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121 results for “reproductive seasonality”
Patterns of annual and seasonal immune investment in a temporal reproductive opportunist
<p> Historically, investigations of how organismal investments in immunity fluctuate in response to environmental and physiological changes have focused on seasonally breeding organisms that confine reproduction to seasons with relatively unchallenging environmental conditions and abundant resources. The red crossbill, <i>Loxia curvirostra,</i> is<i> </i>a songbird that can breed opportunistically if conifer seeds are abundant, on both short, cold, and long, warm days, providing an ideal system to investigate environmental and reproductive effects on immunity. In this study, we measured inter- and intra-annual variation in complement, natural antibodies, PIT54, and leukocytes in crossbills across four summers (2010-2013) and multiple seasons within one year (summer 2011-spring 2012). Overall, we observed substantial changes in crossbill immune investment among summers, with interannual variation driven largely by food resources, while variation across multiple seasons within a single cone year was less pronounced and lacked a dominant predictor of immune investment. However, we found weak evidence that physiological processes (e.g., reproductive condition, moult) or abiotic factors (e.g., temperature, precipitation) affect immune investment. Collectively, this study suggests that a reproductively flexible organism may be able to invest in both reproduction and survival-related processes, potentially by exploiting rich patches with abundant resources. More broadly, these results emphasize the need for more longitudinal studies of trade-offs associated with immune investment.</p>
Data from: Exogenous kisspeptin enhances seasonal reproductive function in male Siberian hamsters
Animals living in temperate climates are faced with the challenge of reproducing only when environmental conditions are suitable for offspring survival. Environmental cues signalling current and future energy availability (e.g., food availability and photoperiod respectively) are used to appropriately time reproduction. The precise neuroendocrine mechanisms regulating reproduction in response to these cues are unknown. The goal of the present study was to investigate a functional role for kisspeptin, a neuropeptide that shows promise as a key regulator of seasonal reproduction, in integrating multiple environmental cues to regulate reproduction in the Siberian hamster (Phodopus sungorus). Siberian hamsters undergo robust gonadal regression and terminate reproduction in unsuitable environments [short winter-like day lengths (photoperiods), low food availability]. Adult male hamsters were housed in short-day or intermediate photoperiods, received either ad-libitum access to food or mild food restriction, and were treated with either kisspeptin or a vehicle for 6 weeks to determine the ability of kisspeptin to attenuate gonadal regression. Hamsters exhibited varying degrees of gonadal regression in response to inhibitory environments (short-day photoperiod, food restriction). Kisspeptin treatment successfully enhanced testis mass under these inhibitory conditions, but did not affect normal seasonal changes in body mass and food intake. Thus, kisspeptin specifically enhanced reproductive function without altering other, non-reproductive physiological responses to these environmental treatments. The inhibitory environmental conditions used in this study caused little if any decline in serum luteinizing hormone (LH) and testosterone over the course of the experiment. Kisspeptin treatment tended to exacerbate the decline in LH within individuals, but there were no significant effects of kisspeptin when comparing changes in the hormone levels amongst groups. The interesting outcome that kisspeptin enhanced testis mass, apparently independently of hypothalamic endocrine mechanisms, suggests the possibility of local kisspeptin action within the gonads. Overall, we show a functional role for kisspeptin in integrating complex environmental information to specifically support reproduction. Future work should focus on direct effects of kisspeptin at the gonadal level of the HPG axis as well as its interactions with the metabolic functions and other hormones involved in reproduction, e.g., gonadotropin-inhibitory hormone (GnIH).
Data from: Synchronized shift of oral, fecal and urinary microbiotas in bats and natural infection dynamics during seasonal reproduction
Seasonal reproduction is a period of extreme physiological and behavioral changes, yet we know little about how it may affect host microbial communities (i.e. microbiota) and pathogen transmission. Here, we investigated shifts of the bacterial microbiota in saliva, urine and faeces during the seasonal reproduction of bats in South Africa, and test for an interaction in shedding patterns of both bacterial (Leptospira) and viral (adeno- and herpes-viruses) agents. Based on a comparative approach in two cave-dwelling bat species and high-throughput sequencing of the 16S rRNA gene, we demonstrated a clear signature in microbiota changes over the reproduction season, consistent across the multiple body habitats investigated, and associated with sex, age and reproductive condition of bats. We observed in parallel highly dynamic shedding patterns for both bacteria and viruses, but did not find a significant association between viral shedding and bacterial microbiota composition. Indeed, only Leptospira shedding was associated with alterations in both the diversity and composition of the urinary microbiota. These results illustrate how seasonal reproduction in bats substantially affects microbiota composition and infection dynamics, and have broad implications for the understanding of disease ecology in important reservoir hosts, such as bats.
