Abstract Hatchling river turtles (Smooth Softshell Turtles, Apalone mutica; Spiny Softshell Turtles, Apalone spinifera; Northern Map Turtles, Graptemys geographica; False Map Turtles, Graptemys pseudogeographica; and Ouachita Map Turtles, Graptemys ouachitensis) were released in a variety of settings to help place orientation and dispersal from nests in the context of nest site selection by females and juvenile recruitment habitat. Visual cues associated with near open or far dark horizons were the primary environmental cues used during initial orientation and dispersal of the hatchling river turtles. On a river beach, hatchlings of both species of Softshell Turtles dispersed toward the open horizon of the nearby river. In contrast, hatchlings of all 3 species of Map Turtles on the same beach dispersed toward the near dark horizons of a forest that led them away from the river. Hatchling Map Turtles of all 3 species released in autumn and Northern Map Turtles also released in spring at a field arena dispersed toward near dark horizons of pine (Pinus spp.) and deciduous trees to the north and south of the arena (directions that were parallel to the Mississippi River). At a site in upland prairie habitat with no nearby wetlands, hatchlings of all 3 species of Map Turtles dispersed to the north toward near dark horizons of an oak (Quercus spp.) forest rather than toward more distant dark horizons of mixed oak and pine trees. At a lowland prairie site where no near dark horizon was visible, Northern Map Turtles dispersed toward 2 far dark horizons that were ∼ 230 m to the north (a pond surrounded with trees) and to the south (an area of large deciduous trees at the west end of a windrow of pine trees), but not toward the large riparian wetland 280 m to the west. The bimodal dispersal pattern toward 2 equidistant dark horizons within 230 m but not toward the riparian area 280 m to the west suggests that the perception distance for hatchling Northern Map Turtles is between 230 and 280 m. Dispersal of a combined sample of naïve hatchling False Map and Ouachita Map Turtles released in a mature corn field was not different from random, but the directions taken by the majority of hatchlings were to the north and south across corn rows that may be the closest match to dark horizons used for dispersal in typical habitats.
{"title":"Orientation in Five Species of Hatchling River Turtles Dispersing from Experimental Nests","authors":"Michael J. Pappas, J. Congdon, Bruce J. Brecke","doi":"10.2744/CCB-1234.1","DOIUrl":"https://doi.org/10.2744/CCB-1234.1","url":null,"abstract":"Abstract Hatchling river turtles (Smooth Softshell Turtles, Apalone mutica; Spiny Softshell Turtles, Apalone spinifera; Northern Map Turtles, Graptemys geographica; False Map Turtles, Graptemys pseudogeographica; and Ouachita Map Turtles, Graptemys ouachitensis) were released in a variety of settings to help place orientation and dispersal from nests in the context of nest site selection by females and juvenile recruitment habitat. Visual cues associated with near open or far dark horizons were the primary environmental cues used during initial orientation and dispersal of the hatchling river turtles. On a river beach, hatchlings of both species of Softshell Turtles dispersed toward the open horizon of the nearby river. In contrast, hatchlings of all 3 species of Map Turtles on the same beach dispersed toward the near dark horizons of a forest that led them away from the river. Hatchling Map Turtles of all 3 species released in autumn and Northern Map Turtles also released in spring at a field arena dispersed toward near dark horizons of pine (Pinus spp.) and deciduous trees to the north and south of the arena (directions that were parallel to the Mississippi River). At a site in upland prairie habitat with no nearby wetlands, hatchlings of all 3 species of Map Turtles dispersed to the north toward near dark horizons of an oak (Quercus spp.) forest rather than toward more distant dark horizons of mixed oak and pine trees. At a lowland prairie site where no near dark horizon was visible, Northern Map Turtles dispersed toward 2 far dark horizons that were ∼ 230 m to the north (a pond surrounded with trees) and to the south (an area of large deciduous trees at the west end of a windrow of pine trees), but not toward the large riparian wetland 280 m to the west. The bimodal dispersal pattern