In light of this, the Xerces Society and others have led a recent push to provide formal protections for several species of bumblebee. Typically thought to reproduce only in vernal pools, researchers observed California tiger salamanders breeding in cattle stock ponds, intermittent creeks and rain-filled excavated depressions.
Further investigation is needed to determine if these atypical breeding sites result in any reproductive success, as some have limited hydroperiods that may not be conducive to California tiger salamander metamorphosis.
However, this study provides insight for the potential role of reproductive plasticity in the face of vernal pool habitat loss. For development projects within the range of the California tiger salamander, this study identifies additional habitat features that should be assessed when identifying and addressing potential impacts to this listed species.
We would like to thank the CDFW editorial staff for their hard work on this special issue. We also want to thank and acknowledge the researchers and authors of the articles, whose hard work to understand these imperiled species is helping bring them closer to recovery.
We look forward to the continued contributions in the next decade to come. As Californians continue to face devastating wildfires, researchers are lending their expertise by producing data to inform fire policy. CDFW contributed an article to a recent special-edition journal featuring fire studies from around the world.
The results of the study support the value of prescribed burning in advancing ecological and societal objectives including wildlife diversity and human health and safety.
Brett Furnas. Furnas and his team conducted the research by analyzing data from 1, camera traps that have been placed by scientists in Northern California forests since Unlike high intensity fires which tend to eradicate all trees in a given area, low intensity fires tend to thin out forests and burn mostly the understory.
Prescribed burning mimics the effects of low intensity fires which are associated with ecological benefits. Other research has shown that mixed intensity fires in California have ecological benefits for birds, bees and plants. A male adult monarch on a milkweed leaf. The population of migratory western monarchs has declined more than 99 percent since the s when millions overwintered in groves along the California coast.
By the mids, the population had dropped to the hundreds of thousands. Just a few years ago, scientists estimated there were only 30, left. Now there are only about 2, migratory western monarchs left statewide. They ultimately migrate into other states west of the Rocky Mountains to breed.
The drastic population decline has been attributed to several factors including habitat loss, climate change and exposure to pesticides. Development is also reducing nectar resources. Climate change may be causing monarchs to leave overwintering sites earlier than usual and before milkweed, their host plant, has fully bloomed. These monarchs are encouraged to stick around by a non-native milkweed which allows them to breed all throughout the year.
California is the most biodiverse state in the nation, and CFWJ prides itself in contributing to the conservation and management of the state's natural resources. The Science Institute now houses the Journal and supports its online presence and expansion of its state-wide reach and impacts. It also encourages the peer-reviewed journal to serve as a primary outlet for the CDFW science community to share their work. All information published in CFWJ is considered public domain.
Preservation and archival by Portico opens in new tab. This is an open access journal. Users have the right to read, download, copy, distribute, print, search, or link to the full texts of articles in this journal, crawl them for indexing, pass them as data to software, or use them for any other lawful purpose.
Using lidar data, the team identifies important predictors for post-fire woody canopy condition, which highlights the importance of high-resolution airborne mapping technology for informing management decisions. The latest issue of California Fish and Game , Vol. In A very long term tag recovery of a California scorpionfish Scorpaena guttata PDF , Roberts and Hanan report the remarkable recovery of a tagged scorpionfish that had been at liberty far longer than any previously recaptured scorpionfish.
The recovery was made during a four-year mark-recapture study on nearshore groundfish off southern and central California. More than 32, fish were recaptured, with an average of The study results indicate that scorpionfish demonstrate strong site fidelity, given that a majority of the fish were recaptured within 5k of their original tagging site. The scorpionfish that is the subject of the article was tagged in It had been at liberty for nearly 14 years 5, days.
Another paper reports on a method for estimating the age of roosterfish using dorsal fin spines PDF. According to authors Chavez-Arellano et. However, little is known about its biology, ecology, and movement patterns. The authors embarked upon a study to assess which sections of roosterfish dorsal fin spines have the most legible indicators of growth for use in future aging studies.
Their work provides the initial basis from which future aging studies can be conducted. Finally, Primary and secondary nursery areas for leopard and brown smoothhound sharks in San Francisco Bay, California PDF , summarizes a year study to determine primary and secondary nursery habitats for leopard and brown smoothhound sharks within South San Francisco Bay, adding new knowledge to the biology of both species.
We look forward to witnessing the contributions of the next installment. CDFW Photo. Issue 3 features a rather dignified-looking desert spiny lizard Sceloporus magister on the cover.
It is one of 15 species captured and documented by Cummings et. The finding were combined with a review of scientific literature to document the biological diversity of the area in comparison to other desert habitats. Skalos et. Though great horned owl nest sites are known to be diverse, little documentation exists to support some of these observations.
In fact, Skalos et. California Fish and Game provides important contributions to the existing body of scientific knowledge. Also in this issue, Overton et al. Other papers published in this issue look at a predictive model for commercial catch of white seabass Atractoscion nobilis ; fecundity and reproductive potential of wild female Delta Smelt Hypomesus transpacificus ; and updated information on the length-weight relationships LWR and length-length relationships LLR and condition factors for pelican barracuda Sphyraena idiastes in the Gulf of California.
The first article in this series comes from Volume I, Issue I, dated It asserts that natural resources must be conserved for the use and enjoyment of the public.
0コメント