Hyperolius davenporti Loader, Lawson, Portik & Menegon, 2015
|Species Description: Loader SP, Lawson LP, Portik DM, Menegon M 2015 Three new species of spiny throated reed frogs (Anura: Hyperoliidae) from evergreen forests of Tanzania. BMC Res Notes 8:167|
Hyperolius davenporti can be differentiated from other species within the genus through a few unique characteristics. To begin with, H. davenporti is the only species in its genus with black dermal asperities on its ventrum. Individuals from the species also have evenly distributed asperities on their gular flaps, which it shares in common with H. burgessi and H. spinigularis (Loader et al. 2015, Barratt et al. 2017). The gular flap of H. davenporti can be distinguished from other species in that it is not narrow and equal in length anteriorly and posteriorly. Furthermore, the height of the gular flap is much larger than its width (Loader et al. 2015).
Hyperolius davenporti generally has brown dorsal coloration with darker spots speckled along the back. Most preserved specimens also possess white stripes with dark edges that run along the sides of the body and converge on the tip of the snout. The ventral side is much lighter than the dorsal side, with shades of cream and beige. However, differences within the species have been noted, with certain individuals having the same pattern of coloration, but with shades of yellow. The asperities on the dorsum, gular region, and ventral surface are black (Loader et al. 2015).
Sexual dimorphism exists in that females tend to have a much larger body size than their male counterparts. The black asperities are also less pronounced on the female dorsum and nonexistent on their ventral sides. During the breeding season, males can be differentiated from females by their more rounded and wider gular sacs (Loader et al. 2015).
Distribution and Habitat
Country distribution from AmphibiaWeb's database: Tanzania, United Republic of
Life History, Abundance, Activity, and Special Behaviors
As of 2021, no mating or territorial calls have been reported in this species. However, the area was only surveyed for five days, which was not enough time to definitively conclude whether H. davenporti is non-calling like its congeners H. burgessi and H. spinigularis (Loader et al. 2015).
As of 2021, there are no detailed observations about H. davenporti’s life history, reproductive mode, and larval morphology. However, other species within Hyperolius have a lifespan of 1 to 4 years and low lifetime fecundity. In terms of breeding biology, Hyperolius species generally become sexually mature at a small size. Hyperolius davenporti is presumed to undergo indirect development with oviparity, production of larvae, and metamorphosis (Sinsch and Dehling 2017). Though there is not much information on H. davenporti’s reproductive mode, its closely related sister species, H. burgessi, breeds during annual rainy seasons, lays its eggs on flora suspended above ponds or swamps, and has a typical clutch size of 89 eggs (Loader et al. 2015). No information has been collected about H. davenporti’s adult or larval diet, activity, or predators.
Trends and Threats
Possible reasons for amphibian decline
General habitat alteration and loss
Maximum Likelihood and Bayesian methods were utilized on one mitochondrial gene (NADH dehydrogenase subunit 2) and three nuclear genes (POMC, C-myc, and Rag-1). The resulting tree found H. davenporti was sister to H. burgessi (Loader et al. 2015). In 2017, Barratt et al. recalculated the phylogenetic relationships using the same genes as Loader et al. with H. mitchelli as the outgroup. Their Bayesian and Maximum Likelihood approaches supported the phylogeny constructed by Loader et al. in placing H. davenporti as sister to H. burgessi (Barratt et al. 2017).
Hyperolius davenporti is distributed allopatrically relative to its congeners (Loader et al. 2015) and is potentially a result of peripatric speciation events from its sister lineages (Lawson et al. 2015).
The species is named after scientist Dr. Tim Davenport, who made significant contributions to the conservation of rainforests in Tanzania, specifically the forests of the Southern Highlands and the Livingstone Mountains (Loader et al. 2015).
Barratt, C. D., Lawson, L. P., Bittencourt-Silva, G.B., Doggart, N., Morgan-Brown, T., Nagel, P., Loader, S. P. (2017). “A new, narrowly distributed, and critically endangered species of spiny‐throated reed frog (Anura: Hyperoliidae) from a highly threatened coastal forest reserve in Tanzania.” Herpetological Journal 27, 13–24 [link]
IUCN SSC Amphibian Specialist Group. (2016). "Hyperolius davenporti." The IUCN Red List of Threatened Species 2016: e.T69119609A69119652. https://dx.doi.org/10.2305/IUCN.UK.2016-1.RLTS.T69119609A69119652.en. Downloaded on 17 February 2021.
Lawson, L.P., Bates, J.M., Menegon, M., Loader, S.P. (2015). “Divergence at the edges: peripatric isolation in the montane spiny throated reed frog complex.” BMC Evolutionary Biology, 15(128): 1-15. [link]
Loader, S.P., Lawson, L.P., Portik, D.M., Menegon, M. (2015). “Three new species of spiny throated reed frogs (Anura: Hyperoliidae) from evergreen forests of Tanzania.” BMC Research Notes, 8(167): 1-16. [link]
Sinsch, U., Dehling, J.M. (2017). “Tropical anurans mature early and die young: Evidence from eight Afromontane Hyperolius species and a meta-analysis.” PLoS One 12(2): e0171666. [link]
Stevens, R.A. (1971). ''A new treefrog from Malawi (Hyperoliinae, Amphibia).'' Zoologica Africana, 6, 313-320.
Originally submitted by: Irene Qin, Richard Ma, James (Gi Heon) Choi (2021-11-17)
Description by: Irene Qin, Richard Ma, James (Gi Heon) Choi (updated 2021-11-17)
Distribution by: Irene Qin, Richard Ma, James (Gi Heon) Choi (updated 2021-11-17)
Life history by: Irene Qin, Richard Ma, James (Gi Heon) Choi (updated 2021-11-17)
Trends and threats by: Irene Qin, Richard Ma, James (Gi Heon) Choi (updated 2021-11-17)
Comments by: Irene Qin, Richard Ma, James (Gi Heon) Choi (updated 2021-11-17)
Edited by: Ann T. Chang (2021-11-17)
Species Account Citation: AmphibiaWeb 2021 Hyperolius davenporti <https://amphibiaweb.org/species/8351> University of California, Berkeley, CA, USA. Accessed Sep 22, 2023.
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Citation: AmphibiaWeb. 2023. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 22 Sep 2023.
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