toward 2 equidistant dark horizons within 230 m but not toward the riparian area 280 m to the west suggests that the perception distance for hatchling Northern Map Turtles is between 230 and 280 m. Dispersal of a combined sample of naïve hatchling False Map and Ouachita Map Turtles released in a mature corn field was not different from random, but the directions taken by the majority of hatchlings were to the north and south across corn rows that may be the closest match to dark horizons used for dispersal in typical habitats.","PeriodicalId":50703,"journal":{"name":"Chelonian Conservation and Biology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2017-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2744/CCB-1234.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43623620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract The diamond-backed terrapin (Malaclemys terrapin) is the only North American turtle species specialized for living in brackish and saltmarsh environments. The Texas subspecies (Malaclemys terrapin littoralis) is found along most of the Texas Gulf Coast. Previous studies on the prey and diets of Atlantic and Florida subspecies found that the diet of terrapins primarily consisted of crustacean and molluscan species, although differences in dietary composition were observed between the sexes. Furthermore, prey availability had little effect on terrapin distribution within a marsh. We examined the prey availability and diet of Texas diamond-backed terrapins. Comparisons of random locations to terrapin capture locations indicated that prey availability is not a limiting factor affecting terrapin distribution in Texas marshes, but multiple significant seasonal and locational differences in prey were detected at capture sites. Fecal analysis, using multiple metrics, indicated Gastropoda and Decapoda as major components of the diets of Texas terrapins. Plicate horn snails (Cerithidea pliculosa) and fiddler crabs (Uca spp.) were important prey items for all terrapins. There were significant differences between the diets of male and female terrapins, among seasonal diets, and among diets of terrapins captured at different marsh sites. Our prey availability findings support previous studies, but results from fecal analysis indicate a slightly different diet for terrapins than previously reported in other studies. The combined results extend the basic knowledge and understanding of terrapin diets, which will be useful for ongoing conservation and management of M. terrapin, especially the Texas subspecies.
{"title":"Prey Availability and Diet Analysis of Texas Diamond-Backed Terrapin (Malaclemys terrapin littoralis)","authors":"Bryan J. Alleman, G. Guillen","doi":"10.2744/CCB-1228.1","DOIUrl":"https://doi.org/10.2744/CCB-1228.1","url":null,"abstract":"Abstract The diamond-backed terrapin (Malaclemys terrapin) is the only North American turtle species specialized for living in brackish and saltmarsh environments. The Texas subspecies (Malaclemys terrapin littoralis) is found along most of the Texas Gulf Coast. Previous studies on the prey and diets of Atlantic and Florida subspecies found that the diet of terrapins primarily consisted of crustacean and molluscan species, although differences in dietary composition were observed between the sexes. Furthermore, prey availability had little effect on terrapin distribution within a marsh. We examined the prey availability and diet of Texas diamond-backed terrapins. Comparisons of random locations to terrapin capture locations indicated that prey availability is not a limiting factor affecting terrapin distribution in Texas marshes, but multiple significant seasonal and locational differences in prey were detected at capture sites. Fecal analysis, using multiple metrics, indicated Gastropoda and Decapoda as major components of the diets of Texas terrapins. Plicate horn snails (Cerithidea pliculosa) and fiddler crabs (Uca spp.) were important prey items for all terrapins. There were significant differences between the diets of male and female terrapins, among seasonal diets, and among diets of terrapins captured at different marsh sites. Our prey availability findings support previous studies, but results from fecal analysis indicate a slightly different diet for terrapins than previously reported in other studies. The combined results extend the basic knowledge and understanding of terrapin diets, which will be useful for ongoing conservation and management of M. terrapin, especially the Texas subspecies.","PeriodicalId":50703,"journal":{"name":"Chelonian Conservation and Biology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2017-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2744/CCB-1228.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43404965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aubrey Frye, Kate Hardy, Ashley R Hedrick, J. Iverson
