Age Structure and Life Expectancy in a Stellagama stellio (Linnaeus, 1758) Population from Kütahya, Turkey

2021 ◽  
Vol 28 (6) ◽  
pp. 327-332
Author(s):  
Muge Gidis ◽  
Eyup Baskale
Keyword(s):  
Life History ◽  
Standard Deviation ◽  
Sexual Dimorphism ◽  
Life Expectancy ◽  
Age Structure ◽  
Life History Traits ◽  
Age At Maturity ◽  
Males And Females ◽  
The Mean ◽  
The Difference

The life history traits of the rough-tailed agama, Stellagama stellio (Linnaeus, 1758) in a population from Kütahya, Turkey were described by the skeletochronological method. From a total of 54 individuals, the mean ages ± standard deviation (SD) of males and females were calculated as 5.03 ± 2.076 years and 4.79 ± 1.584 years, respectively, and age distributions were not significantly different between sexes. The age at maturity was 2 years for both sexes. The longevity of females was 8 years, whereas for males it was 9 years. Mean snout-vent length (SVL) ± SD was 101.7 ± 9.6 mm in females and 104.9 ± 14.4 mm in males and did not significantly differ between the two sexes. We examined the sexual dimorphism of S. stellio in relation to the difference in population age structure between the sexes using the skeletochronological method. Male individuals were slightly larger than female individuals at the same age, but this difference was not statistically significant. We also estimated the maximum ages for S. stellio, which agree with other populations in Turkey.

Life History Traits in a Population of Pelobates syriacus (Boettger, 1889) from Turkey

2020 ◽  
Vol 27 (4) ◽  
pp. 195-200
Author(s):  
Ufuk Bülbül ◽  
Halime Koç ◽  
Yasemin Odabaş ◽  
Ali İhsan Eroğlu ◽  
Muammer Kurnaz ◽  
...  
Keyword(s):  
Life History ◽  
Age Structure ◽  
Life History Traits ◽  
Spadefoot Toad ◽  
Males And Females

Age structure of the eastern spadefoot toad, Pelobates syriacus from the Kızılırmak Delta (Turkey) were assessed using phalangeal skeletochronology. Snout-vent length (SVL) ranged from 42.05 to 86.63 mm in males and 34.03 to 53.27 mm in females. Age of adults ranged from 2 to 8 years in males and 3 to 5 years in females. For both sexes, SVL was significantly correlated with age. Males and females of the toads reached maturity at 2 years of age.

Seasonal distribution, abundance, and life-history traits of Greenland cod, Gadus ogac, at Wemindji, eastern James Bay

1991 ◽  
Vol 69 (12) ◽  
pp. 3061-3070 ◽  
Author(s):  
Bernard Morin ◽  
Christiane Hudon ◽  
Frederick Whoriskey
Keyword(s):  
Life History ◽  
Coastal Waters ◽  
Life History Traits ◽  
Age At Maturity ◽  
James Bay ◽  
High Fecundity ◽  
Benthic Fishes ◽  
Males And Females ◽  
Trap Catches ◽  
Growth And Reproduction

Greenland cod populations near Wemindji, eastern James Bay, were studied in 1987 and 1988 to describe the species' general ecology and life-history characteristics. During the summer, they principally occupied shallow (2–5 m) coastal waters. This habitat was characterized by a belt of eelgrass (Zostera marina) at depths of 1–3 m, salinities between 20 and 23‰, and temperatures of 3–20 °C. Daily trap catches were highly variable, and more fish were caught at night than during the day. In winter, more cod were found inshore, in the estuary, than in coastal waters. This movement corresponds to the completion of sexual maturity; spawning occurs in April to June. Growth rate was linear for males and females. The age at maturity was 3 years and no trade-off was observed between growth and reproduction. Greenland cod spawned every year, and the maximum age was 9 years. Life-history variables for Greenland cod differ from those of most arctic benthic fishes; this species shows rapid growth, high fecundity, low age at maturity, and high mortality. These characteristics may represent important adaptations allowing cod to sustain life in James Bay coastal waters, where environmental conditions are different from those in arctic waters.

