Diet of the Fresh-Water Turtle Chelodina-Longicollis (Testudines, Chelidae) From the Coastal Dune Lakes of the Jervis Bay Territory

Georges, Arthur; Norris, RH; Wensing, L

doi:10.1071/wr9860301

Cited by 43 publications

(33 citation statements)

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“…We stored sorted samples in 90% ethanol, and then dried on absorbent paper for 10 min before weighing (+0.01 g). We only recorded potential prey items if they occurred in the diet of eastern long‐necked turtle (see Chessman 1984, Georges et al 1986).…”

Section: Methodsmentioning

confidence: 99%

Suburbs: dangers or drought refugia for freshwater turtle populations?

2011

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Urbanization is one of the most rapidly expanding forms of habitat alteration worldwide. Wildlife differs in their responses to urbanization depending upon species and site‐specific factors. We used capture‐mark‐recapture to examine the abundance, population demographics, growth, and movements of the eastern long‐necked turtle (Chelodina longicollis) in Australia over 1 year in a suburban environment and an adjacent nature reserve during drought. Contrary to expectations, sex ratios, injury incidence, and frequency of juvenile size classes did not differ between turtles in the suburbs and the nature reserve. Moreover, turtles in the suburbs were nearly 3 times more abundant, grew 5 times faster, and had populations comprised of more adults in the larger size classes than nature reserve populations. These findings, together with net movements from the nature reserves into the suburbs, suggest that suburban water bodies were the higher quality habitat, effectively buffering turtles from temporal fluctuations in environmental conditions during drought. However, reserve managers and urban planners need to recognize that suburban water bodies have the potential to attract turtles from nearby reserves during drought, and that even low levels of persistent mortality during these travels across reserve boundaries may have consequences for populations of long‐lived vertebrates. © 2011 The Wildlife Society.

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Section: Methodsmentioning

confidence: 99%

Suburbs: dangers or drought refugia for freshwater turtle populations?

2011

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“…Georges et al (1986) found that within the confines of carnivory, there was no evidence that C. longicollis were selective, and Chessman (1984b) observed that carrion and invertebrates formed a large proportion of the diet of adults. In contrast, E. macquarii taxa are primarily omnivorous (Chessman, 1978(Chessman, , 1984bGeorges, 1982).…”

Section: Discussionmentioning

confidence: 96%

Comparison of sympatric freshwater turtle populations from an urbanized Sydney catchment

Burgin

Ryan

2008

Aquatic Conservation

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ABSTRACT1. Australian freshwater turtles are widely distributed throughout the continent, and in each river catchment there are at least two taxa. In south-eastern Australia Chelodina longicollis and forms of Emydura macquarii cohabit within a waterway, although they have been shown to partition habitat within the water column in nonurban bodies of water. Limited comparative data are available for the urban populations.2. Within urban Sydney C. longicollis (eastern long-necked turtle) and Emydura macquarii dharuk (Sydney short-necked turtle) share habitat. However, in contrast with non-urban studies of C. longicollis and other sympatric E. macquarii taxa, it was observed that the population profile of the two species was similar at all sites, and that C. longicollis were present in greater numbers than E. m. dharuk.3. The continued degradation of preferred habitat, low recruitment, and potential competition from introduced turtles place both species in a precarious position.4. The shallow, impounded waterways of the regulated urban bodies of water align more closely with the preferred habitat of C. longicollis than with that of forms of E. macquarii, which prefer deeper flowing waters or large wetlands adjacent to rivers. Emydura m. dharuk may be at greatest risk of extinction in urban areas.5. Across urban Sydney, the low numbers of E. m. dharuk compared with C. longicollis may be due to the lack of mobility of E. m. dharuk such that individuals tend to be stranded in sub-optimal habitat. In contrast, C. longicollis has a greater propensity for overland movement, and a preference for the 'new habitat' resulting from urban impacts on the associated waterways, and thus appears to be able to utilize these modified urban waters more successfully.