Abstract Although general descriptions of nesting in painted turtles (Chrysemys picta) are numerous, few studies have quantified the timing of the components of the nesting process, and no previous study has analyzed the factors influencing those times. The present study was conducted on the Crescent Lake National Wildlife Refuge in Garden County, Nebraska, in June 2012 and 2013 and focused on a single nesting population of female C. picta. We recorded times for the initiation of the nest foray, and the beginning and conclusion of nesting, and calculated search and construction times. Although highly variable, on average females left the marsh at 1709 hrs (n = 130), began nesting at 1745 hrs (n = 141), and finished nesting at 1915 hrs (n = 135). Search time averaged 26 min (n = 79) and nest construction time averaged 97 min (n = 104). We investigated the effects of female body size, air temperature, time of day, nest day, clutch number, substrate type, and reproductive output on these times. Smaller females nested earlier in the day, construction times were shorter in warmer temperatures, nests begun earlier in the day were completed more quickly, and nest times were longer earlier in the season and for first vs. second clutches. Soil type and measures of reproductive output had no effects on nesting times. These results suggest that temperature is a primary driver of nesting times, as these turtles exploit the afternoon–evening window of optimal temperatures, avoiding heat stress earlier in the afternoon and much colder evening temperatures as well as a presumed increase in predation risk after dark.
尽管对彩龟筑巢的一般描述很多，但很少有研究量化了筑巢过程中各个组成部分的时间，而且之前也没有研究分析过影响这些时间的因素。本研究于2012年6月和2013年6月在美国内布拉斯加州加登县新月湖国家野生动物保护区进行，研究对象为单巢雌picta。我们记录了开始筑巢的时间，以及筑巢开始和结束的时间，并计算了搜索和建造的时间。虽然变化很大，但雌性平均在1709小时(n = 130)离开沼泽，1745小时(n = 141)开始筑巢，1915小时(n = 135)完成筑巢。平均搜索时间26 min (n = 79)，平均筑巢时间97 min (n = 104)。我们研究了雌性体型、气温、一天中的时间、筑巢日、产卵数、基质类型和繁殖量对这些时间的影响。体型较小的雌鸟筑巢时间较早，在温暖的温度下筑巢时间较短，筑巢时间较早，筑巢时间较长，筑巢时间较早，第一次与第二次产卵的时间较早。土壤类型和繁殖产量对筑巢时间没有影响。这些结果表明，温度是筑巢时间的主要驱动因素，因为这些海龟利用下午到晚上的最佳温度窗口，避免了下午早些时候的热应激和晚上更冷的温度，以及天黑后可能增加的捕食风险。
{"title":"Factors Affecting Nesting Times in the Painted Turtle Chrysemys picta in Nebraska","authors":"Aubrey Frye, Kate Hardy, Ashley R Hedrick, J. Iverson","doi":"10.2744/CCB-1208.1","DOIUrl":"https://doi.org/10.2744/CCB-1208.1","url":null,"abstract":"Abstract Although general descriptions of nesting in painted turtles (Chrysemys picta) are numerous, few studies have quantified the timing of the components of the nesting process, and no previous study has analyzed the factors influencing those times. The present study was conducted on the Crescent Lake National Wildlife Refuge in Garden County, Nebraska, in June 2012 and 2013 and focused on a single nesting population of female C. picta. We recorded times for the initiation of the nest foray, and the beginning and conclusion of nesting, and calculated search and construction times. Although highly variable, on average females left the marsh at 1709 hrs (n = 130), began nesting at 1745 hrs (n = 141), and finished nesting at 1915 hrs (n = 135). Search time averaged 26 min (n = 79) and nest construction time averaged 97 min (n = 104). We investigated the effects of female body size, air temperature, time of day, nest day, clutch number, substrate type, and reproductive output on these times. Smaller females nested earlier in the day, construction times were shorter in warmer temperatures, nests begun earlier in the day were completed more quickly, and nest times were longer earlier in the season and for first vs. second clutches. Soil type and measures of reproductive output had no effects on nesting times. These results suggest that temperature is a primary driver of nesting times, as these turtles exploit the afternoon–evening window of optimal temperatures, avoiding heat stress earlier in the afternoon and much colder evening temperatures as well as a presumed increase in predation risk after dark.","PeriodicalId":50703,"journal":{"name":"Chelonian Conservation and Biology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2017-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2744/CCB-1208.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46477775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.2744/1071-8443-16.1.110
