Demographic life history traits in a population of a critically endangered species, Darevskia dryada (Darevsky & Tuniyev, 1997)

2018 ◽  
Vol 68 (1) ◽  
pp. 27-37 ◽  
Author(s):  
Abdullah Altunışık ◽  
Halit Eksilmez
Keyword(s):  
Endangered Species ◽  
Life Span ◽  
Age Structure ◽  
Sexual Maturity ◽  
Life History Traits ◽  
Critically Endangered ◽  
Critically Endangered Species ◽  
Reproductive Life ◽  
Reproductive Life Span ◽  
Males And Females

AbstractKnowing the age structure of endangered species is important in order to contribute to future conservation studies for such species. In this context, we investigated age structure, age at sexual maturity, potential reproductive lifespan and longevity in a population of the Charnali lizard,Darevskia dryada, an endangered species from Turkey. The results show that the Charnali lizard has a longer life span than other lizards of the genusDarevskiathat live in the same region. We estimated that these lizards attain their sexual maturity at the age of one or two years and the potential reproductive life span for males and females is six and five years, respectively. As in many other lizards, the Charnali lizard exhibited a low-level male-biased sexual dimorphism in terms of increased size. We believe that this study, in which prior information related to the Charnali lizard is shared, will contribute to future conservation activities for this critically endangered species.

Allometric growth, sexual maturity, and life cycle of Aegla lata (Decapoda, Anomura), a critically endangered species

2019 ◽  
Vol 39 (6) ◽  
pp. 748-757
Author(s):  
Mariane R Chaves ◽  
Ingrid C Marçal ◽  
Roberto M Shimizu ◽  
Sérgio Ls Bueno ◽  
Gustavo M Teixeira
Keyword(s):  
Endangered Species ◽  
Sexual Maturity ◽  
Development Stage ◽  
Critically Endangered ◽  
Adult Males ◽  
Allometric Growth ◽  
Southern Limit ◽  
Critically Endangered Species ◽  
Small Streams ◽  
Males And Females

Abstract Aegla lata Bond-Buckup & Buckup, 1994 is a critically endangered species, extinct in its type-locality. Its currently known geographical distribution is restricted to small streams of the lower Tibagi River Basin (Paraná state, southern Brazil), where it is vulnerable to the environmental degradation that takes place in these watersheds. Scientific knowledge on the species is limited to the original description and a few occurrence records. No information about its biology is available. Aiming to fill this gap, we investigated the relative growth, sexual maturity, sexual dimorphism, and the reproductive and recruitment periods of A. lata. Monthly sampling occurred from May 2014 through June 2015 in the Bule stream in the southern limit of Mata dos Godoy State Park, Londrina, Paraná state, Brazil (23°27ʹ20.86″S, 51°16ʹ32.44″W). The analysis of allometric growth was used to differentiate juveniles and adults. According to the development stage of the chelae, two sequential groups of adult males were recognized (morphotypes I and II). The estimated average cephalothorax length (CL) at the onset of morphometric maturity of males and females are similar, suggesting puberty molt takes place at nearly the same size in both sexes. Males and females are heterochelous, with a clear predominance of the left chela as the most developed of the pair. Both chelae are larger in adult males than in adult females of similar CL. The reproductive period is markedly seasonal, extending from the austral autumn to winter (May to August), as well as those recorded in other species of Aegla from similar latitudes. A single annual recruitment pulse was detected from October 2014 to February 2015.

Age structure and body size of a critically endangered species, Acanthodactylus harranensis (Squamata: Lacertidae) and its demography

2019 ◽  
Vol 69 (4) ◽  
pp. 421-431
Author(s):  
Nurettin Beşer ◽  
Çetin Ilgaz ◽  
Yusuf Kumlutaş ◽  
Aziz Avcı ◽  
Kamil Candan ◽  
...  
Keyword(s):  
Body Size ◽  
Endangered Species ◽  
Age Structure ◽  
Critically Endangered ◽  
Age Group ◽  
Lizard Species ◽  
Critically Endangered Species ◽  
Area Of Occupancy ◽  
The Mean ◽  
Number Of Individuals

Abstract Within reptiles, lizards cover less area across the globe than snakes do. One out of every seven known species of lizards in the world is found only in its type locality. Acanthodactylus harranensis Baran, Kumlutaş, Lanza, Sindaco, Ilgaz, Avcı & Crucitti, 2005, is one of these species. It is an endemic lizard species in Turkey with a very small area of occupancy and is listed in the critically endangered category (CR) by the IUCN. Here we document the age structure and body size of A. harranensis using skeletochronological methods for the first time and aim to point out current problems and contribute to an understanding of its demography. The mean age of males was found to be significantly higher than that of females. The maximum life span was 10 years in males while it was 9 years in females. The 8-year-old age group contained a higher number of individuals than any other age group. The mean snout-vent length of specimens was not significantly different between the sexes. As in many other lizards, A. harranensis exhibits a low-level male-biased sexual dimorphism. Acanthodactylus harranensis also displayed a considerably bigger body size than other studied lacertids from Şanlıurfa province. The data presented in this study may contribute to future conservation efforts for this endangered species.

