Animal Behaviour, Journal Year: 2024, Volume and Issue: unknown, P. 123037 - 123037
Published: Dec. 1, 2024
Language: Английский
Ecology and Evolution, Journal Year: 2025, Volume and Issue: 15(1)
Published: Jan. 1, 2025
ABSTRACT Modification and deterioration of old‐growth forests by industrial forestry have seriously threatened species diversity worldwide. The loss natural habitats increases the concentration circulating glucocorticoids incurs chronic stress in animals, influencing immune system, growth, survival, lifespan animals inhabiting such areas. In this study, we tested whether great tit ( Parus major ) nestlings grown unmanaged coniferous longer telomeres than developing young managed forests. This study showed that patches had lower larval biomass Since insect larvae are preferred food for nestlings, shortage may divert energy resources away from which can show up as physiological stress, often raising heterophil/lymphocyte (H/L) ratio. H/L ratio revealed a significant difference levels, being highest young‐managed pine We also found development significantly shorter Although nestling survival did not differ between habitats, growing greater telomere lengths, positively affect their lifespan. Our results suggest forest affected represent ecological traps, birds deteriorated environments age structure populations.
Language: Английский
Citations
0
Biology Letters, Journal Year: 2025, Volume and Issue: 21(2)
Published: Feb. 1, 2025
It is important to know whether organs age at the same rate and are equally affected by developmental conditions as this provides insights into causes of ageing. However, data on organ-specific telomere dynamics remain scant. In a previous study early life amphibian Xenopus laevis , we detected changes in lengths gut cells, while liver, heart muscle telomeres were unchanged; larval rearing temperature had minimal effects. Here, extend that examine four treatments from 70-day post-metamorphic juvenile through sexually mature (2-year-old) adults. Telomeres shortened adult gut, hindlimb muscle. contrast, liver did not change with but shorter if was warm. Organ influenced sex only Warmer temperatures also associated longer juveniles. Hence, pre-metamorphic can influence dynamics, loss between stages occurs different those earlier life. These findings indicate existence organ-dependent ageing rates across lifetimes, potentially related environmental history.
Language: Английский
Citations
0
Ecology and Evolution, Journal Year: 2024, Volume and Issue: 14(3)
Published: March 1, 2024
Abstract Life‐history theory predicts that reproductive investments are traded‐off against self‐maintenance. Telomeres, the protective caps on ends of chromosomes, offer a promising avenue for assessing life‐history trade‐offs, as they shorten in response to stressors and predictive remaining lifespan. In males, testosterone frequently mediates part, through its effects sexual ornamentation, which is an important aspect investment. However, studies within‐individual associations between telomere dynamics ornamentation limited number have produced mixed results. Furthermore, most such been observational, making it difficult discern nature any causal relationship. To address this, we used short‐acting implants free‐living male superb fairy‐wrens ( Malurus cyaneus ) stimulate production ornament: early moult into costly blue breeding plumage. We found no evidence elevated testosterone, consequent earlier plumage, accelerated shortening. therefore followed up with systematic review two meta‐analyses (28 studies, 54 effect sizes) exploring telomeres (1) (2) ornamentation. line our experimental findings, neither meta‐analysis showed overall correlation or length dynamics. meta‐regression experimental, compared reported greater trade‐offs. Our highlight need further better understand potential responses
Language: Английский
Citations
2
Molecular Ecology, Journal Year: 2023, Volume and Issue: 32(19), P. 5382 - 5393
Published: Aug. 22, 2023
Abstract Exposure to rising sublethal temperatures can affect development and somatic condition, thereby Darwinian fitness. In the context of climate warming, these changes could have implications for population viability, but they be subtle consequently difficult quantify. Using telomere length (TL) as a known biomarker condition in early life, we investigated impact pre‐hatching nestling on six cohorts wild superb fairy wrens ( Malurus cyaneus ) temperate south‐eastern Australia. Models incorporating only information from phase were best supported compared those including (pre‐)laying incubation (previously shown mass) or both phases combined. This implies that TL is most sensitive ambient phase. The top model showed negative relationship between early‐life mean daily minimum temperature when rainfall was low which gradually became positive with increasing rainfall. addition, there frequency hot days (daily maximum ≥35°C), although rare short‐term. Including other period, variables (e.g., diurnal variability) did not improve prediction TL. Overall, our results suggest cooler nights conditions are dry short‐term spikes above 35°C during conducive maintenance. While findings indicate potential pathway warming wildlife fitness, emphasize need elucidate mechanisms underlying complex associations.
