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Plasma osmolyte concentrations and rectal gland mass of bull sharks Carcharhinus leucas, captured along a salinity gradient

Overview of attention for article published in Comparative Biochemistry & Physiology Part A: Molecular & Integrative Physiology, July 2004
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Title
Plasma osmolyte concentrations and rectal gland mass of bull sharks Carcharhinus leucas, captured along a salinity gradient
Published in
Comparative Biochemistry & Physiology Part A: Molecular & Integrative Physiology, July 2004
DOI 10.1016/j.cbpb.2004.05.006
Pubmed ID
Authors

Richard D Pillans, Craig E Franklin

Abstract

Bull sharks (Carcharhinus leucas) were captured across a salinity gradient from freshwater (FW) to seawater (SW). Across all salinities, C. leucas were hyperosmotic to the environment. Plasma osmolarity in FW-captured animals (642 +/- 7 mosM) was significantly reduced compared to SW-captured animals (1067 +/- 21 mosM). In FW animals, sodium, chloride and urea were 208 +/- 3, 203 +/- 3 and 192 +/- 2 mmol l(-1), respectively. Plasma sodium, chloride and urea in SW-captured C. leucas were 289 +/- 3, 296 +/- 6 and 370 +/- 10 mmol l(-1), respectively. The increase in plasma osmolarity between FW and SW was not linear. Between FW (3 mosM) and 24 per thousand SW (676 mosM), plasma osmolarity increased by 22% or 0.92% per 1 per thousand rise in salinity. Between 24 per thousand and 33 per thousand, plasma osmolarity increased by 33% or 4.7% per 1 per thousand rise in salinity, largely due to a sharp increase in plasma urea between 28 per thousand and 33 per thousand. C. leucas moving between FW and SW appear to be faced with three major osmoregulatory challenges, these occur between 0-10 per thousand, 11-20 per thousand and 21-33 per thousand. A comparison between C. leucas captured in FW and estuarine environments (20-28 per thousand ) in the Brisbane River revealed no difference in the mass of rectal glands between these animals. However, a comparison of rectal gland mass between FW animals captured in the Brisbane River and Rio San Juan/Lake Nicaragua showed that animals in the latter system had a significantly smaller rectal gland mass at a given length than animals in the Brisbane River. The physiological challenges and mechanisms required for C. leucas moving between FW and SW, as well as the ecological implications of these data are discussed.

Mendeley readers

Mendeley readers

The data shown below were compiled from readership statistics for 79 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Mozambique 1 1%
United Kingdom 1 1%
United States 1 1%
Unknown 76 96%

Demographic breakdown

Readers by professional status Count As %
Student > Master 16 20%
Student > Bachelor 15 19%
Researcher 12 15%
Student > Ph. D. Student 7 9%
Student > Doctoral Student 6 8%
Other 13 16%
Unknown 10 13%
Readers by discipline Count As %
Agricultural and Biological Sciences 43 54%
Environmental Science 12 15%
Biochemistry, Genetics and Molecular Biology 4 5%
Earth and Planetary Sciences 3 4%
Medicine and Dentistry 2 3%
Other 2 3%
Unknown 13 16%
Attention Score in Context

Attention Score in Context

This research output has an Altmetric Attention Score of 3. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 18 November 2016.
All research outputs
#8,535,472
of 25,374,647 outputs
Outputs from Comparative Biochemistry & Physiology Part A: Molecular & Integrative Physiology
#531
of 1,865 outputs
Outputs of similar age
#20,967
of 59,041 outputs
Outputs of similar age from Comparative Biochemistry & Physiology Part A: Molecular & Integrative Physiology
#3
of 7 outputs
Altmetric has tracked 25,374,647 research outputs across all sources so far. This one is in the 43rd percentile – i.e., 43% of other outputs scored the same or lower than it.
So far Altmetric has tracked 1,865 research outputs from this source. They typically receive a little more attention than average, with a mean Attention Score of 5.4. This one is in the 40th percentile – i.e., 40% of its peers scored the same or lower than it.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 59,041 tracked outputs that were published within six weeks on either side of this one in any source. This one is in the 12th percentile – i.e., 12% of its contemporaries scored the same or lower than it.
We're also able to compare this research output to 7 others from the same source and published within six weeks on either side of this one. This one has scored higher than 4 of them.