Monday, September 18, 2017

Wildfire Can Threaten Island Foxes


Responding to wildfire on the Channel Islands raises a quandary, because there are positive and negative aspects to letting wildfire burn:
  • Fire is a natural element on the Channel Islands. Many native plants depend on fire to open up areas for new growth, to renew the soil, or even jump-start seeds. As omnivores, island foxes depend on diverse and healthy native plants.
  • Fire can provide unexpected abundance for predatory or scavenging animals, including island foxes. Smaller animals may get caught in the fire, while birds and larger animals might escape.
  • Years of drought, however, have created areas with exceptionally dry vegetation and greater than usual build-up of wildfire fuel.
  • Land animals, like the island fox, and some lesser-flying birds, like the island scrub-jay, can not escape a fire burning out of control that might consume an entire island.
  • Santa Cruz Island is home to endemic plants and animals that only live on that one island and nowhere else in the world. If the entire island burned, some of these species might be driven to extinction.
  • The National Park is tasked with protecting historic human cultural artifacts and structures that could be destroyed.
  • People visiting the island can not easily evacuate on their own; they are dependent on sea or air transportation provided by others. The National Park must always consider visitor and staff safety.
Island scrub-jays only live on Santa Cruz Island
When lightning struck Santa Cruz Island during the night of Sept. 10th or early morning of Sept. 11th, all of these factors (and more) had to quickly be taken into account by officials at Channel Islands National Park.
2007 Catalina Island Fire
'Burnie Boots' - Catalina 2007
In 2007, fire raged up canyons and across hillsides on Santa Catalina Island. While only one female island fox was known to be injured in the fire, biologists later discovered that numerous island fox pups were lost to the flames because the fire occurred in spring and many pups were still too young to leave the dens where they were born. Catalina Island Conservancy biologists believe the injured female island fox risked her own life, walking across burning coals, to try and return to her pups in the den.

Wildfire is unpredictable, and in this incidence, the negative threats outweighed the potential positives. U.S. Forestry Service smoke jumpers were called in and they parachuted down to the island to put out the fire.

Fire on Santa Cruz Island 2017 - U.S. Forestry Dept. via Ventura Co. Star
The wildfire was first spotted by a concerned citizen on a boat. Threats to island foxes and the Channel Islands can come in many different forms. Some like disease from domestic dogs or introduced wildlife are similar to lightning, they may initially strike in one place, but the consequences can quickly spread across an entire island. Island foxes need all of us to be as vigilant as the boater who reported the wildfire - one person can make a difference.

Friday, September 15, 2017

Fox Foto Friday

Photo by Douglas E. Welch (http://Douglasewelch.com) June 1, 2013
An island fox (Urocyon littoralis) takes advantage of its natural camouflage to hide among the dry grasses of Prisoners Harbor on Santa Cruz Island.

Find out more about the properties of island fox fur that enhance camouflage and how identifying individual island foxes goes beyond color markings.

Wednesday, September 06, 2017

Tracking An Island Fox

Welcome guest writer Mike Watling. As a certified wildlife tracker and member of Ventura County Wildlife Trackers, Mike shares his expertise in identifying island fox tracks.

Visiting Santa Cruz Island this past winter, I was more excited than usual as it had rained a few days prior to the trip. The miracle of mud, following a rain, provides an excellent medium for studying the tracks left behind by animals. As a naturalist and wildlife tracker, I was looking forward to spending my day carefully observing the minute details of the delicate tracks of the Channel Island fox.

The island fox and its mainland cousin the gray fox are the only fox species capable of climbing trees. The island fox is the island's largest mammal and main predator; the top dog if you will.

Unlike the gray fox, which is primarily a nocturnal hunter, the island fox is active both day and night and can be readily observed foraging for lizards, insects, and fruit that comprise a large portion of its diet. To help conserve energy, foxes will often travel on the roads and trails found throughout the Channel Islands, leaving behind tiny tracks for the observant naturalist to find. 

Like all species in the Canidae family, the fox places its feet on the ground in a manner known as digitigrade. To put it simply, while they are moving, their body weight is being supported by the digits (toes) rather than the entire foot structure. In contrast, humans and bears are plantigrade, meaning the body weight while in moition is being supported by the entire sole of the foot. This characteristic is evident in the tracks left behind.

Consistent with all canids, the island fox has five toes on each forefoot. Toe one, the dew claw, is greatly reduced and located above the carpal pad on the inner leg. Only four toes typically appear in a track. The metacarpal pads, or palm,are fused together to form a larger rounded, yet triangular pad. The space between the toes and the pad, known as the negative space, forms an “H”.

