Early history[ edit ] Archaeological investigations indicate that Santa Cruz Island has been occupied for at least 10, years. It was known as Limuw place of the sea or Michumash in the Chumash language.
Mammals Colony of feral cats. The potential negative impact of feral cat populations on ecologically sensitive places has created perhaps the biggest bone of contention between the conservation movement and animal rights groups.
This issue is particularly critical on islands where feral cats have been implicated in the extinction of a number of native species.
Some animal rights proponents have promoted " trap, neuter, and return " programs as a potential humane solution to the problem. Under this approach, feral cats are trapped, sterilized, and then released back to local areas where volunteer "colony caretakers" provide periodic care.
One of the assumptions underlying the approach is that neutered cats will have smaller home ranges and will stick around the areas where they are being fed, which will keep them from preying on native wildlife in natural areas. However, a new study from Santa Catalina Island of the coast of California challenges this assumption and raises questions about the effectiveness of using sterilization programs alone.
Efforts to control feral cats on Santa Catalina include trap, neuter and return TNR programs at the two villages at the ends of the island. They captured feral cats using traps, neutered half the sample, and released both sterilized and non-sterilized individuals outfitted with GPS collars.
They found little difference in the home-ranges between sterilized and non-sterilized cats. Neutered and non-neutered individuals traveled long distances between human populated areas and the interior of the island which is comprise primarily of wildlands. They estimated the island-wide feral cat population at individuals and found trapability to be very low.
The authors write, "The influx of subsidized cats to natural habitats, combined with their high vagility and low trappability, makes TNR an unlikely solution for controlling feral cats on a large, rugged island like Catalina and, more generally, in other locations where human populations abut ecologically sensitive areas.
This is also problematic for the highly threatened Catalina Island foxwhich has little immunity from diseases brought from the mainland and nearly went extinct after an outbreak of canine distemper virus.
Scientists worry that feral cats on the island - in addition to putting the fox at risk to disease - may also compete with the foxes for food and displace them from their habitat. Based on their findings, the authors write, "Until resources are available to implement more proactive control measures in these areas, cats trapped in the island interior should be removed and delivered to a shelter; if they are deemed adoptable, cats should be sterilized and added to the adoption pool on the mainland.
If they are not adoptable or if there are insufficient resources to support relocation, they should be euthanized. Effects of sterilization on movements of feral cats at a wildland—urban interface Journal of Mammalogy, 91 2DOI:Mike Boulland, president of the Friends of Santa Teresa Park, recommended the County Parks look at the places where the pigs exit Santa Teresa Park and see about fencing those off.
Elizabeth Cord, from the Santa Teresa Citizen Action Group, recommended getting a small working committee together to address the problem. Abstract. Islands provide refuge for many rare and endemic species but are especially vulnerable to invasion by nonnative species.
Invasive alien species are a major factor in the imperilment and extinction of island biota. Biosecurity protocols are designed to prevent or quickly detect the transport of harmful nonnative species, with the goal of eliminating the high economic cost of invasive. Santa Cruz Island has been plagued by invasive species for decades, but conservation efforts are helping to restore the native ecosystem.
The Santa Cruz Island ecosystem encountered cattle, sheep, and pigs for the first time . Santa Cruz Councilman Tony Madrigal dismissed the brief as employing scare tactics.
“They’re proposing a choice to the people between bad and worse,” he said. In addition, the state has gone on the offensive against injury reports from the first round of pheromone spraying, which occurred last fall.
Feral herbivore removal from Santa Catalina Island, Channel Island National Park, led to an increase in native species richness, but also to large absolute and relative increases in cover by exotic annuals 29 x Trends in vegetation changes with removal of feral animal grazing pressures on Santa Catalina Island.
of island foxes, the nature of the canine distemper strain on Santa Catalina Island and the endemic distemper-like virus found naturally in island fox populations, chronic amyloidosis, ear tumors on Santa Catalina, and neonatal deaths from maternal neglect.