Aggregation and site tenacity under downed logs in Salamandrella keyserlingii (Caudata: Hynobiidae)

Hasumi, Masato; Hongorzul, Tsagaan; Nakagawa, Masahiro

doi:10.1007/s00300-013-1443-0

Cited by 5 publications

(3 citation statements)

References 41 publications

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“…These mountains are located at the northern part of Hakuba‐mura, Nagano Prefecture, Japan. We distinguished gravid females from males by presence of yellowish maturing follicles in the ovaries of females, as well as beige oviducts and ovisacs (i.e., homologous uteri; see Hasumi, ), visible through the skin of the ventral side of the trunk (e.g., Hasumi & Borkin, ; Hasumi, Hongorzul, & Nakagawa, ; Hasumi, Hongorzul, & Terbish, ). We secondly used sexual dimorphism in shapes of hindlimbs and cloacae for identifying sexes (Akita & Miyazaki, ; Kakegawa et al, ; Kakegawa & Hasumi, unpublished data).…”

Section: Methodsmentioning

confidence: 99%

Effects of controlled water temperatures on oviposition in a lotic‐breeding and externally fertilizing salamander (Hynobius kimurae)

Kakegawa

Hasumi

2017

River Research & Apps

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Warm or cool ambient temperatures during winter generate plasticity in the within-year timing of oviposition or breeding phenology shifts through the use of a reaction norm in many riverine ectotherms, but within-year timing of oviposition in Hynobius kimurae (Caudata: Hynobiidae) is predicted to be constant at different water temperatures of a mountain stream. To clarify this difference, by experimentally controlling water temperatures from fall to spring and thus changing durations of aquatic hibernation and dates of oviposition, we determined whether oviposition is more advanced when water temperatures increase earlier than usual or is more delayed when water temperatures increase later than usual. Oviposition was more delayed than usual with earlier exposure to high water temperatures during spring and was earlier than usual with exposing to higher water temperatures during hibernation. Days from submergence to oviposition were responsive to cumulative daily water temperatures from submergence to oviposition within a population. A rate of increase in days from submergence to oviposition was different between populations but was constant within a population even if minimal water temperatures varied each year. When running a program of a Markov chain Monte Carlo generalized linear mixed model for Bayesian computation to interpret confounding effects, neither different treatments nor different years statistically affected days from submergence to oviposition. These results suggest that a biological clock exits for days from submergence to oviposition in H. kimurae, which could allow survival in situations with either warmer or cooler environments.

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Section: Methodsmentioning

confidence: 99%

Effects of controlled water temperatures on oviposition in a lotic‐breeding and externally fertilizing salamander (Hynobius kimurae)

Kakegawa

Hasumi

2017

River Research & Apps

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“…Although it is still unknown whether male and female H. kimurae retreat to subterranean burrows (Hasumi et al, 2009) or under cover objects such as decaying logs and woody debris (Hasumi et al, 2014) in their terrestrial habitats (i.e., many references have described their retreats by guesswork: e.g., Goris & Maeda, 2004;Sato, 1943), they immigrated to aquatic hibernacula during fall in our population. This is the case in other populations examined (e.g., Akita, 2001;Akita & Miyazaki, 2009;M.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 87%

“…Sengen‐yama, in the northern part of Hakuba‐mura, Nagano Prefecture, Japan (36.73°N, 137.88°E; 840 m elevation), during November 2005, 2012 and 2013. We distinguished gravid females from males by presence of yellowish maturing follicles in the ovaries of females, as well as beige oviducts and ovisacs (i.e., homologous uteri; see Hasumi, 1996b), visible through the skin of the ventral side of the trunk (e.g., Hasumi & Borkin, ; Hasumi, Hongorzul, & Nakagawa, ; Hasumi, Hongorzul, & Terbish, ). We identified sexes secondly with sexually dimorphic, external morphology of cloacae and shape of hindlimbs (Figure ).…”

Section: Methodsmentioning

confidence: 99%

A lotic‐breeding salamander (Hynobius kimurae) modifies physiological and morphological traits during wintering

Kakegawa

Hasumi²

2017

Acta Zoologica

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Unlike other migratory salamanders, Hynobius kimurae moves to aquatic hibernacula during fall. Does submergence into water during fall induce changes in physiological and morphological traits? We investigated whether such changes occur in both sexes from the entrance into the water (November) to the exit from the water (May) in the laboratory. Mean duration of stay in the water was 21.7 weeks in males and 19.0 weeks in females. Spermiation began 13.8 weeks after the males entered the water. Sperm storage lasted for 6.3 weeks. Spawning occurred 18.3 weeks after the females entered the water. Cloacae swelled greatly soon after the sexes entered the water. In males after entering the water, tail shape changed from sticklike to finlike. Although physiological and morphological traits in other species change simultaneously in both the submergence into water and the onset of breeding activity only during spring, such changes occurred in individual H. kimurae firstly during fall (shortly after entering the water) and secondly during spring (shortly after awaking from hibernation). This difference suggests that these two‐step changes during a prolonged period (fall–spring) are concentrated in a short period of aquatic‐breeding activity during spring in other species with terrestrial hibernation and associated reproductive cycles.

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Social interactions during the aquatic breeding phase of the family Hynobiidae (Amphibia: Caudata)

Hasumi

2015

acta ethol

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Aggregation and site tenacity under downed logs in Salamandrella keyserlingii (Caudata: Hynobiidae)

Cited by 5 publications

References 41 publications

Effects of controlled water temperatures on oviposition in a lotic‐breeding and externally fertilizing salamander (Hynobius kimurae)

Effects of controlled water temperatures on oviposition in a lotic‐breeding and externally fertilizing salamander (Hynobius kimurae)

A lotic‐breeding salamander (Hynobius kimurae) modifies physiological and morphological traits during wintering

Social interactions during the aquatic breeding phase of the family Hynobiidae (Amphibia: Caudata)

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