[MARMAM] New publication on bottlenose dolphin growth in Israel

Dani Kerem dankerem at research.haifa.ac.il
Thu Mar 6 23:00:46 PST 2014


 

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Dear MARMAM  list members,    
 
The article below has just been published online:
 
Dan Kerem, Rafi Kent, Mia Roditi-Elasar, Oz Goffman, Aviad Scheinin & Pavel
Gol'din (2014): Early physical maturation of female common bottlenose
dolphin Tursiops truncatus in the eastern Levantine Basin. Israel Journal of
Ecology & Evolution, DOI: 10.1080/15659801.2013.892297


Abstract

Regional resource limitation in the eastern Levantine Basin was predicted to
protract the growth of members of the Israeli sub-population of the common
bottlenose dolphin (CBD), compared to CBD sub-populations of similar adult
size. Growth curves were fitted to length-at-age data available for 24 male
and 26 female CBD stranded or incidentally caught along the Israeli
coastline between 2000 and 2009. The obtained model growth constants were
compared to those of other CBD sub-populations from the southeastern coast
of the United States and a correlation to regional seawater primary
productivity was sought. As in other sub-populations, local CBD females
initially grow faster than males for approximately 3-4 years and remain
longer until around eight years old, after which males surpass them in
length. Yet the steep early growth of females as well as its high rate of
decay was found to be extreme compared to other CBD sub-populations, with
99% of the asymptotic length being reached at the age of six years. A
positive correlation between seawater primary productivity and early growth
rate as well as growth decay constants could be demonstrated for CBD males
from Texas, Florida and Israeli coasts. Females of the same sub-population
presented a non-monotonic relationship to primary productivity. Early female
attainment of physical maturity in an ultra-oligotrophic region was
unpredicted and is not readily explained. It may accompany early
reproductive maturation, selected for as partial compensation for lower
lifelong reproductive success. 
If interested, the following Taylor & Francis link will last 50 free
downloads, after which PDF copies  may  be requested from me.
 
 <http://www.tandfonline.com/eprint/PZAtiUyG6Xmn2MqerUyJ/full>
http://www.tandfonline.com/eprint/PZAtiUyG6Xmn2MqerUyJ/full  
 
Cheers,
 
Dani

 

Dan H. Kerem, PhD 


IMMRAC (Israel Marine Mammal Research & Assistance Center)
The Recanati Institute for Maritime Studies

The Charney School for Marine Sciences
The University of Haifa
Mt. Carmel, Haifa 31905
Israel

  <http://maritime2.haifa.ac.il/eng/DK.asp>
http://maritime2.haifa.ac.il/eng/DK.asp
  <http://immrac.org/> http://immrac.org
Phone: 972-4-8249449
Fax: 972-4-9240493
e-mail:  <mailto:dankerem at research.haifa.ac.il>
dankerem at research.haifa.ac.il

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