The hind feet have four toes, and like the front, the pads are fused to form a narrow heel pad, which only partially registers in a track.  The negative space forms an “X”.
 
Island fox tracks are small, mostly symmetrical, approximately 1 to an 1 1/4 inches long by 13/16 of an inch wide, with the front track larger than the hind. The two inner toes tend to be close together and are often angled inward towards each other. Often the fur surrounding the foot will leave a visible impression in the track as well. The claws of the island fox are semi-retractable and slightly curved, and may not register. Even in mud, the claws appear very fine if at all. 

 
Island foxes generally move throughout their territory in a slight under-step trot. Having the shortest leg-to-body ratio of all the wild canines, the resulting track pattern is such that the front toes are visible ahead of a complete hind track.

While hiking the Channel Islands, take time to look closely on the side of the trail where you’ll likely encounter the tracks of the island fox, as well as other island inhabitants.  Quietly observe the entire area; look around for other pieces of evidence and you may be able to determine what the animal was doing.  Give pause, and for that moment, walk with the Island Fox. - Mike Watling

Tuesday, August 08, 2017

Visiting the Island Fox on Santa Cruz Island

What is like to visit the island fox at home? Walk along with our guest blogger - Douglas E. Welch

Island Journal - My First Visit to Santa Cruz Island


It took me over 25 years living in California to make my first visit to Santa Cruz Island. The Channel Islands have always intrigued me, but they seemed so difficult to visit.

Finally, the day arrived when our entire family boarded a boat for Santa Cruz Island. This was a trip sponsored by the Friends of the Island Fox. They took care of organizing our transport and acted as interpreters for all we hoped to see that day. The sun was shining brightly when we left Ventura Harbor, but as we got closer to the island a deep fog set in. Santa Cruz had to be out there somewhere, but we also could have been in the middle of the Pacific for all we knew. It was only by looking at my gps position on my iPhone that I knew we had to be close.


Suddenly a pier faded into view and then a shoreline and then Santa Cruz Island’s mountains. Within a few minutes, we were on dry land again and beginning our exploration of this very wild portion of California.


Because of the island’s isolation, everything looked familiar–but different. Of course, the island foxes only inhabit the Channel Island; they were completely new to me. It was amazing to see something so rare (and so darn cute) up close. They are smart, too. One fox even tried to raid a backpack while its owner napped nearby. Something you always need to be on-guard about when you visit the islands.



The flora and bird life were slightly different too. The giant coreopsis takes on huge proportions when compared to their mainland counterparts. What looked similar to a mainland scrub-jay turned out to be an island scrub-jay, also endemic to the islands. Again, familiar–but different.

For me, another unique feature of the island was the sound the cobbled rocks made as the surf washed them first onshore and then retreated. The stones rolled back and forth clinking and clunking like a stone xylophone. I watched and listen to that sound for quite a long time as we waited to board our boat home. I was amazed at its musicality.



Since this visit, I now take every opportunity to visit the Channel Islands. It is always an amazing day of unique flora and fauna and striking scenic vistas that seem to faraway, but are right here in our own backyard. - Douglas E. Welch  

Other Island Journal entries:
 
 
 

Monday, June 19, 2017

Island Fox Behavior in 2017

courtesy of K. Schafer
In 2017, visitors to the Channel Islands have the opportunity to see something that was rare just a few years ago: wild island foxes interacting with each other.

When island foxes faced extinction in 2000, surviving individuals were brought into captive breeding facilities. From 2000-2006, seeing an island fox was a momentous occasion. Since 2008, all island foxes have been returned to the wild (with the exception of a few in mainland zoos). As the populations recovered across the islands, the opportunity to see island foxes hunting and interacting with each other has increased. (seeing island fox behavior on Santa Cruz Island 2015).

Witnessing interactive behavior between island foxes is a gift provided by the successful recovery of this once endangered species. Here are some of the behaviors we saw in late May:

Vocalization: Yes, island foxes vocalize. They bark, growl, and pups make soft whimpering and eecking sounds. 

