Animal Biology最新文献_第6页

Life history variation between two Eurasian tree sparrow Passer montanus populations at different altitudes 欧亚两种树雀在不同海拔地区的生活史差异

IF 1.2 4区生物学

Animal Biology Pub Date : 2022-09-27 DOI: 10.1163/15707563-bja10090

Shaobin Li, Hao-Ran Gao, Jinlong Liu, Chongmou Li, Guopan Li, Dayong Li

{"title":"Life history variation between two Eurasian tree sparrow Passer montanus populations at different altitudes","authors":"Shaobin Li, Hao-Ran Gao, Jinlong Liu, Chongmou Li, Guopan Li, Dayong Li","doi":"10.1163/15707563-bja10090","DOIUrl":"https://doi.org/10.1163/15707563-bja10090","url":null,"abstract":"\u0000Altitudinal gradients create environmental variation that can strongly affect avian life history strategies. To fully understand this issue, a comparison of the demography of populations of the same species over large altitudinal differences is required. Here, we investigated the breeding ecology of two populations of Eurasian tree sparrow (Passer montanus), one in the temperate zone of central China at an altitude of 30 m and another in the alpine zone of the northeastern Tibetan plateau at an altitude of 3430 m. The breeding ecology of this species was rarely studied at such a high altitude before. Our result revealed that high-altitude tree sparrows started breeding later, had a shorter breeding period (80 versus 140 days), produced smaller broods (1.2 versus 2.5 chicks) and had significantly smaller clutches (4.0 versus 4.9 eggs) but larger eggs (4272 versus 3443 mm3) when compared with their low-altitude counterparts. Besides, tree sparrows at our high-altitude site had longer nestling periods (14.5 versus 13.4 days) than those at the low-altitude site. High-altitude tree sparrows tend to have reduced fecundity but allocate more energy into each offspring to confront the stressful conditions at high altitudes. The observed patterns are consistent with adaptive life history strategies.","PeriodicalId":7876,"journal":{"name":"Animal Biology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47590966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Plasma lactate dehydrogenase and pyruvate kinase activity changes with body mass and age across birds and mammals 鸟类和哺乳动物的血浆乳酸脱氢酶和丙酮酸激酶活性随体重和年龄的变化

IF 1.2 4区生物学

Animal Biology Pub Date : 2022-06-24 DOI: 10.1163/15707563-bja10087

Morgan R. Wynkoop, Clara Cooper-Mullin, A. G. Jiménez

{"title":"Plasma lactate dehydrogenase and pyruvate kinase activity changes with body mass and age across birds and mammals","authors":"Morgan R. Wynkoop, Clara Cooper-Mullin, A. G. Jiménez","doi":"10.1163/15707563-bja10087","DOIUrl":"https://doi.org/10.1163/15707563-bja10087","url":null,"abstract":"\u0000Birds and mammals produce most adenosine triphosphate (ATP) through mitochondrial oxidative phosphorylation, but when oxygen is not present in sufficient levels, ATP can be produced through anaerobic glycolysis. Pyruvate kinase (PK) catalyzes the final step of glycolysis by converting phosphoenolpyruvate and adenosine diphosphate (ADP) into pyruvate and ATP. Lactate dehydrogenase (LDH) is important for anaerobic glycolysis by catalyzing the conversion of pyruvate into lactate. In this study, we measured LDH and PK activities in plasma from birds and mammals in order to determine the relationship between LDH and PK with respect to body mass and age. Our results show that birds had a higher LDH and PK activity compared with mammals. There is a positive relationship between body mass and plasma LDH activity in birds only. However, this relationship disappears when the data are phylogenetically corrected. We did not observe a significant relationship between plasma LDH and age in birds or mammals. Plasma PK activity was negatively correlated with body mass in birds but not in mammals and positively associated with age in both birds and mammals. The relationship between LDH and PK with respect to body mass and age may be complex due to differences in metabolism in birds and mammals. Increases in LDH and PK activity with body mass in birds may be linked to anaerobic demands of flight, especially in larger birds. A decrease in LDH activity with age/MLSP (maximum lifespan) in mammals may reflect a differing metabolic shift as compared with birds. Increases in PK with age in both mammals and birds may help them cope with greater energetic needs as cells age.","PeriodicalId":7876,"journal":{"name":"Animal Biology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44959864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Oviposition preference of pink bollworm, Pectinophora gossypiella on cotton 粉红棉铃虫对棉花的产卵偏好

