http://www.arkinthepark.org.nz/maps/maps_and_graphs/ en Sat, 12 Jun 2010 17:44:50 +1200 http://blogs.law.harvard.edu/tech/rss Sandvox Pro 1.6.6 (12244) http://www.arkinthepark.org.nz/_Media/logo_for_aip-3.jpeg http://www.arkinthepark.org.nz/maps/maps_and_graphs/ 700 880 http://www.arkinthepark.org.nz/maps/maps_and_graphs/mustelid_trap_catch_2008-20.html <div class="article-thumbnail"> <img src="http://www.arkinthepark.org.nz/_Media/mustelid_trap_map-9.jpeg" alt="Mustelid trap catch 2008-2009" width="128" height="93" /> </div> <div><p style="text-align: left;">Numbers are down this year (67 stoats, 5 weasels, 5 ferrets). Again the majority are around the periphery of the forest, as the golf course is an internal open space (with a thriving population of rabbits to attract mustelids). </p> <p style="text-align: left;">For the first time there were no mustelids in the central lower Andersons Track area, but unfortunately a cluster of five can be seen in another internal area nearby ie the lower part of the Upper Kauri track. The importance of multiple traps is clear, if animals that travel so fast and so far are to be adjacent to a trap when they pause.</p> </div> Thu, 13 Aug 2009 16:51:38 +1200 http://www.arkinthepark.org.nz/maps/maps_and_graphs/mustelid_trap_catch_2008-20.html http://www.arkinthepark.org.nz/maps/maps_and_graphs/stoat_catch_by_month_2004-2.html <div class="article-thumbnail"> <img src="http://www.arkinthepark.org.nz/_Media/stoat_graph-14.jpeg" alt="Stoat catch by month 2004-2008" width="128" height="91" /> </div> <div><p style="text-align: left;">The parameter shown is catch per trap - the number of traps has risen steadily throughout the period, so catch per trap corrects for the effect of this increase on actual numbers caught. </p> <p style="text-align: left;">There is a consistent increase in numbers in mid-summer, when the female stoats come off their nests with their brood of around eight offspring. In two years (04-05 and 06-07) this produced a very large peak in December/January, but in the other two years there was a much less marked increase, spread evenly from December to February. It is not clear why there was this change in pattern - in 05-06 there was a bigger catch in the preceding Autumn, which could explain lower breeding in Spring, however 04-05 and 06-07 had similar patterns for most of the year but very different results in December/January.</p> <p style="text-align: left;">Traps are checked and re-baited less often in winter and more often in summer - for most of them the frequency is two-weekly and weekly, respectively. The bait used for most is rabbit meat, with a cracked egg as well (especially important in summer, when meat rapidly deteriorates), but for some a rabbit paste is used.</p> <p style="text-align: left;">All traps used are kill-traps, either Fenns or DOC 200's.</p> </div> Sun, 05 Oct 2008 11:07:43 +1300 http://www.arkinthepark.org.nz/maps/maps_and_graphs/stoat_catch_by_month_2004-2.html http://www.arkinthepark.org.nz/maps/maps_and_graphs/owned_bait_lines.html <div class="article-thumbnail"> <img src="http://www.arkinthepark.org.nz/_Media/owned_lines-14.jpeg" alt=""Owned" bait lines" width="128" height="91" /> </div> <div><p style="text-align: left;">Some volunteers have taken on responsibility for the maintenance and baiting of particular lines for at least one year. Having these lines pre-allocated (&quot;owned&quot;) assists the organisation of each baiting cycle.</p> <p style="text-align: left;"><span style="color: rgb(0, 0, 0); text-align: center; white-space: normal;">(Click on magnifying glass icon above to see an enlarged view)</span><br /> </p> </div> Wed, 01 Oct 2008 14:05:58 +1300 http://www.arkinthepark.org.nz/maps/maps_and_graphs/owned_bait_lines.html http://www.arkinthepark.org.nz/maps/maps_and_graphs/non-mustelid_catch_2007-200.html <div class="article-thumbnail"> <img src="http://www.arkinthepark.org.nz/_Media/non_mustelid_catch_0708-2.jpeg" alt="Non-mustelid catch 2007-2008" width="128" height="91" /> </div> <div><p style="text-align: left;">This shows other species of predators that were caught in the mustelid traps. The distribution is very similar to the mustelid catches, and probably for the same reasons - peripheral invasion from the surrounding non-controlled area, and from the golf course into the central valley (the four rats in this area were all caught in Autumn, 4-5 months after the last baiting cycle).