WebTo distinguish his new species concept from the older one in which geographical replacements might be named as separate species, Kleinschmidt called his theory of variation the ... The Rassenkreis became simply the species or polytypic species, with its geographic races being subspecies, whereas the Artenkreis became the superspecies, … Webspecies, in biology, classification comprising related organisms that share common characteristics and are capable of interbreeding. This biological species concept is widely used in biology and related fields of study. …
Species concept and speciation - ScienceDirect
WebPhenetic species concepts are based on this external similarity among organisms. ... A final problem is the existence of polytypic species that can contain a number of distinct phenotypic forms, ... WebMay 4, 2024 · In the 1970s, clones of the two subspecies of Ophiostoma novo-ulmi, subsp. americana (SSAM) and subsp. novo-ulmi (SSNU) began to overlap in Europe, resulting in hybrid swarms. By 1983–1986, hybrids with high, SSAM-like growth and pathogenic fitness comprised ~75% of popula-tions at Limburg, Netherlands and Orvieto, Italy. We resampled … gleaners portland
POINTS OF VIEW: A CONTROVERSY IN SPECIES CONCEPTS
WebMar 5, 2014 · The Polytypic Species Concept Revisited. Many mergers in the early days of the biological species concept were not based on strong biological evidence. We have … WebMar 1, 2024 · Species are one of the basic units to compare in almost all fields of biology, from anatomy to behavior, development, ecology, evolution, genetics, molecular biology, … WebThe biological species concept defines a species in terms of biological factors such as reproduction, taking into account ecology, geography, and life history; it remains an important and useful idea in biology, particularly for animal speciation. Despite acceptance and approval of his species definition, his input did little to resolve the ... gleaners scholarship