Study shows how 1.5DEGC temperature rise can cause significant changes
in coastal species

Date:
November 1, 2021
Source:
University of Plymouth
Summary:
As COP26 leaders gather in the UK, new research shows a temperature
increase of around 1.5DEGC -- just under the maximum target agreed
at the COP23 Paris meeting in 2017 -- can have a marked impact on
algae and animal species living on our coastlines.



FULL STORY ==========================================================================
A temperature increase of around 1.5DEGC -- just under the maximum target agreed at the COP23 Paris meeting in 2017 -- can have a marked impact on
algae and animal species living on UK coastlines, new research has found.


==========================================================================
The study, by ecologists at the University of Plymouth, examined how
increases in rock surface temperature were affecting the quantity
and behaviour of species commonly found on the shorelines of Devon
and Cornwall.

It focused on two sites on the region's north coast (at Bude and Croyde)
and two on the south coast (Bantham and South Milton Sands), all of
which have deep gullies with both north-facing and south-facing surfaces.

Their findings showed the average annual temperature on the south-facing surfaces at low tide was 1.6DEGC higher than those facing north and that temperature extremes (i.e. > 30DEGC) were six-fold more frequent on south- facing aspects.

Across the four sites, these differences had a significant effect on
species abundance with 45 different species found on north-facing sites
during the summer of 2018 compared to 30 on south-facing ones.

In winter, the figures were 42 and 24 respectively, while some species
- - including the red seaweed Plumaria plumosa and sea cauliflower
(Leathesia marina) -- were restricted to north-facing surfaces.



==========================================================================
The different temperatures also had an impact on species' breeding
patterns with five times more dog whelk (Nucella lapillus) eggs found
on north-facing surfaces than south-facing ones.

And while limpet reproduction generally occurred earlier on south-facing surfaces, these key grazers also exhibited greater levels of stress.

The research, published in Marine Environmental Research, is the first
to explore the association between temperature and site geography on
species abundance, physiology and reproductive behaviour in coastal areas.

Its authors say it provides evidence of how temperature variation at
local scales can affect species while also offering an insight as to how
future changes in global temperatures might have a negative impact over
the coming decades.

The research was led by Dr Axelle Amstutz as part of her PhD, working
alongside Associate Professor of Marine Ecology Dr Louise Firth, Professor
of Marine Zoology John Spicer, and Associate Professor in Plant-Animal Interactions Dr Mick Hanley.

Dr Hanley, the study's senior author, said: "We have all heard for
some time about the importance of limiting average global temperature
increases to 1.5DEGC, and it will undoubtedly be one of the key topics discussed at the forthcoming COP26 conference. This study shows the
impact even that kind of increase could have on important species that contribute to the health and biodiversity of our planet. As such, it
does add to overwhelming evidence of the threats posed by human-induced
climate change.

"However, more than that, it shows how the pressure on different
species can change even within individual locations. For example,
we recorded a temperature of 42.5DEGC on a south-facing surface at
Croyde at the same time as 22.5DEGC was measured on the opposite
north-facing side. We believe this shows such sites can be used
as a 'natural laboratory' to inform and predict how species and
habitats might respond to climate change over the coming decades." ========================================================================== Story Source: Materials provided by University_of_Plymouth. Note:
Content may be edited for style and length.


========================================================================== Journal Reference:
1. A. Amstutz, L.B. Firth, J.I. Spicer, M.E. Hanley. Facing up
to climate
change: Community composition varies with aspect and surface
temperature in the rocky intertidal. Marine Environmental Research,
2021; 172: 105482 DOI: 10.1016/j.marenvres.2021.105482 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2021/11/211101141753.htm

--- up 8 weeks, 4 days, 8 hours, 25 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (1:317/3)