Daniel Saenz

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Variation in behavior, morphology and life history traits of larval anurans across predator gradients, and consequences of that variation, have been abundantly studied. Yet the functional link between morphology and burst-swimming speed is largely unknown. We conducted experiments with two divergent species of anurans, Scaphiopus holbrookii and Rana(More)
We surveyed anuran calls nightly at eight ponds in eastern Texas from 1 January 2001 through 31 December 2002. Air temperatures and daily rainfall also were recorded for each of the sites. Eastern Texas contains a diverse temperate anuran fauna and a climate that provides a range of conditions for anuran reproduction. During our study, we measured air(More)
-The effects o f Red-cockaded Woodpecker (Picoi&s bo~~~cr/i.r) rnanagenxm on nontarget birds is not widely known. Intensive managentcnt forpine specialists such as the Red-cockaded Woodpecker may negatively impact both Nenrctic-Neotl-apical and Temper-ate Zone migrants associated with hardwood vegetation. ‘lb evaluate possible pctsitive and negative(More)
We tested the hypotheses that potential egg predators, crayfish Procambarus nigrocinctus and dytiscid Cybister sp. larvae, would accelerate the timing of hatching and that a larval predator, dragonfly naiad Anax junius, would delay hatching in the southern leopard frog (Rana sphenocephala). We also tested the hypothesis that differences in response would be(More)
—We tested the palatability of 12 species of anuran larvae that occur in eastern Texas using four common predators. Palatability was determined by offering larvae to predators and recording the behavior of the predator. We also tested for ontogenetic shifts in palatability in twelve species of anuran larvae. Incilius nebulifer, Anaxyrus woodhousii,(More)
-For several decades general opinion has suggested that southern flying squirrels (Gluucomys volans) have a negative effect on Red-cockaded Woodpeckers (Picoides borealis) through competition for cavities and egg/nestling predation. Complete removal of hardwood trees from Red-cockaded Woodpecker cavity tree clusters has occurred on some forests because(More)
-occupancy of 240 nest boxes in pure pine, pine-hardwood, upland hardwood, and bottomland hardwood forests (60 boxes in each forest type) were monitored for six years on the Stephen F. Austin Experimental Forest, Nacogdoches County in eastern Texas. Three boxes were placed at twenty sites in each forest type. Initially, each site had a box with 3.2, 4.7, or(More)
Arthropod density on the boles of loblolly pines (Pir~s tczdu) was compared between a stand with and stand without hardwood midstory and between a stand of loblolly and shortleaf pines (p cckirzntn) in the Stephen E Austin Experimental Forest, Nacogdoches Co., Texas, USA from September 1993 through July 1994. Arthropod density was greatest (f = 5.67, 10(More)
Diet and prey handling behavior were determined for Louisiana pine snakes (Pituophis ruthverzi) and black pine snakes (E n7elarzolrucu.~ lodingi). Louisiana pine snakes prey heavily on Baird’s pocket gophers (Gporn~s hrevicqs), with which they are sympatric, and exhibit specialized behaviors that facilitate handling this prey species within the confines of(More)