Experimental Tests of Optimal Habitat Use in Fish: The Role of Relative Habitat Profitability

Ecology ◽  
1983 ◽  
Vol 64 (6) ◽  
pp. 1525-1539 ◽  
Author(s):  
Earl E. Werner ◽  
Gary G. Mittelbach ◽  
Donald J. Hall ◽  
James F. Gilliam
Keyword(s):  
Habitat Use ◽  
Experimental Tests ◽  
Optimal Habitat

scholarly journals Relative Role of Flower Color and Scent on Pollinator Attraction: Experimental Tests using F1 and F2 Hybrids of Daylily and Nightlily

PLoS ONE ◽  
2012 ◽  
Vol 7 (6) ◽  
pp. e39010 ◽  
Author(s):  
Shun K. Hirota ◽  
Kozue Nitta ◽  
Yuni Kim ◽  
Aya Kato ◽  
Nobumitsu Kawakubo ◽  
...  
Keyword(s):  
Experimental Tests ◽  
Flower Color ◽  
Relative Role ◽  
Pollinator Attraction ◽  
F2 Hybrids

scholarly journals Analysis of the NUPEC PSBT Tests with FLICA-OVAP

2012 ◽  
Vol 2012 ◽  
pp. 1-18 ◽  
Author(s):  
Matteo Bucci ◽  
Philippe Fillion
Keyword(s):  
Nuclear Power ◽  
Experimental Tests ◽  
Physical Models ◽  
Rod Bundles ◽  
Two Phase ◽  
Experimental Database ◽  
Boiling Crisis ◽  
Power Increase ◽  
Relevant Role

This paper discusses the results of a computational activity devoted to the prediction of two-phase flows in subchannels and in rod bundles. The capabilities of the FLICA-OVAP code have been tested against an extensive experimental database made available by the Japanese Nuclear Power Energy Corporation (NUPEC) in the frame of the PWR subchannel and bundle tests (PSBT) international benchmark promoted by OECD and NRC. The experimental tests herein addressed involve void fraction distributions and boiling crisis phenomena in rod bundles with uniform and nonuniform heat flux conditions. Both steady-state and transient scenarios have been addressed, including power increase, flow reduction, temperature increase, and depressurization, representative of PWR thermal-hydraulics conditions. After a brief description of the main features of FLICA-OVAP, the relevant physical models available within the code are detailed. Results obtained in the different tests included in the PSBT void distribution and DNB benchmarks are therefore reported. The relevant role of selected physical models is discussed.

Habitat Use by Insular Populations of Mus and Peromyscus: What is the Role of Competition?

10.2307/5325 ◽  
1992 ◽  
Vol 61 (2) ◽  
pp. 329 ◽  
Author(s):  
David E. Scott ◽  
Raymond D. Dueser
Keyword(s):  
Habitat Use ◽  
Insular Populations

scholarly journals The role of season and social grouping on habitat use by Mute Swans (Cygnus olor) in a lowland river catchment

Bird Study ◽  
2013 ◽  
Vol 60 (2) ◽  
pp. 229-237 ◽  
Author(s):  
Kevin A. Wood ◽  
Richard A. Stillman ◽  
Terry Coombs ◽  
Claire Mcdonald ◽  
Francis Daunt ◽  
...  
Keyword(s):  
Habitat Use ◽  
Lowland River ◽  
River Catchment ◽  
Cygnus Olor ◽  
Social Grouping ◽  
Mute Swans

Differences in growth rate, body condition, habitat use and food availability between island and mainland lizard populations ofAnolis nebulosusin Jalisco, Mexico

2014 ◽  
Vol 30 (5) ◽  
pp. 493-501 ◽  
Author(s):  
Héctor Hugo Siliceo-Cantero ◽  
Andrés García
Keyword(s):  
Growth Rate ◽  
Habitat Use ◽  
Food Availability ◽  
Body Condition ◽  
Food Supply ◽  
Geographic Isolation ◽  
Seasonal Fluctuations ◽  
Continental Population ◽  
Two Populations

Abstract:Lizards of the genusAnolishave been widely studied, however, little is known about the effects of environmental seasonality, food availability and geographic isolation on body condition, growth rate and habitat use of lizards. The existence of an insular and a continental population ofAnolis nebulosus(clouded anole), separated by only 0.47 km, represents an ideal opportunity to address this topic. We compared seasonal fluctuations in food availability (arthropod density) for anoles, as well as body condition, growth rate and habitat use in the two populations. Food availability throughout the year was sampled every 2 mo by trapping arthropods at each site. Lizards were also monitored and measured every 2 mo by surveying three quadrats in each site over 2 y giving a total of 30 visits for each quadrat. Results suggested that composition and density of food supply was similar for the two populations. Nevertheless, food supply responded to seasonality of rainfall, with an increase of 1.5 times during the rainy season. Despite similarity in food availability, insular anoles had body condition that was 5–10 times better, with growth rate twice as fast, and used similar perches. The role of predation, and inter- and intraspecific competition are discussed as possible drivers.

Is nursing a kid detrimental to nonimmunological compatibility to contact-transmitted foreign bodies in female Iberian ibex (Capra pyrenaica)?