</p> <p style="text-align: left;"><span style="color: rgb(0, 0, 0); text-align: center; white-space: normal;">(Click on magnifying glass icon above to see an enlarged view)</span><br /> </p> </div> Tue, 30 Sep 2008 13:07:48 +1300 http://www.arkinthepark.org.nz/maps/maps_and_graphs/non-mustelid_catch_2007-200.html http://www.arkinthepark.org.nz/maps/maps_and_graphs/mustelid_trap_catch_2007-20.html <div class="article-thumbnail"> <img src="http://www.arkinthepark.org.nz/_Media/stoat_catch_map_07_08-2.jpeg" alt="Mustelid trap catch 2007-2008" width="128" height="91" /> </div> <div><p style="text-align: left;">A similar pattern to the previous 12 months results is shown here - the majority of catches are made by the cordon of traps on the boundary, but the central area abutting the golf course is also active.</p> <p style="text-align: left;"><span style="color: rgb(0, 0, 0); text-align: center; white-space: normal;">(Click on magnifying glass icon above to see an enlarged view)</span><br /> </p> </div> Tue, 30 Sep 2008 12:59:30 +1300 http://www.arkinthepark.org.nz/maps/maps_and_graphs/mustelid_trap_catch_2007-20.html http://www.arkinthepark.org.nz/maps/maps_and_graphs/mustelid_trap_catch_2006-20.html <div class="article-thumbnail"> <img src="http://www.arkinthepark.org.nz/_Media/06_07_mustelid_catch_map-2.jpeg" alt="Mustelid trap catch 2006-2007" width="128" height="91" /> </div> <div><p style="text-align: left;">The majority of catches are found on the periphery of the Ark, but there is also a significant cluster in the central area around the Auckland City Walk. Stoats can move large distances in a day, and it is likely that these ones came via the golf course, attracted by the population of rabbits there.</p> <p style="text-align: left;"><span style="color: rgb(0, 0, 0); text-align: center; white-space: normal;">(Click on magnifying glass icon above to see an enlarged view)</span><br /> </p> </div> Tue, 30 Sep 2008 12:55:39 +1300 http://www.arkinthepark.org.nz/maps/maps_and_graphs/mustelid_trap_catch_2006-20.html http://www.arkinthepark.org.nz/maps/maps_and_graphs/monitoring_results_outside_.html <div class="article-thumbnail"> <img src="http://www.arkinthepark.org.nz/_Media/monitoring_graph_uncontro-2.jpeg" alt="Monitoring results outside the Ark" width="128" height="64" /> </div> <div><p style="text-align: left;">The comparison between this and the results from within the Ark is striking confirmation of the effectiveness of the rodent control. Some of the variability shown above does not have an obvious explanation, but some can be explained in terms of the normal cycle of rat populations, where there is a large decrease in numbers during the winter, and a steady build up during the summer to a peak in late summer and autumn.</p> <p style="text-align: left;"><span style="color: rgb(0, 0, 0); text-align: center; white-space: normal;">(Click on magnifying glass icon above to see an enlarged view)</span><br /> </p> </div> Tue, 30 Sep 2008 10:44:17 +1300 http://www.arkinthepark.org.nz/maps/maps_and_graphs/monitoring_results_outside_.html http://www.arkinthepark.org.nz/maps/maps_and_graphs/monitoring_results_within_t.html <div class="article-thumbnail"> <img src="http://www.arkinthepark.org.nz/_Media/monitoring_graph_control-10.jpeg" alt="Monitoring results within the Ark" width="128" height="91" /> </div> <div><p style="text-align: left;">Predator control started early in 2003. The reduction in rat numbers has been spectacular - since 2007 the usual result of monitoring is to find just one visited tunnel out of the 100 placed throughout the Ark. </p> <p style="text-align: left;">The initial increase in mouse numbers was attributed to them flourishing in the absence of rats, but since 2006 their numbers have also dropped sharply - this was unexpected, but has been sustained and it now seems clear that the combination of broudifacoum and a 100m by 50m grid of bait stations is sufficient to significantly reduce mouse numbers. Click the forward arrow above to compare with the results of monitoring outside the Ark.