Habitat Selection and Migration of Caiman crocodilus crocodilus in a Swamp and Swamp-Forest Habitat in Northern Suriname

1988 ◽  
Vol 22 (3) ◽  
pp. 283 ◽  
Author(s):  
Paul E. Ouboter ◽  
Lurly M. R. Nanhoe
Keyword(s):  
Habitat Selection ◽  
Forest Habitat ◽  
Swamp Forest ◽  
Caiman Crocodilus ◽  
And Migration

scholarly journals STUDI KEANEKARAGAMAN JENIS TUMBUHAN LIANA SEBAGAI SUMBER PAKAN PRIMATA DI STASIUN PENELITIAN CABANG PANTI TAMAN NASIONAL GUNUNG PALUNG

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
. Riduwan ◽  
Hari Prayogo ◽  
Lolyta Sisillia
Keyword(s):  
Plant Species ◽  
National Park ◽  
Alluvial Soil ◽  
Research Station ◽  
Habitat Types ◽  
Forest Habitat ◽  
Swamp Forest ◽  
Peat Swamp Forest ◽  
Peat Swamp

Liana is a species of plant that has a way of growing by creeping, spreading, or hanging on its host, but its roots are still attached to the ground. Liana is one of the primate feeds in Cabang Panti Research Station. The riset was conducted from August 15 - September 15 2018 at the Cabang Panti Research Station-Gunung Palung National Park. This riset aims to obtain data on the diversity of liana species and is expected to provide data and information about the diversity of these plant species. The results showed in five habitat types namely the peat swamp forest habitat - freshwater swamps found 79 individuals, alluvial soil found 54 individuals, sandy rocks found 59 individuals, Lowland granite found 56 individuals and highland granite found 38 individuals. The total number of the five habitat types is 286 individuals from 21 genus/species. Keywords: Cabang Panti Research Station, Diversity, Lianas Plants.

scholarly journals Northern Snakes Appear Much More Abundant in Old Fields than in Forests

2018 ◽  
Vol 131 (3) ◽  
pp. 228-234
Author(s):  
Francisco Retamal Diaz ◽  
Gabriel Blouin-Demers
Keyword(s):  
Habitat Selection ◽  
Thermal Conditions ◽  
Strong Preference ◽  
Thamnophis Sirtalis ◽  
Old Fields ◽  
Behavioural Thermoregulation ◽  
Body Temperatures ◽  
Forest Habitat ◽  
Thermal Constraints ◽  
Northern Latitudes

Temperature is one of the most important factors regulating habitat selection by ectotherms. Through behavioural thermoregulation, reptiles maintain preferred body temperatures and thereby maximize fitness. At northern latitudes, small colubrids appear to use forest habitat rarely because of thermal constraints. In cool environments, open habitats such as old fields offer more favourable thermal conditions than forest. We studied two northern colubrid snakes, Red-bellied Snake (Storeria occipitomaculata) and Common Gartersnake (Thamnophis sirtalis), in Gatineau Park, Quebec, Canada, to test the hypothesis that small northern snakes are more abundant in open than in closed habitats because open habitats provide better opportunities for thermoregulation. Snakes were sampled using large arrays of tin and plywood coverboards. Snakes were indeed much more abundant in old fields than in forest, and fields offered more favourable thermal conditions. Most snakes were captured in spring and summer (May to August) when temperatures were highest. Storeria occipitomaculata preferred tin over plywood coverboards. We confirmed an apparent strong preference for open habitats in northern snakes.

Habitat Selection

Ecology ◽  
2013 ◽  
Author(s):  
Douglas Morris
Keyword(s):  
Habitat Selection ◽  
Habitat Use ◽  
Behavioral Ecology ◽  
Evolutionary Biology ◽  
Evolutionary Game ◽  
Relative Role ◽  
Vital Rates ◽  
Space And Time ◽  
Adaptive Choice ◽  
And Migration

