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

Reproductive strategy, spawning induction, spawning temperatures and early life history of captive sicklefin chub Macrhybopsis meeki-Data

Macrhybopsis reproduction and propagule traits were studied in the laboratory using two temperature regimes and three hormone treatments and which methods produced the most spawns. Only sicklefin chub (M. meeki) spawned successfully although sturgeon chub (M. gelida) released unfertilized eggs. All temperature and hormone treatments produced M. meeki spawns, but two treatments had similar success rates at 44 and 43%, consisting of a constant daily temperature with no hormone added, or daily temperature fluctuations with hormone added to the water. Spawns consisted of multiple successful demersal circular swimming spawning embraces interspersed with circular swims without embraces. The most spawns observed for one...

Types: Citation, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Columbia Environmental Research Center, Lower Missouri River, Missouri, Missouri River, USGS Science Data Catalog (SDC), All tags... batch spawning, captive spawning, environmental health, fecundity, lithopelagophil, Fewer tags

Female Faxonius (formerly Orconectes) quadruncus broodstock for toxicity testing

Broodstock, individual Faxonius quadruncus, were collected for culturing eggs until hatch. Hatchling crayfish were to be used in toxicity testing to assess hazards of metals mixtures to young Faxonius quadruncus

Categories: Data; Tags: Biota, Faxonius quadruncus, Little St. Francis River, Missouri, Rock Creek, All tags... St. Francis River drainage, USA, USGS Science Data Catalog (SDC), eggs, fecundity, hatchlings, toxicity testing, Fewer tags