Porcupine! is back!

A brand new Porcupine! is out now! Thanks to the efforts of contributors, we have gathered 11 articles in our very first reintroductory issue … enjoy the content!

Download the newest Porcupine! here: Porcupine! No. 35 pdf version

Cover story:
Porcupine!-the early years — G.T. Reels

Porcupine! is coming back! — Tommy Hui

Stinging news! — Christophe Barthélémy
Polymorphism and populations: Cleora injectaria (Walker, 1860) (Lepidoptera: Geometridae) at Mai Po Nature Reserve, Hong Kong — Roger C. Kendrick

A rapid forest bird survey in southern Guangdong — Captain L.C. Wong, Matthew L.H . Kwan and Ching Yuen Ho
Wetland Restoration Area at Wo Shang Wai. The first private man-made wetland in Hong Kong — Captain L.C. Wong

Wildlife window:
A blue Changeable Lizard on a concrete path — Tommy Hui
Cobra vs cobra — Wenda Cheng

Pitfall traps:
Know your data and your tests: lessons from the misuse of Kruskal-Wallis test — Tommy Hui
Outliers and influential observations – what is the difference and their effects on regression model? — Toby P.N. Tsang

E&B news:
Passing on the knowledge: a herpetology course for undergraduate students by postgraduates — Edward Lau

Porc art:
Ivory — Nicole Kit


Outliers and influential observations – what is the difference and their effects on regression model?

by Toby P.N. Tsang


Outliers are commonly found in all ecological datasets. Even the presence of one outlier can seriously affect the result of statistical analyses and hence our inferences. Given the wide application of regression analyses in ecological research, this article will discuss ways to identify outliers in regression analyses Continue reading

Porcupine! ̶ the early years

by G.T. Reels

The late 1980s and early 1990s was an exciting period for the study of ecology in Hong Kong, particularly at Hong Kong University. A core of ecologically-minded academics in the Zoology and Botany Departments (principally David Dudgeon, Brian Morton, Richard Corlett and Gray Williams) was supervising a fast-expanding body of postgraduate students, recruited locally and from overseas, and an informal ‘Ecology Research Group’ had been formed across the two departments. Continue reading

Know your data and your tests: lessons from the misuse of Kruskal-Wallis test

by Tommy Hui

Kruskal-Wallis test as a routine?

In introductory biometrics classes, we were often told that before applying general linear model techniques such as analysis of variance (ANOVA) or regression analysis, we should fulfill a set of assumptions regarding the distribution of data.  Continue reading

Passing on the knowledge: a herpetology course for undergraduate students by postgraduates

Group photo at the Tai Mo Shan field trip

by Edward Lau

Inspired by Dr. Billy Hau who eagerly organizes a lot of non-credit bearing courses for undergraduate students and Dr. Nancy Karraker who used to hold a formal herpetology course for the Ecology & Biodiversity major/ minor, a non-credit bearing herpetology course was put together this summer to promote the study of herpetology, enrich students’ knowledge in herpetofauna and provide them with some hands-on field experiences.  Continue reading