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GPS Predators: Do Coyotes and Cactus Keep Raccoons At Bay? by Dr. Susan Cooper

It is tough being a quail.  From egg to adult you are constantly tops on the dinner menu.  But what do we really know about the predators of quail?  Based on covert photography at nest sites, we tend to assume that raccoons, coyotes, bobcats, skunks and a host of other small predators spend much of their time on search and destroy missions against hapless quail.  Yet predator removal programs consistently fail to create an abundance of quail.  Something is amiss in our perception of the effect of predation on quail populations?

At RPQRR, we have an abundance of coyotes, a modest population of raccoons,coon_cr.jpg but skunks are uncommon, and none of us has ever spotted an opossum, nor its tracks.   Dr. Rollins hypothesizes that the coyotes suppress smaller mesocarnivores, either directly (i.e., preying on them) or indirectly (i.e., by restricting them to certain areas [e.g., riparian areas]).   So how do coyotes and raccoons use the RPQRR's landscape, especially during the nesting season for quail?

Recent technological improvements have allowed us to enter the nocturnal world of mammalian predators.  Last May we captured 4 coyotes and 8 raccoons, fitted them with collars containing GPS units and then set them free again.  The GPS units logged the animal's precise location every 5 minutes from dusk to dawn for 5 weeks, then the collars released automatically.  We retrieved them and downloaded the information which allowed us to unravel the mystery of the nocturnal movements of these predators.

The wily coyotes virtually never left the safety of RPQRR (coyotes are not controlled at RPQRR).  They showed a strong preference for hunting in the grasslands and avoided the densely wooded creek beds.  Each animal ranged over a territory of about 1,000 acres.  Walking about 6 miles every night, in a month's time they obtained complete coverage of their territory.  We know that dense stands of prickly pear within the grassland deter hunting dogs, but coyotes are made of sterner stuff than Dr. Rollins' bird dogs and they were undeterred by dense cactus.  Even so, at night coyotes took advantage of the ranch roads for easy travelling, as confirmed by their numerous scat and tracks.  RPQRR has quail feeders on some of these roads, but these did not appear to be of much interest to the coyotes.

chopper_cr.jpgSmall predators have bigger predators of their own, so raccoons must be wary of coyotes.  In fact one collared raccoon was found dead near a quail feeder on the day before his collar was to release, and it looked like he may have fallen prey to a coyote. 

Female raccoons were strictly limited to the riparian areas with dense undercover and tall trees.  Since quail do not inhabit such areas these female raccoons are presumed innocent of the crime of raiding quail nests.  Whether they would venture into the grassland if coyotes were absent remains to be seen. 

Male raccoons were much more adventurous.  While females stayed within home ranges of only 120 acres, male raccoons used areas as large as those of coyotes and travelled about 4 miles each night.  They used the wooded creek beds to range far beyond the boundaries of RPQRR.  

Male raccoons often ventured beyond the protection of the wooded areas into the grasslands and onto the rocky hillsides where they dozed the day away under tangled boulders.  Unlike the long-legged coyotes, raccoons strongly avoided entering the most cactus-infested grasslands.  So while cactus may not afford quail much protection from coyotes it is apparently effective against raccoons. 

When traversing cactus-laden grasslands, raccoons travelled along the ranchallraccoons_cr.jpg roads.  The roads chosen were those on which feeding stations were set up for quail.  At each feeder the raccoons lingered, obviously enjoying the easy meal of protein pellets and milo provided for the quail.  This opens the question as to who is the main beneficiary of the supplemental food, the quail or their enemy?  Could the provision of food be luring raccoons into quail nesting habitat or could it be decoying them from raiding nests by providing alternative food?  Ongoing camera surveillance of feeders confirms that raccoons are frequent visitors.

GPS collars can only tell us where the predator went, not whether it found or missed a quail or its nest, but this study suggests that the effects of coyotes and raccoons on quail are not additive.  Presumably, the presence of coyotes keeps at least the female half of the raccoon population in the dense cover away from prime quail nesting habitat.  An analysis of coyote scat will reveal whether quail figure highly in the diet of coyotes.  If not, then it may be worthwhile not to remove coyotes from land devoted to raising quail.

