Limited nursery replenishment in coral reefs

27 03 2017
Haemulon sciurus

blue-striped grunt (Haemulon sciurus)

Coral reef fishes are wonderfully diverse in size, form, and function, as well as their need for different habitats throughout the life cycle. Some species spend all of their life in the same kind of coral habitat, while others need different places to breed and feed.

Fishes requiring different habitats as they progress through life often have what we call ‘nurseries’ in which adults lay eggs and the subsequent juveniles remain, and these places are often dominated by mangroves or seagrasses (i.e., they are not part of the coral reef).

While we’ve known for quite some time that when these nursery habitats are not around, adjacent coral reefs have few, if any, of these nursery-dependent species. What we haven’t known until now is just how far the influence of nurseries extends along a coral reef.

In other words, if a nursery is present, just how many new recruits do different areas of a reef receive from it? Read the rest of this entry »

We treat our wildlife like vermin

24 09 2014
Just a little of the dog fence's carnage and cruelty at work.

Just a little of the dog fence’s carnage and cruelty at work.

I’ve pointed out in several posts on just how badly Australia is doing in the environmental stakes, with massive deforestation continuing since colonial times, feral predators and herbivores blanketing the continent, inadequate protected areas, piss-weak policies and a government at war with its own environment. Despite a few recent wins in marine conservation, Australia has a dreadful track record.

Now in another monumental demonstration of stupidity, corruption and colonial-era attitudes toward native wildlife, Western Australia has outdone itself by sneaking through legislation to extend its so-called ‘Barrier Fence’ in an effort to isolate its marginal farmland from dingoes, emus and other ‘nuisance’ species.

As I and several others have pointed out before, the mere existence of the record-breaking dingo fence is not only counter-productive, it is expensive and utterly archaic. It should be torn down entirely.

Instead, the Western Australian government wants to extend the national fence, and they’ve approved the plan it without going through any of the appropriate checks in the system. Its environmental impacts have not been adequately assessed, nor has the public been given the opportunity to oppose the plans. In my view, the people responsible for this act should go to gaol.

In a recent paper led by Keith Bradby entitled Ecological connectivity or Barrier Fence? Critical choices on the agricultural margins of Western Australia, we show how the Western Australia state government has not followed any of its own environmental legislation and rushed through these idiotic proposals. If you do not subscribe to Ecological Management and Restoration, you can obtain a copy of the paper by e-mailing Keith or me. Read the rest of this entry »

To corridor, or not to corridor: size is the question

24 04 2012

I’ve just read a really interesting post by David Pannell from the University of Western Australia discussing the benefits (or lack thereof) of wildlife ‘corridors’. I’d like to elaborate on a few key issues, and introduce the most important aspect that really hasn’t been mentioned.

Some of you might be aware that the Australian Commonwealth Government has just released its Draft National Wildlife Corridors Plan for public comment, but many of you might not really know what a ‘corridor’ constitutes.

Wildlife or biodiversity ‘corridors’ have been around for a long time, at least in terms of proposals. The idea is fairly simple to conceive, but very difficult to implement in practice.

At least for as long as I’ve been in the conservation biology biz, ‘corridors’ have been proffered as one really good way to make broad-scale landscape restoration plausible and effective for (mainly) forest-dwelling species which have copped the worst of deforestation trends around Australia and the world. The idea is that because of intense habitat fragmentation, isolated patches of primary (or at least, reasonably intact secondary) forest can be linked by planting some sort of long corridor of similar habitat between them. Then, all the little creatures can merrily make their way back and forth between the patches, thus rescuing each other from extinction via migration. Read the rest of this entry »