IF 1.2 4区生物学

Animal Biology Pub Date : 2022-06-23 DOI: 10.1163/15707563-bja10088

V. Shah, R. Pande, P. Verma, N. Gokte-Narkhedkar, Y. Prasad

{"title":"Oviposition preference of pink bollworm, Pectinophora gossypiella on cotton","authors":"V. Shah, R. Pande, P. Verma, N. Gokte-Narkhedkar, Y. Prasad","doi":"10.1163/15707563-bja10088","DOIUrl":"https://doi.org/10.1163/15707563-bja10088","url":null,"abstract":"\u0000The effect of four cultivated species of cotton on the oviposition behaviour and/or preference of pink bollworm, Pectinophora gossypiella was studied under laboratory conditions. Blends of volatile organic compounds from squares of all four species of cotton (Gossypium arboreum, G. herbaceum, G. hirsutum, G. barbadense) were identified using gas chromatography-mass spectroscopy (GC-MS). Differences were observed across the species with respect to the relative proportion of identified compounds, viz., pinene, carene, caryophyllene, humulene and γ terpinene. In order to evaluate the ovipositional preference of pink bollworm, a series of no-choice and choice experiments were conducted using square extract, artificial blend-treated muslin cloth and cotton twig as substrate for oviposition. All four species of cotton had differences in the volatile blend composition that were reflected in the mean number of eggs laid under no-choice and choice experiments. A substantially higher number of eggs was laid on cotton twig under both no-choice and choice experiments than on square extract and artificial blend treatments. In both no-choice and choice experiments G. herbaceum was found to be the least preferred for egg laying compared to the other three species.","PeriodicalId":7876,"journal":{"name":"Animal Biology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46678824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Comparative genetic research on Microtus mystacinus (de Filippi, 1865) distributed in Asia and Europe inferred from mitochondrial (CYTB and COXI) and nuclear (IRBP) gene regions 从线粒体(CYTB和COXI)和核(IRBP)基因区推断分布于亚洲和欧洲的密迹鼠(Microtus mystacinus, de Filippi, 1865)的比较遗传学研究

IF 1.2 4区生物学

Animal Biology Pub Date : 2022-06-22 DOI: 10.1163/15707563-bja10084

D. Çetintürk, N. Yigit, R. Castiglia, G. Senczuk, E. Çolak

{"title":"Comparative genetic research on Microtus mystacinus (de Filippi, 1865) distributed in Asia and Europe inferred from mitochondrial (CYTB and COXI) and nuclear (IRBP) gene regions","authors":"D. Çetintürk, N. Yigit, R. Castiglia, G. Senczuk, E. Çolak","doi":"10.1163/15707563-bja10084","DOIUrl":"https://doi.org/10.1163/15707563-bja10084","url":null,"abstract":"\u0000The East European vole Microtus mystacinus is the most widespread vole species in Anatolia. It is also frequently seen in watery habitats in a large area of Eurasia. In this paper, an attempt was made to ascertain the level of genetic differentiation between Anatolian (Asian part of Turkey) and Turkish Thracian (European part of Turkey) populations together with additional data from other parts of Asia and Europe by analysing two mitochondrial (cytochrome-b and cytochrome oxidase subunit I) and one nuclear (interphotoreceptor retinoid binding protein) gene regions. Acquired Bayesian Inference trees mostly separated the Asian and European populations of M. mystacinus and the fixation index values implied a significant differentiation between these populations for mitochondrial DNA. On the other hand, the median-joining networks did not show diverging populations, significantly, and the mean genetic distance values among populations were found to be low for both mitochondrial and nuclear DNA. Evolutionary divergence times of Asian and European populations were also calculated and dated back to approximately 0.316–0.111 million years ago, coinciding with the ice ages of the Pleistocene epoch. According to the obtained results, M. mystacinus populations have not diverged enough to form different species; however, there is a separation between Asian and European populations which might result in speciation.","PeriodicalId":7876,"journal":{"name":"Animal Biology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48730177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Weapon shape variation of male morphotypes in two freshwater prawn species genus Macrobrachium (Decapoda: Palaemonidae) 大臂虾属两种淡水对虾雄性形态的武器形态变异(十足目:对虾科)