All organisms use habitat that varies across numerous scales of space and time. Consequently, the use of some habitats over others, and the rules that individuals use to make those choices, is a dominant theme in fields ranging from behavioral ecology to evolutionary biology. No standard definition exists for either habitat or habitat selection. To the extent that clear thinking emerges from clear definitions, ecologists should rally around the principle that habitats are defined by the organisms using them. For example, habitats could be distinguished whenever a species’ vital rates at low density differ from one area to another or when the relationship between a species’ density and its fitness in those areas differs. Similarly, effects of space and time might be addressed through a hierarchy of movement behaviors such as foraging (patch), dispersal (habitat), and migration (landscape). We also need to define selection, which is typically used in two fundamentally different ways. To some, selection represents higher use of one or more habitats than expected based on their availability (also called course-grained habitat use). But for many others, selection equates with active and adaptive choice of habitat based on cues that reliably inform individuals of the fitness costs and benefits associated with movement from one area to another. When reading the massive literature on habitat selection, one must know which definitions are being used, what scales are being examined, and, most importantly, what the study aims to test, document, or apply. Much of the theory assumes that organisms should choose habitats in a way that maximizes fitness and that decisions emerge from a struggle for existence (fitness declines with density). Viewed in this light, habitat selection is an evolutionary game that serves as a mechanism for regulating populations in space, including source-sink dynamics, and a process that underlies the distributions and relative abundances of species. Nevertheless, the study of habitat selection is complicated by issues such as distinguishing habitats, determining the best ways to measure a habitat’s quality, evaluating the relative role of active choice as a mechanism causing spatial variation in abundance versus that caused by intrinsic differences in dispersal and population growth, determining cues that organisms use to choose habitats, and assessing how spatial scale and patterns in the landscape limit habitat use.

Habitat Selection by Crawfish Frogs (Lithobates areolatus) in a Large Mixed Grassland/Forest Habitat

2012 ◽  
Vol 46 (4) ◽  
pp. 682-688 ◽  
Author(s):  
Perry J. Williams ◽  
Joseph R. Robb ◽  
Daryl R. Karns
Keyword(s):  
Habitat Selection ◽  
Forest Habitat ◽  
Lithobates Areolatus

scholarly journals Habitat selection and migration of the common shrimp, Palaemon paucidens in Lake Biwa, Japan—An eDNA‐based study

2019 ◽  
Vol 1 (1) ◽  
pp. 54-63 ◽  
Author(s):  
Qianqian Wu ◽  
Ken Kawano ◽  
Toshiyuki Ishikawa ◽  
Masayuki K. Sakata ◽  
Ryohei Nakao ◽  
...  
Keyword(s):  
Habitat Selection ◽  
Lake Biwa ◽  
The Common ◽  
And Migration

Demonstration of Retinal Glycogen with Silver Methenamine

1971 ◽  
Vol 29 ◽  
pp. 564-565
Author(s):  
A. W. Sedar ◽  
G. H. Bresnick
Keyword(s):  
Lactic Acid ◽  
Chromic Acid ◽  
Periodic Acid ◽  
Müller Cell ◽  
External Limiting Membrane ◽  
Electron Microscope Level ◽  
Reactive Process ◽  
Inner Limiting Membrane ◽  
Muller Cell ◽  
And Migration

After experimetnal damage to the retina with a variety of procedures Müller cell hypertrophy and migration occurs. According to Kuwabara and others the reactive process in these injuries is evidenced by a marked increase in amount of glycogen in the Müller cells. These cells were considered originally supporting elements with fiber processes extending throughout the retina from inner limiting membrane to external limiting membrane, but are known now to have high lactic acid dehydrogenase activity and the ability to synthesize glycogen. Since the periodic acid-chromic acid-silver methenamine technique was shown to demonstrate glycogen at the electron microscope level, it was selected to react with glycogen in the fine processes of the Müller cell that ramify among the neural elements in various layers of the retina and demarcate these cells cytologically. The Rhesus monkey was chosen as an example of a well vascularized retina and the rabbit as an example of a avascular retina to explore the possibilities of the technique.

Structure and migration of planar defects in crystals observed in atomic scale

1978 ◽  
Vol 36 (1) ◽  
pp. 284-285 ◽  
Author(s):  
H. Hashimoto ◽  
Y. Sugimoto ◽  
Y. Takai ◽  
H. Endoh
Keyword(s):  
Electron Microscope ◽  
Rotation Angle ◽  
Crystal Surface ◽  
Electron Gun ◽  
Atomic Scale ◽  
Present Observation ◽  
Twist Boundary ◽  
Optical Magnification ◽  
Zinc Crystal ◽  
And Migration

As was demonstrated by the present authors that atomic structure of simple crystal can be photographed by the conventional 100 kV electron microscope adjusted at “aberration free focus (AFF)” condition. In order to operate the microscope at AFF condition effectively, highly stabilized electron beams with small energy spread and small beam divergence are necessary. In the present observation, a 120 kV electron microscope with LaB6 electron gun was used. The most of the images were taken with the direct electron optical magnification of 1.3 million times and then magnified photographically.1. Twist boundary of ZnSFig. 1 is the image of wurtzite single crystal with twist boundary grown on the surface of zinc crystal by the reaction of sulphur vapour of 1540 Torr at 500°C. Crystal surface is parallel to (00.1) plane and electron beam is incident along the axis normal to the crystal surface. In the twist boundary there is a dislocation net work between two perfect crystals with a certain rotation angle.

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