Dietary variation and overlap in D’Orbigny’s slider turtles<i>Trachemys dorbigni</i>(Duméril and Bibron 1835) (Testudines: Emydidae)

Hahn, Anelise Torres; Rosa, Clarissa Alves da; Bager, Alex; Krause, Lı́gia

doi:10.1080/00222933.2013.840400

Cited by 9 publications

(10 citation statements)

References 21 publications

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“…As in this study, Bager et al (2010), in southern Brazil, have reported that females were greater than males of the T. dorbigni. The diet of some freshwater turtle species may vary qualitatively and quantitatively between males and females, as observed for T. dorbigni (Hahn et al, 2014;Silveira et al, 2019); these authors found significant gender differences, with females having a diet which included a greater diversity of food items than males. Hahn et al (2014) reported that animal origin items (both invertebrate and vertebrate) accounted for 16.4% of the total food items in females as contrasted to 8.3% in males.…”

Section: Discussionmentioning

confidence: 93%

“…Ferguson & Smales (2006), evaluated the helminth assemblage of Emydura macquarii (Gray, 1830) (Chelidae), having identified 11 species (Nematoda, Digenea, Aspidogastrea, Monogenoidea and Amphilinidae); these authors concluded that dietary strategies significantly contributed to the variety of helminth species, once most of these species are transmitted through food webs interactions involving intermediate hosts. Trachemys dorbigni is an opportunistic omnivorous species according to studies conducted in Rio Grande do Sul State, Brazil, by Bujes et al (2007), Hahn et al (2014), Mascarenhas & Coimbra (2013) and Silveira et al (2019). After the collection of helminths of present study, Silveira et al (2019) analyzed the diet of the specimens and identified several items such as: gastropod molluscs, crustaceans (Cladocera, Decapoda), Blattodea oothecae, dipteran larvae and pupae, ants, filamentous algae.…”

Section: Discussionmentioning

confidence: 99%

“…Esch et al (1979), upon analyzing the diversity of intestinal helminth Trachemys scripta (Thunberg in Schoepff, 1792) (Emydidae) in six habitats thermally influenced by a nuclear reactor noted greater diversity as to chemical and physical characteristics in more stable places, suggesting that diversity may result from the complexity of the parasiteʼs life cycle. In order to evaluate diet influence on helminth acquisition, one should also take into account that the diet of freshwater turtles can vary in relation to maturity and gender (Teran et al, 1995;Souza, 2004;Brasil et al, 2011;Hahn et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

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Helminth’s assemblage of Trachemys dorbigni (Testudines: Emydidae) in southern Brazil: implications of anthropogenic environments and host’s genders

Mascarenhas

Silva

Müller

2021

Iheringia, Sér. Zool.

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The assemblage of helminths of Trachemys dorbigni was analyzed according two environments (rural and urban) and according to host’s gender. Thus, the helminths found were: Spiroxys contortus (Rudolphi, 1819), Falcaustra affinis (Leidy, 1856), Camallanus emydidius Mascarenhas & Müller, 2017, Dioctophyme renale (Goeze, 1782) (larvae), Eustrongylides sp. (larvae) (Nematoda), Telorchis corti (Stunkard, 1915), Telorchis achavali Mañé-Garzón & Holcman-Spector, 1973, Telorchis spp. (Digenea), Polystomoides rohdei Mañé-Garzón & Holcman-Spector,1968 and Neopolystoma sp. (Monogenoidea). Parasitological indices suggests that S. contortus, F. affinis, C. emydidius, T. corti and P. rohdei are species common in helminth assemblage of T. dorbigni in southern Brazil. Infection by Dioctophyme renale is typical of the urban area and suggest relation with eutrophication process and feedback of parasitic cycle in the freshwater urban environment. Parasitological indices of Neopolystoma sp. and T. achavali suggest to be occasional infections; whereas infection by Eustrongylides sp. could be considered accidental. About Telorchiidae, there was no co-occurrence of the species of this group for the examined hosts. In relation to host’s gender, it was observed that infections by S. contortus, F. affinis, C. emydidius and T. corti had higher rates in females, showing a more intimate association with the females of T. dorbigni. The results suggest that human impact on the environment could affect the infrapopulacional dynamics of parasite species influencing the presence and rates of infection of helminths or exacerbating heterogeneities related to host’s gender.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Helminth’s assemblage of Trachemys dorbigni (Testudines: Emydidae) in southern Brazil: implications of anthropogenic environments and host’s genders

Mascarenhas

Silva

Müller

2021

Iheringia, Sér. Zool.

