scholarly journals Deep and abyssal ocean warming from 35 years of repeat hydrography

2016 ◽  
Vol 43 (19) ◽  
pp. 10,356-10,365 ◽  
Author(s):  
Damien G. Desbruyères ◽  
Sarah G. Purkey ◽  
Elaine L. McDonagh ◽  
Gregory C. Johnson ◽  
Brian A. King
Keyword(s):  
Ocean Warming ◽  
Repeat Hydrography

Report of the International Repeat Hydrography Workshop

PAGES news ◽  
2005 ◽  
Vol 13 (3) ◽  
pp. 28-28
Author(s):  
Howard Cattle
Keyword(s):  
Repeat Hydrography

scholarly journals Vegetative Reproduction Is More Advantageous Than Sexual Reproduction in a Canopy-Forming Clonal Macroalga under Ocean Warming Accompanied by Oligotrophication and Intensive Herbivory

Plants ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1522
Author(s):  
Hikaru Endo ◽  
Toru Sugie ◽  
Yukiko Yonemori ◽  
Yuki Nishikido ◽  
Hikari Moriyama ◽  
...  
Keyword(s):  
Growth Rate ◽  
High Temperature ◽  
Nutrient Availability ◽  
Vegetative Reproduction ◽  
Ocean Warming ◽  
Regeneration Ability ◽  
Combined Effects ◽  
Regeneration Rate ◽  
Fish Herbivory ◽  
C 30

Ocean warming and the associated changes in fish herbivory have caused polarward distributional shifts in the majority of canopy-forming macroalgae that are dominant in temperate Japan, but have little effect on the alga Sargassum fusiforme. The regeneration ability of new shoots from holdfasts in this species may be advantageous in highly grazed environments. However, little is known about the factors regulating this in Sargassum species. Moreover, holdfast tolerance to high-temperature and nutrient-poor conditions during summer has rarely been evaluated. In the present study, S. fusiforme holdfast responses to the combined effects of temperature and nutrient availability were compared to those of sexually reproduced propagules. The combined effects of holdfast fragmentation and irradiance on regeneration were also evaluated. Propagule growth rate values changed from positive to negative under the combination of elevated temperature (20 °C–30 °C) and reduced nutrient availability, whereas holdfasts exhibited a positive growth rate even at 32 °C in nutrient-poor conditions. The regeneration rate increased with holdfast fragmentation (1 mm segments), but was unaffected by decreased irradiance. These results suggest that S. fusiforme holdfasts have a higher tolerance to high-temperature and nutrient-poor conditions during summer than propagules, and regenerate new shoots even if 1-mm segments remain in shaded refuges for fish herbivory avoidance.

Ocean warming and freshening effects on lipid metabolism in coastal Antarctic phytoplankton assemblages dominated by sub-Antarctic species

2021 ◽  
pp. 147879
Author(s):  
J.C. Antacli ◽  
M.P. Hernando ◽  
M. De Troch ◽  
G. Malanga ◽  
M. Mendiolar ◽  
...  
Keyword(s):  
Lipid Metabolism ◽  
Ocean Warming ◽  
Phytoplankton Assemblages ◽  
Antarctic Species

scholarly journals Effects of thermal conditioning on the performance of Pocillopora acuta adult coral colonies and their offspring

Coral Reefs ◽  
2021 ◽  
Author(s):  
Crystal J. McRae ◽  
Wen-Bin Huang ◽  
Tung-Yung Fan ◽  
Isabelle M. Côté
Keyword(s):  
Nuclear Power ◽  
Direct Evidence ◽  
Lunar Cycle ◽  
Ocean Warming ◽  
Active Management ◽  
Management Approach ◽  
Offspring Performance ◽  
Lower Maximum ◽  
Management Techniques ◽  
Reproductive Cycles

AbstractOcean warming induced by climate change is the greatest threat to the persistence of coral reefs globally. Given the current rate of ocean warming, there may not be sufficient time for natural acclimation or adaptation by corals. This urgency has led to the exploration of active management techniques aimed at enhancing thermal tolerance in corals. Here, we test the capacity for transgenerational acclimation in the reef-building coral Pocillopora acuta as a means of increasing offspring performance in warmer waters. We exposed coral colonies from a reef influenced by intermittent upwelling and constant warm-water effluent from a nuclear power plant to temperatures that matched (26 °C) or exceeded (29.5 °C) season-specific mean temperatures for three reproductive cycles; offspring were allowed to settle and grow at both temperatures. Heated colonies reproduced significantly earlier in the lunar cycle and produced fewer and smaller planulae. Recruitment was lower at the heated recruitment temperature regardless of parent treatment. Recruit survival did not differ based on parent or recruitment temperature. Recruits from heated parents were smaller and had lower maximum quantum yield (Fv/Fm), a measurement of symbiont photochemical performance. We found no direct evidence that thermal conditioning of adult P. acuta corals improves offspring performance in warmer water; however, chronic exposure of parent colonies to warmer temperatures at the source reef site may have limited transgenerational acclimation capacity. The extent to which coral response to this active management approach might vary across species and sites remains unclear and merits further investigation.

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