Age, Growth and Longevity of Sympatric Triturus cristatus, T. marmoratus and Their Hybrids (Amphibia, Urodela): A Skeletochronological Comparison

Francillon‐Vieillot, H.; Arntzen, J. W.; Géraudie, Jacqueline

doi:10.2307/1564284

Cited by 104 publications

(91 citation statements)

References 9 publications

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“…In our study, there was a trend towards positive correlation between SVL and age, though it was statistically significant only in males. Maximal life span in our sample was the same, while the age of sexual maturation was somewhat higher, compared to those recorded for T. cristatus in France (Francillon-Vieillot et al, 1990). Also, the life span data for our sample correspond to those obtained for T. carnifex from ¿umberak (Kletecki, 1990).…”

Section: Discussionsupporting

confidence: 80%

“…Bell, 1977) has received much criticism. Many previous studies found great variability of SVL within one age class (Hagstrom, 1980;Caetano et al, 1985;Verrell & Francillon, 1986;Francillon-Vieillot et al, 1990;Kalezic et al, in press). In our study, there was a trend towards positive correlation between SVL and age, though it was statistically significant only in males.…”

Section: Discussionmentioning

confidence: 88%

“…Age at onset of sexual maturity was estimated from the «rapprochement» pattern of LAG, due to slowing of growth related to sexual maturation (Kleinenberg & Smirina, 1969; for a discussion on the critical application of this method, see Francillon-Vieillot et al, 1990). In a few individuals with regular pattern of bone growth, rapprochement was not visible, and the timing of sexual maturation could not be determined.…”

Section: Age Determinationmentioning

confidence: 99%

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The crested newt (Triturus carnifex) in the Submediterranean: Reproductive biology, body size, and age

Cvetković¹,

Kalezić²,

Djorović³

et al. 1996

Italian Journal of Zoology

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The annual reproductive cycle of both sexes of Triturus carnifex from the Submediterranean was analysed, as well as complex relationships between fecundity, body size, and age. Highly significant seasonal variations in snout-vent length-adjusted gonads, fat bodies, and liver weight were found in both sexes. Variations in cycle due to geographic location and climate were recorded. Newts exhibited extended residence in water and lengthening of breeding period. Body size was significantly correlated with age in males, contrary to females. All organ weights were significantly correlated to body size, except for fat body weight in females. In both sexes, fecundity parameters showed a highly significant effect of season, while the effect of age was insignificant (testes weight and total number of oocytes) or barely significant (ovaries weight).

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Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 88%

Section: Age Determinationmentioning

confidence: 99%

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The crested newt (Triturus carnifex) in the Submediterranean: Reproductive biology, body size, and age

Cvetković¹,

Kalezić²,

Djorović³

et al. 1996

Italian Journal of Zoology

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“…represent age and that show a tightening ("rapprochement") at age 5, indicating the switch in resource allocation from growth to reproduction (see also [64]). …”

Section: Conflicts Of Interestmentioning

confidence: 99%

Drastic Population Size Change in Two Populations of the Golden-Striped Salamander over a Forty-Year Period—Are Eucalypt Plantations to Blame?

Arntzen

2015

Diversity

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Over the last half century the Iberian peninsula has seen the large scale planting of exotic gum trees (Eucalyptus sp.) therewith reducing space for native wildlife. An additional effect of the gum tree plantations may be the lowering of the water table in adjacent streams, to which amphibian species with a larval niche in the running sections of small streams would be especially susceptible. In northwestern Iberia that niche is occupied by the Golden-striped salamander, Chioglossa lusitanica. I here report on the demographic trends of two C. lusitanica populations over a forty-year period, in two areas of one mountain range near Porto in northwestern Portugal. In both areas advantage was taken of the migration pattern of C. lusitanica to sites for aestivation and breeding in summer and fall. The area of the Silveirinhos brook was transformed in a plantation of gum trees shortly after the research started, while the area of Poço do Inferno remained virtually unaffected. At Silveirinhos the adult C. lusitanica population declined by one or two orders of magnitude, from ca. 1500 individuals to less than 50 at present. Demographic models that operate under a uniform larval mortality yielded population sizes that are compatible with field observations, including the late onset of the decline at 14 or more years after the planting of the gum trees and the near-extinction at year 32. An alternative reason for the relatively recent population collapse of C. lusitanica may have been disease, but no sick individuals or corpses have become available for clinical investigation. Conversely, the control population at Poço do Inferno increased in size by a factor of five or more. These data support the hypothesis that gum tree plantations have a strong negative effect on C. lusitanica. The population size increase at Poço do Inferno is probably attributable to the installation of wastewater treatment in the adjacent town of Valongo, with a discharge in the Simão river and closely connected to Poço do Inferno. This result suggests that the Simão river OPEN ACCESSDiversity 2015, 7 271 contributes to the Poço do Inferno population and that medium-large streams may constitute prime C. lusitanica habitat. Larval mortalities estimated for stable and declining populations are remarkable close (0.69 and 0.73, respectively), but dissimilar to the larval mortality at ca. 0.51 of an increasing population such as at Poço do Inferno. Suggestions for further research include (i) the continued monitoring of the Silveirinhos population with inspections at 5-10 year intervals, and (ii) checking for the persistence of C. lusitanica populations in and around gum tree plantations where the species was reported decades ago.

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“…Lines of arrested growth (LAGs) are formed annually in the bone at periods of growth retardation such as hibernation. Thus, LAGs provide valuable information not only on the organism's age (the number of winter seasons a given individual has experienced), but also on the process of bone growth with age (Hemelaar, 1988;Fretey and Le Garff, 1992;Neveu,1992) and sexual maturation (Francillon-Vieillot et al, 1990;Augert, 1992;Augert and Joly, 1993;Caetano and Castanet, 1993;Kusano et al, 1991Kusano et al, , 1995a.…”

Section: Introductionmentioning

confidence: 99%

Validity of Back-calculation Methods of Body Size from Phalangeal Bones. An Assesment Using Data for Rana japonica.

2000

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Lines of arrested growth (LAGs) appearing in bone sections are useful for age estimation. They also indicate the past growth process in amphibians in temperate zones. Several back-calculation formulae (BCFs) use LAGs to estimate an individual's body size at an earlier time based on the current body size. In order to evaluate the validity of these BCFs, we conducted a mark-recapture and skeletochronological study of female Rana japonica in Higashi-Hiroshima, Japan, from 1995 to 1999. The body sizes of 31 recaptured frogs were back-calculated using eight different BCFs and were compared with the frogs' actual body sizes as measured at the previous capture. The most accurate estimation was made by the simplest BCF (Dahl-Lea method) without any regressions between body size and bone diameter; that is, Li=Lc(Di/Dc) (L: snout-vent length, D: bone diameter, c: at the time of capture [recapture], i: at the i-th winter).

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Age, Growth and Longevity of Sympatric Triturus cristatus, T. marmoratus and Their Hybrids (Amphibia, Urodela): A Skeletochronological Comparison

Cited by 104 publications

References 9 publications

The crested newt (Triturus carnifex) in the Submediterranean: Reproductive biology, body size, and age

The crested newt (Triturus carnifex) in the Submediterranean: Reproductive biology, body size, and age

Drastic Population Size Change in Two Populations of the Golden-Striped Salamander over a Forty-Year Period—Are Eucalypt Plantations to Blame?

Validity of Back-calculation Methods of Body Size from Phalangeal Bones. An Assesment Using Data for Rana japonica.

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