The long invasion

New Zealand has worried about invasion for the last 200 years. Dotted around our major harbours are gun emplacements built to repel Russian and Japanese imperial designs in the late nineteenth and mid twentieth century’s, respectively. Of course neither of these invasions eventuated but there have actually been enormous numbers…

BioBlitz Lincoln 2009: 1637 species in 24 hours!

On the 3–4 April 2009 hundreds of people gathered at the Liffey Stream in Lincoln to experience the chaos of exploration and discovery that is a BioBlitz. This 24 hour scientific race against time and educational event was held in conjunction with Lincoln Envirotown, Lincoln University and Landcare Research. The…

Reining in a bolting horse, kiwi(fruit) style

wild kiwifruit Originally uploaded by Mollivan Jon There are a lot of doom and gloom stories in plant biosecurity in New Zealand. There are now more naturalised vascular plant species than native species and the invasion has yet to slow, fueled by the large diversity of ornamental garden plants. New…

The effectiveness of the gorse seed weevil and gorse pod moth

Ulex europaeusOriginally uploaded by Mollivan Jon Gorse (Ulex europaeus) is a prickly shrub that is the number one weed in New Zealand. Due to the favourable climate in New Zealand, in a short time gorse was producing a lot of seeds to store in the seed banks. To combat this…

Gorse seed production and viability

Gorse (Ulex europaeus) produces many seeds per season which can be viable for a long period, especially if the seed is buried underground. In the more temperate climate areas gorse has two reproductive periods per season. Craig Sixtus, who was studying gorse for his master’s degree, investigated gorse seed viability…

Phenology of Cydia succedana

Most people know that gorse is a major prickly problem weed. Gorse (Ulex europaeus) was introduced to New Zealand as a stock food and hedge material. However, our climate suited it and in a lot of New Zealand there were two reproductive periods. In a short period there were a…

It helps to know the local lingo but don’t expect the natives to be friendly

native and naturalised senecios, side by sideOriginally uploaded by Mollivan Jon Charles Darwin first puzzled over whether native species would help or hinder the invasion of related exotic species. Do natives make it hard for related invading exotic species to get established? Distantly related invaders might have an advantage in…