Reproductive ecology data for female Agassiz's desert tortoises (Gopherus agassizii) in Joshua Tree National Park, USA

These data were compiled to evaluate the reproductive ecology of Agassiz's desert tortoises (Gopherus agassizzi) in the Sonoran Desert of California using two populations within Joshua Tree National Park, including five reproductive seasons that spanned 20 years (1997-1999, 2015-2016). Compared to their conspecifics inhabiting the Mojave Desert, the reproductive ecology of G. agassizii in the Sonoran Desert is understudied. Climatic variation between the two deserts can affect reproductive ecology, including fecundity and clutch phenology. Mature female tortoises (straight-line carapace length ≥ 20 cm) outfitted with radiotransmitters were located and X-radiographed approximately every 10-14 days during the reproductive...

Categories: Data; Tags: Agassiz's desert tortoise, California, Ecology, Geography, Gopherus agassizii, All tags... Information Sciences, Joshua Tree National Park, Sonoran Desert, USGS Science Data Catalog (SDC), Wildlife Biology, X-radiography, X-ray egg width, biota, climatic variation, clutch number, clutch phenology, clutch size, ecology, egg production, egg size, fecundity, field monitoring, field sampling, nests, reproductive ecology, size, tortoise, Fewer tags

Humpback chub spring and fall capture histories in the Little Colorado River, 2009-2019

These data were compiled to examine rates of skipped migration in adult humpback chub that spawn in the Little Colorado River (LCR). These data include mark-recapture information from the lower 13.56 kilometers of the LCR and from the Colorado River, from river kilometer 105.5-145.7 downstream of Glen Canyon Dam. Data also include detections from a multiplexer array (MUX) that is located in the LCR and from submersible PIT tag antennas that are deployed in parts of the Colorado River. These data are capture histories that include both spring and fall sampling events that occurred between spring 2009 and spring 2019. Capture histories can include information about size (small adults being 200-249mm total length and...

Tags: Aquatic Biology, Arizona, Colorado River, Ecology, Geography, All tags... Glen Canyon Dam, Grand Canyon, Information Sciences, Little Colorado River, Remote Sensing, USGS Science Data Catalog (SDC), Water Resources, Wildlife Biology, bioenergetics, biology, biota, capture, capture histories, capture-recapture studies, detections, development (biology), ecological processes, energetics tradeoffs, field sampling, fish, growth, humpback chub, mark-recapture, migration (organisms), models, movement rates, multiplexer array (MUX), organism growth and development, population and community ecology, population studies, ripeness, sampling, sampling events, sex (gender), sexing (plants & animals), size, skipped migration, spawn, submersible PIT tag antennas, survival, yearly variability, Fewer tags

Mojave Desert Tortoise (Gopherus agassizii) Morphometrics and Egg Data from Seven Sites across the Mojave, (1997-2002)

These data were acquired from 7 study sites distributed across the range of Gopherus agassizii. Data were collected from 1997 to 2002 as part of three separate studies, although data were not collected at all sites in each year. Radio-transmitters were attached to the carapace of 151 females and VHF radio-telemetry was used to relocate animals to assess reproductive status. Egg production was determined from X-radiographs taken weekly/biweekly intervals (depending on the study) using a portable X-ray machine between April and July or August of each year. In addition, the mean carapace length (MCL) of each tortoise was measured at each time of capture or recapture using calipers (mm). A nesting event was recorded...

Categories: Data; Tags: Area 31, Bird Spring Valley, California, Gopherus agassizii, Lake Mead National Recreation Area, All tags... Mojave Desert, Mojave National Preserve, Mojave desert tortoise, Nevada, Pahcoon Flat, Piute Valley, Redcliffs, Sandstone Mountain, USGS Science Data Catalog (SDC), Utah, Wildlife Biology, X-radiography, biological production, biota, body size, climate change, climatic variability, climatic variation, clutch size, ecology, ecosystem functions, eggs, environmental effects, environmental variables, field inventory and monitoring, radiography, reproduction, reproductive output, reproductive status, reptile, reptiles, size, tortoises, total annual egg production, wildlife, wildlife biology, Fewer tags

Agassiz's desert tortoise and egg data from the Sonoran Desert of California (1997-2000, 2015-2018)

These data were compiled to evaluate reproductive output of Agassiz's desert tortoises (Gopherus agassizzi) in relation to environmental and individual-level variables. We collected data from four study sites in the Sonoran Desert of California, including two separate populations within Joshua Tree National Park, one population located on the northern versant of the Orocopia Mountains, and one population located at the extreme western end of the Coachella Valley. These data represent eight reproductive seasons that spanned over 20 years (1997-2000, 2015-2018). These data were compiled and added to a larger database with additional records collected by other scientists from eight other study sites in order to detect...

Tags: Agassiz's desert tortoise, Barrow Plot, California, Cottonwood Mountains, Ecology, All tags... Geography, Gopherus agassizii, Information Sciences, Joshua Tree National Park, Joshua Tree Wilderness, Mesa, Mesa Wind Farm, Orocopia Mountains, San Gorgonio Pass, Shavers Valley, Sonoran Desert, USGS Science Data Catalog (SDC), Wildlife Biology, X-radiography, biological production, biota, body size, climate change, climatic variability, climatic variation, clutch size, ecology, ecosystem functions, eggs, environmental effects, environmental variables, field inventory and monitoring, radiography, reproduction, reproductive output, reproductive status, reptiles, size, tortoises, total annual egg production, wildlife, wildlife biology, Fewer tags

Injury and abnormality data for southwestern pond turtles (Actinemys pallida) from 3 sites along the Mojave River, California from separate surveys in 1998-1999 and 2017-2019

These data were compiled to assess the size, structure, and health of various populations of Actinemys pallida along the length of the Mojave River. Objective(s) of our study were to determine the extent of injuries and abnormalities within our Actinemys pallida populations (including statistical analyses comparing injuries with turtle sex and size) and estimate the cause(s) of the injuries and abnormalities. These data represent injuries and abnormalities from the effects of physical hazards encountered by turtles in their habitats. These data were collected in the Mojave Desert of California at three separate study sites along a length of the Mojave River in San Bernardino County between May 1998–October 1999...

Categories: Data; Tags: Actinemys pallida, Afton Canyon Area of Critical Environmental Concern, Aquatic Biology, California, Camp Cady Wildlife Area, All tags... Ecology, Geography, Information Sciences, Mojave Desert, Mojave River, San Bernardino County, USGS Science Data Catalog (SDC), Wildlife Biology, abnormalities, biogeography, biota, capture, datasets, ecology, field data, field inventory and monitoring, habitats, health, hoop traps, injuries, physical health, population and community ecology, sexing (plants & animals), size, structures (animal-constructed), traps, turtles, Fewer tags