  • Barks are typically high pitched and evenly spaced. Barks may be repeated multiple times. In the distance, we heard an island fox bark eleven times in a row. This vocalization is used to warn an interloper that they have trespassed on an individual's territory. Island foxes may bark at each other or, occasionally, at humans. If an island fox barks at you, you are too close. Hear an island fox barking.
  • The Growl of an island fox is low and soft. Typically this sound is used to warn off another island fox that has approached too close. We saw an island fox curled up sleeping by the side of a dry creek bed. A second island fox approached it, coming within five feet. The fox laying down, growled at the approacher. The second fox stopped, turned around, and went the other direction.
  • Pup Sounds are typically only heard by parent foxes. The following pup vocalizations were recorded at the Santa Barbara Zoo from a pup that was abandoned by its parents. Hear island fox pup vocalization

Aggressive Territorial Behavior: Island foxes are very territorial. (Territory size) Living on an island with limited resources means quality territory is vital to survival. A pair of island foxes mates for life to protect their territory and the resources needed to feed themselves and their offspring. Challenges over territory can occasionally lead to aggressive behavior.

  • Vocalizations (see above) are used to warn other foxes and avoid physical confrontation.
  • Chasing can occur when an island fox intrudes into the territory of another island fox or pair. We saw one adult island fox chasing another adult island fox out of the campground area.
  • Physical Altercations can occur between island foxes, especially over territory. Island foxes with floppy ears are typically older individuals who have had altercations with other island foxes. The cartilage of the external ear can be damaged by bites or twisting from other foxes. Over time, repeated damage leads to ears that flop down or may even be torn off. Bites to legs are also frequent injuries. Limping island foxes are often individuals that have been bested in a squabble.
island fox with damage to ear caused by another island fox
parent island fox with two pups

Affiliative Behavior: Island foxes are family oriented and pair bonded. They demonstrate caring and friendly behavior to family members. Female offspring remain in the same area as their parents and on occasion friendly behavior may occur between adult offspring and their parents or siblings.

  • Care for Pups includes teaching pups to hunt and find food. It is not unusual during the summer to see an adult island fox leading a younger island fox around, showing them where to find specific food resources. Parents lick pups to groom them and also accept playful pounces from youngsters. Parents may discipline a misbehaving pup with a warning snarl, lifting the lips to show the teeth. The pup will show submission by lowering the head and body, flattening the ears, and licking the chin of the parent. Island Fox Pups
  • Familial Recognition or recognizing family members is a behavior that is being seen more as fox families build generations. This May we saw a young adult island fox (1-2 years old) approach an elder island fox sleeping curled up along the dry creek bed. The younger fox came right up to the older fox and sniffed it. The older fox did not growl or demonstrate any aggressive behaviors and the younger fox did not try to chase the old fox or intimidate it in any way. This interaction was completely different from the aggressive behavior seen between two other adults on the same day (see The Growl above). Do island foxes continue to recognize family members throughout their life and maintain friendly behavior toward them? (See - Two adult island foxes meet) This is definitely an area that needs further research. 
island fox pup shows submissive behavior to parent
It is exciting that there are questions to be researched regarding island fox behavior. If we had lost the island foxes on Santa Cruz, Santa Rosa, San Miguel, and Santa Catalina Islands seventeen years ago, we would have also lost the opportunity to know this species better, to understand how it behaves, and how island isolation has changed its behavior from the mainland gray fox.

Monday, March 20, 2017

Channel Island Fox Update 2016

photo courtesy of Anita Machlis
The annual meeting of the Island Fox Conservation Working Group in 2016 reported that the general status of five subspecies of California's Channel Island foxes is GOOD and STABLE. Concern for the San Nicolas Island fox continues.

2016 was a busy year for island foxes. Three subspecies were removed from the Endangered Species list and one was downlisted to Threatened status. The following update includes the population numbers from fall of 2015. (Land managers are currently compiling the fall 2016 data to present their official 2016 population numbers at the Annual Meeting in May 2017.)

San Nicolas Island

Drought impacts were a major concern in 2015-2016, however island foxes on San Miguel and San Nicolas Islands were more severely impacted. These two islands have the least amount of native plant diversity, leaving the highly omnivorous island foxes more dependent on introduced ice plant and the introduced snails and earwigs that live within it. (Island fox diet study) Continued years of drought dramatically reduced introduced species, greatly impacting the island foxes on these two islands. The situation on San Miguel and San Nicolas Islands, however, continue to be different from each other. This is the challenge of protecting island foxes.

photo courtesy of Paul Bronstein
Island Fox Update 2016 a specific island-by-island summary pdf