Editorial Introduction. — This section is devoted to poetry involving turtles, representing either reprinted previously published or new unpublished material. We encourage our readers to submit poetry or songs for consideration, either their own material or work by other authors. Poems may be submitted to Anders G.J. Rhodin, Chelonian Research Foundation, E-mail: RhodinCRF@aol.com. Our desire is to share with our readers the beauty and wonder of turtles as expressed through the art of the poem or song. In the sense that the relationship between man and turtles is multifaceted, so too is turtle poetry. The poems we publish here will reflect that complexity, from poems of pure admiration for the creatures themselves to others reflecting the utilization of turtles and their products. Some poems will reflect man’s use of the turtle for sustenance, others will stress man’s need to preserve and protect turtles. Some will deal with our emotional interactions with turtles, others will treat turtles light-heartedly or with seeming disrespect, but all will hopefully help us to better understand both the human and the chelonian condition, and remind us that the turtle holds a sacred place in all our hearts.
{"title":"Chelonian Epitaph","authors":"","doi":"10.2744/1071-8443-16.1.110","DOIUrl":"https://doi.org/10.2744/1071-8443-16.1.110","url":null,"abstract":"Editorial Introduction. — This section is devoted to poetry involving turtles, representing either reprinted previously published or new unpublished material. We encourage our readers to submit poetry or songs for consideration, either their own material or work by other authors. Poems may be submitted to Anders G.J. Rhodin, Chelonian Research Foundation, E-mail: RhodinCRF@aol.com. Our desire is to share with our readers the beauty and wonder of turtles as expressed through the art of the poem or song. In the sense that the relationship between man and turtles is multifaceted, so too is turtle poetry. The poems we publish here will reflect that complexity, from poems of pure admiration for the creatures themselves to others reflecting the utilization of turtles and their products. Some poems will reflect man’s use of the turtle for sustenance, others will stress man’s need to preserve and protect turtles. Some will deal with our emotional interactions with turtles, others will treat turtles light-heartedly or with seeming disrespect, but all will hopefully help us to better understand both the human and the chelonian condition, and remind us that the turtle holds a sacred place in all our hearts.","PeriodicalId":50703,"journal":{"name":"Chelonian Conservation and Biology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69178798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.2744/1071-8443-16.2.255
Editorial Introduction. — This section is devoted to poetry involving turtles, representing either reprinted previously published or new unpublished material. We encourage our readers to submit poetry or songs for consideration, either their own material or work by other authors. Poems may be submitted to Anders G.J. Rhodin, Chelonian Research Foundation, E-mail: RhodinCRF@aol.com. Our desire is to share with our readers the beauty and wonder of turtles as expressed through the art of the poem or song. In the sense that the relationship between man and turtles is multifaceted, so too is turtle poetry. The poems we publish here will reflect that complexity, from poems of pure admiration for the creatures themselves to others reflecting the utilization of turtles and their products. Some poems will reflect man’s use of the turtle for sustenance, others will stress man’s need to preserve and protect turtles. Some will deal with our emotional interactions with turtles, others will treat turtles light-heartedly or with seeming disrespect, but all will hopefully help us to better understand both the human and the chelonian condition, and remind us that the turtle holds a sacred place in all our hearts.