</p> <p style="text-align: left;"><span style="color: rgb(0, 0, 0); text-align: center; white-space: normal;">(Click on magnifying glass icon above to see an enlarged view)</span><br /> </p> </div> Tue, 30 Sep 2008 10:37:43 +1300 http://www.arkinthepark.org.nz/maps/maps_and_graphs/monitoring_results_within_t.html rodent controlmonitoring http://www.arkinthepark.org.nz/maps/maps_and_graphs/rodent_monitoring_lines.html <div class="article-thumbnail"> <img src="http://www.arkinthepark.org.nz/_Media/monitoring_lines-14.jpeg" alt="Rodent monitoring lines" width="128" height="91" /> </div> <div><p style="text-align: left;">The effectiveness of rodent control is measured at intervals of around two months, from soon after baiting starts through to late summer. Tunnels with a peanut butter bait in the centre are placed in the localities shown above. Ink is applied to pads next to the bait, and as the rodent exits its footprints are picked up on blotting paper pieces that it has to cross.</p> <p style="text-align: left;">A total of 100 tunnels are in place, in random positions, so that a variety of habitats are sampled. These are compared with 30 tunnels at three locations outside the Ark.</p> <p style="text-align: left;">The protocol is to set the baits and papers on a day when there is little rain, and the papers are collected next day. Typically the incidence of rat footprints is around 2-5% in the Ark, and 50%+ outside.</p> <p style="text-align: left;"><span style="color: rgb(0, 0, 0); font-family: Verdana; font-style: normal; font-weight: normal; text-align: center; white-space: normal;">(Click on magnifying glass icon above to see an enlarged view)</span><br /> </p> </div> Wed, 17 Sep 2008 16:58:36 +1200 http://www.arkinthepark.org.nz/maps/maps_and_graphs/rodent_monitoring_lines.html rodent controlmonitoringeffectiveness http://www.arkinthepark.org.nz/maps/maps_and_graphs/baiting_progress_2008.html <div class="article-thumbnail"> <img src="http://www.arkinthepark.org.nz/_Media/baiting_progress-4.jpeg" alt="Baiting progress: Autumn 2010" width="128" height="92" /> </div> <div><p style="font: 12.0px Helvetica;"><span style="font-family: Verdana; font-size: 15px;"></span></p> <p style="text-align: left;"><span><span style="background-color: transparent; color: black;">Three cycles of baiting are carried out each year, with the first one being in late winter. Within two months a second one is done, which is only partial, as many bait stations still have adequate quantities of bait left from the initial baiting. In early summer a third baiting is done of just the first 150 metres of bait stations on the lines that are on the periphery of the Ark. </span></span></p> <p style="text-align: left;">Autumn 2010 sees a change from this cycle. Concern at the possible spread of the PTA disease which affects kauri roots has lead to a decision to replace the late winter initial baiting with an earlier autumn one, when soil conditions are dry and less conducive to spread of the disease on volunteers' boots. </p> <p style="text-align: left;">The above map shows progress so far with this baiting.</p> <p style="text-align: left;">(Click on magnifying glass icon above to see an enlarged view)<br /> </p> <p> </p> </div> Sun, 03 Aug 2008 11:56:34 +1200 http://www.arkinthepark.org.nz/maps/maps_and_graphs/baiting_progress_2008.html http://www.arkinthepark.org.nz/maps/maps_and_graphs/predator_control.html <div class="article-thumbnail"> <img src="http://www.arkinthepark.org.nz/_Media/predator_map-8.jpeg" alt="Predator control" width="128" height="92" /> </div> <div><p style="text-align: left;">This shows the grid of bait lines, running in straight lines 100m apart, and with bait stations every 50m. The white squares show the location of stoat traps, all of which are kill-traps (currently 218 are being maintained, two weekly all year, and for some weekly at the time of peak stoat activity November to March).</p> <p style="text-align: left;"><span style="color: rgb(0, 0, 0); text-align: center; white-space: normal;">(Click on magnifying glass icon above to see an enlarged view)</span><br /> </p> </div> Tue, 22 Apr 2008 13:33:53 +1200 http://www.arkinthepark.org.nz/maps/maps_and_graphs/predator_control.html