  • San Miguel Island ~ 382 foxes (low of 15 in the year 2000). Population numbers were revised in late 2016 going back to 2008. The population has recovered from extinction threat and slightly increased in number from 2014. Concern: Drought impact on food resources and increase in life-threatening parasites. (see Island Fox Update 2016 above)
  • Santa Rosa Island ~ 1,256 foxes (low of 15 in the year 2000). The population has recovered from extinction threat and, despite the drought, continues to thrive and increase. Concern: An unusual and fatal parasite, Leptospira, may have been introduced via sea lions. Further investigation is needed to determine the extent of threat to island foxes. 
    (see Island Fox Update 2016 above)
  • Santa Cruz Island ~ 2,170 foxes (low of ~ 80 in the year 2002). The population has recovered from extinction threat and is very robust. The increased number of older animals in the population combined with carrying capacity and drought may have caused a drop from the 2014 population high of ~ 2,700. Plant diversity on this island provides island foxes with diverse resources and drought has not been a threat. Concern: Golden eagle predation occurred again in 2016, but was limited. Biosecurity–introduced disease–remains a threat.
    native plant restoration efforts in 2016 on Santa Cruz Island
  • Santa Catalina Island ~ 1,812 foxes (low of ~ 103 in the year 2000).
    The population has recovered from extinction threat, but continued threats connected with large numbers of people visiting the island prompted the USFWS to maintain a Threatened status for this island fox subspecies. Concern: Biosecurity–introduced disease–poses a constant threat to Santa Catalina Island. Serology testing is an especially important conservation effort looking for early evidence of disease introduction. Even human trash poses threats to these island foxes
    photo courtesy of Melissa Baffa
     
  • San Clemente Island ~ 888 foxes (Not Endangered; adults only). Island foxes remain robust on this island, though the drought may have depressed survival in 2015. Concern: Island fox survival may have decreased in areas with less native plant diversity and therefore fewer food resources. The Navy has begun native plant restoration projects, but the effort is still in the early stages. The rainy season of 2016 may have positively impacted this effort. Island fox pups, abandoned by parents on this island, are the few individuals currently found in California zoos.
  • San Nicolas Island ~ 260 foxes (Not Endangered; adults only). In 2012, San Nicolas Island had the greatest density of foxes anywhere in the world and a population estimated at over 600 individuals. Since that year the population has declined and stabilized at ~ 250 individuals. Concern: The native plant diversity of this island was severely impacted in the last century. San Nicolas has the least biodiversity of native plant species. Island foxes became dependent on introduced plant species that died off during the years of consecutive drought. Island foxes have shown signs of emaciation and severe parasite infestation, either or both of these impacts may be a cause for decline. More on drought impacts as reported in 2016. The Navy has begun native plant restoration projects and the rainy season of 2016 may have positively impacted this effort. 
  •  
In addition to drought and disease impacts, there are concerns regarding the lack of genetic diversity in the San Nicolas Island fox population. To-date there is no evidence that the San Nicolas population suffers from genetic anomalies that could negatively impact their reproduction or survival. However a lack of genetic diversity can also impact how a species or subspecies is able to respond to disease challenges. Genetics and Disease Immunity Research

Everyone is watching the San Nicolas Island fox population and trying to establish why they have declined and whether or not their numbers improved in 2016. 

Keep informed of the status of the San Nicolas Island fox by subscribing to the FIF bimonthly newsletter SUBSCRIBE

Thursday, February 23, 2017

Where Can You See An Island Fox on The Mainland?

In 2017, there are less than a handful of island foxes in captivity. Since 2008 and the end of captive breeding to help recover island fox populations, the goal has been to keep island foxes in the wild.

In 2017, the only island foxes in captivity are individuals that can not be returned to the wild. Most were found as pups abandoned by their parents on San Clemente Island. Drought over the past few years has challenged island fox survival and Navy personnel on San Clemente Island have found six pups that could not be reunited with a parent and were too young to survive on their own.

Beau, formerly at the Santa Barbara Zoo, is currently at The Living Desert in Palm Springs. 

Male island foxes can be aggressively territorial which makes it difficult to have multiple males at the same location. The island-fox home at the Santa Barbara Zoo is now filled with two rambunctious brothers, Lewis and Clark. This playful duo are younger and have grown-up together. Check out their video
gray fox on the left and two island foxes to the right
Two female island foxes can be seen at the CA Living Museum in Bakersfield. They are living with a female gray fox (Urocyon cinereoargenteus). The gray fox is the ancestor species to the island fox and this match-up allows you to see how much smaller the island fox is in comparison to its ancestor. Many visitors mistake the island foxes for babies of their cousin.

island foxes have relatively short tails

gray foxes have much longer tails
Island foxes (above) have relatively short tails for their size. The gray fox (right) has a much longer tail than the island fox. What advantage is there to having a shorter tail on the islands? Is the genetic trait for a shorter tail linked to some other beneficial trait? The answer is still out there waiting to be discovered.

