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Assemblage Structure of an Eastern Texas Aquatic Turtle Community

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Assemblage Structure of an Eastern Texas Aquatic Turtle Community Herpetological Conservation and Biology 10(2):695–702. Submitted: 18 November 2014; Accepted: 29 April 2015; Published: 31 August 2015. ASSEMBLAGE STRUCTURE OF AN EASTERN TEXAS AQUATIC TURTLE COMMUNITY 1,2 1 3 4 J. DAREN RIEDLE , RICHARD T. KAZMAIER , JAMIE KILLIAN , AND WES B. LITTRELL 1Department of Life, Earth, and Environmental Sciences, West Texas A&M University, Canyon, Texas 79015, USA; e-mail: [email protected] 2Current Address: Ecological Services Section, Kansas Department of Wildlife, Parks, and Tourism, Pratt, Kansas 67124, USA. e-mail: [email protected] 3Texas Parks and Wildlife Department, Keechi Creek Wildlife Management Area, Streetman, Texas 75859, USA; e-mail: [email protected] 4Texas Parks and Wildlife Department, Gus Engeling Wildlife Management Area, Tennessee Colony, Texas 75861, USA; deceased Abstract. —In recent years there has been a significant increase in our knowledge of global and regional patterns of turtle diversity. Species assemblage patterns are thought to be predictable across larger geographic scales, although there is still much to learn about assemblage patterns at local scales. Previous null model testing of aquatic turtle assemblages suggested that microhabitat and food were important dimensions in determining turtle community structure, but more data are needed to refine our understanding of their assemblage patterns at local and regional scales. We sampled for aquatic turtles at Gus Engeling Wildlife Management Area (GEWMA) in eastern Texas, USA, between 2007 and 2009 to test for species segregation along environmental gradients and between macro-habitats. We captured eight species of aquatic turtles at GEWMA, which segregated along environmental gradients based on stream flow, depth, availability of basking structure, and percentage of emergent vegetation. We also observed segregation among macrohabitat types between closely related species of both chelydrids and kinosternids. Key Words.—community ecology; emydids; kinosternids; chelydrids INTRODUCTION serpentina), and Common Musk Turtles (Sternotherus odoratus) primarily occurred within more lentic sloughs Ecologists have long been interested in how factors and oxbows (Bodie et al. 2000; Anderson et al. 2002; like biogeography and niche relationships interact to Dreslik and Phillips 2005). create patterns of turtle diversity. Globally, turtle Community structure at local scales can be explained species richness is greatest within the lower Ganges- by differences in habitat associations among species. Brahmaputra River Basin in India (23 species) and the Ultimately, adaptation of species to biotic and abiotic Mobile River Basin in Alabama, USA (19 species; conditions results in a fit between the organism and its Iverson 1992; Buhlmann et al. 2009). In the USA, environment, which fundamentally influences local partitioning within and between northern and southern community structure (Losos 1996; Stephens and Wiens species assemblages in regions of sympatry has been 2004). Understanding the roles of local and regional documented, suggesting little exchange in species on factors influencing local richness is integral to large regional scales (Moll and Moll 2004; Dreslik and developing conservation strategies for species and Phillips 2005). In the southeastern USA, high species ecosystems. For many taxa, such as turtles, that have richness patterns are related to high rates of speciation undergone world-wide declines (Klemens 2000), local within the Emydidae and Kinosternidae, resulting in patterns of community structure are still poorly smaller geographic range sizes, and increasing regional, understood. but not local species diversity (Stephens and Weins Luiselli (2008) tested for non-random patterns in 2003). Local species pools are generally restricted to freshwater turtle community structure using null models specific river drainages reducing interactions on larger based on data from the peer-reviewed literature. His geographic scales. Within drainages, species tend to results suggested that community structure was non- show strong segregation between (Anderson et al. 2002; random, and that microhabitat and food were the two Dreslik and Phillips 2005) and within (Bodie et al. 2000; most important dimensions in determining community Lindeman 2000) lentic and lotic environments. Turtles structure in turtles. Three regional studies of turtle within the genera Graptemys and Apalone tend to communities demonstrated predictable patterns in turtle dominate lotic habitats; whereas, Sliders (Trachemys assemblages over larger scales based on habitat scripta), Common Snapping Turtles (Chelydra relationships (Donner-Wright et al. 1999; Dreslik and Copyright © 2015. J. Daren Riedle 695 All Rights Reserved Riedle et al.