A skeletochronological study of age, growth and longevity of Rana macrocnemis populations from four locations at different altitudes in Turkey

2011 ◽  
Vol 32 (1) ◽  
pp. 113-118 ◽  
Author(s):  
Emel Çakır ◽  
Ufuk Bülbül ◽  
Nurhayat Özdemir ◽  
Bilal Kutrup
Keyword(s):  
Life History ◽  
Age Structure ◽  
Sexual Maturity ◽  
Life History Traits ◽  
Maximum Lifespan ◽  
Population Age Structure ◽  
Positive Correlation ◽  
Males And Females ◽  
Different Altitudes ◽  
Rana Macrocnemis

AbstractWe examined life-history traits such as population age structure, growth and longevity of Iranian Long-Legged frogs (Rana macrocnemis) from 4 different locations at different altitudes in Turkey by skeletochronology performed on the phalanges. The maximum lifespan was 5 years in Maçka (350 m a.s.l.), 6 years in Hıdırnebi (1430 m a.s.l.), 8 years in Sarıkamış (2276 m a.s.l.) and 10 years in Ovit (2850 m a.s.l.). Age at sexual maturity of both males and females was 2-3 years in the Maçka, Hıdırnebi and Sarıkamış populations, while 3-4 years for males and 3-5 years for females in the Ovit population. In all populations, males and females did not exhibit any differences in terms of mean age and SVL except for Sarıkamı¸s where the males were significantly larger than the females. A positive correlation was observed between age and SVL for both sexes in all populations except for the males of the Maçka population.

scholarly journals Age structure and body size of the endangered species Darevskia bendimahiensis (Schmidtler, Eiselt & Darevsky, 1994) from eastern Turkey (Squamata, Sauria, Lacertidae)

Herpetozoa ◽  
2019 ◽  
Vol 32 ◽  
pp. 159-163
Author(s):  
Elif Yıldırım ◽  
Yusuf Kumlutaş ◽  
Kamil Candan ◽  
Çetin Ilgaz
Keyword(s):  
Life History ◽  
Body Size ◽  
Endangered Species ◽  
Age Structure ◽  
Sexual Maturity ◽  
Life History Traits ◽  
Eastern Turkey ◽  
The Future ◽  
The Mean ◽  
Spearman’S Correlation

The life-history traits of the parthenogenetic lizard Darevskiabendimahiensis were studied by skeletochronology in a population inhabiting highlands in Çaldıran, Van, Turkey. Endosteal resorption was observed in 18 specimens (55%). The mean age was 4.91 ± 0.19 SD years. The mean snout-vent length (SVL) was 51.11 ± 1.15 SD mm. The age at sexual maturity was estimated as 3 years. Longevity was 7 years. Snout-vent length and age were positively correlated (Spearman’s correlation; r = 0.797, P = 0.000). The aim of this study is to contribute to the future conservation activities for this endangered species.

Sexual dimorphism and age structure of the Montseny newt (Calotriton arnoldi)

2015 ◽  
Vol 36 (3) ◽  
pp. 245-252 ◽  
Author(s):  
Fèlix Amat ◽  
Neus Oromí ◽  
Delfí Sanuy ◽  
Salvador Carranza
Keyword(s):  
Life History ◽  
Sexual Dimorphism ◽  
Age Structure ◽  
Sexual Maturity ◽  
Life History Traits ◽  
Geographic Scale ◽  
Total Body ◽  
Similar Body ◽  
Two Populations ◽  
Small Geographic Scale

Patterns of sexual dimorphism and age structure were investigated in two populations of the newtCalotriton arnoldi, endemic of the Montseny Massif (NE of the Iberian Peninsula). In contrast to the Pyrenean newt (Calotriton asper) sexual dimorphism in the Montseny brook newt is characterized by slightly larger females (60.3 ± 0.3 mm; maximum: 68 mm) than males (59.5 ± 0.2 mm; maximum: 64 mm) and more similar body shape between sexes. Both populations and sexes mature at the same age (3 years), show the same age structure and achieve similar longevity (8-9 years). Comparing our results with the framework of the variation of life-history traits inCalotriton, the Montseny newts exhibit fast sexual maturity and short longevity. Curiously, we have found a lack of covariation between age at sexual maturity, longevity and total body size in the populations ofCalotritonspecies. Only in males, age at sexual maturity seems to be affected by altitude, but in an unexpected way: sexual maturation is delayed in populations at low altitudes. Moreover, the age at sexual maturity does not differs between the populations where immatures are terrestrial vs. those where they remain aquatic. Our results suggest that life-history traits inCalotritonnewts could be determined by selective factors that play their role at small geographic scale.

