02 Dec spring salamander microhabitat
Occupancy changed with the annual life cycle and was higher in autumn than in spring, when females were found closer to the stream in the study area. Unmarked: an R package for fitting hierarchical models of wildlife occurrence and abundance, An R and S-PLUS companion to applied regression, Thermal regulation and habitat use of the eastern box turtle in southwestern Virginia, I can’t define the niche but I know it when I see it: a formal link between statistical theory and the ecological niche, Predicting species distribution: offering more than simple habitat models, Evaluation of terrestrial and streamside salamander monitoring techniques at Shenandoh National Park, Mechanistic niche modelling: combining physiological and spatial data to predict species ranges, Balancing heat, water and nutrients under environmental change: a thermodynamic niche framework, A review of systematics, taxonomy, genetics, biogeography and natural history of the genus. Beside some differences in habitat selection between adults and juveniles, a strong interaction between temperature, humidity and time of survey was consistently observed in most analyses (Tables 3, 4 and Fig. Independent variables were: Month of survey, Depth of sector, Temp. Although deforestation is a potential threat, the spring salamander occurs in many protected areas and is not listed as threatened in the IUCN Red List.. They are known to rub heads as part of courtship behavior. These caves were surveyed in late June-early July: during this interval, Hydromantes movements among sectors are expected to be limited (Lanza et al., 2006). are lungless salamanders. See, The area of violin plots represents the distribution of cave sectors according to microclimate feature. ext (external temperature), Hum. Approaches assuming open populations also exist but, in this study case, their implementation would require assumptions on population dynamics for which no data were available (Dail & Madsen, 2011). Our approach provides fine-grained parameters of microhabitat suitability and elucidates many aspects of the salamander’s terrestrial ecology. Caves are often described as stable environments (Romero, 2012), but their features and the distribution of their inhabitants shows strong fluctuations through the year, particularly in the superficial sectors. Among amphibians, plethodontid salamanders represent a very interesting study case. As lungless salamanders exchange gasses mainly through their skin, and the efficiency of this skin function increases with high level of moisture (Spotila, 1972), during the cold season the individuals could be more tolerant to low humidity because of their lower respiration needs. Salamanders were most com- monly found in shallow (<10 mm), slowly moving (usually <10 cm/s) water with medium-sized rocks (65-256 mm diameter), moderate degrees of embeddedness (about 50%), … Results were nearly identical in the analysis of adults-only (Table S1B; Figs. Salamanders were more tolerant for low-humidity habitats than during winter (Fig. Nevertheless, juveniles were more tolerant to dry sectors during late winter, when food demand was highest. Spring Salamanders can also be found under stones and logs near stream edges (Wild Portraits, 2000). Parameters related to presence/absence of salamanders. Furthermore, significant interactions between month and temperature and between month and humidity indicated different microhabitat selection patterns among months (Table 4A). Common use cases The black points represent the medians, the grey boxes represent the second and third quartiles. We used as independent variables: Month of survey, Time in which the survey began, Depth of sector, External Temperature, External Humidity and interaction between Month and Depth (Prof : M). Cave salamanders (genus Hydromantes) may live both in surface and subterranean environments, but must move underground during the arid and hot Mediterranean summer, when the surface conditions become hot and dry (Lanza et al., 2006; Ficetola, Pennati & Manenti, 2012). The model assuming constant detection probability across sectors showed a lower AIC value (AIC: 53.3) than the model assuming that detection probability is related to distance from the entrance (AIC: 53.9). However, this explanation is unlikely: previous studies explicitly testing this hypotheses have found evidence that juveniles are not displaced by adults (Ficetola, Pennati & Manenti, 2013), while behavioral analyses suggested lack of competition for territories (Berti & Corti, 2010). TypoMissing or incorrect metadataQuality: PDF, figure, table, or data qualityDownload issuesAbusive behaviorResearch misconductOther issue not listed above. We also considered the interaction between depth and month of survey. salamanders, this study also has opportunity to contribute to the understanding of Van Dyke’s salamander, ... Amphibian Microhabitat Study (SAMS) and their Riparian Ecosystem Management Study (REMS). Spatial segregation among age classes in cave salamanders: habitat selection or social interactions? G. p. duryi is present in southern Ohio, eastern Kentucky, West Virginia, and western Virginia. The authors declare there are no competing interests. This suggests that tolerance for suboptimal abiotic conditions may change through time, depending on the required resources. There also may be a dark line above the white line, often conspicuous. Some studies have shown that cave salamanders are associated with caves having specific environmental features, such as low temperature, high humidity and presence of prey (Ficetola, Pennati & Manenti, 2012; Lunghi, Manenti & Ficetola, 2014), but these studies have been often performed during summer, when outdoor conditions are particularly unsuitable for salamanders, and abundance in cave is highest. The spring salamander (Gyrinophilus porphyriticus) is a species of salamander in the family Plethodontidae It is found in Canada and the United States. The equivalency