Breaking News
March 18, 2019 - Taking painkillers during pregnancy is not responsible for asthma risk in children, study shows
March 18, 2019 - Prediagnosis Psychiatric Care Linked to Worse Cancer Mortality
March 18, 2019 - Paris hospital halts stool study after donor deluge
March 18, 2019 - Partial oral antibiotic therapy shows efficacy and safety in patients with infectious endocarditis
March 18, 2019 - Olympus improves access to science education through BioBus collaboration
March 18, 2019 - Depression screening does not improve quality of life in heart attack patients
March 18, 2019 - Echocardiography may aid in patient selection for TMVR
March 18, 2019 - Are ‘Inactive’ Ingredients in Your Drugs Really So Harmless?
March 18, 2019 - Scientists tackle rare retinal disease in unique research project
March 18, 2019 - Death By A Thousand Clicks
March 18, 2019 - Absorbable, antibiotic-eluting envelope can reduce rate of cardiac device infections
March 18, 2019 - Hormonal treatment associated with depression in men with prostate cancer
March 18, 2019 - Porvair Sciences launches reinforced 96-well deep round microplate
March 18, 2019 - Simplified catheter ablation could slash waiting lists for atrial fibrillation patients
March 18, 2019 - BFR therapy as part of rehabilitation following ACL surgery may slow bone loss
March 18, 2019 - A human model to test implants for cataract surgery
March 18, 2019 - New risk adjustment model could reduce financial penalty for safety net hospitals
March 18, 2019 - NHS cancer patients’ wait to start treatment worrying
March 18, 2019 - Inventiva Announces Results from Phase IIb Clinical Trial with Lanifibranor in Systemic Sclerosis
March 18, 2019 - Cologuard
March 18, 2019 - Researchers find evidence of prenatal environment tuning genomic imprinting
March 18, 2019 - Dolomite Bio launches novel Nadia product family for single-cell research
March 18, 2019 - Intellipharmaceutics Announces Resubmission of New Drug Application to the U.S. FDA for its Oxycodone ER
March 18, 2019 - Excessive gestational weight gain tied to maternal morbidity
March 18, 2019 - RCEM issues position statement on metrics to supplement four-hour standard target
March 17, 2019 - Noncontrast Brain MRI Effective for Monitoring Multiple Sclerosis
March 17, 2019 - Brain region plays key role in regulation of parenting behavior, study finds
March 17, 2019 - Natural speed limit on DNA replication sets pace for life’s first steps
March 17, 2019 - New research reveals overlooked impact of herbicide glyphosate on the environment
March 17, 2019 - Molecular patterns could help predict relapse risk in breast cancer patients
March 17, 2019 - Study confirms sensitivity of microbiological cultures for detecting cholera
March 17, 2019 - Scientists Spot Clues to Predicting Breast Cancer’s Return
March 17, 2019 - Scientists identify gene that keeps PTSD-like behavior at bay in female mice
March 17, 2019 - New method would allow doctors to detect earliest stages of cancers in the lymph nodes
March 17, 2019 - Cholesterol protein discovery raises hope for smarter drugs
March 17, 2019 - New insect medium delivers high viable cell density growth and protein yield
March 17, 2019 - Opioid crisis brings concerns about heart dangers
March 17, 2019 - Resistance Training May Prevent Type 2 Diabetes Progression
March 17, 2019 - Bioluminescence sensors make new approaches to drug discovery possible
March 17, 2019 - New FDA Rules Aim to Keep Kids From Flavored E-Cigarettes
March 17, 2019 - Vitamin B3 analogue boosts production of blood cells
March 17, 2019 - Government cuts to stop smoking services have detrimental impact on public health
March 17, 2019 - Common tool to assess potential adoptive parents lags behind societal changes
March 17, 2019 - Patients’ own cells could be the key to treating Crohn’s disease
March 17, 2019 - Diagnostic delays common in inflammatory bowel disease
March 17, 2019 - Study uncovers dramatic differences in the brains of Hispanics with dementia
March 17, 2019 - Study describes epigenetic loss that changes how cells obtain energy from cancer
March 16, 2019 - Active Bathing in Non-ICU Setting Does Not Cut Infections
March 16, 2019 - How the immune system maintains a healthy gut microbiota
March 16, 2019 - Bacteria ‘trap’ could help in the fight against antimicrobial resistance
March 16, 2019 - Hospital work environment associated with all EHR usability outcomes
March 16, 2019 - Study unravels mystery behind how the brain encodes time when forming long-term memories
March 16, 2019 - Light physical activity may lower risk of cardiovascular disease in older women
March 16, 2019 - USP15 enzyme could potentially lead to new treatments for breast, pancreatic cancer
March 16, 2019 - After Chinese Infant Gene-Editing Scandal, U.S. Health Officials Join Call for a Ban
March 16, 2019 - PACS1 syndrome – Genetics Home Reference
March 16, 2019 - Researchers discover an unexpected organization of antimicrobial molecules that amplifies immune response
March 16, 2019 - With New Study, Era of Open-Heart Surgery for Aortic Stenosis May be Ending
March 16, 2019 - Dolomite Bio introduces high throughput sNuc-Seq protocol for its Nadia Instrument
March 16, 2019 - New course prepares materials scientists for biomedical testing
March 16, 2019 - Finding clues to a functional HIV cure
March 16, 2019 - People with chronic periodontitis have higher risk for dementia
March 16, 2019 - Few heart care recommendations are based on rigorous study
March 16, 2019 - Colorectal cancer diagnosed at early age is distinct from that in older patients
March 16, 2019 - Researchers use MRI and AI techniques at birth to predict cognitive development at age 2
March 16, 2019 - Discarding information from the brain linked to more mental effort, finds study
March 16, 2019 - OTA International supplement provides current snapshot and forward look at global trauma systems
March 16, 2019 - NIH trial to track outcomes of liver transplantation from HIV+ donors to HIV+ recipients
March 16, 2019 - Apple Heart Study shows how wearable technology can help detect heart problem
March 16, 2019 - Researchers determine factors that cause stress development in the human body
March 16, 2019 - Elderly Men Undertreated for Osteoporosis
March 16, 2019 - People with chronic pain are coping with the help of Pinterest, new study reveals
March 16, 2019 - New study could reveal the complex interaction between languages and human beings who use them
March 16, 2019 - Tufts engineers develop new tool to identify metabolic signatures linked to disease
March 16, 2019 - New proteomics-based test could aid in early detection of ovarian cancer
March 16, 2019 - New research opens possibility of using sperm taken from testicles to overcome infertility
March 16, 2019 - Scientists find new proof that narcolepsy is an autoimmune disease
March 16, 2019 - FDA OKs a New Generic of the Blood Pressure Drug Valsartan to Ease Shortage Due to Recalls
March 16, 2019 - Eliminating smoking and obesity could affect racial health disparities
March 16, 2019 - Wearable tracking device achieves higher accuracy in position tracking using thermal sensors
Female birds become more promiscuous after hatchings fail in the first breeding attempt