If you can't travel to the Channel Islands, you can still see an island fox in a few special places.

Thursday, February 16, 2017

Island Fox Awareness Day This Weekend !


How small is an island fox?
Who has bigger ears, an island fox or a fennec?
How do you fit a radio tracking collar on a wild island fox?

Discover these answers and more at the annual

Santa Barbara Zoo 
Island Fox Awareness Day
Sunday, February 19
11 AM - 3 PM

See the Zoo's two young brother island foxes. They were rescued from San Clemente Island as abandoned pups.

 

Friends of the Island Fox (2/18/17 Update - we will not be at the Zoo due to the weather) will have booths and activities:
  • Balance the Island Fox's Island Ecosystem
  • Learn How A Wild Island Fox Receives a Health Check

There will be other crafts and activities and the Animal Care Staff has scheduled the following:
  • 11 AM Island Fox Talk with Vet Technician
  • 11:30 AM Island Fox Talk with Animal Care Staff and enrichment
  • 12 PM Island Fox Talk with Animal Care Staff and enrichment
  • 1 PM Fennec Talk with Animal Care Staff and enrichment
  • 1:30 PM Fennec Talk with Animal Care Staff and enrichment
African fennecs

Come enjoy a day of foxes.

All activities included with Zoo admission. Rain may cancel. (Friends of the Island Fox will not be at the Zoo because of the weather 2/18/17 Update)

Tuesday, January 24, 2017

Support Conservation Efforts That Work


In 2015, Friends of the Island Fox began working with the Catalina Island Conservancy (CIC) on a project to replace deteriorating trash containers that threatened island fox survival. (See the direct and in-direct danger to island foxes)

As of January 2017, FIF has funded the installation of 7 “Fox-Saver” bins. Julie King, Director of Conservation and Wildlife Management with the CIC sent us this exciting report from the field:

The wildlife-proof cans that we installed out at Parson's Landing (remote beach campground) have made a HUGE difference! 



Before I would spend 30 minutes each day I was out there [counting island foxes] picking up trash that foxes and ravens had drug into the bushes. I would always catch foxes there ... loaded with lice. [They had become] habituated moochers. This year, it was so different. No trash to be found on the ground or in the bushes and no foxes caught. To me, no foxes in camp is a testament to the effectiveness of the new trash cans. No more free meals. Outside of camp, there were plenty of foxes and they were all in great shape. Nice to see!


Six new bins have replaced the two large dilapidated wooden containers. The result is healthier island foxes, no foxes coming to the area for free food and becoming more likely to be hit by automobiles, and no foxes trapped inside deathtrap trash cans.

We know what works. Removing an unnatural food source also reduces unnatural concentrations of island foxes thereby decreasing the possible spread of disease. Prevention of problems is financially cost effective and reduces the need to react to crisis situations.

Friends of the Island Fox supports conservation measures that are proven to work:



We are working with our friends at CIC on other measures to make campgrounds less attractive to island foxes and more usable for humans.

Now more than ever, island foxes need you to secure their survival into the future.

Tuesday, December 20, 2016

Island Foxes Thank You for 2016

photo courtesy of Hal Epstein
2016 was an AMAZING YEAR for 
Channel Island foxes!

The four subspecies, which barely escaped extinction 16 years ago, all reached stable recovery levels. This historic recovery prompted the U.S. Fish & Wildlife Service to change the status of the island fox on the U.S. Endangered Species list.

Island foxes from the northern islands, San Miguel, Santa Rosa, and Santa Cruz, were removed completely from Endangered status, while the Catalina Island fox was downlisted to Vulnerable. For more on this historic recovery.

Island foxes are no longer an Endangered Species, but they continue to need public vigilance to support their recovery and future stability. Friends of the Island Fox will continue to support the monitoring of island foxes and responses to their conservation needs.



Thank you to everyone who helped Friends of the Island Fox fund the following in 2016:

With quarters and classroom "Fox Boxes," private donations and corporate grants, YOU helped save the island fox from extinction.

May 2017 continue the community effort to protect island foxes.