2012 ◽  
Vol 90 (10) ◽  
pp. 1284-1289 ◽  
Author(s):  
Mathieu Sarasa ◽  
Jesús M. Pérez ◽  
José-Enrique Granados ◽  
Ramón C. Soriguer
Keyword(s):  
Foreign Bodies ◽  
Experimental Tests ◽  
Reproductive Costs ◽  
Capra Pyrenaica ◽  
Iberian Ibex ◽  
Increased Susceptibility

Reproductive costs may increase the susceptibility of breeding females to parasites. Compatibility may be modulated by immunity and nonimmunological factors. However, experimental tests attempting to unravel the role of nonimmunological compatibility to parasites are scarce. We experimentally infected breeding and nonbreeding females with pseudoectoparasites (PEPs) to analyse how nursing a kid affects neatness in the Iberian ibex ( Capra pyrenaica Schinz, 1838). Our results revealed that nursing a kid does not seem detrimental to neatness in female Iberian ibex in terms of nonimmunological compatibility to contact-transmitted foreign bodies. Consequently, it seems that increased susceptibility of breeding females to contact-transmitted parasites may be mainly mediated by increased exposure or increased immunological compatibility to parasites.

scholarly journals A New Equivalent Circuit Model Parametrization Methodology Based on Current Pulse Tests for Different Battery Technologies

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7255
Author(s):  
Oier Arregi ◽  
Eneko Agirrezabala ◽  
Unai Iraola ◽  
Aitor Milo ◽  
Josu Yeregui ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Electric Vehicles ◽  
Storage Systems ◽  
Equivalent Circuit Model ◽  
Lithium Ion ◽  
Experimental Tests ◽  
Circuit Model ◽  
Renewable Energy Generation ◽  
Traction Power

With growing global commitment to renewable energy generation, the role of energy storage systems has become a central issue in traction power applications, such as electric vehicles, trains, and elevators. To achieve the optimal integration of batteries in such applications, without unnecessary oversizing, improvements in the process of battery selection are needed. Specifically, it is necessary to develop models able to predict battery performance for each particular application. In this paper, a methodology for the parametrization of a battery equivalent circuit model (ECM) based on capacity and pulse tests is presented. The model can be extrapolated to different battery technologies, and was validated by comparing simulations and experimental tests with lead-acid and lithium-ion batteries.

Distributed Versus Concentrated Flexibility in Shape Control of Lifting Surfaces: The “Belt-Rib” Structural Concept

1999 ◽  
Author(s):  
Lucio Flavio Campanile ◽  
Delf Sachau
Keyword(s):  
Shape Control ◽  
Aircraft Design ◽  
Experimental Tests ◽  
Structural Flexibility ◽  
Short Introduction ◽  
Structural Concept ◽  
Structure Adaptation ◽  
Structure Geometry ◽  
Lifting Surfaces

Abstract The “mechatronic” way of dealing with the issue of structure geometry control, based on mechanical systems with hinges, bearing and discrete actuators, cannot easily cope with the strict requirements of aircraft design. In this paper a “structronic” concept for airfoils with variable camber is presented, in which the desired geometry changes are achieved through structural flexibility and no moveable parts are needed. A short introduction to the “structronic” approach to structure adaptation in general and to airfoil shape control in particular opens the paper, with some emphasis on the role of solid-state actuators. The description of the new structural concept (the belt-rib concept) follows, with the application to the case of a landing flap with variable camber. Some results of FEM simulations as well as of experimental tests on different prototypes — one of them equipped with shape memory wires as actuators — are also included in the paper. The results provide a first feasibility proof of the new concept and encourage further work.

Contact calls of island Brown-throated Parakeets exhibit both character and variance shifts compared to calls of their mainland relatives

The Auk ◽  
2021 ◽  
Vol 139 (1) ◽  
Author(s):  
Jessica R Eberhard ◽  
Irene Zager ◽  
José R Ferrer-Paris ◽  
Kathryn Rodríguez-Clark
Keyword(s):  
Social Dynamics ◽  
Signal Transmission ◽  
Experimental Tests ◽  
Call Duration ◽  
Caribbean Islands ◽  
Body Sizes ◽  
Contact Calls ◽  
Parrot Species ◽  
Different Levels

Abstract Learned vocalizations play a key role in parrot social dynamics and vocal dialects have been documented for several mainland species, but to date no studies of geographically structured call variation in parrot species have examined the role of isolation on islands. In a study of the Brown-throated Parakeet (Eupsittula pertinax), which inhabits 5 small Caribbean islands as well as the adjacent mainland, we found that the contact calls of island and mainland parakeets show divergence in vocal characters as well as in call variability. We assessed call variation using 3 approaches: frequency measurements, spectrogram cross-correlation (SPCC) analyses, and call duration measurements. Island parakeets’ calls were longer and had lower mean frequencies, and calls from different islands were distinguishable from each other as well as from mainland calls using measures derived from the SPCCs. In addition, we measured call variability at 2 different levels—within-location and within-individual. We found calls to be more variable for island parakeets for SPCC and duration measures, but less variable for frequency measures. The observed call differentiation among locations may be due to drift, whereas the lower frequency of island calls could either be a response to the windy environment on the islands or a consequence of the island subspecies’ larger body sizes. We also hypothesize that the isolation of parakeet populations on small islands may have resulted in reduced selection for local call convergence, allowing island parakeets to produce more variable calls. We suggest that due to poor signal transmission in the windy island environment, selective pressures may favor variability in more easily perceived call features (like call duration) rather than more subtle features, like frequency shifts. Experimental tests are required to determine whether observed call patterns translate into similarly structured patterns in the responses to vocal variants.

Sign in / Sign up

Export Citation Format

Share Document