Life-history traits in green toad (Bufo viridis) populations: indicators of habitat quality

2007 ◽  
Vol 85 (5) ◽  
pp. 665-673 ◽  
Author(s):  
Ulrich Sinsch ◽  
Christoph Leskovar ◽  
Anja Drobig ◽  
Astrid König ◽  
Wolf-Rüdiger Grosse
Keyword(s):  
Land Use ◽  
Life History ◽  
Life Span ◽  
Habitat Quality ◽  
Life History Traits ◽  
Life History Trait ◽  
Bufo Viridis ◽  
Human Land Use ◽  
Reproductive Life ◽  
Reproductive Life Span

Five life-history traits (age and size at maturity, longevity, potential reproductive life span, age-dependent growth rate) were investigated in four Bufo viridis Laurenti, 1768 (=  Pseudepidalea viridis (Laurenti, 1768)) populations that inhabited localities at similar altitude (60–100 m above sea level) and latitude (50°N–51°N, Germany), but that differed in habitat quality (i.e., human land use within a radius of 1 km around the breeding site). The age of 374 males and of 127 females collected during the breeding period was estimated using skeletochronology on phalange bones. We tested the hypothesis that sex and habitat quality account for detectable amounts of local variation in life-history traits. Significant sexual size dimorphism was present in all populations. Gender-specific variation in size was mainly accounted for by age, but also to a minor extent by habitat quality. In males, age at maturity varied between 1 and 3 years and was the only life-history trait that was significantly related to the intensity of human land use. In contrast, land-use indices covaried significantly with female longevity (6–15 years) and potential reproductive life span (5–12 years). Our pilot study suggests that, in B. viridis, life-history traits derived from the local age structure may be useful as indicators of habitat quality.

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.

Potential for adaptation-by-time in sockeye salmon (Oncorhynchus nerka): the interactions of body size and in-stream reproductive life span with date of arrival and breeding location

2009 ◽  
Vol 87 (8) ◽  
pp. 708-717 ◽  
Author(s):  
K. K. Doctor ◽  
T. P. Quinn
Keyword(s):  
Body Size ◽  
Life Span ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Arrival Date ◽  
Temporal Segregation ◽  
Reproductive Life ◽  
Reproductive Life Span ◽  
Males And Females ◽  
Breeding Location

In salmonid fishes, the tendency to return to the natal site for breeding leads to reproductively isolated, locally adapted populations. In addition to this isolation-by-space, the heritability of breeding date can result in temporal segregation or isolation of breeding units. We examined the interaction between breeding location (spatial segregation) and arrival date (temporal segregation) for two fitness-related traits, reproductive life span and body size, of sockeye salmon ( Oncorhynchus nerka (Walbaum in Artedi, 1792)) in a small Alaskan stream. Analysis of data on tagged individuals over 9 years revealed that both males and females arriving early to the spawning grounds tended to spawn farther upstream than those arriving later, demonstrating the potential for segregation in time and space within the population. Both body length and reproductive life span also consistently varied with arrival date. Larger males and females entered the stream before smaller individuals, and individuals of both sexes that arrived early lived longer in the stream than those that arrived later. However, neither reproductive life span nor body size varied significantly with breeding location, indicating that the linkage between spatial and temporal structure in this breeding population is incomplete, and that segregation in time may currently be the dominant component of within-population structure.

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.

Where have all the sawfishes gone? Perspectives on declines of these Critically Endangered species in Sri Lanka

2021 ◽  
Author(s):  
Akshay Tanna ◽  
Daniel Fernando ◽  
Ramajeyam Gobiraj ◽  
Buddhi M. Pathirana ◽  
Sahan Thilakaratna ◽  
...  
Keyword(s):  
Sri Lanka ◽  
Endangered Species ◽  
Critically Endangered ◽  
Critically Endangered Species

scholarly journals The Oral Bacterial Community in Melanophryniscus admirabilis (Admirable Red-Belly Toads): Implications for Conservation

2021 ◽  
Vol 9 (2) ◽  
pp. 220
Author(s):  
Michele Bertoni Mann ◽  
Janira Prichula ◽  
Ícaro Maia Santos de Castro ◽  
Juliana Mello Severo ◽  
Michelle Abadie ◽  
...  
Keyword(s):  
Endangered Species ◽  
Bacterial Community ◽  
High Throughput Sequencing ◽  
Dietary Diversity ◽  
Natural Habitat ◽  
Critically Endangered ◽  
Personal Genome ◽  
Oral Microbiota ◽  
Critically Endangered Species ◽  
Anthropogenic Environment

Melanophryniscus admirabilis (admirable red-belly toad) is a microendemic and critically endangered species found exclusively along 700 m of the Forqueta River, in a fragment of the Atlantic Forest of southern Brazil. One of the greatest concerns regarding the conservation of this species is the extensive use of pesticides in areas surrounding their natural habitat. In recent years, the adaptation and persistence of animal species in human-impacted environments have been associated with microbiota. Therefore, the present study aimed to characterize the oral bacterial community of wild M. admirabilis and to address the question of how this community might contribute to this toad’s adaptation in the anthropogenic environment as well as its general metabolic capabilities. A total of 11 oral samples collected from wild M. admirabilis were characterized and analyzed via high-throughput sequencing. Fragments of the 16S rRNA variable region 4 (V4) were amplified, and sequencing was conducted using an Ion Personal Genome Machine (PGM) System with 316 chips. A total of 181,350 sequences were obtained, resulting in 16 phyla, 34 classes, 39 orders, and 77 families. Proteobacteria dominated (53%) the oral microbiota of toads, followed by Firmicutes (18%), Bacteroidetes (17%), and Actinobacteria (5%). No significant differences in microbial community profile from among the samples were reported, which suggests that the low dietary diversity observed in this population may directly influence the bacterial composition. Inferences of microbiome function were performed using PICRUSt2 software. Important pathways (e.g., xenobiotic degradation pathways for pesticides and aromatic phenolic compounds) were detected, which suggests that the bacterial communities may serve important roles in M. admirabilis health and survival in the anthropogenic environment. Overall, our results have important implications for the conservation and management of this microendemic and critically endangered species.

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