Life History Variation in the Spotted Tree Frog, Litoria spenceri (Anura: Hylidae), from Southeastern Australia

Pet management practices of frog and turtle owners in Victoria, Australia

BACKGROUND

Available empirical evidence suggests that pet animals do not always experience an optimal welfare state. However, most pet welfare research has focused on dogs and cats, with less research investigating amphibians and reptiles. The aim of this study was to characterise how owners of pet frogs and turtles in Victoria, Australia, attempted to meet their pets' welfare needs.

METHODS

Pet frog owners (n = 128) and turtle owners (n = 60) completed an online survey, comprising questions about how they managed their pets' environmental, behavioural, social, nutritional and physical health needs.

RESULTS

For both frogs and turtles, positive and negative welfare indicators were found. Owners described pet enclosures as waterproof and escape-proof. However, fewer than 20% of owners of either pet type had an enclosure size that met the minimum standards described in the relevant Code of Practice.

LIMITATIONS

Because this study relied on self-reporting, future research should directly observe animals under household care to provide a more objective measure of welfare.

CONCLUSION

Pet frogs and turtles in Victoria, Australia, may not always be experiencing an optimal welfare state, despite their owners' stated desire to care for them as well as possible.

Temporal stability of an endemic Mexican treefrog

The demographic characteristics of an amphibian population fluctuate independently over time, mainly in response to the temporal variation of environmental factors, especially precipitation and temperature. These temporal fluctuations may contribute to the size of an amphibian population and could be used to determine the current conservation status of a species. During a five year (2004–2008) period, we studied the relative abundance, sex ratio, and age-sex structure of a population of metamorphosed individuals of the endemic treefrog Hyla eximia in Central Mexico. We also studied the species’ relationship with climatic variables such as temperature and precipitation. We found an interannual constant abundance during the study period. However, interannual differences were observed in the population structure by age-sex category (males, females, or juveniles), with decreased abundance of males and juveniles during the rainy months (August–November). The annual abundance of H. eximia was positively correlated with rainfall, but negatively with monthly temperature. We found the sex ratio was male-biased (2:1), except for year 2008. Also, differences in snout-vent length (SVL) were found between years, suggesting changes in recruitment of new individuals. We conclude that variations in abundance, and frequencies by age-sex category, of H. eximia are related to seasonal variations in temperature and precipitation characteristics of temperate zones. However, this temporal stability may suggest that anurans have an unusual capacity to persist even in the face of human-induced habitat change.