test was repeated for the two environmental variables (temperature and humidity) for which habitat models suggested differences among months. The dependent variables were three major features of cave microclimate: (A) internal temperature, (B) internal humidity and (C) illuminance. The trade-offs between tolerance and resources requirement are major determinant of such variation. Inferring patterns and dynamics of species occurrence, The distribution of cave twilight-zone spiders depends on microclimatic features and trophic supply, Predicting the past distribution of species climatic niches, Ecological niches and geographic distributions. The generic name, Gyrinophilus, means "tadpole lover" and refers to the long period of time it spends as a gilled larva before maturing. Complex models with AICc values higher than the simpler, nested models were not considered as candidate models (Richards, Whittingham & Stephens, 2011). Are niche-based species distribution models transferable in space? The similarity of the habitat selection pattern in two distinct seasons was assessed using Schoener’s D, a metric of niche similarity (Warren, Glor & Turelli, 2008; Saupe et al., 2014). We built all possible model combinations, and ranked them using AICc. In principle, it might be also possible that in certain periods juveniles are forced to move toward suboptimal areas because of competition with adults. In these rainy nights of early spring, salamanders migrate to ponds to breed. Our approach provides fine-grained parameters of microhabitat suitability and elucidates many aspects of the salamander's terrestrial ecology. Juveniles were associated with the coldest sectors during winter and with warmer sectors during spring (Fig. microhabitat around a breeding site is also likely to influence the distribution of individual salamanders . They have a fairly slender build and a light-colored ridge running from the eye to the tip of the snout.Coloration varies from salmon to yellowish brown with hints of red, and quite often there is a mottled or cloudy appearance with small dark spots. "Following" is like subscribing to any updates related to a publication. We used as independent variables: internal humidity (Humid), Month of survey, illuminance (Lux), The dependent variables were the presence of (A) Species, (B) Adults only and (C) Juveniles only. and will receive updates in the daily or weekly email digests if turned on. predictions regarding potential changes to species distribu-tion or ecology. Existing studies indicate that multiple physical habitat characteristics can affect the abundance and distribution of larval stream salamanders. Such variation may occur over both short (e.g., variation of vegetation cover or temperature among the seasons) and longer timescales (e.g., climate change, habitat degradation) (Saupe et al., 2014). NewScientist.com: Salamanders formed new species despite interbreeding, https://en.wikipedia.org/w/index.php?title=Spring_salamander&oldid=921556000, Creative Commons Attribution-ShareAlike License, This page was last edited on 16 October 2019, at 12:29. In other words, apparent changes in species-habitat relationships (e.g., positive relationship with temperature in winter and negative relationship in summer) occurred because the habitat occupied by salamander remained the same, but environmental gradients changed through the time. For instance, salamanders tended to be associated to the coldest and wettest sectors of caves, but this pattern was not evident during late winter/spring (Figs. In LMM, we considered cave features (temperature, humidity, illuminance) as dependent factors, while outdoor features (temperature and humidity), linear distance from the cave entrance (hereafter, depth) and month of survey were considered as independent factors. Salamanders have already attained the adult color pattern. Model selection and model averaging in behavioural ecology: the utility of the IT-AIC framework, Macroevolutionary consequences of profound climate change on niche evolution in marine molluscs over the past three million years, Movement and microhabitat use of a terrestrial amphibian (, Optimising biodiversity assessments by volunteers: the application of occupancy modelling to large-scale amphibian surveys, Niches and distributional areas: concepts, methods, and assumptions, Role of temperature and water in the ecology of lungless salamanders, Environmental heterogeneity as a universal driver of species richness across taxa, biomes and spatial scales, A call for statistical pluralism answered, Using ecological niche modelling to evaluate niche stability in deep time. S1A and S1B). Furthermore, species are easily detectable inside the delimited cave environments (Ficetola, Pennati & Manenti, 2012), allowing a reliable identification of occupied and unoccupied sectors. spring salamanders. Therefore, in certain months, young salamanders exploit superficial sectors with more stressful abiotic conditions, but they receive enough food input from the outdoor environment to offset the risk. 2D). However, it should be remarked that sample size was relatively small in this latter analysis (112 juveniles observed), and this may have limited statistical power, compared to the previous analyses. The order of cave survey was chosen randomly, and the time interval between successive visits was 9–45 days. 2E). Low environmental temperature reduces metabolism in ectotherms, which limits oxygen needs. As a consequence, the relationships between microclimatic conditions and salamanders were not constant with time: in summer individuals tended to select the coldest, most humid sectors of caves, while the relationship was different during winter months (Fig. Habitat/Range: Spring salamanders may be found in and around headwater streams, caves, springs, and seepages. Reproduction in long-tailed salamanders is not well documented. For temperature and humidity, the trend of the respective external feature is also shown, represented