scholarly journals Overfishing and nutrient pollution interact with temperature to disrupt coral reefs down to microbial scales

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Jesse R. Zaneveld ◽  
Deron E. Burkepile ◽  
Andrew A. Shantz ◽  
Catharine E. Pritchard ◽  
Ryan McMinds ◽  
...  
Keyword(s):  
Coral Reefs ◽  
Nutrient Pollution

scholarly journals Nutrient pollution disrupts key ecosystem functions on coral reefs

2018 ◽  
Vol 285 (1880) ◽  
pp. 20172718 ◽  
Author(s):  
Nyssa J. Silbiger ◽  
Craig E. Nelson ◽  
Kristina Remple ◽  
Jessica K. Sevilla ◽  
Zachary A. Quinlan ◽  
...  
Keyword(s):  
Coral Reefs ◽  
Nutrient Addition ◽  
Ecosystem Functions ◽  
Nutrient Pollution ◽  
Global Changes ◽  
Ambient Conditions ◽  
Net Community Production ◽  
Saturation State ◽  
Indirect Response ◽  
The Impact

There is a long history of examining the impacts of nutrient pollution and pH on coral reefs. However, little is known about how these two stressors interact and influence coral reef ecosystem functioning. Using a six-week nutrient addition experiment, we measured the impact of elevated nitrate (NO − 3 ) and phosphate (PO 3− 4 ) on net community calcification (NCC) and net community production (NCP) rates of individual taxa and combined reef communities. Our study had four major outcomes: (i) NCC rates declined in response to nutrient addition in all substrate types, (ii) the mixed community switched from net calcification to net dissolution under medium and high nutrient conditions, (iii) nutrients augmented pH variability through modified photosynthesis and respiration rates, and (iv) nutrients disrupted the relationship between NCC and aragonite saturation state documented in ambient conditions. These results indicate that the negative effect of NO − 3 and PO 3− 4 addition on reef calcification is likely both a direct physiological response to nutrients and also an indirect response to a shifting pH environment from altered NCP rates. Here, we show that nutrient pollution could make reefs more vulnerable to global changes associated with ocean acidification and accelerate the predicted shift from net accretion to net erosion.

Coral reefs in the modern world

2018 ◽  
Author(s):  
Charles R. C. Sheppard ◽  
Simon K. Davy ◽  
Graham M. Pilling ◽  
Nicholas A. J. Graham
Keyword(s):  
Climate Change ◽  
Coral Reefs ◽  
Industrial Pollution ◽  
Modern World ◽  
Nutrient Pollution ◽  
Sewage Pollution ◽  
Sea Temperature ◽  
Coral Diseases ◽  
Marine Systems ◽  
Limestone Rock

Today coral reefs, perhaps more than other marine systems, are suffering from numerous pressures. As a result, many have collapsed as functioning ecosystems. Nutrient pollution, sewage pollution, industrial pollution, landfill, coral diseases and diseases of other important groups of organisms, as well as over-extraction of fish, invertebrates and even the limestone rock itself, have all contributed to the demise of over one-third of the world’s reefs. More recently, climate change, notably causing a sea temperature rise, which in turn has led to coral bleaching and the death of component corals, has added to the stress imposed on this ecosystem. In the future, ocean acidification, sea level rise and an increase in the frequency and severity of storms will add further stress. Many of these factors interact, making the precise responses of reefs to these changes very complex.

Pemetaan Pulau Kecil Gelasa Kabupaten Bangka Tengah

2019 ◽  
Vol 2 (1) ◽  
pp. 11-14
Author(s):  
Wahyu Adi
Keyword(s):  
Coral Reefs ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Image Interpretation ◽  
Vegetation Coverage ◽  
Small Island ◽  
Shallow Waters ◽  
Small Islands ◽  
Seagrass Beds ◽  
Cover Density

Pulau Kecil Gelasa merupakan daerah yang belum banyak diteliti. Pemetaan ekosistem di pulau kecil dilakukan dengan bantuan citra Advanced Land Observing Satellite (ALOS). Penelitian terdahulu diketahui bahwa ALOS memiliki kemampuan memetakan terumbu karang dan padang lamun di perairan dangkal serta mampu memetakan kerapatan penutupan vegetasi. Metode interpretasi citra menggunakan alogaritma indeks vegetasi pada citra ALOS yaitu NDVI (Normalized Difference Vegetation Index), serta pendekatan Lyzengga untuk mengkoreksi kolom perairan. Hasil penelitian didapatkan luasan Padang Lamun di perairan dangkal 41,99 Ha, luasan Terumbu Karang 125,57 Ha. Hasil NDVI di daratan/ pulau kecil Gelasa untuk Vegetasi Rapat seluas 47,62 Ha; luasan penutupan Vegetasi Sedang 105,86 Ha; dan penutupan Vegetasi Jarang adalah 34,24 Ha.   Small Island Gelasa rarely studied. Mapping ecosystems on small islands with the image of Advanced Land Observing Satellite (ALOS). Previous research has found that ALOS has the ability to map coral reefs and seagrass beds in shallow water, and is able to map vegetation cover density. The method of image interpretation uses the vegetation index algorithm in the ALOS image, NDVI (Normalized Difference Vegetation Index), and the Lyzengga approach to correct the water column. The results of the study were obtained in the area of Seagrass Padang in the shallow waters of 41.99 ha, the area of coral reefs was 125.57 ha. NDVI results on land / small islands Gelasa for dense vegetation of 47.62 ha; area of Medium Vegetation coverage 105.86 Ha; and the coverage of Rare Vegetation is 34.24 Ha.

Nutrient pollution degrades microbialites in Lough Carra, an Irish marl lake

2019 ◽  
Vol 83 (3) ◽  
pp. 203-209 ◽  
Author(s):  
P Doddy ◽  
CM Roden ◽  
MP Gammell
Keyword(s):  
Nutrient Pollution ◽  
Marl Lake

Drivers of herbivory on coral reefs: species, habitat and management effects

2016 ◽  
Vol 554 ◽  
pp. 129-140 ◽  
Author(s):  
KL Nash ◽  
RA Abesamis ◽  
NAJ Graham ◽  
EC McClure ◽  
E Moland
Keyword(s):  
Coral Reefs ◽  
Management Effects
Sign in / Sign up

Export Citation Format

Share Document