The distribution is not continuous in any of these regions, but there are zones of suitable habitat. Licht. The 33 recently confirmed sites gave an IAO of 196 km². Reproduction. Brandon, R.A. 1961. In both laboratory predation experiments and field observations (Rowe et al. Dunson. 196 km² based on 300-m buffer for 33 locations with recently confirmed presence of Jefferson Salamander and unisexuals. 2008. Based on studies in Maryland (Thompson et al. When molecules and morphology clash: a phylogenetic analysis of North American ambystomatid salamanders (Caudata: Ambystomatidae). His research examines evolution at the species level and involves molecular biology, cytogenetics, ecology and evolution with a focus on polyploid amphibians. gonochoric/gonochoristic/dioecious (sexes separate), Reptiles and Amphibians in the Eastern/Central North America, Amphibians and Reptiles of the Great Lakes Region, http://www.cciw.ca/ecowatch/dapcan/tour/glossary/bss/bss2.htm, www.pangea.ca/nnz/spring/creature/bluespot/Fblspot.html, © 2020 Regents of the University of Michigan. Clanton (1934) hypothesized that spermatophores could be limiting in unisexual dominated populations and that female A. jeffersonianum might lose out to unisexual females, which would continually reduce the population of A. jeffersonianum until there was no longer any recruitment. Documented locations of Ambystoma jeffersonianum in Ontario (Jefferson Salamander Recovery Team 2010). The conservation status of unisexual vertebrate populations. 1991. © Her Majesty the Queen in Right of Canada, 2011. Clutches can contain between 5 and 60 eggs, averaging about 30. Where mortality = annual rate of mortality of adults. Copeia 1961: 377-383. Species discrimination by chemical cues in a unisexual-bisexual complex of salamanders. The costal grooves are distinct and the teeth are bicuspid with the premaxillary and maxillary teeth forming a single row (Uzzell 1967). The hybrid between blue-spotted salamander and Jefferson salamander is called A. platineum. August 2010). These losses are reflected in reduced population sizes and disappearances of entire populations at some historical sites (see section on Fluctuations and Trends). Toxicity of metals and low pH to embryos and larvae of the Jefferson salamander, Ambystoma jeffersonianum. Roads also increase the vulnerability of migrating adults to predators. Over the range of unisexuals, A. jeffersonianum is the most commonly used male sperm donor (Bogart and Klemens 2008). Salamanders of the United States and Canada. Wake. This new information clarifies further the relationship between Jefferson Salamander (JJ) and sympatric populations of all female unisexual Ambystoma (LJJ) salamanders. The temporal data relate to the first time that the population was discovered (First Year), and the subsequent years that the population was still found to contain A. jeffersonianum and/or unisexual individuals. These larger recent samples show that most or all salamanders in all populations are LJJ. at www.pangea.ca/nnz/spring/creature/bluespot/Fblspot.html. AmphibiaWeb. Most Ambystoma jeffersonianum and unisexual salamanders examined from the United States are deposited in the American Museum of Natural History (AMNH). Catalogue No. 1968. Ballou and R. Frankam. Ontario Ministry of Natural Resources. Terrestrial habitat is in mature woodlands that have small mammal burrows or rock fissures that enable adults to over-winter underground below the frost line. 7, No. ABSTRACT An Ecological Study of the Spotted Salamander, Ambystoma maculatum, and Jefferson Salamander, A. jeffersonianum, in West Virginia by Seth Myers The movements of Spotted Salamanders, Ambystoma maculatum, and Jefferson Salamanders, A. jeffersonianum, in and out of an ephemeral wetland in West Virginia were monitored for one breeding season using a drift fence lined with Unisexual Ambystoma are known to steal sperm from males of five different ambystomatid species (A. barbouri, A. jeffersonianum, A. laterale, A. texanum, A. tigrinum) in eastern North America (Bogart et al. Egg masses are surveyed during the day from mid-April to mid-May and larval surveys from mid-May through July. They are found around the Great Lakes and west as far as central Manitoba. The Clanton effect has not been documented in any population. 1967. 