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:5/3/2016)... Lithuania , May 3, 2016  Neurotechnology, ... released the MegaMatcher Automated Biometric Identification System ... of large-scale multi-biometric projects. MegaMatcher ABIS can process ... accuracy using any combination of fingerprint, face or ... MegaMatcher SDK and MegaMatcher Accelerator ...
(Date:4/28/2016)... April 28, 2016 First quarter 2016:   ... 966% compared with the first quarter of 2015 The ... 589.1 M (loss: 18.8) and the operating margin was 40% (-13) ... Cash flow from operations was SEK 249.9 M (21.2) ... guidance is unchanged, SEK 7,000-8,500 M. The operating margin ...
(Date:4/26/2016)... April 27, 2016 Research ... Multi-modal Biometrics Market 2016-2020"  report to their offering.  ... The analysts forecast the global multimodal ... 15.49% during the period 2016-2020.  Multimodal ... sectors such as the healthcare, BFSI, transportation, automotive, ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... Chapel Hill, N.C. (PRWEB) , ... June 27, ... ... of U.S. commercial operations for Amgen, will join the faculty of the ... will serve as adjunct professor of strategy and entrepreneurship at UNC Kenan-Flagler, with ...
(Date:6/24/2016)... 24, 2016 Epic Sciences unveiled a ... susceptible to PARP inhibitors by targeting homologous recombination ... The new test has already been incorporated into ... cancer types. Over 230 clinical trials ... pathways, including PARP, ATM, ATR, DNA-PK and WEE-1. ...
(Date:6/23/2016)... ... June 23, 2016 , ... ... announce the launch of their brand, UP4™ Probiotics, into Target stores nationwide. The ... is proud to add Target to its list of well-respected retailers. This list ...
(Date:6/23/2016)... -- Houston Methodist Willowbrook Hospital has signed a ... serve as their official health care provider. As ... provide sponsorship support, athletic training services, and most ... athletes and families. "We are excited ... to bring Houston Methodist quality services and programs ...
Breaking Biology Technology: