Chemical, thermal, and physical properties of sites selected for overwintering by northern wood turtles (Glyptemys insculpta)

2008 ◽  
Vol 86 (7) ◽  
pp. 659-667 ◽  
Author(s):  
W. F. Greaves ◽  
J. D. Litzgus
Keyword(s):  
Physical Properties ◽  
Water Depth ◽  
Activity Cycle ◽  
Structural Features ◽  
Range Limit ◽  
Glyptemys Insculpta ◽  
Sediment Types ◽  
Radio Transmitters ◽  
Potential Factors ◽  
Wood Turtles

Northern ectotherms must seek refuge from winter conditions for a large portion of their annual activity cycle. The objective of this study was to quantify physical properties of overwintering sites selected by wood turtles ( Glyptemys insculpta (LaConte, 1830)) at the species’ northern range limit. We mapped all structural features (e.g., root balls and log jams), water depth, and sediment types along a 1.5 km stretch of river that was available to turtles outfitted with radio transmitters (N = 8) during winter. Temperature selection was assessed by comparing thermal profiles from data loggers on turtles and temperature stations within the river and other riparian habitats (e.g., ephemeral pools and oxbows). Dissolved oxygen (DO) was measured at each temperature station and turtle location. Wood turtles overwintered in the river, which was colder (~0 °C), had more stable temperatures, and provided higher DO (12.64 ppm) compared with adjacent habitats. Some turtles selected structured refuges for overwintering. Winter movements were not related to temperature or DO, but may be related to maintaining a certain distance from shore and water depth to protect against accidental relocations during winter. We discuss hibernacula as potential factors limiting the northern distribution of wood turtles, a species at risk in Canada.

Geographic Variation in Somatic Growth Rate of Wood Turtles (Glyptemys insculpta)

Copeia ◽  
2018 ◽  
Vol 106 (3) ◽  
pp. 477-484
Author(s):  
Kelsey A. Marchand ◽  
Geoffrey N. Hughes ◽  
Jacqueline D. Litzgus
Keyword(s):  
Growth Rate ◽  
Geographic Variation ◽  
Somatic Growth ◽  
Somatic Growth Rate ◽  
Glyptemys Insculpta ◽  
Wood Turtles

scholarly journals Effects of Stochastic Flood Disturbance on Adult Wood Turtles, Glyptemys insculpta, in Massachusetts

2009 ◽  
Vol 123 (4) ◽  
pp. 313 ◽  
Author(s):  
Michael T. Jones ◽  
Paul R. Sievert
Keyword(s):  
Average Rate ◽  
Population Connectivity ◽  
Flood Frequency ◽  
Flood Disturbance ◽  
Franklin County ◽  
Present Evidence ◽  
Glyptemys Insculpta ◽  
Riparian System ◽  
Flood Intensity ◽  
Wood Turtles

The homing ability of non-marine turtles has been studied in a variety of taxa, and many species appear to be capable of short-range homing on the scale of several hundred meters or a few kilometers following experimental displacement. However, the behavioral response of turtles following a naturally caused displacement has seldom been reported. In this paper, we describe the effect of displacement ranging from 1.4 to 16.8 km (average = 4.8 km) by severe floods in a stream system in Massachusetts. We radio-tracked 38 adult Wood Turtles (Glyptemys insculpta) at five separate sites in Franklin County, Massachusetts, for periods ranging from one to four activity seasons and documented the displacement of a total of 12 Wood Turtles during seven floods between 2004 and 2008. Based on the average rate of displacement per flood and annual flood frequency, we estimate that, during our study, floods displaced over 40% of this Wood Turtle subpopulation annually. We present evidence that displacement results in elevated mortality rates and that displaced Wood Turtles mate and nest in the year following displacement at rates well below average; on a longer time scale, however, displacement by flooding may be an important mechanism of population connectivity in some areas. We also present evidence that most Wood Turtles avoid stream segments with stream gradient steeper than 1%; this may in part reflect an adaptation to avoid severe floods. Regional models and empirical data from stream gages suggest that flood intensity may currently be on an increasing trend. Conversion of upland from forest and fields to impervious surfaces and hardening of upstream riverbanks may have exacerbated recent flooding and decreased the resiliency of the riparian system to increased precipitation.

scholarly journals Complex ceramic structures. I. Weberites

2009 ◽  
Vol 65 (3) ◽  
pp. 269-290 ◽  
Author(s):  
Lu Cai ◽  
Juan C. Nino
Keyword(s):  
Physical Properties ◽  
Ionic Radius ◽  
Structural Features ◽  
Stability Field ◽  
Bond Ionicity ◽  
Coordination Environment ◽  
Technological Potential ◽  
Axial Transformation ◽  
First Time ◽  
Selection Of

