Figures
Fig. 1 A) Map of source and recipient transplant sites across
the Mediterranean Sea. Colours indicate the source and direction of
transplants in Catalunya (blue), Mallorca (yellow and orange) and Cyprus
(red). B) Illustrated example of a transplant fragment, characterised by
an apical shoot and multiple vertical shoots. C) Daily temperature
anomalies experienced by P. oceanica transplants, with respect to
the maximum annual temperature recorded in the site of origin (averaged
between 1981-2019). Dashed vertical line, highlights switch between
positive (stress) and negative (recovery) thermal anomalies. Maximum
annual temperatures recorded in Catalunya = 25ºC, Mallorca = 29.1ºC and
Cyprus = 29.3ºC. Daily temperatures experienced by transplants relative
to their thermal regimes of origin in D) Catalunya, E) Mallorca and F)
Cyprus. Shaded areas represent daily temperatures above thermal regime
of origin. Different shades of blue, yellow, orange and red within D, E
and F, illustrate temperature profiles in the different recipient sites.
Grey line represents the long-term daily temperature, averaged between
1981-2019.
Fig. 2 Patterns of shoot length and nutritional quality of
seagrasses over time in response to herbivory. A) Effects of a selective
feeding event in August 2018 in Cyprus where herbivores selectively
overgrazed cool-edge transplants (marked by asterisk). B)
Carbon:Nitrogen ratios of P. oceanica leaves in the different
treatments throughout the course of the experiment. C:N ratios in
cool-cool plants (blue dashed line) were only measured in July 2018 and
April 2019. C) Differences in herbivory on cool-warm transplants,
compared to adjacent centre-warm and warm-warm transplants.
Fig. 3 Patterns of transplant survivorship (A) and transplant
shoot survival (B) over the course of the experiment. Transplant
fragment survival is represented as the proportion of transplants
remaining at the end of each growth period, relative to the expected
number of transplants (i.e. initial conditions minus fragments removed
for growth measurements). Shoot survivorship is the change in the number
of shoots per transplant, relative to initial conditions. Blue points
and lines represent the fragments from Catalunya (cool edge), orange
lines and points represent fragments from Mallorca (central) and red
represents fragments from Cyprus (warm edge).
Fig. 4 Thermal performance of Posidonia oceanicatransplants across the Mediterranean Sea. Rows represent performance
metrics of new leaf production (top), shoot elongation (middle) and
total leaf length (bottom). Columns represent temperature metrics of
absolute maximum temperature (left), maximum thermal stress anomaly
(middle) and a comparison between heat stress period (July-Oct 2018,
left, grey) and recovery periods (Nov – June 2019, white, right).
Points represent mean ± SE rates per treatment. Shape of point
illustrates the time-period measurements were recorded in. Colour of
point represents the different transplant treatments and procedural
controls as per previous Figures.