scholarly journals Density-Dependent Phenotypic Plasticity in the South American Locust, Schistocerca cancellata (Orthoptera: Acrididae)

2019 ◽  
Vol 112 (5) ◽  
pp. 458-472 ◽  
Author(s):  
Martina E Pocco ◽  
M Marta Cigliano ◽  
Bert Foquet ◽  
Carlos E Lange ◽  
Eliana L Nieves ◽  
...  
Keyword(s):  
Life History ◽  
Phenotypic Plasticity ◽  
Life History Traits ◽  
South American ◽  
The South ◽  
Density Dependent ◽  
Strong Resemblance ◽  
Males And Females ◽  
The Mean ◽  
Phase Polyphenism

Abstract Historically, the South American locust, Schistocerca cancellata (Serville, 1838), has been considered the most serious agricultural pest in Argentina. An outbreak of a magnitude not recorded since 1954 started in 2015 through 2017 in northern Argentina and neighboring Paraguay and Bolivia. Schistocerca cancellata is widely considered as a true locust, with pronounced locust phase polyphenism, although the expression of its phenotypic plasticity has never been quantitatively tested under different density conditions. In this study, we explicitly quantified density-dependent reaction norms in behavior, coloration, and morphology in last instar nymphs of S. cancellata under isolated and crowded conditions. We also quantified density-dependent plasticity in adults (size) and in some life history traits. Our results showed that crowded nymphs were significantly more active and more attracted to congeners than isolated nymphs, and developed a much higher percentage of black pattern color. We also found that density had strong effects on body size and there was a sex-dependent pattern in both nymphs and adults, revealing that differences in size between males and females were less pronounced in crowded locusts. We have recorded for the isolated nymphs the presence of about 50% more hairs in the hind femora than in crowded nymphs. Finally, the mean duration of each nymphal instar and adult stage was significantly longer in isolated individuals. We have found strong resemblance with the desert locust, S. gregaria (Forskål, 1775) in several traits, and we conclude that S. cancellata exhibits an extreme form of density-dependent phenotypic plasticity in behavior, coloration, morphology, and life history traits.

scholarly journals Demographic Traits Variation in a Pyrenean Newt (Calotriton asper) among Lacustrine and Stream Populations

Diversity ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 471
Author(s):  
Sebastià Camarasa ◽  
Neus Oromi ◽  
Delfí Sanuy ◽  
Fèlix Amat
Keyword(s):  
Life History ◽  
Body Size ◽  
Age Structure ◽  
Sexual Maturity ◽  
Life History Traits ◽  
Size Structure ◽  
Maximum Size ◽  
Sexually Dimorphic ◽  
Age At Maturity ◽  
Demographic Traits

Demographic traits were analyzed in the Pyrenean brook newt (Calotriton asper) to evaluate whether its variability responds to the adaptation to the different habitats. In this study, life history traits of Calotriton asper were studied in nine populations living in two different kinds of habitats in the Pyrenees mountains: lakes and streams. Skeletochronology was used to determine age structure and different traits such as age at maturity and longevity. Age structure was different between populations and sexes. The two lacustrine populations, with facultative pedomorphosis, attained their maturity earlier. Age at sexual maturity ranged from 4 to 9 years and in some populations was similar between sexes while in others, females matured at younger ages than males. Maximum longevity varied from 7 to 35 years among populations and was correlated with the age at sexual maturity. Body size differed among populations, was sexually dimorphic, and this disparity was not related to the kind of habitat. The maximum size was found in the lacustrine population but exhibited high variation between populations. The results obtained show a significant variability between sexes and populations, in age and body size structure of Calotriton asper that did not depend on the habitat.

scholarly journals Consequences of combining life-history traits with sex-specific differences

2020 ◽  
Author(s):  
Vandana Revathi Venkateswaran ◽  
Olivia Roth ◽  
Chaitanya S. Gokhale
Keyword(s):  
Life History ◽  
Sexual Dimorphism ◽  
Reproductive Success ◽  
Parental Investment ◽  
Life History Traits ◽  
Life History Strategies ◽  
Lifetime Reproductive Success ◽  
Fitness Components ◽  
Adult Sex Ratio ◽  
Males And Females