The weberite structure (A 2 B 2 X 7) is an anion-deficient fluorite-related superstructure. Compared with fluorites, the reduction in the number of anions leads to a decrease in the coordination number of the B cations (VI coordination) with respect to the A cations (VIII coordination), thus allowing the accommodation of diverse cations. As a result, weberite compounds have a broad range of chemical and physical properties and great technological potential. This article summarizes the structural features of weberite and describes the structure in several different ways. This is the first time that the stacking vector and stacking angle are used to represent the weberite structure. This paper also discusses the crystallographic relationship between weberite, fluorite and pyrochlore (another fluorite-related structure). The cation sublattices of weberite and pyrochlore are correlated by an axial transformation. It has been shown that the different coordination environment of anions is due to the alternating layering of the AB 3 and A 3 B close-packed cation layers. A stability field of weberite oxides is proposed in terms of the ratio of ionic radius of cations and relative bond ionicity. In addition, a selection of weberite compounds with interesting properties is discussed.

Nest-Site Selection by Wood Turtles (Glyptemys insculpta) in a Thermally Limited Environment

2009 ◽  
Vol 16 (3) ◽  
pp. 321-338 ◽  
Author(s):  
Geoffrey N. Hughes ◽  
William F. Greaves ◽  
Jacqueline D. Litzgus
Keyword(s):  
Site Selection ◽  
Nest Site ◽  
Nest Site Selection ◽  
Glyptemys Insculpta ◽  
Wood Turtles

scholarly journals Passive transport of Eastern Elliptio (Elliptio complanata) by freshwater turtles in New England

2020 ◽  
Vol 134 (1) ◽  
pp. 56-59
Author(s):  
Michael T. Jones ◽  
Lisabeth L. Willey ◽  
Derek T. Yorks ◽  
Peter D. Hazelton ◽  
Steve L. Johnson
Keyword(s):  
New England ◽  
Painted Turtle ◽  
Chelydra Serpentina ◽  
Freshwater Turtles ◽  
Long Distance ◽  
Host Fish ◽  
Snapping Turtle ◽  
Elliptio Complanata ◽  
Glyptemys Insculpta ◽  
Wood Turtles

Dispersal of freshwater mussels (order Unionida) is primarily as glochidia on the fins and gills of host fish. Adult mussels are more sessile, generally moving short distances (<2 m/week) along lake and river beds. Between 2007 and 2016, we observed seven instances of adult Eastern Elliptio (Elliptio complanata) and one instance of a fingernail clam (Sphaerium sp.) attached to the feet of freshwater turtles in streams and ponds of New England, United States. Observations included five instances of mussels attached to Wood Turtles (Glyptemys insculpta) in Maine and Massachusetts, one instance of a mussel attached to the fingernail of an Eastern Painted Turtle (Chrysemys picta) in Massachusetts, one instance of a mussel attached to a Snapping Turtle (Chelydra serpentina) in Massachusetts, and one instance of a fingernail clam attached to the fingernail of an Eastern Painted Turtle in Massachusetts. We suggest that Eastern Elliptio may be susceptible to transport by freshwater turtles foraging in mussel beds and that transport of adult mussels by freshwater turtles could result in otherwise atypical long-distance, upstream, or overland dispersal between waterbodies.

scholarly journals Structural features and physical properties of In2Bi3Se7I and InBi2Se4I

2011 ◽  
Vol 67 (a1) ◽  
pp. C495-C495
Author(s):  
T. Rosenthal ◽  
M. Döblinger ◽  
P. J. Wagatha ◽  
O. Oeckler
Keyword(s):  
Physical Properties ◽  
Structural Features

scholarly journals Heterometal Grafted metalla-ynes and Poly(metalla-ynes): A Review on Structure–Property Relationships and Applications

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3654
Author(s):  
Rayya A. Al-Balushi ◽  
Ashanul Haque ◽  
Idris J. Al-Busaidi ◽  
Houda Al-Sharji ◽  
Muhammad S. Khan
Keyword(s):  
Physical Properties ◽  
Main Chain ◽  
Functional Materials ◽  
Photo Luminescence ◽  
Structural Features ◽  
Side Chain ◽  
Structure Property ◽  
Molecular Scaffolds ◽  
Structure Property Relationships ◽  
Rigid Rod

Metalla-ynes and poly(metalla-ynes) have emerged as unique molecular scaffolds with fascinating structural features and intriguing photo-luminescence (PL) properties. Their rigid-rod conducting backbone with tunable photo-physical properties has generated immense research interests for the design and development of application-oriented functional materials. Introducing a second d- or f-block metal fragment in the main-chain or side-chain of a metalla-yne and poly(metalla-yne) was found to further modulate the underlying features/properties. This review focuses on the photo-physical properties and opto-electronic (O-E) applications of heterometal grafted metalla-ynes and poly(metalla-ynes).

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