{"title":"Turtle in the Road","authors":"","doi":"10.2744/1071-8443-16.2.255","DOIUrl":"https://doi.org/10.2744/1071-8443-16.2.255","url":null,"abstract":"Editorial Introduction. — This section is devoted to poetry involving turtles, representing either reprinted previously published or new unpublished material. We encourage our readers to submit poetry or songs for consideration, either their own material or work by other authors. Poems may be submitted to Anders G.J. Rhodin, Chelonian Research Foundation, E-mail: RhodinCRF@aol.com. Our desire is to share with our readers the beauty and wonder of turtles as expressed through the art of the poem or song. In the sense that the relationship between man and turtles is multifaceted, so too is turtle poetry. The poems we publish here will reflect that complexity, from poems of pure admiration for the creatures themselves to others reflecting the utilization of turtles and their products. Some poems will reflect man’s use of the turtle for sustenance, others will stress man’s need to preserve and protect turtles. Some will deal with our emotional interactions with turtles, others will treat turtles light-heartedly or with seeming disrespect, but all will hopefully help us to better understand both the human and the chelonian condition, and remind us that the turtle holds a sacred place in all our hearts.","PeriodicalId":50703,"journal":{"name":"Chelonian Conservation and Biology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69178829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Depredation rates on turtle nests can be very high, resulting in low recruitment to populations. Understanding predator foraging habits and nesting ecology of turtles is essential for the long-term management of threatened turtle species. Cues used by predators to locate wood turtle (Glyptemys insculpta) nests were investigated by creating simulated nests with 1 of 4 treatments: soil disturbance, water with turtle scent, soil disturbance plus turtle scent, or distilled water. Nest predators primarily used soil disturbance cues for locating nests. Additionally, artificial nests with buried chicken eggs were created at varying distances from the river and monitored for predation. Nest predation decreased as nest distance from the river increased. These data can be used to develop strategies for more effective management of this threatened species.
{"title":"Factors Affecting Predation on Wood Turtle (Glyptemys insculpta) Nests in the Upper Peninsula of Michigan","authors":"Jenny L. Rutherford, G. Casper, B. Graves","doi":"10.2744/CCB-1180.1","DOIUrl":"https://doi.org/10.2744/CCB-1180.1","url":null,"abstract":"Abstract Depredation rates on turtle nests can be very high, resulting in low recruitment to populations. Understanding predator foraging habits and nesting ecology of turtles is essential for the long-term management of threatened turtle species. Cues used by predators to locate wood turtle (Glyptemys insculpta) nests were investigated by creating simulated nests with 1 of 4 treatments: soil disturbance, water with turtle scent, soil disturbance plus turtle scent, or distilled water. Nest predators primarily used soil disturbance cues for locating nests. Additionally, artificial nests with buried chicken eggs were created at varying distances from the river and monitored for predation. Nest predation decreased as nest distance from the river increased. These data can be used to develop strategies for more effective management of this threatened species.","PeriodicalId":50703,"journal":{"name":"Chelonian Conservation and Biology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2016-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2744/CCB-1180.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69179339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Andrew J. Heaton, Eric E. Pulis, J. Pitchford, Wendy Hatchett, A. Carron, Moby A Solangi
Abstract In the northern Gulf of Mexico, Kemp's ridley sea turtles (Lepidochelys kempii) are incidentally captured by recreational anglers. While sea turtle bycatch is of conservation concern, most studies focus on commercial fisheries, and the number and proportion of turtles affected by recreational fisheries interactions is not known. This study aimed to quantify the proportion of turtles in the Mississippi Sound with evidence of previous interactions with anglers. We analyzed radiographs of hook-and-line captured sea turtles in rehabilitation for number of hooks present, location of hooks, and number of associated hook interactions. The presence of ingested hooks in a number of the rehabilitated L. kempii also allowed us to report on hook transience through observations in rehabilitation, including how transit time related to turtle size, hook size, and position within the gastrointestinal tract. From 2012 to 2015, 882 L. kempii were radiographed. Hooks from prior interactions were found in 12.5% of our total sample. Carapace length was not significantly related to the probability of gear presence, though carapace length did account for 21.9% of the variation of hook sizes in our sample. Transit times were recorded for 50 successfully expelled hooks. Average transit times were 13.50, 8.40, and 4.48 d for the upper, middle, and lower gastrointestinal tract, respectively. Multiple linear regression models showed that transit time was not related to hook or turtle size. This information can be used to inform sea turtle rehabilitation, conservation, and management decisions while highlighting the need for a better understanding of interactions between sea turtles and recreational fisheries.