Males and females evolved distinct life-history strategies, reflected in diverse life-history traits, summarized as sexual dimorphism. Life-history traits are highly interlinked. The sex that allocates more resources towards offspring is expected to increase its life span, and this might require an efficient immune system. However, the other sex might allocate its resources towards ornamentation, and this might have immunosuppressive effects. Activity of immune response may not be specific to the sex that produces the eggs but could correlate with the amount of parental investment given. Informed by experimental data, we designed a theoretical framework that combines multiple life-history traits. We disentangled sex-biased life-history strategies from a particular sex to include species with reversed sex-roles, and male parental investment. We computed the lifetime reproductive success from the fitness components arising from diverse sex-biased life-history traits, and observed a strong bias in adult sex ratio depending on sex-specific resource allocation towards life-history traits. Overall, our work provides a generalized method to combine various life-history traits with sex-specific differences to calculate the lifetime reproductive success. This was used to explain certain empirical observations as a consequence of sexual dimorphism in life-history traits.

Body size and age structure of the endangered Clark’s lizard (Darevskia clarkorum) populations from two different altitudes in Turkey

2016 ◽  
Vol 37 (4) ◽  
pp. 450-456 ◽  
Author(s):  
Ufuk Bülbül ◽  
Muammer Kurnaz ◽  
Ali İhsan Eroğlu ◽  
Halime Koç ◽  
Bilal Kutrup
Keyword(s):  
Body Size ◽  
Age Structure ◽  
Sexual Maturity ◽  
Age At Maturity ◽  
Maximum Life Span ◽  
Breeding Populations ◽  
Size And Age Structure ◽  
Males And Females ◽  
The Mean ◽  
Different Altitudes

We investigated age structure, body size and longevity in two breeding populations ofDarevskia clarkoruminhabiting altitudes ranging from 450 m a.s.l. (Kamilet) to 2250 m a.s.l. (Başyayla) in Turkey by skeletochronology performed on the phalanges. The mean age was found to be 6 years in the Kamilet population and 7 years in the Başyayla population. The maximum life span was 10 years in the lowland population while it was 12 years in the highland population. Age at sexual maturity of both males and females was 1-2 years in the lowland population while it was 2-3 for both sexes in the highland population. Both age and SVL of specimens from the Kamilet population were significantly different between the sexes while age and SVL did not differ significantly between the sexes in Başyayla population. As a conclusion, we observed that the mean age, longevity and age at maturity were increased by altitude while there was a decrease based on the mean SVL in the highland population ofD. clarkorum. Our data on body size, longevity and age at sexual maturity may contribute to conservation efforts for this endangered species.

Variation within and between Rivers in Adult Size and Sea Age at Maturity of Anadromous Brown Trout, Salmo trutta

1991 ◽  
Vol 48 (6) ◽  
pp. 1015-1021 ◽  
Author(s):  
Jan Henning L'Abée-Lund
Keyword(s):  
Brown Trout ◽  
Sexual Maturity ◽  
Salmo Trutta ◽  
Adult Size ◽  
Age At Maturity ◽  
Migration Distance ◽  
Spawning Area ◽  
Brown Trout Salmo Trutta ◽  
Males And Females ◽  
The Mean

I compared adult size and sea age at sexual maturity among nine populations of anadromous brown trout, Salmo trutta, in two Norwegian rivers to determine the extent of inter- and intrariverine variations. Variation in the mean length of spawners and in the mean sea age at sexual maturity were mainly dependent on the variations found within rather than between rivers. Mean lengths and mean age at maturity of males increased significantly with increasing altitude of the spawning area and with migration distance in freshwater. In females, positive significant correlations were found with mean lengths and altitude of the spawning area and with mean sea age at maturity and both spawning site altitude and migration distance. Mean lengths and ages of males and females were not significantly correlated with the rate of water discharge in the streams during spawning. The size of gravel substrate for spawning was of minor importance in explaining interpopulation variation in mean female size. The increase noted in mean length and in mean sea age at maturity of both males and females is probably an adaptation to greater energy expenditure to reach the uppermost natal spawning areas.

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