2007; and unpublished). Étude démographique d’une population de salamandres (Ambystoma maculatum) à l’aide de la méthode squeletto-chronologique. Evolution, 46(6): 1935-1943. Generation Time = Age at maturity + 1/mortality. Clearing fallen trees or debris from summer habitat and from the edges of breeding ponds limits the food, protective cover, and dispersal abilities for A. jeffersonianum. Mature females are slightly longer than mature males. Whiskers (error bars) above and below the box indicate the 90th and 10th percentiles. Predation on larval and embryonic amphibians by acid-tolerant caddisfly larvae (Ptilostomis postica). Bishop, S.C. 1941. Sever (ed), Reproductive Biology and Phylogeney of Urodela (Amphibia). There are some localities outside the documented range of A. jeffersonianum from which LJJ or LJJJ unisexual Ambystomahave been positively identified. The second IAO calculation used 43 recently and historically confirmed sites and gave an IAO of 256 km². Blue-spotted complex salamander. Exclusion of the Jefferson Salamander, Ambystoma jeffersonianum, from some potential breeding ponds in Pennsylvannia: effects of pH, temperature, and metals on embryonic development. Box plot graphs to compare snout-vent lengths (SVL) of Ambystoma jeffersonianum males (n = 128) and females (n = 40) found during a survey at Location A in Ontario. This sometimes makes identificatio… Nyman, S., M.J. Ryan and J.D. They are often deemed to be hybrids and as such would not be considered for protection, but the unisexuals are not hybrids in the sense of first generation crossing of two species (like a mule). Anderson. Most migration events to or from breeding ponds coincide with rain. Most of the information on the terrestrial ecology has been derived from experiments that have employed radio transmitters (Faccio 2003, Bériault 2005, OMNR, unpublished data). From repeated surveys within about a 15-year time frame (1990,91-2004,5), no population was estimated to be larger than the initial survey in subsequent surveys. If male A. jeffersonianum are extirpated, the unisexual population crashes unless they can use another species as a sperm donor. Bogart, J.P. 1982. Size in relation to sex, hybridity, ploidy, and breeding dynamics in central Ontario populations of the Ambystoma laterale-jeffersonianum complex. obs.). 1998. breeding is confined to a particular season, reproduction that includes combining the genetic contribution of two individuals, a male and a female. Salamanders respond selectively to contacts with snakes: survival advantages of alternative antipredator strategies. If this isn’t complicated enough, it gets worse. and W.A. Salamanders of the Ambystoma jeffersonianum complex in Indiana. These data are, however, somewhat misleading because the relatively few isozyme loci (eight to ten) that were chosen to identify A. jeffersonianum are conservative, or slowly evolving loci (Shaffer et al. It is a unisexual clonal triploid. All populations where A. jeffersonianum (JJ) have been found also contain unisexual Ambystoma (LJJ). If the male’s genome is incorporated, it can replace an existing unisexual genome through genome replacement (Bi et al. Unisexuals must be able to switch sperm donors and this switch has been documented in one Ontario population (Location G) (Bogart et al. The numbers diminished over the three years of his study from 624 in 1975 to 513 in 1976 to 324 in 1977. The Location C population in Norfolk County also appears to be persistent. Phylogenetically, A. jeffersonianum shares its most recent common ancestor with either A. macrodactylum (Shaffer et al. Ambystoma jeffersonianum is apparently secure in several populations in Pennsylvania where it does not live with unisexual Ambystoma (Bogart and Klemens 1997), and has large population densities (M.W. Is rescue from outside populations likely? A few new populations of A. jeffersonianum have been found on the Oak Ridges Moraine in York Region, in Waterloo Region, and in Hamilton-Wentworth Region (Figure 3). You will not receive a reply. The sperm may or may not be incorporated into the egg. 1992, Bogart 2003, Bogart et al. In a study that examined 1377 individuals from 118 sites, only one LLJJ individual was found by Bogart and Klemens (2008). Herpetologica 26: 413-422. 1988). A. jeffersonianum is one of the earliest breeders and migrates to vernal pools in late winter/early spring while the pools are still thawing to begin its breeding process. Toxicity of road salt to Nova Scotia amphibians. NHIC (Natural Heritage Information Centre). There are now fewer than 30 extant populations (defined here as equivalent to number of known, extant breeding ponds or locations) that still maintain A. jeffersonianum. Recovery Strategy for the Jefferson Salamander (Ambystoma jeffersonianum) in Ontario. This mode of reproduction is called gynogenesis.The females lay cylindrical egg masses and attach them to underwater twigs. Now only a small piece of tissue is required to distinguish between JJ and LJJ and other polyploids, which allows much larger sample sizes to be evaluated. Recent surveys show that very low numbers of pure Jefferson Salamanders actually exist in populations, even those that have a high density of salamanders. 