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Consumption of a dangerous ant (Camponotus vicinus) by a threatened minnow (Notropis simus pecosensis).

On 20 April 2011, SRD collected a live Pecos bluntnose shiner (Notropis simus pecosensis, 59-mm standard length) in the Pecos River near the confluence of Willow Creek, Chaves County, New Mexico, with a large, major-worker, carpenter ant (Camponotus vicinus; width of head, 3.4 mm) lodged in its throat. The ant was facing out of the mouth of the shiner and mandibles of the ant were locked, in death, to the lower jaw of the fish (Fig. 1).

Notropis simus pecosensis is listed as threatened by federal and state governments and is endemic to the Pecos River of New Mexico and Texas (Hoagstrom et al., 2008a). It typically occupies fluvial habitats of the mainstem Pecos River, which is characterized by a wide, sand-bed channel (Hatch et al., 1985; Propst, 1999; Hoagstrom et al., 2008b).

Opportunistic feeding on terrestrial invertebrates likely is important for N. s. pecosensis if periodic flash flooding makes them available. Drift feeding on terrestrial invertebrates (including ants) is widespread within Notropis (e.g., Reisen, 1973; Mendelson, 1975; Whitaker, 1977; McNeely, 1987; Bean et al., 2010). Starrett (1950) noted that three species of Notropis in the Des Moines River, Iowa, took terrestrial invertebrates during floods. Further, the streamlined morphology of N. s. pecosensis, its forward-facing mouth, raptorial pharyngeal teeth, and habitat associations suggest it feeds in fluvial habitats (Hubbs, 1941; Hatch et al., 1985; Bestgen and Platania, 1990; Hoagstrom et al., 2008a), most likely on drifting animals entrained within the column or on the surface of water. S. P. Platania (in litt.) surveyed 655 stomachs of N. s. pecosensis and listed, among other items, terrestrial invertebrates (including ants) and Bestgen and Platania (1990) reported terrestrial invertebrates in 6 of 15 stomachs examined from the extinct Rio Grande bluntnose shiner (Notropis simus simus).

Many species of North American Camponotus are polymorphic and their major-workers and queens are the largest ants in western North America (Wheeler and Wheeler, 1986). Camponotus vicinus is distributed widely in New Mexico, where it favors sandy and rocky soils (such as those near our collecting locality) and sometimes occupies riparian habitats (Milford, 1999; Ellis et al., 2002; MacKay and Mackay, 2002). Although ground nesters, C. vicinus commonly tends homopteran larvae (i.e., aphids) on vegetation (MacKay and MacKay, 2002). Thus, workers can fall into the river from overhanging plants and can be entrained by floods.

We presume the ant locked onto the jaw and, by filling the mouth of the shiner, could have led to death of the shiner, but the shiner appeared to be in good health at time of capture. locking onto potential predators is a stereotypical behavior of ants exhibited in the context of defense of colonies. For example, lucas and Brockmann (1981) studied the predatory behavior of antlions (Myrmeleon crudelis) they fed red-imported fire ants (Solenopsis invicta) and, in two cases, antlion larvae died with fire ants locked onto their mandibles. Lucas and Brockmann (1981) speculated that the antlions died because attached ants disrupted normal pit-building behavior and they estimated that [less than or equal to] 20% of antlion larvae might suffer this fate.

It appears that either N. s. pecosensis normally prevails over ants as prey or large major-worker ants rarely are encountered. Avoidance of flooded riparian areas in the Rio Grande of New Mexico (Milford, 1999) and tolerance for relatively dry habitats (Mankowski and Morrell, 2011) suggest that C. vicinus may avoid habitats typically inundated by floods. In general, floods are catastrophic for ground-nesting ants and Camponotus is rare in habitats with high frequency of flooding (Ballinger et al., 2007). We collected the shiner at a site with high banks that preclude inundation of the floodplain during typical flooding events. However, riparian trees and shrubs overhang the river from the banks. Hence, it seems most likely the ant fell into the river from overhanging vegetation. Cadwallader et al. (1980) reported that sites in the Murray-Darling Basin, Australia, with overhanging vegetation contributed more terrestrial invertebrates to diet of fish than areas without overhanging vegetation, and that larger fish ate more terrestrial organisms than smaller fish. The 59-mm shiner we collected is large for this species (Hoagstrom et al., 2008b).

Predators take a risk when they attack prey that is well armed or relatively large. Specialized predators tend to circumvent the defenses of target prey (e.g., Wignall and Taylor, 2009) and predators that specialize on eating ants have strategies and behaviors that reduce their risk (e.g., Lucas and Brockmann, 1981; Allison and Cepeda, 2009). Thus, it is possible that N. s. pecosensis rarely encounters major-workers of C. vicinus and its typical attack behavior is poorly suited to subdue such prey, or it could be that the individual shiner described herein unsuccessfully took a risk for a potentially rewarding meal.

The United States Bureau of Reclamation contract 04AA402212 provided funding for collecting fish. We thank S. D. Blocker and E. I. Gilbert for assistance in the field, R. A. Meyers for photography and composition of the figure, and I. Asensio-Sierra for translation of the abstract to Spanish.

Submitted 26 September 2011. Accepted 28 November 2012. Associate Editor was Robert J. Edwards.

