Boxplots from the SIAR mixing model showing the relative dietary contributions of potential prey sources (Groups 1-4) to the diet of sub-adult and adult bull sharks.

<p>Groups 1 and 2 were combined for the analysis due to similar stable isotopic signatures between these groups. The dietary proportions indicate the credibility intervals at 25, 75 and 95%.</p

A dual isotope plot representing the sampled fish community and individual bull sharks.

<p>Fish groups represented by the mean δ¹³C and δ¹⁵N values (±SD). Adult individual bull sharks are represented by squares and sub-adults are represented by triangles. </p

The study site is located in the southwest Indian Ocean off the coast of southern Mozambique within the Ponta do Ouro Partial Marine Reserve.

<p>The study site is located in the southwest Indian Ocean off the coast of southern Mozambique within the Ponta do Ouro Partial Marine Reserve.</p

A dual isotope plot representing the niche widths of adult (black line) and sub-adult (red line) bull sharks.

<p>Calculated niche width is represented by the small sample size corrected ellipses (solid lines) and displayed in a δ¹³C-δ¹⁵N niche space. </p

A dual isotope plot representing the niche widths of bull sharks (black line), fish group 1 (red line) and fish group 2 (green line).

<p>Calculated niche width is represented by the small sample size corrected ellipses (solid lines) and displayed in a δ¹³C-δ¹⁵N niche space. </p

Bull shark migration events along the coast of Mozambique.

<p>The x-axis represents a time line showing months and year. The y-axis shows distance along the coast in kilometers (starting at Ponta do Ouro) corresponding with the coastal map of southern Mozambique. The solid square markings show annual bull shark detection events at the study site and other locations within Mozambique.</p

Mean monthly residency indices and mean monthly sea temperature.

<p>Bar charts represent the mean monthly residency indices from all tagged bull sharks detected at the Pinnacle reef. Error bars representing standard deviation. The dashed line represents the mean monthly sea temperatures (°C) recorded at the study site.</p

Circular plots showing the temporal detection distribution of bull sharks at the Pinnacle reef.

<p>Each plot represents the detection frequency within each hour of a 24-hour period. The temporal distribution of most sharks (except 15 and 18) was significantly non-homogenous (Rao's spacing test, p<0.01). Individual sharks not represented had insufficient data for the analysis.</p

Multivariate ENSO index (MEI) data 1950 to 2010 (Wolter and Timlin 2011 and NOAA).

<p>Data sourced from <a href="http://www.noaa.com" target="_blank">www.noaa.com</a>.</p

Interannual variability in the mean number of male and female shark sightings per trip at the inshore site in Gansbaai, 2007 to 2011.

<p>Interannual variability in the mean number of male and female shark sightings per trip at the inshore site in Gansbaai, 2007 to 2011.</p