2007). Jefferson salamander is a species of salamander found in United States and Canada. 2009) that unisexual Ambystoma may incorporate nuclear genomes of at least five distinct species of Ambystoma and can be diploid, triploid, tetraploid and even pentaploid (Bogart 2003). Archives of Environmental Contamination and Toxicology 27:232-238. Herpetologica 46: 371-382. Biological Conservation 139: 159-166. Nearly all of them in our region look more like Jefferson’s than Blue-Spotteds, and since we can’t tell without checking the DNA, we consider them Jefferson’s Complex. Size data, measured from the snout to the vent (. Three generations is approximately 33 years. The salamander's tail is broadly oval at the base and compressed towards the tip. So, what do we call those speckled salamanders that don’t have yellow spots? Eggs may also die if early spring temperatures drop and the egg masses freeze or if the water level falls and the eggs desiccate. A comparative study of topographical orientation in Ambystoma (Amphibia: Caudata). Copeia 1961: 495-496. ... Reproduction. Raymond, L.R. 3rd edition, expanded. In Ontario, there are populations of unisexuals that are in the process of switching sperm donors from A. jeffersonianum to A. laterale, and historical records reveal that this transition can happen very rapidly. Dunson. Recent genetic analysis of specimens from around Sarnia and close to Ipperwash found them all to be A. laterale and LLJ unisexuals (J. P. Bogart pers. Probability of extinction in the wild is at least [20% within 20 years or 5 generations, or 10% within 100 years]. Faccio, S.D. Sandinski, W.J. Documented locations of Ambystoma jeffersonianum in Ontario, Figure 4. Thesis. Behavioral and physiological responses of the terrestrial life stages of the Jefferson salamander, Ambystoma jeffersonianum, to low soil pH. Minton (1954) clearly defined A. laterale and A. jeffersonianum in Indiana and posited that Clanton’s “light” form was a hybrid of these two species. (doi:10.1186/1471-2148-8-158.). These glands produce a milky noxious liquid that is secreted when it is threatened. Little is known about either the age of first reproduction or the frequency of reproduction for either sex. Size data are available only for Location A and Location B (Table 1), The salamanders tend to be smaller at Location A, and perhaps this reflects more recent or more consistent recruitment over time and that larger individuals are, on average, older. Is there an [observed, inferred, or projected] continuing decline in [area, extent and/or quality] of habitat? Unisexual Ambystoma are considered to have arisen at one time (about 5 million years ago) and share a maternal ancestor with a Kentucky population of Streamside Salamanders, A. barbouri (Bogart 2003, Bogart et al. Karine Bériault, Species at Risk Biologist, Ministry of Natural resources, Vineland Area Office. Breeding ponds are devoid of predatory fish, often ephemeral, and are filled by spring runoff, groundwater, or springs. Observation et analyse de la prédation des oeufs d’Ambystoma maculatum (Shaw) (Amphibia, Urodela) par des larves de Diptères chironomidés, dans la région de Trois-Rivières (Québec). S1 = critically imperiled, S2 = imperiled, S3 = vulnerable. Ottawa. 69pp. Jefferson salamander ... Reproduction. Spolski, C., C.A. It is also interesting to realize that unisexuals can only successfully immigrate to ponds that already have acceptable sperm donors. Suitable or historical habitat for A. jeffersonianum may be impacted (e.g., a pond may be stocked with fish) (L. Rye, W.J. BMC Evolutionary Biology 8: 158. Waving the tail and oozing poison are typical responses to a predator (Ducey and Brodie 1983, Brodie 1989). Systematic Biology 54: 91-110. Larvae are also eaten by conspecifics and larvae of other ambystomatids. Assuming that all 33 recently confirmed populations of Jefferson Salamanders are still extant, and also assuming that all LJJ unisexuals must live with Jefferson Salamanders, the value of the EO used in this report is 6 913 km². The primary focus of genetic studies of A. jeffersonianum has been to distinguish individuals of that species from sympatric unisexual individuals. Journal of Herpetology 14: 113-120. Males, in breeding condition, have a distinctly swollen cloacal region. Once in the ponds, males will court females, then deposit spermatophores on the bottom of the pond. Note the swollen cloacal region in the male. Courtship and egg deposition may occur under the ice of vernal pools and individual males court several females. 1992. These salamanders can live for ~ 25 yrs, so unisexuals could continue to come to breeding ponds for several years even if A. jeffersonianum males did not. 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