Navigation Links
Disappearing nannies force parents to accept their duties
Date:4/12/2013

Large helpers (nannies) in a cichlid fish allow the dominant male and female to reduce their personal contribution to their offspring and territory, according to new research published today in Functional Ecology.

By removing the large helper for 30 days which corresponds to one breeding cycle in this species a team from the University of Bristol and the University of Bern (Switzerland) studied the investment strategies of the dominant pair and the survival of their brood, while checking for immigration of new helpers.

Dr Rick Bruintjes, NERC Science & Business Marine Renewable Energy Fellow at the University of Bristol described: "In the cichlid Julidochromis ornatus, one large male helper spends almost all of his time close to the breeding shelter, whereas the dominant pair is only around half of their time. By removing the large helper we found that one day after removal the dominants increased territorial duties, however, seven days after removal the initial higher investment was back to pre-removal levels."

Senior statistician Dr Dik Heg from the University of Bern said: "Already after seven days, 36 per cent of the removal groups had a new large subordinate immigrant. Only with a new immigrant large helper did dominants relax their territorial duties, showcasing the benefit of having a large subordinate for the dominant pair."

MSc Zina Heg-Bachar, research assistant at the University of Bern, explained: "Removal of the nanny did not change survival rates of fry and small fish, most likely because the parents and/or the new nanny compensated for the absence of the original nanny."

This study shows the importance of large helpers in allowing the dominant pair to reduce their personal contribution to their offspring. Moreover, it highlights the importance of immigration of new helpers to relieve dominants from carrying out parental behaviours in cooperative breeding systems.


'/>"/>

Contact: Caroline Clancy
caroline.clancy@bristol.ac.uk
44-011-792-88086
University of Bristol
Source:Eurekalert

Page: 1

Related biology news :

1. Disappearing grasslands: ASU scientists to study dramatic environmental change
2. Disappearing bacterium may protect against stroke
3. International collaboration to investigate disappearing reptiles and amphibians
4. ONR outreach focuses on Pacific total force
5. Undersea warriors, undersea medicine: The future force
6. Lab-on-a-chip detects trace levels of toxic vapors in homes near Utah Air Force Base
7. Not-so-precious: Stripping gold from AFM probes allows better measurement of picoscale forces
8. Researchers and communities at risk join forces in volcano study
9. Scientists join forces in call for action to save coral reefs
10. Force of nature: Defining the mechanical mechanisms in living cells
11. University of Leeds and Chinese Academy of Sciences join forces
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/9/2017)... , Feb. 9, 2017 The biomass boiler ... of the biomass boiler market globally in terms of ... biomass boilers. The market for biomass boilers has been ... end-user, application, and country/region. The market based on feedstock ... forest residues, biogas & energy crops, urban residues, and ...
(Date:2/8/2017)... The biometrics market has reached a ... organizations, desires to better authenticate or identify users ... challenge questions), biometrics is quickly working its way ... is driven by use cases, though there traditionally ... uses cases, with consumer-facing use cases encompassing authentication, ...
(Date:2/7/2017)... New York , February 7, 2017 ... as ID Global Solutions Corporation [OTC: IDGS], ("Ipsidy" or ... management and electronic transaction processing services, is pleased to ... of the Company. Effective January 31, 2017, ... the Board of Directors, CEO and President.  An experienced ...
Breaking Biology News(10 mins):
(Date:2/22/2017)... ... February 22, 2017 , ... ... and scientists from around the world, is pleased to announce the 2nd annual ... 23, 2017. This premier, online-only conference focused on the development and advancements in ...
(Date:2/22/2017)... Dublin - Research and Markets has announced ... Type, By Application, By End User, By Region, By Country: Opportunities ... ... is forecasted to grow at a CAGR of 11.33% during 2016-2021. ... protection market is driven by the surging demand for less toxic ...
(Date:2/22/2017)... 2017 Aethlon Medical, Inc. (Nasdaq: ... that validated the ability of the Aethlon HemopurifierĀ® to ... mortality in immune-suppressed sepsis patients and also contribute to ... objective of the study was to validate the ... (EBV) and Herpes Simplex virus 1 (HSV1) by the ...
(Date:2/22/2017)... ... February 22, 2017 , ... Pharma and biotech consulting firm ... director. Operating from Pennsideā€™s Zurich headquarters, Pennside Partners, GmbH, Mr. Perkins brings 14 ... more than a decade with leading market research firm, GfK. He began his ...
Breaking Biology Technology: