色情视频

In hundreds of carefully organized filing cabinets and metal racks on the second floor of the South Life Sciences building, the extensive history and staggering variety of the natural world springs to life in 色情视频鈥檚 Biodiversity Museum.

Together, biology professors Marshal Hedin and Kevin Burns, biology professor emeritus Mike Simpson, and vertebrate collections manager Mike Van Patten curate and preserve the more than 100,000 specimens in the 色情视频 Biodiversity Museum.

What is the 色情视频 Biodiversity Museum?

Mike Simpson (MS): The 色情视频 Biodiversity Museum collects and maintains biological specimens to document biodiversity locally and globally. The collection includes 55,000+ specimens of insects, spiders, and their relatives; 15,000+ fish; 14,000+ amphibians, lizards, & snakes; 2,900+ mammal specimens; and 3,000+ birds.

The 色情视频 Biodiversity Museum also includes the 色情视频 Herbarium and the 色情视频 Greenhouse, managed by biology professor Lluvia Flores-Renter铆a and instructional support staff Bob Mangan, respectively. The herbarium houses an additional 25,000+ plant and algae specimens and the greenhouse contains over 1,000 specimens of live plants.

Why are these specimens useful?

MS: Plant and animal collections are no longer static things only filed away in cabinets. Increasingly, the collection information of biological specimens is stored in a database. This means that all of the information recorded at the time of collection 鈥� species name, locality (including latitude/longitude), habitat, and associated species 鈥� are electronically available to the public or for scientists to do research studies.

Such data is particularly important for rare and endangered species, to evaluate past and current distributions and population size. In addition, changes in the timing of reproduction can be assessed from the records of biological collections. This can entail studying the changes in flowering time or insect activity over the decades, to determine, for example, if the flowering and fruiting times of plants or the emergence and activity of insects and relatives are changing with increasing temperature due to climate change.

In addition to its physical specimens, the 色情视频 Biodiversity Museum also serves as a repository for preserved tissue collections that may be used to extract and sequence DNA. These tissue collections are carefully numbered and associated with a physical specimen. Given that DNA sequence data are essential for studying the evolution of life, these tissue collections have become increasingly important in scientific research.

If the identity of a particular species were ever in question, experts could verify it by visiting the collected specimen. Or, if there were ever any changes in the naming and classification of a species due to new analysis, these specimens could be updated accordingly.

How has the 色情视频 Biodiversity Museum helped advance science?

MS: The collections have facilitated the identification of quite a few species novel to Western science like  and a vivid yellow . In any scientific publication documenting a new species, a specimen is required to be deposited at a scientific institute, like our museum. 

One example of the importance of biological collections in our 色情视频 Biodiversity Museum is the plant species . This plant, collected only one time and in a single locality in 1931, was presumed extinct as it had not been seen since that initial collection.

However, in May 2010 Patrick McConnell, a former student at 色情视频, collected a  in Carlsbad, which he brought to the 色情视频 Herbarium. After perusing the literature, I  that McConnell鈥檚 specimen was indeed the missing species, one not found in nearly 80 years. Other specimens of it were subsequently discovered, some of which had been sitting unknown in herbaria around the state. Cryptantha wigginsii is now listed as  in California.

Additionally, 色情视频 graduate students and faculty members Annalisa Berta, Eric Ekdale, Ted Cranford, and the San Diego Natural History Museum鈥檚 Tom Dem茅r茅 recently dissected the head of a gray whale (Eschrictius robustus). They published some of the first and most comprehensive studies of the anatomy of this gray whale in a handful of articles in 2015. The skull, dentaries and right baleen rack from this dissection are now part of the Mammal Collections at the 色情视频 Biodiversity Museum.

What are some of the most special specimens in the collection? 

MS: Seventy-three of the plant specimens were collected on or before 1897, the year that 色情视频 was founded as the San Diego Normal School. The oldest specimen is a fern, Botrychium dissectum, collected in 1874 in Canada.

Of local interest are nine specimens collected by Laura F. Kimball, who was a fern collector and daughter of one of the first settler families in National City.

One specimen in particular, Kimball #224, was collected on June 7, 1897, the year of the founding of what is now 色情视频. Laura Kimball collected this plant at Stonewall Mine, in the Cuyamaca Mountains of San Diego County. This specimen is an aquatic fern named Marsilea vestita (water-clover). The paper to which the plant is attached has yellowed over the years, but the plant itself, measuring 8 inches across, is in very good shape, with numerous 4-leaf clover-like leaves and still bearing the round 鈥渟porocarp鈥� reproductive structures at the base, characteristic of this plant. 

These plant specimens are pressed and dried when collected, then mounted, today onto a sheet of acid-free paper with a label and barcode affixed. Plant specimens, if properly dried and kept free of humidity and insects, can last for hundreds of years. They can retain much of their form, as the cellulose of plant cell walls is a pretty resilient material. In fact, tissues of the plant, including pollen grains, can be removed from the specimen and studied, e.g., utilizing an electron microscope. 

How can people engage with the 色情视频 Biodiversity Museum?

MS: We periodically open the doors of the collections of the 色情视频 Biodiversity Museum to the public. Our next planned event is Friday, Feb. 10, 2023 in celebration of Darwin Day which celebrates the birth of Charles Darwin, the forefather of evolutionary biology. We welcome the community to observe displays of many examples of our diverse collections of animals and plants on that day. Come see how we preserve and document the tremendous diversity of life! 

IF YOU GO:

色情视频 Biodiversity Museum Open House

Feb 10, 9 a.m.-1:00 p.m.

South Life Sciences 267 and 269