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“…Comparing prey taxon richness in the diet of males and females only based on raw food item counts produces incorrect results because of differences in sampling effort between sexes or among populations (Colwell et al 2004;Hahn et al 2014), and different sample sizes (Krebs 1999). Therefore, we estimated expected prey taxon accumulation curves (sample-based rarefaction curves; Krebs 1999) and interpolated their 95% confidence intervals using the Software for Ecological Methodology (Version 7.2, Exeter Software, Setauket, New York, USA).…”

Section: Methodsmentioning

confidence: 99%

Feeding ecology of the common sun skink,Eutropis multifasciata(Reptilia: Squamata: Scincidae), in the plains of central Vietnam

Ngo

Hoang

et al. 2015

Journal of Natural History

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We studied the feeding ecology of Eutropis multifasciata in the tropical plains of central Vietnam to understand better the foraging mode, spatiotemporal and sexual variation in dietary composition, and rarefaction curves of prey-taxon richness for males and females. Stomach contents (n = 161) were collected from October 2013 to May 2014 using a nonlethal stomach-flushing technique. A total of 680 food items (624 animal items and 56 plant items) was found in 161 stomachs of skinks, representing 19 unique animal categories. We found that the diet of E. multifasciata is composed mainly of small, sedentary and clumped prey and that this skink specialises on spiders, insect larvae, snails, grasshoppers and crickets (with a combined importance index of 60%). Dietary composition, prey size and total prey volume in E. multifasciata changed between dry and rainy seasons and among regions. The total volume of food items consumed by males was larger than that of females, and the diversity and evenness index of prey categories were larger in males than in females. However, using rarefaction curves revealed that females have the higher prey-taxon richness after points between 130 and 140 prey items for frequency, and between 160 and 170 prey items for number of items, and the differences were not statistically significant. The foraging behaviour of E. multifasciata best fits a 'widely foraging' model.

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“…Segundo Bujes (2010) é necessário conhecer alguns aspectos para que as populações de T. dorbigni não se tornem escassas: maturidade sexual, impacto de criações clandestinas e o impacto da soltura de exemplares advindos do tráfico de animais. Aspectos como a dieta também devem ser considerados, sabe-se que a espécie possui uma dieta onívora generalista e que, assim como sua congênere T. scripta, a T. dorbigni também apresenta uma alimentação que tem preferência carnívora quando jovens se tornando mais herbívoras quando adultas (HANN, 2014). Poucos estudos são realizados para detalhar a dieta, preferência alimentar e demandas nutricionais de Trachemys dorbigni, principalmente no Brasil (CABRERA, 1998;GALLARDO 1977;BUJES et al, 2007, HANN, 2014.…”

Section: Importância Dos Estudos De Dieta Nas Tartarugas De áGua Doceunclassified

Estimativa da taxa de turnover e fator de discriminação isotópico em espécies de quelônios

Consolmagno¹

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Estimation of turnover rate and discrimination factor in species of chelonians The use of tracers such as stable carbon and nitrogen isotopes is crescent and complements the conventional techniques used in the studies referring to the diet in wild animals. This is possible because the isotopic value of the items used in the diet reflects their isotopic values on the tissues. The resulting isotopic difference called the discrimination factor or fractionation is associated with the metabolic processes required for nutrient incorporation to occur. The object of the study was to measure the incorporation time of isotopes into plasma and blood cells, components of re-portable non-lethal "tissue", and to determine the discriminant factor of five species of freshwater chelonians: Podocnemis expansa (Amazonia tortoise), Podocnemis unifilis (tracajá), Phrynops geofroanus (geoffroy´s side necked turtle), Trachemys scripta (red-eared slider turtle) and Trachemys dorbigni (d'orbigny's slider). The isotopic differences of 10 adult individuals of each species kept in captivity were measured through shifting diets with different isotopic values. With the diet variation, carbon and nitrogen turnover was estimated between 7 and 185 days by non-linear exponential regression, when the new fractionation factors were estimated. The turnover time for the chelonians species varied from 72 to 337 days for carbon, and from 29 to 270 days for the plasma nitrogen. In blood cells, the turnover ranged from 3 to 373 days for carbon, and from 51 to 216 days for nitrogen. Discrimination factors that were, in average, close to zero for carbon and between 3 and 4‰ for nitrogen ranged from 1.01 to 3.28‰ for 13 C and-0.76 to 0.49‰ for 15 N in plasma , and from 1.49 to 3.98‰ for 13 C and 0.99 to 4.69 for 15 N in blood cells, with a decrease of 3.7‰ and an increase of 6.2‰, respectively for carbon and nitrogen in the new diet. The difference found between the discrimination factors calculated before and after the diet shift, showed that stable isotopes incorporation probably occurs in a heterogenous way in tissues. According to the literature it was possible to analyze that factors such as isotopic memory, metabolic routes and reptiles characteristic elements are possibly linked to slower turnover, different from endothermic animals in which this process is faster.

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Dietary variation and overlap in D’Orbigny’s slider turtlesTrachemys dorbigni(Duméril and Bibron 1835) (Testudines: Emydidae)

Cited by 9 publications

References 21 publications

Helminth’s assemblage of Trachemys dorbigni (Testudines: Emydidae) in southern Brazil: implications of anthropogenic environments and host’s genders

Helminth’s assemblage of Trachemys dorbigni (Testudines: Emydidae) in southern Brazil: implications of anthropogenic environments and host’s genders

Feeding ecology of the common sun skink,Eutropis multifasciata(Reptilia: Squamata: Scincidae), in the plains of central Vietnam

Estimativa da taxa de turnover e fator de discriminação isotópico em espécies de quelônios

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