Dense cactus in the grassland, like predators, is often targeted for removal, yet it too helps protect quail by limiting access to nesting areas by raccoons.  As noted in the January issue of e-Quail, cactus can be useful.  Nest survival is improved by its prickly defenses against nocturnal prowlers.  So tolerating both coyotes and cactus may keep the pesky raccoons at bay, giving the quail a better chance to produce the next generation.

(Dr. Cooper is an Associate Professor with AgriLIFE Research working out of the Uvalde office; she has become an integral part of our research effort at RPQRR.)


Cadence call (Conservation cadences from the Bobwhite Brigade)

A bobwhite quail has many needs; 

Insects, greens, and forb seeds.

On your next outdoor excursion, 

Note how they need interspersion.

Sound off:  bob-white;

Sound off:  bob-white,

Bring it on down now,

Bob-white, bob-white, Bobwhite Brigade, Bobwhite Brigade.


Coyote Scat Analysis at RPQRR by Lloyd LaCoste

Whenever the topic of quail management comes up, a discussion of predatorscat.jpg control is almost certain to ensue. Should the conscientious quail manager control every predator that could potentially eat a quail or depredate a nest, if it is legal to do so? Should certain predators be controlled while others are left alone? For example, what effect do coyotes have on bobwhite populations?  Scientific research has not yet provided clear answers to these questions.

There are plenty of coyotes at RPQRR, so we decided to investigate. Are they eating quail or are they eating rats? One way to find out what goes into a coyote is to look at what comes out. Once a month, we collect 30 scats (i.e., droppings) from around the ranch.  Conveniently, coyotes seem to like depositing their scat in the middle of roads, so they are easy to locate and collect. The date and the GPS location of each sample is recorded before it is placed in a paper bag to dry.  When dry, the samples will be analyzed to determine what the coyotes have been eating. Scats will be collected for several years to see how diet may vary over time.

Of course, it will be interesting to find out how often coyotes are eating bobwhite quail or their eggs. However, it will also be interesting to discover what else they are eating. Are they eating smaller "mesocarnivores (i.e., skunks)? If so, they may be doing the quail a favor by reducing the number of nest predators. Are they eating large numbers of rodents? If so, they may be reducing the numbers of animals that compete with quail for seeds. Does their diet change on a seasonal or annual basis? Perhaps they eat small mammals in winter but quail chicks in the summer. These are the sorts of questions we hope to answer by analyzing coyote scat.

(LaCoste is a research assistant and on-site manager at RPQRR)


In the News

Martin hired as fundraiser at RPQRR

Chip Martin of Anson was hired recently as Director of Development for RPQRR.  Previously Martin had worked since 1991 as a Regional  Director for Quail Unlimited in Texas, so he's no stranger to the opportunities, and issues, surrounding quail in north Texas.   Martin will also support Quail Coalition, Inc. as Director of Shared Services.  He can be contacted at 325-325-823-3347 or via e-mail at chip.martin@quailresearch.org. 

Bobwhite Brigade Seeking Youth AND Adults

The Bobwhite Brigade celebrates its 18th anniversary this summer.  Two Bobwhite Brigade camps are held (Rolling Plains and South Texas).  See www.texasbrigades.org for applications and camp dates.  Adults are encouraged to sign up as "Covey Leaders"; stay for an hour, and you'll be impressed; stay for a day, and you'll be amazed, stay overnight, and you'll become an indentured servant to the Brigades.

RPQRR now on Facebook

You can keep up with happenings at RPQRR now on Facebook.  Go to www.facebook.com/RPQRR and sign up to become a fan.


Plant of the Month

Chittam (Current taxonomy is Sideroxylon lanuginosum, although most of us still refer it to as Bumelia lanuginosa.)

