Navigation Links
High hormone levels in seabird chicks prepare them to kill their siblings
Date:6/18/2008

The Nazca booby, a Galpagos Island seabird, emerges from its shell ready to kill its brother or sister. Wake Forest University biologists and their colleagues have linked the murderous behavior to high levels of testosterone and other male hormones found in the hatchlings.

The study appears in the June 18 edition of the online journal PLoS ONE available at http://www.plosone.org/doi/pone.002460.

The elevated levels of male hormones, called androgens, increase aggression in both male and female chicks and prepare the birds to fight to the death as soon as they hatch, said David J. Anderson, professor of biology at Wake Forest and project leader.

Much of the field work was completed by Martina Mller, while she was a graduate student at Wake Forest.

"The older of two Nazca booby hatchlings unconditionally attacks and ejects the younger from the nest within days of hatching," Anderson said. Because Nazca boobies have difficulty raising more than one chick, it is important for the older chick to vanquish the younger one in order to increase its own chances of survival.

According to the study, the high hormone levels also cause the surviving chicks to behave like bullies after they grow up. They frequently seek out nestlings in their colony, and during those visits they often bite and push around the defenseless youngsters.

Blood samples were taken from Nazca booby chicks within 24 hours of hatching. In 15 nests with two eggs, blood samples were taken from both hatchlings. Samples were also taken from 15 hatchlings in one-egg nests. Then, blood hormones were analyzed by researchers at the University of Maryland, who co-authored the study. For comparison, the researchers did the same for blue-footed boobies, a closely related species.

The researchers suspect that the Nazca booby hatchlings experience the high level of aggression-related h
'/>"/>

