The Relationship between the Habitat Preferences of Hatchling Chelydra Serpentina and the Physical Structure of the Vegetation

Ecology ◽  
1958 ◽  
Vol 39 (4) ◽  
pp. 751-754 ◽  
Author(s):  
Owen J. Sexton
Keyword(s):  
Habitat Preferences ◽  
Physical Structure ◽  
Chelydra Serpentina ◽  
The Relationship

scholarly journals Microhabitat Preferences of two Sympatric Lacertid in the National Park of El Kala, Algeria

2018 ◽  
Vol 52 (3) ◽  
pp. 251-256
Author(s):  
Rachid Rouag ◽  
Nadia Ziane ◽  
Slim Benyacoub
Keyword(s):  
National Park ◽  
Community Organization ◽  
Habitat Preferences ◽  
Physical Structure ◽  
Sympatric Populations ◽  
North Eastern ◽  
Psammodromus Algirus ◽  
Microhabitat Preferences ◽  
Eastern Algeria ◽  
The Relationship

Abstract Habitat preferences were studied in sympatric populations of two Lacertids, Psammodromus algirus and Acanthodactylus erythrurus (Lacertidae) from the National Park of El Kala (north-eastern Algeria). The relationship between habitat physical structure and population densities was studied in order to establish eventual segregation between the two lizards. A difference exists between the two species in their distributions. Acanthodactylus erythrurus is a strictly terrestrial species, usually found on sandy and more open grounds than Psammodromus algirus which can penetrate dense vegetation and look for sunny locations by climbing on shrubs; a behavior which A. erythrurus does not control. Our results confirm spatial segregation on a microhabitat scale, supporting the conclusions that microhabitat selection is an important factor in lizards community organization and contributing to reduce potential competition.

Effects of light, temperature and population variability on the germination of seven Spanish pines

2002 ◽  
Vol 12 (4) ◽  
pp. 261-271 ◽  
Author(s):  
A. Escudero ◽  
F. Pérez-García ◽  
A. L. Luzuriaga
Keyword(s):  
Habitat Preferences ◽  
Population Variability ◽  
Nested Models ◽  
Germination Response ◽  
Germination Characteristics ◽  
Different Populations ◽  
Effects Of Temperature ◽  
Germination Traits ◽  
The Relationship ◽  
Pine Species

AbstractMost Pinus species are obligate seeders. Thus, knowledge of germination characteristics can help in the understanding, prediction and manipulation of the regeneration and dynamics of pine forests. Seven pine species with contrasting habitat preferences and different genetic pairwise distances are present in the Iberian Peninsula and the Canary Islands: P. halepensis, P. nigra, P. pinaster, P. pinea, P. sylvestris, P. uncinata and P. canariensis. These seven pine species comprise an exceptional experimental set to test some questions related to germination traits, such as: (1) What are the effects of light and temperature on germination, taking into account interpopulation variability? (2) Is there any association of germination traits with habitat (montane versus lowland) preferences? and (3) What is the relationship between germination traits and the genetic distance between pine species? P. nigra, P. sylvestris and P. uncinata seeds showed faster germination rates. Seeds of P. nigra and P. sylvestris reached high total germination percentages in every temperature and light treatment, suggesting an opportunistic germination strategy. Unlike montane pines, lowland pines did show significant effects of temperature on germination response: final germination was higher between 15°C and 20°C than at warmer and alternating temperatures. Relatively low temperatures associated with the winter rainy season would favour germination of most of these species. Nested models showed that population variability was the main source of variation in germination response. Thus, there is no phylogenetic control of the germination response and, surprisingly, germination traits were not related to habitat preferences. As a consequence, we believe that studies of the germination characteristics of a pine species should consider different populations.

The relationship of body size to survivorship of hatchling snapping turtles ( Chelydra serpentina ): an evaluation of the "bigger is better" hypothesis

Oecologia ◽  
1999 ◽  
Vol 121 (2) ◽  
pp. 224-235 ◽  
Author(s):  
Justin D. Congdon ◽  
Roy D. Nagle ◽  
Chirstopher W. Beck ◽  
Owen M. Kinney ◽  
S. Rebecca Yeomans ◽  
...  
Keyword(s):  
Body Size ◽  
Chelydra Serpentina ◽  
Snapping Turtles ◽  
Relationship Of ◽  
The Relationship

Diversity, spatiotemporal distribution, abundance, species composition and habitat preferences of Ostracoda in Akbük and Akdeniz coastal mesosaline lagoons (Muğla, the South Aegean Region, Turkey)

2015 ◽  
Vol 44 (2) ◽  
Author(s):  
Selçuk Altınsaçlı ◽  
Ferda Perçin-Paçal ◽  
Songül Altınsaçlı
Keyword(s):  
Environmental Factors ◽  
Environmental Variables ◽  
Habitat Preferences ◽  
Aegean Region ◽  
Qualitative And Quantitative ◽  
Ordination Techniques ◽  
Ecological Importance ◽  
The Relationship ◽  
Ostracod Species