Chittam is one of my favorite woody plants, and I suspect many species of wildlife in the Rolling Plains would concur.   At RPQRR chittam is restricted mostly to riparian areas, but further east (e.g., Shackelford County) it can be found commonly on upland sites.  Chittam often forms a thicket which serves as an excellent "quail house."  The fruits of chittam are black and about the size of a raisin.  The seed therein is a caramel color and is a favorite of many birds, and some mammals (especially coyotes and raccoons).

This past year was a good one for chittam; it's fruits still adorn the thicket south of our headquarters.  Doves, and various songbirds, have flocked there too.  For more information, and pictures, see www.noble.org.  For PDF version, [Click Here]

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  February 2010

  Vol 2. No.2

Ask Dr. Dale?

Q:  Could the increased incidence of feeding "deer corn" in Texas, and the potential for aflatoxin poisoning, be related to the ‘quail decline' observed over much of west Texas? - RS

A: Could be; based on a study done by Texas AgriLIFE Extension Service in 1999, about 6 million bags of deer corn are fed annually in Texas.   Almost half (44%) of the bags sampled  contained over 200 parts per billion (ppb), and 20% were above 100 ppb-the maximum level allowed for consumption by poultry is 20 ppb.  Certainly the use of "deer corn" has become more popular over the past 20 years in the Rolling Plains as the white-tailed deer herd (and subsequently hunting interest) has increased.  Exactly how the increased use of corn might impact quail is difficult to assess.  Think about it . . . if aflatoxicosis was as serious a problem as it is often touted to be, there shouldn't be a wild turkey in the Edwards Plateau (where deer abundance is higher and the history of feeding deer corn has been common for about 60 years).  And there are still many places that don't feed deer corn in west Texas, but quail abundance seems to be down on these sites too.  More on this issue in an upcoming issue of e-Quail;  for the meantime see Dr. Neal Wilkins' article Aflatoxins: A Concern for Quail Managers?

Quail Flashback

"We must have the ‘know how' to grow bobwhites in spots where none are able to exist today; to increase them where their numbers are meager and coveys are scattered; and to reach greater abundance yet on well stocked lands." (V. E. Davidson, Bobwhites on the Rise, 1949:17) 

Reader Poll

Where do you hunt quail in Texas??  To participate, [Click Here]. 

Did You Know?

Bobwhites and blue quail can, and do occasionally, hybridize in the wild. Most of the hybrids resemble a bobwhite with a dirty face and reduced crest (i.e., “topknot”). Based on records from the literature, it seems most hybrids occur along a line from Fisher County to Gray County. The hybrids, sometimes referred to as “blobs”, are “true hybrids”, i.e., sterile. Paul Melton of Roby, chairman of RPQRR’s Advisory Committee, has killed 13 “blobs” in his hunting career thus far. Please [Click Here] to view.

Blues Bros.

Due to popular demand, a Desert QuailMasters course will be held in 2010.  Patterned after the popular "QuailMasters" courses held in odd-numbered years since 2005, DQM will address management of all four species of quails found in Texas.  (Can you name all four?  Bobwhite, scaled ["blue"], Gambel's, and Mearn's [Montezuma].) but scaled quail management will comprise about 60% of the time.  DQM is sponsored by RPQRR, Texas AgriLIFE Extension Service, and the Texas Wildlife Association.  The course consists of 4 sessions, each of which is 3 days; locations include Midland, Alpine, Truth or Consequences, NM, and one site TBA by consensus of participants.  For more information see texas-wildlife.org

By the Numbers

25.  RPQRR has 25 "mile markers" from which spring cock-call and fall covey-call counts are conducted.  In June, six of these points are selected randomly to set up "dummy nests."  We also conduct "scent station" surveys from each site in January and July to index predator abundance.

MBATR

That's "meanwhile back at the ranch" . . . With drip torches in hand, we've left our mark on the RPQRR during January, and several other burns are planned for this month. Graduate student Kurt Huffman will be monitoring diet selection by cows on patch-burned areas.  Our spring trapping-banding-radiomarking effort kicks off this month and will continue through March.

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Rolling Plains Quail Research Ranch
7887 Highway 87 North
San Angelo, Texas 76901
Ph: 325-653-4576
Fax: 325-655-7791
DRollins@ag.tamu.edu

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