Being part of the new funded Collaborative Research Center, we will investigate niche conformance in fire salamander larvae within the next four years. Soon you can find an advertisment for a PHD position here.
I investigate the impact of assortative mating and a potential influence of chemical cues on speciation in a recently diverging fire salamander population. Female fire salamanders, Salamandra salamandra, usually deposit fully developed larvae into first order streams, however in the absence of these specific deposition habitats, females also use temporary ponds.Genetic analysis revealed that two genetic clusters exist which can be linked to the larval habitat. Fire salamanders are only aquatic during the larval stage and adults of both genetic clusters, i.e. larval habitat types can be found together. I investigated whether fire salamanders mate assortativley with respect to their habitat type to prevent gene flow and to maintain the two genetic clusters and whether chemical cues are involved in mate recognition.
In a recent paper we investigated whether fire salamander females exhibit different larval deposition strategies with respect to their habitat linked genotype. We observed that females differed in larval deposition behaviour and maternal investment. Pond-type females extended larval deposition over an increased time period and tended to exhibit more deposition events compared with stream-type females. Over successive deposition events, the body condition of larvae deposited by stream-type females decreased faster than that of larvae deposited by pond-type females (Caspers et al. 2015).
3Sat Nano “Salamanderfrauen riechen Partner” 30.6.2009
Krause ET, Caspers BA (2016) Long-term consequences of early nutritional conditions on the behaviour and growth of fire salamanders Amphibia-Reptilia 37: 69-77
Caspers BA, Steinfartz S, Krause ET (2015) Larval deposition behaviour and maternal investment of females reflect differential habitat adaptation in a genetically diverging salamander population. Behavioral Ecology and Sociobiology 69:407-413 DOI10.1007/s00265-014-1853-1
Caspers BA, Krause ET, Hendrix R, Kopp M, Rupp O, Rosentreter K, Steinfartz S (2014) The more the better – polyandry and genetic similarity are positively linked to reproductive success in a natural population of terrestrial salamanders (Salamandra salamandra). Molecular Ecology 23:239-250
Krause ET, Caspers BA (2015) The influence of a water current on the larval deposition pattern of females of
a diverging fire salamander population (Salamandra salamandra). Salamandra 51(2):156–160
Ibanez A, Caspers BA, Lopez P, Martin J, Krause ET (2014) Is the reaction to chemical cues of predators affected by age or experience in fire salamanders (Salamandra salamandra)? Amphibia-Reptilia
Krause, E.T., v Engelhardt, N., Steinfartz, S., Trosien, R., & Caspers, B.A. (2013): Ultrasonography as a minimally invasive method to assess pregnancy in the fire salamanders (Salamandra salamandra). Salamandra 49:211-214
Caspers, B.A., & Steinfartz, S. (2011): Preference for the other sex: Olfactory sex recognition in terrestrial fire salamanders (Salamandra salamandra). Amphibia-Reptilia 32:503-508
Krause, E.T., Steinfartz, S., & Caspers, B.A. (2011): Poor-nutritional conditions during the early larval stage reduce risk taking activities of fire salamander larvae (Salamandra salamandra). Ethology 117:416-421
Caspers, B., Junge, C., Weitere, M., & Steinfartz, S. (2009): Habitat adaptation rather than genetic distance correlates with female preference in fire salamanders (Salamandra salamandra). Frontiers in Zoology 6:13