—Texas turtle community structure. Phillips 2005; Riedle et al. 2009). Within those studies, single 7.4 m × 67 cm lead. The two rectangular front species assemblages could be categorized as lentic or frames were 95 cm × 67 cm, followed by four 67 cm lotic communities, although there may be seasonal shifts diameter hoops. Both fyke nets had a single vertical slit in assemblages as scarcity of permanent water in lentic funnel within the rectangular frames. There were two habitats results in mixing of species in lotic habitats 31-cm diameter stretchable funnels leading to the cod (Bodie and Semlitsch 2000; Bodie et al. 2000; Anderson end with a square mesh size of 1 cm. The larger hoop et al. 2002). To better understand how local scale (Memphis Net and Twine; Memphis, Tennessee, USA) processes influence the structure of turtle communities, consisted of three 88-cm diameter metal rings and one more empirical testing is needed. We sampled one site in 31-cm diameter stretchable funnel. Overall trap length east Texas from 2007 to 2009 to determine the degree of was 245 cm and the square mesh size was 2.5 cm. overlap of use of macrohabitats and to test for We purchased collapsible box traps and sea bass traps segregation of turtle species along environmental from Memphis Net and Twine (Memphis, Tennessee, gradients. USA). The mini catfish hoop net had four 47-cm diameter fiberglass hoops, two 27-cm diameter METHODS AND MATERIALS stretchable funnels, and an overall length of 155 cm (square mesh size 2.5 cm). Small box traps were 59 cm Study area.—Our study area was located in Anderson × 43 cm × 22 cm, with a square mesh size of 1 cm. County, Texas, USA, on the Gus Engeling Wildlife There was a 43-cm, horizontal-slit funnel opening on Management Area (GEWMA) managed by the Texas opposite ends of the long axis of the trap. Large box Parks and Wildlife Department (TPWD). GEWMA is a traps were 79 cm × 60 cm × 25 cm with a square mesh 4,434-ha property encompassing a large portion of size of 1 cm, and had a 60-cm horizontal-slit funnel on Catfish Creek, a major tributary of the Middle Trinity opposite ends of the long axis of the trap. Dome traps River Basin. Twenty-four small creeks feed Catfish were 96 cm × 64 cm × 61 cm. Square mesh size was 2.5 Creek, most of which are spring fed. Habitat associated cm and there were two 15-cm rigid funnels (funnel held with the Catfish Creek ecosystem is characterized by open with a plastic ring) located on each end of the trap. Post Oak (Quercus stellata) savanna, bottomland We baited traps with sardines and fresh fish, used both hardwoods, marshes, swamps, bogs, and springs. singly and in combination depending on availability. Aquatic habitat at GEWMA is represented by Catfish The number of traps set during each trapping season was Creek and its tributaries, adjacent scours and backwater dependent on availability, which was driven by cost, as habitat, open canopy marshes, several small ponds and traps ranged from US $30–1,100 depending on trap type. larger lakes. Aquatic habitat along Catfish Creek is We set all trap types in all available habitats, although augmented by a series of levees and flood control gates, the number of each trap type used during a trapping built in cooperation with Ducks Unlimited, to provide session was dependent upon variables such as depth and seasonal wetlands and green tree swamps for waterfowl. flow (Riedle 2014). We checked traps at least once In addition, there are several ponds or borrow pits every 24 h, with trap sets usually completed by early-late associated with the levees (Eric Wolverton, pers. afternoon and checked by late morning of the next day. comm.). Sampling gear was set so that some portion was exposed above the water surface, providing air space for turtles Sampling.—Trapping methods for aquatic turtles can and other air breathing organisms. show biases in captures among species, age classes, and sexes (Cagle and Chaney 1950; Ream and Ream 1966; Community analysis.—To measure the relative Koper and Brooks 1998). To more completely sample amount of habitat overlap between species at GEWMA, aquatic habitats at GEWMA, we used seven types of trap we used Pianka’s Index of Niche Overlap (Pianka, gear, and sampled between mid-April and late July, 1973): 2007–2009. Trap gear consisted of two sizes of fyke 2 2 nets, two sizes of hoop nets, two sizes of collapsible box =PiAPiK /√P iAP iK traps, and one size of sea bass/dome traps. The large fyke net (Christensen Nets; Everson, Washington, USA) was 4.5 m in length (front frame to cod end) with a where PiA and PiK represent proportional habitat use of single 14.5 m × 88 cm lead. The two anterior one species (A) to a second species (K), and S is the rectangular frames were 120 cm × 88 cm followed by number of species. We calculated niche overlap using five, 88-cm diameter round hoops, with three 3-cm EcoSim (Gotelli and Entsminger 2001). We diameter stretchable funnels leading to the cod end. characterized habitat types as: Creek (flowing waters Square mesh size was 1 cm. The smaller fyke net associated with Catfish Creek and its tributaries); (Christensen Nets; Everson, Washington, USA) was 3.3 Backwater (scours and flooded timber associated with m in length from the front frame to cod end, and had a the Catfish Creek floodplain); Marsh (shallow, open 696 Herpetological Conservation and Biology TABLE 1.
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