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:4/6/2017)... LONDON , April 6, 2017 ... Control, RFID, ANPR, Document Readers, by End-Use (Transportation & ... Energy Facility, Oil, Gas & Fossil Generation Facility, Nuclear ... Healthcare, Educational, Other) Are you looking for ... Authentication sector? ...
(Date:4/5/2017)... -- KEY FINDINGS The global market for ... of 25.76% during the forecast period of 2017-2025. The ... the growth of the stem cell market. ... INSIGHTS The global stem cell market is segmented on ... stem cell market of the product is segmented into ...
(Date:3/30/2017)...  On April 6-7, 2017, Sequencing.com will host the ... hackathon at Microsoft,s headquarters in Redmond, Washington ... developing health and wellness apps that provide a unique, ... is the first hackathon for personal genomics and ... in the genomics, tech and health industries are sending ...
Breaking Biology News(10 mins):
(Date:5/23/2017)... ... , ... Vortex Biosciences , provider of circulating tumor cell (CTC) capture ... using Vortex microfluidic technology ” in Nature Precision Oncology on May 8th. The ... and Dr. Matthew Rettig at the University of California, Los Angeles. The publication describes ...
(Date:5/23/2017)... ... May 23, 2017 , ... Cambridge Semantics , the leading ... year’s Bio-IT World Conference and Expo in Boston May 23-25 with a ... The Anzo Smart Data Lake is also a finalist for the Best of ...
(Date:5/22/2017)... ... May 22, 2017 , ... Cancer diagnostics and pathology workflow ... at the Association for Pathology Informatics Annual Summit at the Wyndham ... its Cancer Diagnostic Cockpit and Consultation Portal, Inspirata will present research it led ...
(Date:5/19/2017)... ... May 19, 2017 , ... The University ... researchers with technologies ripe for commercialization, and who are affiliated with the 21 ... to submit proposals. QED, now in its tenth round, is the first multi-institutional ...
Breaking Biology Technology: