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Western Hognose Snakes ( Heterodon nasicus) Prefer Environmental Enrichment. Animals (Basel) 2022; 12:ani12233347. [PMID: 36496867 PMCID: PMC9739432 DOI: 10.3390/ani12233347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 11/24/2022] [Accepted: 11/25/2022] [Indexed: 12/03/2022] Open
Abstract
The environmental enrichment needs of snakes are often disregarded. Using preference testing, we aimed to shed light on the enrichment preferences of a popular pet species, the western hognose snake (Heterodon nasicus). Snakes' enclosures were divided into enriched and standard sides. The enriched half had substrate for burrowing, interactive stimuli, and a large water dish. The standard half had paper towel substrate and a small water dish. Each side also contained a single shelter. We provided belly heat to create a thermal gradient on one side of the cage. Snakes were observed for 6 days, four times daily. We predicted a preference for enriched conditions and, as snakes are ectothermic, a preference for the warmer side. Snakes were additionally given an exploration assay, to explore whether differences in preference for environmental enrichment interact with boldness levels. We found that hognose snakes preferred enrichment, and the strength of this preference increased over time. Preference for enrichment was stronger when the enriched side was cooler. This may be due to the burrowing tendencies of these snakes. We found no relationship between preference and boldness. These findings emphasise the importance of preference testing in establishing research-informed enrichment opportunities for reptiles.
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Farmer CG. Parental Care, Destabilizing Selection, and the Evolution of Tetrapod Endothermy. Physiology (Bethesda) 2020; 35:160-176. [PMID: 32293231 DOI: 10.1152/physiol.00058.2018] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Parental care has evolved convergently an extraordinary number of times among tetrapods that reproduce terrestrially, suggesting strong positive selection for this behavior in the terrestrial environment. This review speculates that destabilizing selection on parental care, and especially embryo incubation, drove the convergent evolution of many tetrapod traits, including endothermy.
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Affiliation(s)
- C G Farmer
- Trinity College Dublin, Dublin, Ireland; and University of Utah, Salt Lake City, Utah
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3
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Alexander GJ. Reproductive biology and maternal care of neonates in southern African python (Python natalensis). J Zool (1987) 2018. [DOI: 10.1111/jzo.12554] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- G. J. Alexander
- School of Animal, Plant and Environmental Sciences; University of the Witwatersrand; Johannesburg South Africa
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Loehr VJT. Thermoregulatory challenges in the habitat of the world's smallest tortoise, Chersobius signatus. J Therm Biol 2018; 71:62-68. [PMID: 29301701 DOI: 10.1016/j.jtherbio.2017.10.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Revised: 10/28/2017] [Accepted: 10/30/2017] [Indexed: 11/30/2022]
Abstract
Ectotherms have various means of dealing with low environmental temperatures, but relatively few species have been rigorously investigated. Consequently, we have little information to predict how ectotherm populations might respond to global temperature changes. Tortoises from temperate and subtropical regions often overcome periodically cool conditions by hibernation, but speckled dwarf tortoises (Chersobius signatus) need to remain active to exploit ephemeral resources in their arid winter-rainfall habitat. This study investigated how dwarf tortoises cope with low temperatures in winter and spring, by measuring thermal habitat quality and thermoregulation based on differently-sized operative temperature models in sun, shade, and in deep crevices. Investigations continued in summer and autumn to obtain a year-round picture of thermoregulatory challenges. Although large models (i.e., larger than dwarf tortoises) were expected to have lower operative temperatures than smaller models, due to the former's larger thermal inertia, all model sizes had similar temperatures. Hence, the species' small body size does not appear constrained by obtainable body temperatures in cool seasons. Nevertheless, low operative temperatures in winter posed a challenge for the tortoises, which reached their field-preferred body temperature for an average of only 0.8-0.9h per day. Moreover, a low thermoregulation effectiveness suggested that tortoises traded-off physiological benefits of favourable body temperatures against predation risk. Spring and autumn provided higher temperatures, but summer caused the greatest thermoregulatory challenge. Although summer body temperatures were closer to field-preferred body temperature than in any other season, tortoises required rock crevices to avoid overheating. The small size of dwarf tortoises might help them utilise crevices. In summer, maximum operative temperatures in crevices were similar to field-preferred body temperature, indicating that an increase in environmental temperatures might be detrimental to dwarf tortoises. In light of projected temperature rises, future studies should assess if dwarf tortoises can cope with higher environmental temperatures in summer.
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Affiliation(s)
- Victor J T Loehr
- Homopus Research Foundation, Kwikstaartpad 1, 3403ZH IJsselstein, The Netherlands.
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Mukherjee A, Kumara HN, Bhupathy S. Sun-basking, a necessity not a leisure: Anthropogenic driven disturbance, changing the basking pattern of the vulnerable Indian rock python in Keoladeo National Park, India. Glob Ecol Conserv 2018. [DOI: 10.1016/j.gecco.2017.e00368] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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6
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Seasonal thermal ecology of adult walleye (Sander vitreus) in Lake Huron and Lake Erie. J Therm Biol 2015; 53:98-106. [DOI: 10.1016/j.jtherbio.2015.08.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Revised: 08/13/2015] [Accepted: 08/16/2015] [Indexed: 11/17/2022]
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7
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Facultative thermogenesis during brooding is not the norm among pythons. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 2015; 201:817-25. [PMID: 26113382 DOI: 10.1007/s00359-015-1025-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Revised: 05/02/2015] [Accepted: 06/12/2015] [Indexed: 10/23/2022]
Abstract
Facultative thermogenesis is often attributed to pythons in general despite limited comparative data available for the family. While all species within Pythonidae brood their eggs, only two species are known to produce heat to enhance embryonic thermal regulation. By contrast, a few python species have been reported to have insignificant thermogenic capabilities. To provide insight into potential phylogenetic, morphological, and ecological factors influencing thermogenic capability among pythons, we measured metabolic rates and clutch-environment temperature differentials at two environmental temperatures-python preferred brooding temperature (31.5 °C) and a sub-optimal temperature (25.5 °C)-in six species of pythons, including members of two major phylogenetic branches currently devoid of data on the subject. We found no evidence of facultative thermogenesis in five species: Aspidites melanocephalus, A. ramsayi, Morelia viridis, M. spilota cheynei, and Python regius. However, we found that Bothrochilus boa had a thermal metabolic sensitivity indicative of facultative thermogenesis (i.e., a higher metabolic rate at the lower temperature). However, its metabolic rate was quite low and technical challenges prevented us from measuring temperature differential to make conclusions about facultative endothermy in this species. Regardless, our data combined with existing literature demonstrate that facultative thermogenesis is not as widespread among pythons as previously thought.
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Bruton MJ, McAlpine CA, Smith AG, Franklin CE. The importance of underground shelter resources for reptiles in dryland landscapes: A woma python case study. AUSTRAL ECOL 2014. [DOI: 10.1111/aec.12150] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Melissa J. Bruton
- Landscape Ecology and Conservation Group; School of Geography, Planning and Environmental Management; The University of Queensland; Brisbane Qld 4072 Australia
| | - Clive A. McAlpine
- Landscape Ecology and Conservation Group; School of Geography, Planning and Environmental Management; The University of Queensland; Brisbane Qld 4072 Australia
- National Environmental Research Program for Environmental Decisions; The University of Queensland; Brisbane Queensland Australia
| | - Andrew G. Smith
- Landscape Ecology and Conservation Group; School of Geography, Planning and Environmental Management; The University of Queensland; Brisbane Qld 4072 Australia
| | - Craig E. Franklin
- School of Biological Sciences; The University of Queensland; Brisbane Queensland Australia
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McMaster MK, Downs CT. Thermoregulation in leopard tortoises in the Nama-Karoo: The importance of behaviour and core body temperatures. J Therm Biol 2013. [DOI: 10.1016/j.jtherbio.2013.02.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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DeNardo DF, Lourdais O, Stahlschmidt ZR. Are Females Maternal Manipulators, Selfish Mothers, Or Both? Insight from Pythons. HERPETOLOGICA 2012. [DOI: 10.1655/herpetologica-d-12-00023.1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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BRYANT GILLIANL, DE TORES PAULJ, WARREN KRISTINA, FLEMING PATRICIAA. Does body size influence thermal biology and diet of a python (Morelia spilota imbricata)? AUSTRAL ECOL 2011. [DOI: 10.1111/j.1442-9993.2011.02318.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Bisi F, Newey S, Nodari M, Wauters LA, Harrison A, Thirgood S, Martinoli A. The strong and the hungry: bias in capture methods for mountain hares Lepus timidus. WILDLIFE BIOLOGY 2011. [DOI: 10.2981/10-133] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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Harvey DS, Weatherhead PJ. Thermal ecology of Massasauga Rattlesnakes (Sistrurus catenatus) near their northern range limit. CAN J ZOOL 2011. [DOI: 10.1139/z10-094] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Using populations at their northern range limits, we compared the thermoregulatory behaviour of Massasauga Rattlesnakes ( Sistrurus catenatus (Rafinesque, 1818)) to published results for Ratsnakes ( Elaphe obsoleta (Say in James, 1823)) and Northern Watersnakes ( Nerodia sipedon (L., 1758)) to test the hypothesis that given similar benefits of thermoregulation, costs associated with foraging ecology should shape thermoregulatory behaviour. More than 32 000 body temperature measurements from 34 individual snakes over 4 years were used to quantify thermoregulation by Massasauga Rattlesnakes using standard indices and a new index (%MaxE) that describes how much of the thermoregulatory potential available to a snake is realized. On average, Massasaugas were much cooler (db = 6.9 °C) than their preferred body temperature range (30–33.6 °C) but warmer (de – db = 3.3 °C) than were they not thermoregulating. Massasaugas realized more than half of their environmental potential for effective thermoregulation (%MaxE = 64%). Consistent with there being less conflict between foraging and thermoregulation for ambush predators than active foragers, Massasaugas were more effective thermoregulators than Ratsnakes or Watersnakes during the day. All three species were effective thermoregulators at night, supporting the assumption that species in a cool environment will thermoregulate when there are few competing interests.
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Affiliation(s)
- Daniel S. Harvey
- Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, IL 61801, USA
| | - Patrick J. Weatherhead
- Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, IL 61801, USA
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Lelièvre H, Le Hénanff M, Blouin-Demers G, Naulleau G, Lourdais O. Thermal strategies and energetics in two sympatric colubrid snakes with contrasted exposure. J Comp Physiol B 2009; 180:415-25. [DOI: 10.1007/s00360-009-0423-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2009] [Revised: 11/05/2009] [Accepted: 11/09/2009] [Indexed: 11/25/2022]
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Bulté G, Blouin-Demers G. Implications of extreme sexual size dimorphism for thermoregulation in a freshwater turtle. Oecologia 2009; 162:313-22. [DOI: 10.1007/s00442-009-1469-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2009] [Accepted: 08/27/2009] [Indexed: 11/28/2022]
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17
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STAHLSCHMIDT ZACHARYR, DENARDO DALEF. Obligate costs of parental care to offspring: egg brooding-induced hypoxia creates smaller, slower and weaker python offspring. Biol J Linn Soc Lond 2009. [DOI: 10.1111/j.1095-8312.2009.01280.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Stahlschmidt ZR, Denardo DF. Effect of nest temperature on egg-brooding dynamics in Children's pythons. Physiol Behav 2009; 98:302-6. [PMID: 19538977 DOI: 10.1016/j.physbeh.2009.06.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2009] [Revised: 06/04/2009] [Accepted: 06/05/2009] [Indexed: 11/16/2022]
Abstract
Parental care meets several critical needs of developing offspring. In particular, egg brooding in pythons is an exceptional model for examining environmental influences on specific parental behaviors because brooding behaviors are dynamic yet simple and modulate embryonic temperature, respiration, and water balance. We used captive Children's pythons (Antaresia childreni) to assess their facultative endothermic capability, the influence on egg-brooding behaviors of the gradient between the nest temperature (T(nest)) and clutch temperature (T(clutch)), and the effect of these behaviors on the developmental micro-environment. We monitored maternal egg-brooding behavior, rates of brooding unit (i.e., female and associated clutch) respiratory gas exchange, T(nest), T(clutch), and intra-clutch oxygen tension (PO(2)clutch) during acute changes among four incubation temperature conditions: constant preferred temperature (31.5 degrees C); 'cooling' (T(nest)<T(clutch)); constant cool temperature (25.6 degrees C); and 'warming' (T(nest)>T(clutch)). We demonstrated that A. childreni are not facultatively endothermic because brooding unit temperature coefficient (Q(10)) for V(O2) and V(CO2) was similar to other ectothermic boid snakes (1.9-5.7) and T(clutch) conformed to T(nest) at the constant, cool temperature treatment. Females coiled tightly around eggs more often during cooling than during warming. Further, the amount of time that females spent tightly coiled during warming significantly affected the T(nest)-T(clutch) gradient. Together these results indicate that, although female A. childreni are not facultatively endothermic, they are capable of assessing the T(nest)-T(clutch) gradient and making behavioral adjustments to enhance the thermal micro-environment of their developing offspring.
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Eskew EA, Willson JD, Winne CT. Ambush site selection and ontogenetic shifts in foraging strategy in a semi-aquatic pit viper, the Eastern cottonmouth. J Zool (1987) 2009. [DOI: 10.1111/j.1469-7998.2008.00527.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Stahlschmidt ZR, Hoffman TCM, DeNardo DF. Postural Shifts During Egg-Brooding and Their Impact on Egg Water Balance in Children’s Pythons (Antaresia childreni). Ethology 2008. [DOI: 10.1111/j.1439-0310.2008.01553.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Interspecific differences in heat exchange rates may affect competition between introduced and native freshwater turtles. Biol Invasions 2008. [DOI: 10.1007/s10530-008-9355-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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22
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MacKinnon CA, Lawson A, Stevens ED, Brooks RJ. Body temperature fluctuations in free-ranging eastern foxsnakes (Elaphe gloydi) during cold-water swimming. CAN J ZOOL 2006. [DOI: 10.1139/z05-168] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We examined the thermal biology of free-ranging terrestrial eastern foxsnakes (Elaphe gloydi Conant, 1940) that were voluntarily swimming in cold water during spring, in Georgian Bay, Ontario, Canada. Using temperature-sensitive radiotelemetry, we recorded body temperatures of foxsnakes during 12 cold-water swims, and subsequent warming on shore. During these swims, water temperatures were from 11 to 22 °C and distances of 85–1330 m were travelled. Snakes that were in cold water long enough equilibrated with water temperature and did not maintain a body temperature above ambient. The largest observed drop in body temperature was 22.6 °C (over 11 min) and the largest increase was 23 °C (over 66 min). Such large, rapid temperature fluctuations have not previously been reported in detail from snakes in the field. Twice as many telemetry observations as expected occurred between 1200 and 1400, suggesting that snakes chose to swim midday. Additionally, our results suggest that foxsnakes bask to raise their body temperature prior to swimming in cold water. We compared swimming speed and the coefficient of temperature change among foxsnakes and other snake species. Swimming speed was positively correlated with water temperature, similar to other findings. We found no clear trend between mass and the coefficients of cooling and warming; however, snakes cooled in water 2.8–8.6 times faster than they warmed in air.
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Sievert LM, Jones DM, Puckett MW. Postprandial thermophily, transit rate, and digestive efficiency of juvenile cornsnakes, Pantherophis guttatus. J Therm Biol 2005. [DOI: 10.1016/j.jtherbio.2005.02.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Grayson KL, Dorcas ME. SEASONAL TEMPERATURE VARIATION IN THE PAINTED TURTLE (CHRYSEMYS PICTA). HERPETOLOGICA 2004. [DOI: 10.1655/03-43] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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