Figure 8-11 from: Younis EM, Al-Asgah NA, Abdel-Warith A-WA, Gabr MH, Shamlol FS (2020) Analysis of reproductive biology and spawning season of the pink ear emperor Lethrinus lentjan, from marine ecosystem. Zoologia 37: 1-10. https://doi.org/10.3897/zoologia.37.e48475
Figure 8-11 Histological sections in the ovary of L. lantjan showing the maturation stages of female: (8) immature; (9) early maturation; (10) maturity; (11) spawning. (AO) atretic oocytes, (CY) coalesced secondary oocytes, (EF) empty follicles, (HY) hydrated oocytes, (LP) late perinucleolar, (PP) pre-perinucleolar, (PY) primary yolk vesicle oocytes, (SY) secondary yolk vesicle oocytes.
Figure 5-7 from: Younis EM, Al-Asgah NA, Abdel-Warith A-WA, Gabr MH, Shamlol FS (2020) Analysis of reproductive biology and spawning season of the pink ear emperor Lethrinus lentjan, from marine ecosystem. Zoologia 37: 1-10. https://doi.org/10.3897/zoologia.37.e48475
Figure 5-7 Histological sections in the testis of L. lantjan showing the maturation stages of male: (5) immature; (6) maturity; (7) spawning. (Ps) primary spermatocytes, (Ss) secondary spermatocytes, (S) sperm, (St) spermatids, (Sg) spermatogonia, (Sc& S) sperm cells and sperms outside the seminal vesicles
Data from: Synchronized shift of oral, fecal and urinary microbiotas in bats and natural infection dynamics during seasonal reproduction
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Data from: Artificial light at night desynchronises strictly seasonal reproduction in a wild mammal
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Data from: Experimental evidence for within- and cross-seasonal effects of fear on survival and reproduction
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Data from: Time scale matters: genetic analysis does not support adaptation-by-time as the mechanism for adaptive seasonal declines in kokanee reproductive lifespan
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Data from: Exogenous kisspeptin enhances seasonal reproductive function in male Siberian hamsters
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Data from: Diversity in reproductive seasonality in the three-spined stickleback, Gasterosteus aculeatus
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Data from: Reproductive state influences the degree of risk tolerance for a seasonally breeding mesopredator
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Patterns of annual and seasonal immune investment in a temporal reproductive opportunist
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Dataset & Scripts for : The climatic determinants of flexible reproductive seasonality in Africa-dwelling papionins
<p>Datasets (csv tables) and codes (R scripts) needed to run the analyses presented in the paper. </p>
Figure 5 in Non-seasonal reproduction in inseminating species of Mimagoniates (Characidae, Characiformes) from southern Brazil
Figure 5. Monthly values of the gonadosomatic index (GSI) for males (A) and females (B) of Mimagoniates rheocharis from site 1 in Maquiné, RS, Brazil, between January 1998 and February 1999. Open circles = average value.
Seasonal divergence in reproductive timing on the verge of spring: comparing hypothalamic transcriptome of two seasonally sympatric North American songbird populations.
GEO Series GSE305857. Junco hyemalis. 13 samples. Type: Expression profiling by high throughput sequencing.
FIGURE 3 in Does The Reproductive Season Account For More Records Of Birds In A Marked Seasonal Climate Landscape In The State Of São Paulo, Brazil?
FIGURE 3: Species accumulation curves of the observed number of species according to breeding (solid lines) and nonbreeding seasons (dotted lines) at the Jardim Botânico (a) and at the UNESP campus (b), Bauru, state of São Paulo, southeastern Brazil, from September 2005-November 2006.
High throughput small RNA and transcriptome sequencing reveal reproduction-related microRNAs and mRNA in ovary of Geese in Counter-Season Production
GEO Series GSE130245. Anser cygnoides. 6 samples. Type: Expression profiling by high throughput sequencing.
FSHβ links photoperiodic signalling in the mediobasal hypothalamus to seasonal reproduction in Japanese quail.
GEO Series GSE241772. Coturnix japonica. 54 samples. Type: Expression profiling by high throughput sequencing.
FSHβ links photoperiodic signalling in the pituitary gland to seasonal reproduction in Japanese quail.
GEO Series GSE241774. Coturnix japonica. 54 samples. Type: Expression profiling by high throughput sequencing.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
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The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
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