Wednesday, April 22, 2009
Sunday, April 19, 2009
Potential conservation impacts of high-altitude small mammals: a field study and literature review...Includes very good info on mice diet
Researchers Measure Extent of Mouse Menace: Landcare Research scientists investigate mouse abundance in the context of beech masting...press release
ERADICATING HOUSE MICE FROM ISLANDS: SUCCESSES, FAILURES AND THE WAY FORWARD....good references to check out further
Movement, diet, and relative abundance of stoats in an alpine habitat
Smith, Jamieson 2003 - suggests independent populations beech/alpine and stoat switch to weta from mice in event of mouse decline after mast cycle
Dispersal and survival of juvenile feral ferrets
Lancare Research scientists investigate the dispersal of young ferrets and provide some management recomendations...journal article
Saturday, April 4, 2009
Peter Gaze, a DOC Scientist in Nelson, plucked me an excerpt from "Consider the Birds - who they are and what they do" by Colin Tudge 2008. It begins to elucidate just how unique the tuke and its sister the titipounamu (or rifleman) are from an evolutionary perspective,
The New Zealand wrens, family Xenicidae should be treasured not simply as fine little birds but because of their unique evolutionary status. About 80 million years ago, so it seems, the world's first population of passerines split into two. One group evolved to become crows, shrikes, finches, swallows and all the rest - 6000 species of all shapes and way of life. All that remains of the other group is the New Zealand wrens."
Around 80 million years ago is about the same time that New Zealand (then a province of Antarctica) broke away from the great southern land "Gondwana". I only know this in detail because one of my current reads George Gibbs in "Ghosts of Gondwana" says so. Gibbs also notes the importance of the New Zealand wrens, here refered to as of the family Acanthisittidae...
A molecular study has revealed that our tiny acanthisittids possibly represent the closest surviving relict of the ancestral type of passerine bird
Now to be honest this doesn't really mean much to me at all, a layman in a bird mans world, but think of it this way. There are, or were, three endemic (only existing in New Zealand) vertebrate "orders", represented by the Moas, the Kiwis and the Tuatara. There are only nine endemic vertebrate families, these include our wattlebirds (eg kokako or saddleback), our family of frogs, and our special short-tailed bat of the family Mystacina. The frogs are an interesting comparison actually they have existed for a similar period of time to the wrens, have four existing species to the wrens two and three species already extinct to the wrens four.
We have 90 million years of history in our hands...