Female birds become more promiscuous after hatchings fail in the first breeding attempt

image_pdfDownload PDFimage_print

Females of a socially monogamous passerine, the Japanese great tit (Parus minor), become more promiscuous after hatchings fail in the first breeding attempt — apparently attempting to ensure successful reproduction.

Many organisms, including human beings, form monogamous relationships. Birds do particularly so, with 90 percent of species exhibiting monogamous relationships. Indeed, a pair of birds conjures up the image of a “happily married couple.” Yet after paternity tests based on DNA analyses were introduced in the 1990s, it was discovered that, in more than 75 percent of monogamous bird species, females had mated with other male birds, producing offspring whose genetic father is not the mother’s partner — the phenomenon called extra-pair paternity.

“Universality of extra-pair paternity in monogamous birds was shocking and much research has been performed on extra-pair paternity among various species in the last 30 years. However, how flexibly individual females behave to changing circumstances when selecting mates has been largely unexamined due to the difficulty of controlling conditions in wild populations,” explains Itsuro Koizumi, an Associate Professor of Hokkaido University.

In the present study published in Behavioral Ecology, Koizumi and his students manipulated hatching success of a wild population of Japanese great tits, which are known to reproduce more than one time in a mating season. This experiment was conducted in Hokkaido University’s Tomakomai Experimental Forest in northern Japan.

All eggs laid in the first breeding by 11 pairs were replaced with artificial eggs to simulate hatching failure. These pairs were compared to 18 control pairs whose eggs were not manipulated. The researchers then examined how the degree of extra-pair paternity changes in their subsequent breeding attempt, speculating that females of experimental pairs would be more promiscuous to improve reproductive success in their second breeding attempt.

Paternity tests on 457 chicks from 58 broods using microsatellite DNA showed that 62 chicks, or 13.6 percent of the total, were born “out of wedlock.” While the rate of chicks born from extra-pair paternity in the control group was roughly the same in the first and second breeding attempt, the rate in the experimental group jumped significantly in the second attempt. The extra-pair paternity rate in the second brood of the experimental group was 40 percent higher than that of the control group.

There were only a few days between when the females learned of the hatching failure and the beginning of the second breeding attempt. This means that female birds in the experimental group swiftly decided to mate with other males while still in relationships with their original partners.

“Switching partners between the breeding attempts carries the risk of being unable to find a replacement partner in a timely manner. That seems to be why they stay with original partners but become more promiscuous to ensure successful reproduction,” says Dr. Teru Yuta of the Yamashina Institute for Ornithology, a former PhD student of Hokkaido University. “The reason females engage in extra-pair paternity has been a challenging puzzle for behavioral ecologists. This study not only suggests that individual females flexibly alter their mating behavior in an adaptive way, but also is the first experimental evidence for the ‘direct fertility benefit hypothesis’ which has been long-debated as the cause of the evolution of extra-pair paternity,” he added.

Tagged with:

About author

Related Articles