IF 1.2 4区生物学

Animal Biology Pub Date : 2022-06-22 DOI: 10.1163/15707563-bja10082

C. S. Nogueira, J. A. Pantaleão, R. C. Costa

{"title":"Weapon shape variation of male morphotypes in two freshwater prawn species genus Macrobrachium (Decapoda: Palaemonidae)","authors":"C. S. Nogueira, J. A. Pantaleão, R. C. Costa","doi":"10.1163/15707563-bja10082","DOIUrl":"https://doi.org/10.1163/15707563-bja10082","url":null,"abstract":"\u0000Many animal groups can develop weapons that originate from specialized modifications in different body regions. Decapods are a classic example of organisms that develop these weapons. In this group, we can find specific appendages modified to claws that are used during agonistic conflicts, as is the case between dominant and submissive male morphotypes in freshwater prawns. Our study aimed to analyze the shape, size, and morphological integration of claw components (propodus and dactyl) in male morphotypes of two freshwater prawn congeners (Macrobrachium amazonicum and M. brasiliense). Claws of the prawns were photographed and marked with landmarks and semilandmarks for the acquisition of shape variables. The shape of the propodus and dactyl was statistically different between almost all morphotypes of the two species. The size of structures differed statistically between all morphotypes. The claws of almost all morphotypes showed a high degree of morphological integration; however, statistical differences were observed only between the morphotypes of M. brasiliense. The variation in the shape and degree of morphological integration of the claws between the morphotypes of M. amazonicum was less evident when compared to the morphotypes of M. brasiliense, which may be related to distinct patterns in the development of chelipeds of each species, that is, homochely and heterochely, respectively. Thus, the exaggerated development of a cheliped (heterochely) can cause greater variation in the shape of this structure, also influencing the degree of morphological integration between its components, as evidenced in this study.","PeriodicalId":7876,"journal":{"name":"Animal Biology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47188867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Breeding ecology of Kessler’s thrush (Turdus kessleri) in the western Sichuan plateau 川西高原凯斯勒画眉（Turdus kessleri）的繁殖生态

IF 1.2 4区生物学

Animal Biology Pub Date : 2022-06-14 DOI: 10.1163/15707563-bja10083

Yulin Gao, H. Xiao, Hong Zhou, Zejun Zhang

{"title":"Breeding ecology of Kessler’s thrush (Turdus kessleri) in the western Sichuan plateau","authors":"Yulin Gao, H. Xiao, Hong Zhou, Zejun Zhang","doi":"10.1163/15707563-bja10083","DOIUrl":"https://doi.org/10.1163/15707563-bja10083","url":null,"abstract":"\u0000The breeding of most high-altitude birds remains poorly known. We studied the breeding ecology of Kessler’s thrush (Turdus kessleri) and documented reproductive information throughout the nestling periods in the western Sichuan plateau. The data included natural nest sites, nest components, nest size, egg-laying dates, egg morphology, egg size, clutch size, egg incubation, nestling brooding and feeding, nestling morphology and growth, and reproductive outcome. The study found that T. kessleri used the old nest to breed. As the nestling grew, the female’s nestling brooding time decreased, and the feeding frequency of parent birds increased at first and then decreased. The frequency of clearing feces was positively correlated with the feeding frequency. The difference in the feeding frequency of both parents may be attributed to their division of labor, with a distinct difference between their investments. The parent birds’ cost of reproduction per nestling varies from one breeding period to the next. Predation by natural enemies is the main factor leading to reproductive failure in T. kessleri. This suite of life-history and behavioral strategies enables fledgling T. kessleri to cope with the harsh environments of mountains at higher altitudes.","PeriodicalId":7876,"journal":{"name":"Animal Biology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46224627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Variation in bird taxonomic distinctness, but not body mass or niche overlap, explains the robustness of Neotropical seed dispersal networks 鸟类分类独特性的变化，而不是体重或生态位重叠，解释了新热带种子传播网络的稳健性

