental adversity and reduces resource availability, imposing higher costs of living for many organisms. Here, we report a significant effect of landscape degradation on the FMR of free-flying Apis mellifera , estimated using 86 Rb radio-isotopic turnover. We validated the relationship between 86 Rb k b and metabolic rate for worker bees in the laboratory using flow-through respirometry. We then released radioisotopically enriched individuals into a natural woodland and a heavily degraded and deforested plantation. FMRs of worker bees in natural woodland vegetation were significantly higher than in a deforested landscape. Nectar consumption, estimated using 22 Na radio-isotopic turnover, also differed significantly between natural and degraded landscapes. In the deforested landscape, we infer that the costs of foraging exceeded energetic availability, and honeybees instead foraged less and depended more on stored resources in the hive. If this is generally the case with increasing landscape degradation, this will have important implications for the provision of pollination services and the effectiveness and resilience of ecological restoration practice.

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Landscape context alters cost of living in honeybee metabolism and feeding

et al. 2017

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Validation of 22 Sodium Turnover in Estimating Sodium and Food Intake in an Amphibian (Bufo marinus)

Cited by 1 publication

References 14 publications

Landscape context alters cost of living in honeybee metabolism and feeding

Landscape context alters cost of living in honeybee metabolism and feeding

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