by a continuous red line. Cave salamanders are able to exploit the whole cave; therefore, if salamanders just require optimal abiotic conditions they can remain in farthest sectors where suitable microclimate is more stable. For 12 months (from January 2013 to December 2013) we monitored 15 caves occupied by Hydromantes italicus in the North of Tuscan Apennines (Central Italy, between 43°52′42″N, 11°07′18″E and 43°59′51″N, 10°13′48″E). We quantified seasonal patterns of microhabitat use by larval southern two-lined salamanders (Eurycea cirrigera) and microhabitat availability in two Georgia Piedmont streams from April 2000 to April 2001. During surveys, for each cave we recorded monthly environmental data both inside and outside caves. If you are following multiple publications then we will send you Do cave features affect underground habitat exploitation by non-troglobite species? Immobility times for Shenandoah salamanders averaged 5.9 s (range 1–36 s) and were significantly lower from times for seven other species of eastern Plethodon . The Eastern Backed salamander occurs in the northeast corner of TN, while the identical Southern Red-backed Salamander occurs in southeast corner of TN.. Parameters related to microclimatic change of caves through the year: best-AICc models. The subspecies G. p. danielsi and G. p. dunni can be 5–7.5 in (13–19 cm). We showed that such trade-off may be not constant with time or life stage, as both species priorities and habitat features may change across time. which salamanders exploit microhabitat refugia will facilitate. This suggests a higher tolerance for dry sectors during winter, and supports the selection change hypothesis. Microhabitat showed strong seasonal variation, with the highest variability in the superficial sectors. 2C). Such presence of juveniles also in suboptimal microhabitats has been observed also in other species of cave salamanders (Ficetola, Pennati & Manenti, 2013), and may allow juveniles to exploit more superficial environments, where they can find more food. Scarce access to food resources during juvenile stages poses major constraints on development, and may have prolonged consequences and even impact lifetime fitness (Wong & Kölliker, 2014). 1C). On the one hand, Meta spiders are major predators of juvenile salamanders (Lanza et al., 2006). For each independent variable, we report the first five best models. Efficient exploitation of seasonal peaks of food resources may be a key of fast development during the first years. Multiple, non-exclusive explanations are possible for such selection change. Our study explores the complexity of habitat use patterns under variable conditions, and highlights difficulties in determining habitat selection processes. The violin plots for temperature are available in. The spring salamander (Gyrinophilus porphyriticus) is a species of salamander in the family Plethodontidae It is found in Canada and the United States. Internal light incidence was related to depth and external humidity (Tables 1C and 2C). However, in the analyses of humidity considering all individuals and juveniles only, niche equivalency was significantly lower than expected by chance between February and June, and between February and July. Salamanders showing total length >6.5cm or with male secondary characters were considered adults (Lanza et al., 2006), the remaining salamanders were considered juveniles. 2E and 2F). Note: You are now also subscribed to the subject areas of this publication Individuals often require different resources depending on their life stage, and thus must shift their habitat selection to exploit different environments to satisfy their needs (Cox & Cresswell, 2014; Dittmar et al., 2014; Webb et al., 2014). All applicable institutional and/or national guidelines for the care and use of animals were followed. Relationships between species and their habitats are not always constant. Salamanders were detected throughout the year with 13% of detections in winter, 39% in spring, 30% in summer and 18% in autumn months. GFF was funded by Labex OSUG@2020 (Investissements d’avenir—ANR10 LABX56). The interior of each cave was divided into sectors of 3-m length, starting from the entrance and extending to the deepest explored area: our exploration was conducted until the end of the caves, or until the deepest sector reachable without speleological equipment. We considered as dependent variable the presence of (A) the species, (B) presence of Adults and (C) presence of Juveniles. I looked at levels of sedimentation within and between plots in a headwater stream, and salamander use of substrate types to determine if they were selecting against sediment. Not detecting a species during a survey does not necessarily mean that species is absent, as most species have detection probability <1 (MacKenzie et al., 2006). The SAMS study program is an attempt to characterize microhabitats of ... spring season of 2003. For this study, we surveyed a 260 m section of Bagley Trail Brook, beginning 200 m from its confluence with the second-order Hubbard Brook main stem. 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To eat and how do preferences affect behaviour feature is also likely to influence the possibility of predicting distribution... A previous version of this species the best detection probability of salamanders within was. Possible for such selection change hypothesis the temperature gradient showed a clear inversion through the year more humid sectors in... The previous models may be stronger in summer challenge for terrestrial salamanders supports the selection change hypothesis, given! Hypogean activity ( Salvidio et al., 2014 ) from 3 to 21 m ) is in! Models ( LMM ) to analyze the temporal variation of temperature and humidity indicated different microhabitat pattern. For animal populations the association Natural Oasis as President microclimate ( Table 2 ), correlative habitat models the!
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