Habitat Use and Population Characteristics of the White-Tailed Ptarmigan in the Sierra Nevada, California

The Condor ◽  
1992 ◽  
Vol 94 (4) ◽  
pp. 889-902 ◽  
Author(s):  
Glenn P. Frederick
Keyword(s):  
Habitat Use ◽  
Sierra Nevada ◽  
Population Characteristics

scholarly journals ASSESSMENT OF POPULATION CHARACTERISTICS AND HABITAT USE OF Podocnemis vogli (MÜLLER 1935) DURING A REPRODUCTIVE SEASON AT THE BOJONAWI PRIVATE NATURE RESERVE (VICHADA DEPARTMENT, COLOMBIA)

2020 ◽  
Vol 3 (2) ◽  
pp. 83
Author(s):  
Ana María Sepúlveda-Seguro ◽  
Vivian Patricia Páez ◽  
Marley Tatiana Gómez-Rincón ◽  
Mónica A. Morales-Betancourt ◽  
Carlos A. Lasso
Keyword(s):  
Habitat Use ◽  
Nature Reserve ◽  
Tail Length ◽  
Reproductive Season ◽  
Population Characteristics ◽  
Reproductive Phenology ◽  
Sampling Effort ◽  
Specific Class ◽  
Sexual Characteristics ◽  
Habitat Generalist

We conducted a short study in the Bojonawi Private Nature Reserve (Vichada department, Colombia) in three types of aquatic macrohabitats to characterize habitat use, population structure and reproductive phenology of Podocnemis vogli during one reproductive season. We also reevaluated the degree of sexual dimorphism in this species. To maximize capture rates, we used three methods: funnel traps, trammel nets, and manual capture. Only the funnel traps could be used in a standardized manner in all three macrohabitats. We captured 149 individuals in all age/size classes and obtained 11 recaptures. Since we were able to standardize sampling effort with the funnel traps in all macrohabitats, we compared habitat use and class structure among habitats during this reproductive season. There were no significant differences among the three macrohabitats in terms of relative abundances or size class distributions, but sex ratios differed, with an excess of males in the river and females in the lagoon. As with other congeners, P. vogli is a sexually dimorphic species where females attain larger sizes. In this study we documented that pre-cloacal tail length and nail length on the anterior third toe are the most useful secondary sexual characteristics for sexing subadult and adult individuals. Some females larger than 22 cm straight-line carapace length had calcified eggs in their oviducts. This species is abundant within the reserve and appears to be a habitat generalist, including the use of large rivers. More extensive and intensive monitoring is needed to document specific class survivorship rates, detectabilities and population dynamics.

Habitat Use by Saw-Whet Owls in the Sierra Nevada

2010 ◽  
Vol 74 (7) ◽  
pp. 1523-1532
Author(s):  
Julie E. Groce ◽  
Michael L. Morrison
Keyword(s):  
Habitat Use ◽  
Sierra Nevada

Habitat use by the hymenosomatid crab Amarinus lacustris (Chilton) in two south-eastern Australian rivers

2005 ◽  
Vol 56 (1) ◽  
pp. 37 ◽  
Author(s):  
Kerrylyn Johnston ◽  
Belinda J. Robson
Keyword(s):  
Habitat Use ◽  
Strong Association ◽  
Population Characteristics ◽  
Timing Of Reproduction ◽  
South Eastern ◽  
Period Distribution ◽  
South West ◽  
Linear Modelling ◽  
Time Of Year ◽  
Log Linear

The hymenosomatid crab Amarinus lacustris is abundant in some south-eastern Australian rivers; however, little is known of its ecology. Patterns of habitat use by crabs in rivers may be affected by seasonal changes in river discharge. This study investigates population characteristics, timing of reproduction and patterns of habitat use by A. lacustris in five riffle and pool habitats from each of the Hopkins and Merri Rivers in south-west Victoria, Australia, sampled over a twelve-month period. Distribution of Amarinus lacustris was similar between the two rivers, but log-linear modelling showed that there was a strong association between crab sex, habitat occupied and time of year because female A. lacustris showed a shift from riffle to pool habitats during March and April, coinciding with the non-gravid period of the year. Male crabs also showed a change in relative occurrence, occurring most often in riffles during winter–spring (July–November) but being equally common in both habitats in summer–autumn (January–May). These patterns are probably the result of the reproductive cycle of A. lacustris, which appears to show both ontogenetic and sex-related changes in habitat use during its life cycle, taking advantage of seasonal fluctuations in flow regime that may assist egg/larval development and dispersal.

Movements, habitat use, and population characteristics of adult Pacific lamprey in a coastal river

2013 ◽  
Vol 97 (8) ◽  
pp. 939-953 ◽  
Author(s):  
Steven J. Starcevich ◽  
Stephanie L. Gunckel ◽  
Steven E. Jacobs
Keyword(s):  
Habitat Use ◽  
Population Characteristics ◽  
Pacific Lamprey ◽  
Coastal River

Habitat Use by Saw-Whet Owls in the Sierra Nevada

2010 ◽  
Vol 74 (7) ◽  
pp. 1523-1532 ◽  
Author(s):  
JULIE E. GROCE ◽  
MICHAEL L. MORRISON
Keyword(s):  
Habitat Use ◽  
Sierra Nevada
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