{"title":"Prevalence and Transience of Ingested Fishing Hooks in Kemp's Ridley Sea Turtles","authors":"Andrew J. Heaton, Eric E. Pulis, J. Pitchford, Wendy Hatchett, A. Carron, Moby A Solangi","doi":"10.2744/CCB-1227.1","DOIUrl":"https://doi.org/10.2744/CCB-1227.1","url":null,"abstract":"Abstract In the northern Gulf of Mexico, Kemp's ridley sea turtles (Lepidochelys kempii) are incidentally captured by recreational anglers. While sea turtle bycatch is of conservation concern, most studies focus on commercial fisheries, and the number and proportion of turtles affected by recreational fisheries interactions is not known. This study aimed to quantify the proportion of turtles in the Mississippi Sound with evidence of previous interactions with anglers. We analyzed radiographs of hook-and-line captured sea turtles in rehabilitation for number of hooks present, location of hooks, and number of associated hook interactions. The presence of ingested hooks in a number of the rehabilitated L. kempii also allowed us to report on hook transience through observations in rehabilitation, including how transit time related to turtle size, hook size, and position within the gastrointestinal tract. From 2012 to 2015, 882 L. kempii were radiographed. Hooks from prior interactions were found in 12.5% of our total sample. Carapace length was not significantly related to the probability of gear presence, though carapace length did account for 21.9% of the variation of hook sizes in our sample. Transit times were recorded for 50 successfully expelled hooks. Average transit times were 13.50, 8.40, and 4.48 d for the upper, middle, and lower gastrointestinal tract, respectively. Multiple linear regression models showed that transit time was not related to hook or turtle size. This information can be used to inform sea turtle rehabilitation, conservation, and management decisions while highlighting the need for a better understanding of interactions between sea turtles and recreational fisheries.","PeriodicalId":50703,"journal":{"name":"Chelonian Conservation and Biology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2016-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2744/CCB-1227.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69180393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Iverson, Hanna Klondaris, Christopher S. Angell, Wendy P. Tori
Abstract Nest-site choice in turtles has a demonstrated impact on their fitness. Previous studies of nest-site choice have focused on environmental factors potentially affecting that choice (e.g., temperature, insolation, soil type, or moisture). Observations of nesting of painted turtles (Chrysemys picta) at the Crescent Lake National Wildlife Refuge in the Nebraska Sandhills suggest that females might use olfactory cues (specifically odors of other nesting females) to choose nest sites. We tested this hypothesis indirectly by using the nearest neighbor (nest) distance algorithm in ArcMap 10.1. Our results for nests in 2012–2014 were mixed, with nesting at some sites, in some years, and by some turtles occurring nonrandomly, in very close proximity to previous nests. Preliminary experimental data from 2015 using urine-treated sites in primary nesting areas also suggested that females showed more interest in those sites than sites moistened with equal amounts of water. These data provide some support for the use of nest odor as an important cue for nest-site choice in turtles, but they are insufficient to reject the possibility of the simultaneous use of other fine-scale environmental cues.