Language: Английский
Citations
5
Deleted Journal, Journal Year: 2024, Volume and Issue: 97(3), P. 157 - 163
Published: April 12, 2024
AbstractTwo prominent theories of aging, one based on telomere dynamics and the other mass-specific energy flux, propose biological time clocks senescence. The relationship between these two theories, proposed by each, remains unclear. Here, we examine relationships shortening rate, metabolic lifespan among vertebrates (mammals, birds, fishes). Results show that rate increases linearly with decreases nonlinearly increasing body mass in same way as rate. also both are similarly related to strongly predict differences lifespan, although slopes less than linear. On average, then, telomeres shorten a fixed amount per unit flux. So mitotic clock energetics-based described can be viewed alternative measures clock. These processes may linked, speculate, through process cell division.
Language: Английский
Citations
1
Molecular Ecology, Journal Year: 2023, Volume and Issue: 32(14), P. 4031 - 4043
Published: May 12, 2023
Abstract Telomeres are well known for their associations with lifespan and ageing across diverse taxa. Early‐life telomere length can be influenced by developmental conditions has been shown positively affect lifetime reproductive success in a limited number of studies. Whether these effects caused change lifespan, rate or perhaps most importantly senescence is unclear. Using long‐term data on female breeding from threatened songbird (the hihi, Notiomystis cincta ), we show that the early‐life individuals predicts presence future key traits: clutch size hatching success. In contrast, fledging not associated length, which may due to added influence biparental care at this stage. does predict species. Females therefore allocation strategy depending early conditions, hypothesise reflected length. Our results offer new insights role telomeres play individual fitness suggest used as predictor life history
Language: Английский
Citations
3
Molecular Ecology, Journal Year: 2023, Volume and Issue: 32(24), P. 6913 - 6923
Published: Oct. 21, 2023
Early-life conditions impact fitness, but whether the combined effect of extrinsic stressors is additive or synergistic not well known. This a major knowledge gap because exposure to multiple frequent. Telomere dynamics may be instrumental when testing how interact many factors affect telomere shortening, and shortening predicts survival. We evaluated manipulated brood size natural infestation by carnid fly Carnus hemapterus on nestling growth wild jackdaws (Corvus monedula). length, measured in blood using TRF, shortened average 264 bp, average, infection induced more shortening. Further analyses showed that enlarged broods, nestlings' telomeres parasitized, while reduced broods there was no conclude number siblings rate: blood-sucking parasites negatively increasing cell proliferation and/or physiological stress, coping with less successful increased sibling competition. Larger nestlings had shorter independent age, manipulation infection. Growth were lighter at fledging. Our findings indicate (i) evaluating consequences early-life environmental isolation yield full picture due effects, (ii) effects cryptic, for example, telomeres, fitness expressed beyond temporal framework study.
Language: Английский
Citations
2
Ecology, Journal Year: 2024, Volume and Issue: 105(6)
Published: May 9, 2024
The risk of predation directly affects the physiology, behavior, and fitness wild birds. Strong social connections with conspecifics could help individuals recover from a stressful experience such as event; however, competitive interactions also have potential to exacerbate stress. Few studies investigated interaction between environmental stressors landscape in bird populations. In 2 years field studies, we experimentally simulated attempts on breeding female tree swallows (Tachicyneta bicolor). At same time, manipulated breast plumage color, key signal. Simulated events early nestling period reduced young nestlings' mass by approximately 20% shortened telomere lengths. Ultimately, only 31% nestlings group fledged compared 70% control nestlings. However, effects experimental manipulations were timing dependent: following year when swapped order during incubation, there no significant condition or fledging success. Contrary our expectations, manipulation environment did not affect response predation. manipulating reduce skeletal size mass, although depended original brightness. Our data demonstrate that transient birds can carry-over their if they occur critical periods season.
Language: Английский
Citations
0
Science Advances, Journal Year: 2024, Volume and Issue: 10(37)
Published: Sept. 11, 2024
Telomere length (TL) is increasingly recognized as a molecular marker that reflects how reproductive aging affects intergenerational transmissions. Here, we investigated the effects of parental age on offspring survival and regulation TL by examining telomere-elongating activity telomerase in Pacific oyster. We assessed classical hallmarks parents at three classes (young, middle-aged, old) crossbred them using split-brood design to examine consequences nine maternal-by-paternal combinations their offspring. Reproductive leads increased larval mortality accelerated telomere shortening spats, rendering more susceptible infection Ostreid herpesvirus. Viral exposure stimulates activity, response identified adaptive, but weakened aging. While lengthens spat’s telomere, paradoxically, longer individual predicts higher adults. The telomerase-telomere complex appeared conservative biomarker for distinguishing survivors losers upon polymicrobial diseases.
Language: Английский
Citations
0
Animal Behaviour, Journal Year: 2024, Volume and Issue: unknown, P. 123037 - 123037
Published: Dec. 1, 2024
Language: Английский
Citations
0