scholarly journals Diverse mechanisms for photoprotection in photosynthesis. Dynamic regulation of photosystem II excitation in response to rapid environmental change

2015 ◽  
Vol 1847 (4-5) ◽  
pp. 468-485 ◽  
Author(s):  
Allen Derks ◽  
Kristin Schaven ◽  
Doug Bruce
Keyword(s):  
Photosystem Ii ◽  
Environmental Change ◽  
Dynamic Regulation ◽  
Rapid Environmental Change

Dynamic regulation of partner abundance mediates response of reef coral symbioses to environmental change

Ecology ◽  
2015 ◽  
Vol 96 (5) ◽  
pp. 1411-1420 ◽  
Author(s):  
R. Cunning ◽  
N. Vaughan ◽  
P. Gillette ◽  
T. R. Capo ◽  
J. L. Maté ◽  
...  
Keyword(s):  
Environmental Change ◽  
Reef Coral ◽  
Dynamic Regulation

Environmental change provokes rapid macromolecular reallocations within the photosynthetic system in a static population of photobionts in the lichen Lobaria pulmonaria

2004 ◽  
Vol 36 (6) ◽  
pp. 425-433 ◽  
Author(s):  
Tyler D. B. MACKENZIE ◽  
Jeanette JOHNSON ◽  
Douglas A. CAMPBELL
Keyword(s):  
Photosystem Ii ◽  
Environmental Change ◽  
Seasonal Changes ◽  
Core Protein ◽  
Temperature Shift ◽  
High Light ◽  
Eastern Canada ◽  
Epiphytic Lichen ◽  
Lobaria Pulmonaria ◽  
Photosynthetic System

Lobaria pulmonaria is an epiphytic lichen that, in south-eastern Canada, inhabits deciduous forests where it must acclimate to large seasonal changes in temperature and in light caused by closing and opening of the leaf canopy. On a seasonal timescale, this acclimation occurs via large shifts in the macromolecular complexes of the photosynthetic system, within a photobiont population that shows no seasonal change in cell numbers. In this study, samples of L. pulmonaria were harvested in February and in May from a natural population near Sackville, New Brunswick, and subjected to two simulated intense seasonal changes: (1) early spring warming, simulated by a shift from high light at 5°C to high light at 16°C (February shift), and (2) late spring canopy closure, simulated by a shift from high light at 16°C to low light at 16°C (May shift). Thallus samples were collected daily throughout each week-long shift. There were no significant changes in photobiont cell population size or in the fraction of cells dividing during either shift. During the first day of the February temperature shift, there were, however, large changes in the pools of chlorophyll, the major light capture molecule in the photobionts, the PsbA (D1) core protein of photosystem II whose turnover is highly responsive to changing light and temperature, and the RbcL major subunit of the carbon-fixing RUBISCO enzyme whose levels correlate strongly with achieved photosynthesis in lichens. A static population of photobionts was therefore able to perform large and rapid macromolecular reallocations to cope with rapid environmental change. No significant changes were seen in the chlorophyll, photosystem II or RUBISCO pools across the May light shift, although seasonal-scale macromolecular reallocation does occur in response to decreased light in the summer.

scholarly journals Understanding interactions between plasticity, adaptation and range shifts in response to marine environmental change

2019 ◽  
Vol 374 (1768) ◽  
pp. 20180186 ◽  
Author(s):  
Jennifer M. Donelson ◽  
Jennifer M. Sunday ◽  
Will F. Figueira ◽  
Juan Diego Gaitán-Espitia ◽  
Alistair J. Hobday ◽  
...  
Keyword(s):  
Climate Change ◽  
Environmental Change ◽  
Conceptual Model ◽  
Single Species ◽  
Marine Species ◽  
Range Shifts ◽  
Supporting Evidence ◽  
Marine Environmental ◽  
Rapid Environmental Change

Climate change is leading to shifts in species geographical distributions, but populations are also probably adapting to environmental change at different rates across their range. Owing to a lack of natural and empirical data on the influence of phenotypic adaptation on range shifts of marine species, we provide a general conceptual model for understanding population responses to climate change that incorporates plasticity and adaptation to environmental change in marine ecosystems. We use this conceptual model to help inform where within the geographical range each mechanism will probably operate most strongly and explore the supporting evidence in species. We then expand the discussion from a single-species perspective to community-level responses and use the conceptual model to visualize and guide research into the important yet poorly understood processes of plasticity and adaptation.This article is part of the theme issue ‘The role of plasticity in phenotypic adaptation to rapid environmental change’.

A Sea Country Learning Partnership in Times of Anthropocenic Risk: Offshore Coral Reef Education and Our Story of Practice

2017 ◽  
Vol 33 (3) ◽  
pp. 160-170 ◽  
Author(s):  
Hilary Whitehouse ◽  
Marie Taylor ◽  
Neus (Snowy) Evans ◽  
Tanya Doyle ◽  
Juanita Sellwood ◽  
...  
Keyword(s):  
Climate Change ◽  
Coral Reef ◽  
Environmental Change ◽  
Great Barrier Reef ◽  
Coral Bleaching ◽  
Educational Experiences ◽  
Barrier Reef ◽  
Local Schools ◽  
Rapid Environmental Change ◽  
Civic Environmentalism

AbstractThis is a researched account of an offshore coral reef education partnership formed during a time of rapid environmental change (the coral bleaching events in the years 2015 to 2017). The aim of the partnership is to encourage a learning connection with Sea Country. Framed as civic environmentalism, this article explores the dimensions of practice between a reef tourism provider, local schools, a local university, and local Indigenous rangers that enables primary, secondary and university students, rangers, and educators to travel together on day trips to the outer Great Barrier Reef and islands and have immersive and sharing educational experiences. Offshore environmental education and higher quality marine education is increasingly important in the Anthropocene, when Australian reefs are subject to the pressures of climate change and other impacts other impacts that diminish their resilience.

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