IF 1.2 4区生物学

Animal Biology Pub Date : 2022-06-08 DOI: 10.1163/15707563-bja10086

M. A. Manhães, Wesley O. de Lima, Fábio B. Palácio

{"title":"Variation in bird taxonomic distinctness, but not body mass or niche overlap, explains the robustness of Neotropical seed dispersal networks","authors":"M. A. Manhães, Wesley O. de Lima, Fábio B. Palácio","doi":"10.1163/15707563-bja10086","DOIUrl":"https://doi.org/10.1163/15707563-bja10086","url":null,"abstract":"\u0000Frugivory and seed dispersal are fundamental ecological processes for the maintenance and conservation of tropical forest areas and ecosystem resilience. Here we investigated factors that could affect the relationship between frugivorous birds and fruit consumption, such as body mass, niche relationships, and species taxonomic groups, and the effects of such factors on the robustness of mutualistic bird-plant interaction networks. More specifically, we used Horn-Morisita niche overlap, the body mass coefficient of variation, and the variation in taxonomic distinctness index (varTD) as explanatory variables, and we applied multiple linear regression to test the that increased robustness in bird-plant frugivory networks occurs where birds have larger trophic niche overlaps and lower body mass variations and decreased robustness where they are more taxonomically diverse, in response to less functional redundancy. The analysis was based on literature data and fecal samples of birds collected after mist netting procedures. Bird body mass and niche overlap did not explain the variation in robustness in seed dispersal networks. However, different from expected, the results showed an effect of variations in taxonomic distinctness, suggesting that the larger the taxonomic distinctness of birds in a frugivore assemblage, the larger the robustness of the networks. Some hypotheses were suggested to explain this effect. Regardless of the factors that lead varTD to favor the robustness of mutualistic bird-plant networks, the results demonstrated that conserving diversity above the species level, and not just species limited to a few taxonomic groups, can be an important strategy for ecosystem conservation over time.","PeriodicalId":7876,"journal":{"name":"Animal Biology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45878768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Roost selection and ecology of Hipposideros pomona in China 中国pomona的栖息地选择与生态学

IF 1.2 4区生物学

Animal Biology Pub Date : 2022-06-08 DOI: 10.1163/15707563-bja10081

Qiulin Guo, Jinhe Wang, Yaping Yang, Guojun Zhang, W. Liu, Hongxing Niu, YanZhen Bu

{"title":"Roost selection and ecology of Hipposideros pomona in China","authors":"Qiulin Guo, Jinhe Wang, Yaping Yang, Guojun Zhang, W. Liu, Hongxing Niu, YanZhen Bu","doi":"10.1163/15707563-bja10081","DOIUrl":"https://doi.org/10.1163/15707563-bja10081","url":null,"abstract":"\u0000Hipposideros pomona is a typical cave-dwelling bat (IUCN endangered), and its roost selection mechanism has not been studied. From January 2018 to December 2020, 135 potential roosts were investigated in mainland China. To understand the impact of cave microclimate, structure, surrounding and human disturbance on roost selection of H. pomona, 16 variables related to microclimate and roost characteristics were measured. The differences in environmental conditions in the roost of this species in different seasons were studied. The roost preferences of H. pomona were evaluated using independent-samples t-tests and chi-squared tests. The major environmental factors affecting the selection of roosts were determined by principal components analysis (PCA). The results were as follows: (1) H. pomona preferred free-hanging with a cluster spatial arrangement in small rooms deep in the caves. (2) H. pomona and other species of bats all tended to live in natural caves. However, compared to other bats, H. pomona preferred to roost in caves with relatively lower cave ceilings, more entrances, and farther from residential areas. Roosts of H. pomona were warmer and wetter with significantly lower levels of disturbance than those without H. pomona. (3) H. pomona preferred to hibernate in natural caves with little human disturbance and higher temperature and relative humidity. (4) Compared with nonbreeding roosts, breeding roosts of H. pomona had more areas covered by water and had a higher temperature and relative humidity. (5) The PCA analysis showed that microclimate factors, structure factors, and geographical factors were significant environmental factors for H. pomona roost selection.","PeriodicalId":7876,"journal":{"name":"Animal Biology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42725809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Sexual dimorphism in the mountain dragon, Diploderma micangshanensis (Squamata: Lacertilia: Agamidae) from central China 中国中部山龙米康山双皮虫的两性异形