{"title":"Olfaction as a Cue for Nest-Site Choice in Turtles","authors":"J. Iverson, Hanna Klondaris, Christopher S. Angell, Wendy P. Tori","doi":"10.2744/CCB-1199.1","DOIUrl":"https://doi.org/10.2744/CCB-1199.1","url":null,"abstract":"Abstract Nest-site choice in turtles has a demonstrated impact on their fitness. Previous studies of nest-site choice have focused on environmental factors potentially affecting that choice (e.g., temperature, insolation, soil type, or moisture). Observations of nesting of painted turtles (Chrysemys picta) at the Crescent Lake National Wildlife Refuge in the Nebraska Sandhills suggest that females might use olfactory cues (specifically odors of other nesting females) to choose nest sites. We tested this hypothesis indirectly by using the nearest neighbor (nest) distance algorithm in ArcMap 10.1. Our results for nests in 2012–2014 were mixed, with nesting at some sites, in some years, and by some turtles occurring nonrandomly, in very close proximity to previous nests. Preliminary experimental data from 2015 using urine-treated sites in primary nesting areas also suggested that females showed more interest in those sites than sites moistened with equal amounts of water. These data provide some support for the use of nest odor as an important cue for nest-site choice in turtles, but they are insufficient to reject the possibility of the simultaneous use of other fine-scale environmental cues.","PeriodicalId":50703,"journal":{"name":"Chelonian Conservation and Biology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2016-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2744/CCB-1199.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69180400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract This work describes the mycelial fungal diversity associated with leatherback sea turtle nests and eggs from Mayagüez-Añasco Bay Coast (MABC), Puerto Rico. Comparisons are made of conditions previous to leatherback nesting season, during leatherback nesting season, and during nest hatching season. Prior to Dermochelys coriacea nesting season, the fungal community along the MABC showed a normal distribution (p = 0.098) by One-Way ANOVA. We found that Aspergillus was the most frequent genus (0.15), followed by Cladosporium (0.09) and Curvularia (0.08). At the time of oviposition, Penicillium was the most frequent isolate (0.15), followed by Cladosporium (0.11), Aspergillus (0.11), and Fusarium (0.07). No fungi were isolated from nesting leatherback's ovipositor samples. During hatching season, fungal diversity was evaluated from the sand of hatched nests and from failed eggs. Fusarium solani was the most frequent isolate (0.57) from hatched nest sand and was the only species isolated from the interior of failed eggs. A strong positive correlation was obtained between fungal abundance and the number of failed eggs in the nests (r = 0.853, p < 0.001). This was the first attempt to study fungal diversity associated with D. coriacea nests and eggs in Puerto Rico.
摘要:本研究描述了波多黎各Mayagüez-Añasco Bay Coast (MABC)棱皮海龟巢和卵的菌丝真菌多样性。比较了棱皮龟筑巢季节之前、筑巢季节期间和巢孵化季节的条件。在革螨筑巢季节前，经单因素方差分析，真菌群落沿MABC呈正态分布(p = 0.098)。以曲霉属(Aspergillus)最多，为0.15，其次为枝孢霉属(Cladosporium)，为0.09，曲霉属(Curvularia)为0.08。产卵时以青霉菌最多(0.15)，其次是枝孢菌(0.11)、曲霉菌(0.11)和镰刀菌(0.07)。没有真菌从筑巢棱皮龟的产卵器样本中分离出来。在孵化季节，从孵化巢的沙子和失败的卵中评估真菌多样性。在孵化的巢沙中分离到的镰刀菌最多(0.57)，是唯一从失败卵内部分离到的菌种。真菌丰度与巢内失败卵数呈极显著正相关(r = 0.853, p < 0.001)。这是第一次尝试研究波多黎各与D. coriacea巢穴和卵相关的真菌多样性。