AbstractAkdeniz and Akbuk lagoons are part of a shallow coastal ecosystem of great aesthetic and ecological importance, located in Muğla Province in the southern Aegean region of Turkey. In the present study, four expeditions to collect ostracods from these lagoons were conducted in May, July, October, and November of 2008. Benthic samples were obtained monthly and several environmental factors were recorded simultaneously in situ. The ecological preferences of the ostracods were monitored, and qualitative and quantitative samples were collected from three sites in Akdeniz lagoon and two sites in Akbuk lagoon. Three ostracod taxa (Cyprideis torosa, Loxoconcha elliptica and Cytherois fischeri) were identified from the Akdeniz lagoon sampling sites and one species (Cyprideis torosa) from the Akbuk lagoon sampling sites. We present and analyze the dominance and distribution of ostracod assemblages and their relationships to environmental factors: temperature, dissolved oxygen, percentage oxygen saturation, pH, redox potential, salinity, and electrical conductivity) using classification and ordination techniques. Canonical correspondence analysis (CCA) is used to characterize the relationship between ostracods and the environmental variables. Approximately 82% of the correlation between the community composition and environmental variables was explained by the first axis of the CCA ordination for the Akdeniz lagoon. The study revealed that the distribution and population density of ostracod species depends on the physicochemical properties of the environment. The reason for this is that Cyprideis torosa and Loxoconcha elliptica are euryhaline species.

Experimental demonstration of catch hyperstability from habitat aggregation, not effort sorting, in a recreational fishery

2020 ◽  
Vol 77 (4) ◽  
pp. 762-769 ◽  
Author(s):  
Colin J. Dassow ◽  
Alexander J. Ross ◽  
Olaf P. Jensen ◽  
Greg G. Sass ◽  
Brett T. van Poorten ◽  
...  
Keyword(s):  
Littoral Zone ◽  
Habitat Preferences ◽  
Fish Abundance ◽  
Experimental Demonstration ◽  
Recreational Fisheries ◽  
Spawning Habitat ◽  
Preferred Habitat ◽  
Fish Aggregation ◽  
Catch Rates ◽  
The Relationship

The relationship between angler catch rates and fish abundance can contribute to or hinder sustainable exploitation of fisheries depending on whether catch rates are proportional to fish abundance or are hyperstable. We performed a whole-ecosystem experiment in which fish abundance was manipulated and paired with weekly angler catch rate estimates from controlled experimental fishing. Catch rates were hyperstable (β = 0.47) in response to changes in fish abundance. By excluding effort sorting (i.e., catch rates remaining high because less skilled anglers leave the fishery as abundance declines), our experiment isolated the influence of fish aggregation as a driver of hyperstability. Spatial analysis of catch locations did not identify clustering around specific points, suggesting that loose aggregation to preferred habitat at the scale of the entire littoral zone was enough to maintain stable catch rates. In our study, general, non-spawning, habitat preferences created loose aggregations for anglers to target, which was sufficient to generate hyperstability. Habitat preferences are common to nearly all fishes and widely known to anglers, suggesting that many harvest-oriented recreational fisheries can be expected to exhibit hyperstability.

scholarly journals Axiomatic design and virtual verification for blackbody cavity sensor

2019 ◽  
Vol 301 ◽  
pp. 00022 ◽  
Author(s):  
Jiangfeng Cheng ◽  
Chia-Feng Juang ◽  
Weihai Chen ◽  
Guohui Mei
Keyword(s):  
Temperature Measurement ◽  
Measurement Accuracy ◽  
Axiomatic Design ◽  
Physical Structure ◽  
Model Material ◽  
Experimental Result ◽  
Functional Requirements ◽  
Geometry Model ◽  
Blackbody Cavity ◽  
The Relationship

The blackbody cavity sensor for continuous temperature measurement of molten steel has been widely used in steel industry. However, due to the closed bottom of the inner tube, the temperature measurement accuracy is seriously affected. It’s urgent to redesign and improve the sensor, which involves multidisciplinary knowledge, including materials, heat and flow science. This paper first clarifies the relationship between sensor functional requirements and various physical structure parameters from the perspective of axiomatic design. On this basis, the virtual models of the blackbody cavity sensor are established, including geometry model, multi-physical field model, material physical properties and boundary conditions. And then through comparison between experiment and simulation, it is found that for the temperature measurement accuracy, the deviations between the simulation and the actual experimental result are less than 1.5℃. This verifies the accuracy of the virtual model.

scholarly journals On the relationship between the H2 emission and the physical structure of planetary nebulae

2012 ◽  
Vol 429 (2) ◽  
pp. 973-986 ◽  
Author(s):  
R. A. Marquez-Lugo ◽  
G. Ramos-Larios ◽  
M. A. Guerrero ◽  
R. Vázquez
Keyword(s):  
Planetary Nebulae ◽  
Physical Structure ◽  
The Relationship
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