Tagged: nutrients

Why coral reefs wouldn’t be the same without big fish (and their pee) - Up and Atom

Kimberley Collins Aug 18, 2016

Scientists have known for decades that fish urine is important for coral reefs. Now, a new study has found urine excreted by large fish is critical to the survival and growth of these fragile ecosystems.  Like most living things, coral reefs need nutrients to grow. In coral reefs, fish provide these, holding the nutrients in their tissue and excreting them through their urine … Read More

Understanding the natural history of New Zealand’s nutrient fluxes - Waiology

Waiology Nov 06, 2014

By Emily Diack and Sarah Mager Water quality in New Zealand has been a hot topic of late, especially when it comes to the growing impact that agriculture and land use changes are having on our waterways. Maintaining good water quality is fundamental for sustaining our indigenous ecosystems, but how do we define what that ‘good’ level of water quality … Read More

How much dairying is too much in terms of water quality? - Waiology

Waiology Dec 17, 2013

By Daniel Collins On 21 November the Parliamentary Commissioner for the Environment, Jan Wright, released her second report on water quality. It warned that business-as-usual dairy expansion by 2020 would leave our lakes and rivers more degraded than they are now, even with improved mitigation. I’d now like to re-cap what the report concluded, how it got there, … Read More

Impacts of climate change on water quality - Waiology

Waiology Dec 16, 2013

By Daniel Collins Climate change goes beyond warmer weather and more extreme floods and droughts. Effects are expected to include changes to the water quality of our rivers and lakes as well. This has implications for the vulnerability and sensitivity of freshwater ecosystems, as well as water quality limit-setting and catchment nutrient management. These issues, and more, were discussed … Read More

How does agriculture affect New Zealand’s water quality? - Waiology

Waiology Dec 05, 2013

By Bob Wilcock About 40% of the land area of New Zealand is in some form of agriculture. Sheep and beef farming are the most extensive (33%) followed by dairy farming at 6%, and the remainder being horticulture and cropping. Based on a large number of comparative land use studies we have a good understanding of how agriculture affects … Read More