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Full-Text Articles in Life Sciences
Social Organization Of Neotoma Micropus, The Southern Plains Woodrat, Sarah A. Conditt, David O. Ribble
Social Organization Of Neotoma Micropus, The Southern Plains Woodrat, Sarah A. Conditt, David O. Ribble
David O Ribble
This study described the social organization of Neotoma micropus, the southern plains woodrat, using radiotelemetry. We studied woodrats from September 1994 through April 1995 at the Urban Wilderness Reserve in S Bexar County, Texas. Sixteen individuals (three adult males, 11 adult females, and two subadult males) were radiocollared and located in the evening or early morning duringJanuary and February. Seventy-four percent of female radiolocations and 57% of male radiolocations were from their respective nests. No more than one adult individual was observed at any nest at the same time. Males had significantly larger (x = 1899 m2) home ranges than …
Social Organization Of Neotoma Micropus, The Southern Plains Woodrat, Sarah A. Conditt, David O. Ribble
Social Organization Of Neotoma Micropus, The Southern Plains Woodrat, Sarah A. Conditt, David O. Ribble
David O Ribble
This study described the social organization of Neotoma micropus, the southern plains woodrat, using radiotelemetry. We studied woodrats from September 1994 through April 1995 at the Urban Wilderness Reserve in S Bexar County, Texas. Sixteen individuals (three adult males, 11 adult females, and two subadult males) were radiocollared and located in the evening or early morning duringJanuary and February. Seventy-four percent of female radiolocations and 57% of male radiolocations were from their respective nests. No more than one adult individual was observed at any nest at the same time. Males had significantly larger (x = 1899 m2) home ranges than …
Relative Intestine Length And Feeding Ecology Of Freshwater Fishes, David O. Ribble, M H. Smith
Relative Intestine Length And Feeding Ecology Of Freshwater Fishes, David O. Ribble, M H. Smith
David O Ribble
There is a significant relationship between the intestine length (Y) and total body length (X) for 11 species of freshwater fish (Y = 0.08X1.42). Sufficient variation exists about this relationship to indicate important differences among the species' diets. The diets for each species, ranked on a Trophic Index scale determined from literature data, are negatively rank order correlated with the mean relative intestine lengths (rs = -0.67). There is no significant rank order correlation between the Trophic Indices determined from data on stomach contents and the mean relative intestine lengths for fish from a single creek.
Social Organization Of The Eastern Rock Elephant-Shrew (Elephantulus Myurus) : The Evidence For Mate Guarding, David O. Ribble, Michael R. Perrin
Social Organization Of The Eastern Rock Elephant-Shrew (Elephantulus Myurus) : The Evidence For Mate Guarding, David O. Ribble, Michael R. Perrin
David O Ribble
Understanding the costs and benefits of defending solitary females, or mate guarding, may be the key to understanding the evolution of monogamy in most mammals. Elephant-shrews, or sengis, are a unique clade of small mammals that are particularly attractive for studies of mate guarding. We studied the spatial organization of Eastern Rock Sengis (Elephantulus myurus) in KwaZulu-Natal, South Africa, from August – December 2000. Our objectives were to describe the home ranges of males and females using radiotelemetry, noting the sizes and overlap of adjacent ranges and how the spatial organization changes through time. Males and females were spatially associated …
The Round-Eared Sengi And The Evolution Of Social Monogamy: Factors That Constrain Males To Live With A Single Female, Melanie Schubert, Neville Pillay, David O. Ribble, Carsten Schradin
The Round-Eared Sengi And The Evolution Of Social Monogamy: Factors That Constrain Males To Live With A Single Female, Melanie Schubert, Neville Pillay, David O. Ribble, Carsten Schradin
David O Ribble
Animal dispersion in space and time results from environmental pressures, and affects the outcome of a species’ social organization. When females are solitary, males may either roam or be pair-living. We studied possible environmental influences affecting the social organization of the round-eared sengi (Macroscelides proboscideus) in a semi-desert in South Africa, using trapping and radio-tracking across 2.5 yr. Adult sex ratios did not deviate from 1:1 and we found no indication of sexual dimorphism in body mass. Females maintained exclusive areas, which had little overlap (<4%) with neighbouring females (NF), and males overlapped predominately only with the home range of single females. Generally, inter- and intra-sexual overlap with neighbouring individuals was low (3–6%) for both sexes, indicating territoriality and pair-living. Pairs were perennial and territories were maintained year-round. However, males generally maintained much larger areas than females, which were sensitive to population density. Male space use appeared to be primarily limited by the presence of neighbouring males. Female home ranges were smaller-sized despite changes in population density, possibly for energetic efficiency. Some paired males attempted to take over widowed females, but shifted back to their original home range following the intrusion of an un-paired male. We conclude that social monogamy is the predominant social organization in round-eared sengis in a semi-desert that may have resulted from females living solitarily in small exclusive territories, balanced sex ratios, and from a low variation of body mass between males.
Effects Of Cutting Ashe Juniper Woodlands On Small Mammal Populations In The Texas Hill Country, K A. Schnepf, J A. Heselmeyer, David O. Ribble
Effects Of Cutting Ashe Juniper Woodlands On Small Mammal Populations In The Texas Hill Country, K A. Schnepf, J A. Heselmeyer, David O. Ribble
David O Ribble
We studied the effects of cutting Ashe juniper (Juniperus ashei Bucholz) woodlands on populations of small mammals at Friedrich Wilderness Park, north of San Antonio, Texas. Three patches of juniper ranging from 1.8 ha to 2.4 ha were cut to provide habitat for endangered black-capped vireos (Vireo atricapillus Woodhouse). We trapped small mammals along transects placed in the treated patches and in untreated areas of the park from October 1995 to May 1996 and again from October 1996 to March 1997. Three species of small mammals were trapped, but Peromyscus pectoralis Osgood (white-ankled mouse) was the most common species captured. …