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“…Carettochelys insculpta, Phrynops geoffroanus) (Georges, Norris and Wensing, 1986;Allanson and Georges, 1999;Zug, Vitt and Caldwell, 2001;Mushinsky, Stilson and McCoy, 2003;Souza, 2004;Loehr, 2006). The diet of freshwater carnivorous turtles includes insects (and their aquatic larvae), annelids, gastropods, fishes, amphibians, and even carrion (Georges, 1982;Georges, Norris and Wensing, 1986;Souza and Abe, 1995, 1997a, 1998Allanson and Georges, 1999;Cooley et al, 2003;Aguirre León and Aquino Cruz, 2004;Souza, 2004). Some turtle species consume food according to its local availability, and are therefore regarded as opportunist; other species behave as selective and specialized predators, using resources disproportionately according to availability (Georges, Norris and Wensing, 1986;Tucker, Fitzsimmons and Gibbons, 1995;Souza and Abe, 2000;Souza, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…Chelodina expansa, C. longicollis, Chelus fimbriatus, Hydromedusa maximiliani, Pseudemydura umbrina); there are also species than can be omnivorous (i.e. Carettochelys insculpta, Phrynops geoffroanus) (Georges, Norris and Wensing, 1986;Allanson and Georges, 1999;Zug, Vitt and Caldwell, 2001;Mushinsky, Stilson and McCoy, 2003;Souza, 2004;Loehr, 2006). The diet of freshwater carnivorous turtles includes insects (and their aquatic larvae), annelids, gastropods, fishes, amphibians, and even carrion (Georges, 1982;Georges, Norris and Wensing, 1986;Souza and Abe, 1995, 1997a, 1998Allanson and Georges, 1999;Cooley et al, 2003;Aguirre León and Aquino Cruz, 2004;Souza, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…The diet of freshwater carnivorous turtles includes insects (and their aquatic larvae), annelids, gastropods, fishes, amphibians, and even carrion (Georges, 1982;Georges, Norris and Wensing, 1986;Souza and Abe, 1995, 1997a, 1998Allanson and Georges, 1999;Cooley et al, 2003;Aguirre León and Aquino Cruz, 2004;Souza, 2004). Some turtle species consume food according to its local availability, and are therefore regarded as opportunist; other species behave as selective and specialized predators, using resources disproportionately according to availability (Georges, Norris and Wensing, 1986;Tucker, Fitzsimmons and Gibbons, 1995;Souza and Abe, 2000;Souza, 2004). In addition, there are often ontogenic (Tucker, Fitzsimmons and Gibbons, 1995;Souza, 2004) and seasonal (Souza and Abe, 1997b) differences in diet composition among turtles of a single species.…”

Section: Introductionmentioning

confidence: 99%

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Diet of Hydromedusa tectifera (Testudines-Chelidae) in a mountain stream of Córdoba province, Argentina

et al. 2009

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The diet of Hydromedusa tectifera occurring in two mountain streams in the province of Córdoba is described through a comparative analysis of 154 individuals. Turtles were manually captured between August 2005 and August 2006 from streams at the localities of Tanti and Flor Serrana. Before being released, turtles were stomach-flushed, and sex and carapace length were recorded. The stomach contents were observed under stereomicroscope; prey items were identified and classified according to size and volume. The importance of the different items was quantified using the Index of Relative Importance (IRI). Similarity in the diet between sexes and among size classes and seasons of an annual cycle was evaluated using the simplified Morisita index. Trophic breadth was estimated with the Shannon diversity index. Detrended Correspondence Analysis (DCA) was used to evaluate differences in the diet between categories (sex, size classes). Fortyseven food items belonging to the following taxa were identified: leeches, annelids, gastropods, arachnids, insects, and fishes. According to the IRI value, the most important items in the diet of H. tectifera were larvae of Trichoptera (IRI = 33.5), fishes (IRI = 30), and naiads of Odonata (IRI = 25.2). The relative importance of the items varied with size of turtles but not with sex. Size of prey consumed increased with increasing turtle size. A greater trophic breadth was observed in smaller individuals.

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Diet of the Fresh-Water Turtle Chelodina-Longicollis (Testudines, Chelidae) From the Coastal Dune Lakes of the Jervis Bay Territory

Cited by 43 publications

References 15 publications

Suburbs: dangers or drought refugia for freshwater turtle populations?

Suburbs: dangers or drought refugia for freshwater turtle populations?

Comparison of sympatric freshwater turtle populations from an urbanized Sydney catchment

Diet of Hydromedusa tectifera (Testudines-Chelidae) in a mountain stream of Córdoba province, Argentina

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