IF 1.2 4区生物学

Animal Biology Pub Date : 2022-06-08 DOI: 10.1163/15707563-bja10085

J. Xiong, Yinlong Bai, Guanglu Li, Z. You

{"title":"Sexual dimorphism in the mountain dragon, Diploderma micangshanensis (Squamata: Lacertilia: Agamidae) from central China","authors":"J. Xiong, Yinlong Bai, Guanglu Li, Z. You","doi":"10.1163/15707563-bja10085","DOIUrl":"https://doi.org/10.1163/15707563-bja10085","url":null,"abstract":"\u0000Sexual dimorphism (SD) is a common phenomenon in the animal kingdom, especially in lizards. The mountain dragon (Diploderma micangshanensis) is a Chinese endemic that is widely distributed in montane regions of northern Sichuan, western Hubei Province, southern Gansu, Henan, and Shanxi Provinces. However, little is known about its morphology, ecology, behavior, physiology, and natural history. In this study, SD in size and shape in a population of D. micangshanensis from Henan Province, Central China was examined based on a sample of 35 males and 23 females. Sexual dimorphism was observed in a few body shape variables (e.g., head and trunk length) but not in body size (snout-vent length). Males had longer and wider heads and shorter trunks. Sexual dimorphism in these traits can be explained by the sexual selection, ecological divergence, and fecundity advantage hypotheses. Additional studies of the ecology, reproductive biology, natural history, and behavior of D. micangshanensis are needed to evaluate the relative contributions of these mechanisms to determining the patterns of SD observed in this population.","PeriodicalId":7876,"journal":{"name":"Animal Biology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43313582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Geographic variation in reproductive investment of seven populations of male Brown frog (Rana kukunoris), endemic to the eastern Tibetan Plateau 青藏高原东部7个雄性褐蛙种群生殖投资的地理变异

IF 1.2 4区生物学

Animal Biology Pub Date : 2022-06-01 DOI: 10.1163/15707563-bja10080

T. Yu, H. Y. Li, Bo-Jian Chen, Pengli Chen, Xiangwen Liu, Yu Wang

{"title":"Geographic variation in reproductive investment of seven populations of male Brown frog (Rana kukunoris), endemic to the eastern Tibetan Plateau","authors":"T. Yu, H. Y. Li, Bo-Jian Chen, Pengli Chen, Xiangwen Liu, Yu Wang","doi":"10.1163/15707563-bja10080","DOIUrl":"https://doi.org/10.1163/15707563-bja10080","url":null,"abstract":"\u0000Life-history theory suggests that male anurans living in harsh and unpredictable environmental conditions (e.g., low temperature and/or high seasonality) should decrease reproductive investment because of short periods of activity and poor productivity. Although geographic variations in female life-history traits have been investigated intensively across a wide range of taxa, similar studies in males have been scarce. Here, we examined geographic variation in male testis mass of the brown frog (Rana kukunoris) across seven different altitudes on the eastern Tibetan plateau, and tested the hypothesis that relative size of testis mass should increase with increasing temperature and/or decreasing seasonality. In this study, we found male body condition, age and testis mass did not increase with temperature and temperature seasonality, which do not conform to our previous hypothesis, revealing that differences in temperature and temperature seasonality across populations could not drive the evolution of testis size. However, we found a positive correlation between testis mass and body condition or age when controlling for population and the effect of temperature and temperature seasonality, indicative of a condition-dependent expression of testis size. In addition, a correlation between testis mass and operational sex ratio was not significant, suggesting that male–male competition did not lead to increasing levels of sperm competition.","PeriodicalId":7876,"journal":{"name":"Animal Biology","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41596916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0