Contact: Cheryl V. Walker
walkercv@wfu.edu
336-758-5237
Wake Forest University
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Circadian clock controls plant growth hormone
2. Study finds Viagra increases release of key reproductive hormone
3. Scientists uncover how hormones achieve their effects
4. Obesity-related hormone is higher in children with Down syndrome
5. Effects of social isolation traced to brain hormone
6. EMD Serono launches easypod, new electronic growth hormone injection device
7. Predicting growth hormone treatment success
8. Human hormone blocker found to help prevent obesity and diabetes: study
9. Research with squirrels provides clues on hormones role in human learning
10. MU researcher links hormone replacement therapy to breast cancer
11. NC State researchers identify genes key to hormone production in plants
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
High hormone levels in seabird chicks prepare them to kill their siblings
(Date:8/20/2015)... 20, 2015   Sensory, Inc ., a ... user experience and security of consumer electronics through ... that its TrulySecure™ is the first ... be FIDO Certified™. The FIDO (Fast ... the FIDO UAF (Universal Authentication Framework) 1.0 specifications, ...
(Date:8/18/2015)... 18, 2015  Navitas today announced that ... the Submission Content Management webinar scheduled on ... forum. Dedicated to the Implementation of Regulatory Submission ... for industry, vendors, health authorities, consultants and ... towards a standard method of implementing electronic ...
(Date:8/12/2015)... MINNETONKA, Minn. , Aug. 12, 2015   ... that supports the entire spectrum of clinical research, is ... ™ , the company,s comprehensive SaaS-based eClinical technology platform, ... growth during the first two quarters of 2015.   ... and second largest quarters measured by contract value sold ...
Breaking Biology News(10 mins):TrulySecure From Sensory Becomes First Face and Voice Biometrics Technology to be FIDO UAF Certified 2TrulySecure From Sensory Becomes First Face and Voice Biometrics Technology to be FIDO UAF Certified 3TrulySecure From Sensory Becomes First Face and Voice Biometrics Technology to be FIDO UAF Certified 4TrulySecure From Sensory Becomes First Face and Voice Biometrics Technology to be FIDO UAF Certified 5Navitas, a Key Contributor in IRISS Forum Webinar 2Navitas, a Key Contributor in IRISS Forum Webinar 3MedNet Solutions Experiences Explosive Corporate Growth 2
... country respond to a biological invader that reaches its ... invaders like Zebra mussels, Asian Longhorned Beetles, Kudzu, Triffid ... economic damage, destroying agriculture, harming human health and threatening ... the damage and cost of controlling invaders against the ...
... side effects such as nausea, liver toxicity and a battered ... deliver this life-saving therapy to cancer patients ― getting straight ... by Dr. Dan Peer of Tel Aviv University,s Department of ... and Nano Technology together with Prof. Rimona Margalit of the ...
... a cell underlay many cancers. Rui Martinho at the ... with researchers in Ghent (Belgium) and Bergen (Norway) will ... to proteins, identified in the test-tube, impact on the ... funded by the Association for International Cancer Research (AICR), ...
Cached Biology News:New analysis weighs lost trade, costs to control invasive species against economic damages 2New analysis weighs lost trade, costs to control invasive species against economic damages 3A cluster bomb for cancer care 2Understanding cancer using the fruit fly 2
(Date:8/27/2015)... Poway, CA (PRWEB) , ... August 27, 2015 ... ... a unique opportunity for venture capital funds, investment firms and animal health companies ... the Forum have raised $160 million. Several have also received licensing agreements or ...
(Date:8/27/2015)... , Aug. 27, 2015  Neogen Corporation (NASDAQ: ... the stock of United Kingdom -based ... microbiological culture media and diagnostic systems. ... into a leading provider of microbial testing and diagnostic ... testing markets. The company currently sells into more than ...
(Date:8/27/2015)... -- The National Necrotizing Fasciitis Foundation (NNFF) ... doctors at Vanderbilt University Hospital in Nashville, ... Dr. John Crew , director of the ... in Daly City, CA. ... by Dr. Crew, that had previously saved the lives ...
(Date:8/27/2015)... 2015 /PRNewswire/ - BIOREM Inc. (TSXV: BRM) ("Biorem" or "the Company") ... June 30, 2015. Biorem,s complete second quarter financial statements and MD&A ... HIGHLIGHTS: in ,000,s except earnings per shareThree-months ended , Six -months endedJune ... 2015 , 2014 Revenue , 4,709 ... Gross profit , 1,656 , 56 , ...
Breaking Biology Technology:VetStem Biopharma, Inc. Among Seventeen Companies Selected to Present at the KC Animal Health Investment Forum on September 1st 2015 2VetStem Biopharma, Inc. Among Seventeen Companies Selected to Present at the KC Animal Health Investment Forum on September 1st 2015 3Neogen acquires U.K.-based Lab M Holdings 2Patient's Life and Eyes Saved from Gruesome Flesh-Eating Infection Consuming Her Face 2Patient's Life and Eyes Saved from Gruesome Flesh-Eating Infection Consuming Her Face 3BIOREM Reports $718,000 Net Earnings for the Second Quarter 2BIOREM Reports $718,000 Net Earnings for the Second Quarter 3
... Joseph,s Hospital and Medical Center, Phoenix, today announced that it ... videoconferencing system to connect specialist physicians at the ... will include the Barrow Neurological Institute, as well as other ... , With the objective of further enhancing patient ...
... 17 Senetek PLC,(OTC Bulletin Board: SNKTY), a Life ... the science of healthy aging, today,announced that shareholders have ... the Annual General Meeting of Shareholders held on,December 16, ... are pleased with the results of the voting and ...
... Zeller appointed Senior Director, Regulatory Affairs-- , ... Microbia Precision Engineering, Inc. (Microbia) announced today that it ... capabilities with the appointments of Gaye Bok as Senior ... Director of Regulatory Affairs. , , ...
Cached Biology Technology:St. Joseph's Hospital and Medical Center to Utilize Clinical InfoNET System for Physicians 2St. Joseph's Hospital and Medical Center to Utilize Clinical InfoNET System for Physicians 3Senetek PLC Announces 2008 Annual General Meeting Voting Results 2Microbia PE Bolsters Senior Management Team; Positions Company for Commercializing Proprietary Bioproducts 2Microbia PE Bolsters Senior Management Team; Positions Company for Commercializing Proprietary Bioproducts 3
COMING SOON: Anti-Mouse C5a Receptor (CD88), Clone 10/92 Monoclonal Antibody...
Goat polyclonal to Sarcosine Oxidase (HRP) ( Abpromise for all tested applications). Antigen: Full length protein: Sarcosine Oxidase (microbial). Entrez Gene ID: 51268 Swiss Protein ID: ...
ANTI-RAT ADHESION MARKERS, CDs, CYTOKINES, ETC Rat ICAM PE - Mouse IgG1...
Mouse monoclonal [050-04] to C2 ( Abpromise for all tested applications). entrezGeneID: 717 SwissProtID: P06681...
Biology Products: