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Full-Text Articles in Life Sciences
A Late Quaternary Pollen Record From Cedarburg Bog, Wisconsin, Glen G. Fredlund, James R. Brozowski, Jong Woo Oh
A Late Quaternary Pollen Record From Cedarburg Bog, Wisconsin, Glen G. Fredlund, James R. Brozowski, Jong Woo Oh
Field Station Bulletins
Late Quaternary (from the last glaciation to present) forest history is inferred from the Cedarburg Bog fossil pollen record. Analysis of fossil pollen samples extend over 4 meters of continuous core recovered from near the center of the bog. The deepest and oldest of the fossil pollen assemblages (ca. 12,000 years ago) suggest open spruce woodlands unlike any in the contemporary boreal ecosystem. Pollen from the Pleistocene-Holocene transition (11,000 years ago) is marked by a number of abrupt changes in forest composition related to rapid climate change, species immigration, and progressive soils and ecosystem maturation. By 9,000 years ago most …
Life Cycle Patterns In Wisconsin Spiders, Joan P. Jass
Life Cycle Patterns In Wisconsin Spiders, Joan P. Jass
Field Station Bulletins
Five life cycle patterns in spiders are described and examples given. The most common pattern, maturation and mating in spring and early summer, is elaborated with a detailed description of the seasonal development of Philodromus cespitum. The four other patterns are exemplified by the following southeastern Wisconsin species: Argiope trifasciata--fall mating, Centromerus sylvaticus-- winter mating, Trochosa terricola--two mating seasons, and Pholcus phalangioides--year round mating.
Amphipods (Exclusive Of Pontoporeiidae) Of Southeastern Wisconsin, Joan Jass, Barbara Klausmeier
Amphipods (Exclusive Of Pontoporeiidae) Of Southeastern Wisconsin, Joan Jass, Barbara Klausmeier
Field Station Bulletins
Eight species of amphipods in the families Crangonyctidae (five species), Gammaridae (two species) and Hyalellidae (one species) are recorded here from a 21 county area in southeastern Wisconsin. Excluded from this survey were members of the family Pontoporeiidae, deepwater species previously collected in this region only from Lake Michigan and Green Lake (Juday and Birge 1927). In the species treatments we combine data from our fieldwork with information given in Bousfield (1958), Holsinger (1972), and other literature as cited.