{"title":"Mycelial Fungal Diversity Associated with the Leatherback Sea Turtle (Dermochelys coriacea) Nests from Western Puerto Rico","authors":"G. Rosado-Rodríguez, Sandra L. Maldonado-Ramírez","doi":"10.2744/CCB-1217.1","DOIUrl":"https://doi.org/10.2744/CCB-1217.1","url":null,"abstract":"Abstract This work describes the mycelial fungal diversity associated with leatherback sea turtle nests and eggs from Mayagüez-Añasco Bay Coast (MABC), Puerto Rico. Comparisons are made of conditions previous to leatherback nesting season, during leatherback nesting season, and during nest hatching season. Prior to Dermochelys coriacea nesting season, the fungal community along the MABC showed a normal distribution (p = 0.098) by One-Way ANOVA. We found that Aspergillus was the most frequent genus (0.15), followed by Cladosporium (0.09) and Curvularia (0.08). At the time of oviposition, Penicillium was the most frequent isolate (0.15), followed by Cladosporium (0.11), Aspergillus (0.11), and Fusarium (0.07). No fungi were isolated from nesting leatherback's ovipositor samples. During hatching season, fungal diversity was evaluated from the sand of hatched nests and from failed eggs. Fusarium solani was the most frequent isolate (0.57) from hatched nest sand and was the only species isolated from the interior of failed eggs. A strong positive correlation was obtained between fungal abundance and the number of failed eggs in the nests (r = 0.853, p < 0.001). This was the first attempt to study fungal diversity associated with D. coriacea nests and eggs in Puerto Rico.","PeriodicalId":50703,"journal":{"name":"Chelonian Conservation and Biology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2016-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2744/CCB-1217.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69180742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Overwintering behavior of diamond-backed terrapin (Malaclemys terrapin) hatchlings is highly unusual; a substantial percentage of hatchlings leave nests in the fall, travel overland, and rebury themselves on land farther from water. Many aspects of this behavior are poorly documented and conflicting. We tracked 81 newly emerged M. terrapin hatchlings from their nest sites in Jamaica Bay, New York, to their overwintering refugia and until spring/summer emergence. Hatchling M. terrapin used the wrack line only as short-term cover before moving upland and burying themselves in terrestrial refugia. Hatchling refugia depths were variable, up to 10 cm deep, with some vertical movement seasonally. Hatchlings selected winter refugia with relatively high levels of vegetative cover; in this way, overwintering sites differed substantially from temporary refugia. Hatchlings emerged from overwintering refugia between 17 March and 7 July following fall emergence. Our observations better characterize what may be a unique behavior among turtles, but any adaptive value remains obscure.
{"title":"Dispersal of Newly Emerged Diamond-Backed Terrapin (Malaclemys terrapin) Hatchlings at Jamaica Bay, New York","authors":"N. Duncan, R. Burke","doi":"10.2744/CCB-1207.1","DOIUrl":"https://doi.org/10.2744/CCB-1207.1","url":null,"abstract":"Abstract Overwintering behavior of diamond-backed terrapin (Malaclemys terrapin) hatchlings is highly unusual; a substantial percentage of hatchlings leave nests in the fall, travel overland, and rebury themselves on land farther from water. Many aspects of this behavior are poorly documented and conflicting. We tracked 81 newly emerged M. terrapin hatchlings from their nest sites in Jamaica Bay, New York, to their overwintering refugia and until spring/summer emergence. Hatchling M. terrapin used the wrack line only as short-term cover before moving upland and burying themselves in terrestrial refugia. Hatchling refugia depths were variable, up to 10 cm deep, with some vertical movement seasonally. Hatchlings selected winter refugia with relatively high levels of vegetative cover; in this way, overwintering sites differed substantially from temporary refugia. Hatchlings emerged from overwintering refugia between 17 March and 7 July following fall emergence. Our observations better characterize what may be a unique behavior among turtles, but any adaptive value remains obscure.","PeriodicalId":50703,"journal":{"name":"Chelonian Conservation and Biology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2016-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2744/CCB-1207.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69180483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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