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Inferring population trends for the world's largest fish from mark?recapture estimates of survival

Overview of attention for article published in Journal of Animal Ecology, May 2007
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  • In the top 25% of all research outputs scored by Altmetric
  • High Attention Score compared to outputs of the same age (93rd percentile)

Mentioned by

blogs
2 blogs
policy
1 policy source
twitter
1 tweeter

Citations

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55 Dimensions

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223 Mendeley
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Title
Inferring population trends for the world's largest fish from mark?recapture estimates of survival
Published in
Journal of Animal Ecology, May 2007
DOI 10.1111/j.1365-2656.2006.01201.x
Pubmed ID
Authors

COREY J. A. BRADSHAW, HENRY F. MOLLET, MARK G. MEEKAN

Abstract

1. Precise estimates of demographic rates are key components of population models used to predict the effects of stochastic environmental processes, harvest scenarios and extinction probability. 2. We used a 12-year photographic identification library of whale sharks from Ningaloo Reef, Western Australia to construct Cormack-Jolly-Seber (CJS) model estimates of survival within a capture-mark-recapture (CMR) framework. Estimated survival rates, population structure and assumptions regarding age at maturity, longevity and reproduction frequency were combined in a series of age-classified Leslie matrices to infer the potential trajectory of the population. 3. Using data from 111 individuals, there was evidence for time variation in apparent survival (phi) and recapture probability (p). The null model gave a phi of 0.825 (95% CI: 0.727-0.893) and p = 0.184 (95% CI: 0.121-0.271). The model-averaged annual phi ranged from 0.737 to 0.890. There was little evidence for a sex effect on survival. 4. Using standardized total length as a covariate in the CMR models indicated a size bias in phi. Ignoring the effects of time, a 5-m shark has a phi = 0.59 and a 9 m shark has phi = 0.81. 5. Of the 16 model combinations considered, 10 (63%) indicated a decreasing population (lambda < 1). For models based on age at first reproduction (alpha) of 13 years, the mean age of reproducing females at the stable age distribution (A) ranged from 15 to 23 years, which increased to 29-37 years when alpha was assumed to be 25. 6. All model scenarios had higher total elasticities for non-reproductive female survival [E(s(nr))] compared to those for reproductive female survival [E(s(r))]. 7. Assuming relatively slow, but biologically realistic, vital rates (alpha = 25 and biennial reproduction) and size-biased survival probabilities, our results suggest that the Ningaloo Reef population of whale sharks is declining, although more reproductive data are clearly needed to confirm this conclusion. Combining relatively precise survival estimates from CMR studies with realistic assumptions of other vital rates provides a useful heuristic framework for determining the vulnerability of large oceanic predators for which few direct data exist.

Twitter Demographics

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Mendeley readers

The data shown below were compiled from readership statistics for 223 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Australia 3 1%
India 2 <1%
United Kingdom 2 <1%
South Africa 2 <1%
Mexico 2 <1%
Portugal 2 <1%
Indonesia 1 <1%
Namibia 1 <1%
Mozambique 1 <1%
Other 12 5%
Unknown 195 87%

Demographic breakdown

Readers by professional status Count As %
Researcher 63 28%
Student > Ph. D. Student 44 20%
Student > Master 33 15%
Student > Bachelor 24 11%
Unspecified 14 6%
Other 45 20%
Readers by discipline Count As %
Agricultural and Biological Sciences 152 68%
Environmental Science 34 15%
Unspecified 24 11%
Medicine and Dentistry 3 1%
Earth and Planetary Sciences 2 <1%
Other 8 4%

Attention Score in Context

This research output has an Altmetric Attention Score of 18. 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 29 January 2014.
All research outputs
#753,083
of 12,353,464 outputs
Outputs from Journal of Animal Ecology
#248
of 1,776 outputs
Outputs of similar age
#9,627
of 142,032 outputs
Outputs of similar age from Journal of Animal Ecology
#2
of 4 outputs
Altmetric has tracked 12,353,464 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 93rd percentile: it's in the top 10% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 1,776 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 11.6. This one has done well, scoring higher than 86% of its peers.
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 142,032 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 93% of its contemporaries.
We're also able to compare this research output to 4 others from the same source and published within six weeks on either side of this one. This one has scored higher than 2 of them.