LITERATURE CITED

ALLISON, P. S., AND J. C. CEPEDA. 2009. Nesting and hatchling behavior of the Texas horned lizard (Phrynosoma cornutum). Southwestern Naturalist 54:211-213.

BALLINGER, A., P. S. LAKE, AND R. MACNALLY. 2007. Do terrestrial invertebrates experience floodplains as landscape mosaics? Immediate and longer-term effects of flooding on ant assemblages in a floodplain forest. Oecologia (Berlin) 152:227-238.

BEAN, P. T., C. S. WILLIAMS, P. H. DIAZ, AND T. H. BONNER. 2010. Habitat associations, life history, and diet of blackspot shiner, Notropis atrocaudalis. Southeastern Naturalist 9:673-686.

BESTGEN, K. R., AND S. P. PLATANIA. 1990. Extirpation of Notropis simus simus (Cope) and Notropis orca Woolman (Pisces: Cyprinidae) from the Rio Grande in New Mexico, with notes on their life history. Occasional Papers of the Museum of Southwestern Biology 6:1-8.

CADWALLADER, P. L., A. K. EDEN, AND R. A. COOKE. 1980. Role of streamside vegetation as food sources for Galaxias olidus Gunther (Pisces: Galaxiidae). Australian Journal of Marine and Freshwater Research 31:257-262.

ELLIS, L. M., M. C. MOLLES, JR., C. S. CRAWFORD, AND F. HEINZELMANN. 2000. Surface-active arthropod communities in native and exotic riparian vegetation in the middle Rio Grande Valley, New Mexico. Southwestern Naturalist 45:456-471

HATCH, M. D., W. H. BALTOSSER, AND C. G. SCHMITT. 1985. Life history and ecology of the bluntnose shiner (Notropis simus pecosensis) in the Pecos River of New Mexico. Southwestern Naturalist 30:555-562.

HOAGSTROM, C. W., J. E. BROOKS, AND S. R. DAVENPORT. 2008a. Spatiotemporal population trends of Notropis simus pecosensis in relation to habitat conditions and the annual flow regime of the Pecos River, 1992-2005. Copeia 2008:5-15.

HOAGSTROM, C. W., J. E. BROOKS, AND S. R. DAVENPORT. 2008b. Recent habitat associations and the historical decline of Notropis simus pecosensis. River Research and Applications 24:789-803

HUBBS, C. L. 1941. The relation of hydrological conditions to speciation of fishes. Pages 182-195 in A symposium on hydrobiology (J. G. Needham, P. G. Sears, and A. Leopold, editors). University of Wisconsin Press, Madison.

LUCAS, J. R., AND H. J. BROCKMANN. 1981. Predatory interactions between ants and antlions (Hymenoptera: Formicidae and Neuroptera: Myrmeleontidae). Journal of the Kansas Entomological Society 54:228-232.

MACKAY, W. P., AND E. E. MACKAY. 2002. The ants of New Mexico. Edwin Mellen Press, Lewiston, New York.

MANKOWSKI, M. E., AND J. J. MORRELL. 2011. Role of relative humidity in colony founding and queen survivorship in two carpenter ant species. Journal of Economic Entomology 104:740-744.

MCNEELY, D. L. 1987. Niche relations within an Ozark stream cyprinid assemblage. Environmental Biology of Fishes 18:195-208.

MENDELSON, J. 1975. Feeding relationships among species of Notropis (Pisces: Cyprinidae) in a Wisconsin stream. Ecological Monographs 45:199-230.

MILFORD, E. R. 1999. Ant communities in flooded and unflooded riparian forest of the middle Rio Grande. Southwestern Naturalist 44:278-286.

PROPST, D. L. 1999. Threatened and endangered fishes of New Mexico. New Mexico Department of Game and Fish, Santa Fe, Technical Report 1:1-84.

REISEN, W. K. 1972. The influence of organic drift on the food habits and life history of the yellowfin shiner, Notropis lutipinnis (Jordan and Brayton). American Midland Naturalist 88:376-383.

STARRETT, W. C. 1950. Food relationships of the minnows of the Des Moines River, Iowa. Ecology 31:216-233.

WHEELER, G. C., AND J. N. WHEELER. 1986. The ants of Nevada. Natural History Museum of Los Angeles County, Los Angeles.

WHITAKER, J. O., JR. 1977. Seasonal changes in food habits of some cyprinid fishes from the White River at Petersburg, Indiana. American Midland Naturalist 97:411-418.

WIGNALL, A. E., AND P. W. TAYLOR. 2009. Alternative predatory tactics of an araneophagic assassin bug (Stenolemus bituberus). Acta Ethologica 12:23-27.

Stephen R. Davenport, * John F. Mull, and Christopher W. Hoagstrom

United States Fish and Wildlife Service, New Mexico Fish and Wildlife Conservation Office, 3800 Commons NE, Albuquerque, NM 87109 (SRD)

Department of Zoology, Weber State University, 2505 University Circle, Ogden, UT 84408 (JFM, CWH)

* Correspondent: Stephen_Davenport@fws.gov
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Author:Davenport, Stephen R.; Mull, John F.; Hoagstrom, Christopher W.
Publication:Southwestern Naturalist
Article Type:Report
Geographic Code:1USA
Date:Mar 1, 2013
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