scholarly journals Molting and body coloration of the Common Crossbill Loxia curvirostra in Aomori Prefecture, Japan

2012 ◽  
Vol 24 (2) ◽  
pp. 62-71
Author(s):  
Jun-ichi EBINA ◽  
Katsura MIKAMI
Keyword(s):  
Loxia Curvirostra ◽  
Body Coloration ◽  
The Common ◽  
Common Crossbill ◽  
Aomori Prefecture

Genetic monogamy in the Common Crossbill (Loxia curvirostra)

2008 ◽  
Vol 149 (4) ◽  
pp. 651-654 ◽  
Author(s):  
Oddmund Kleven ◽  
Bjørn-Aksel Bjerke ◽  
Jan T. Lifjeld
Keyword(s):  
Loxia Curvirostra ◽  
Genetic Monogamy ◽  
The Common ◽  
Common Crossbill

scholarly journals The Common Crossbill, Loxia curvirostra, Linn. [Pl. 200]

1841 ◽  
Vol 3 ◽  
pp. 186-190
Author(s):  
John James Audubon
Keyword(s):  
Loxia Curvirostra ◽  
The Common ◽  
Common Crossbill

scholarly journals On the brink of extinction: a new freshwater amphipod Jesogammarus acalceolus (Anisogammaridae) from Japan

ZooKeys ◽  
2021 ◽  
Vol 1065 ◽  
pp. 81-100
Author(s):  
Ko Tomikawa ◽  
Naoya Kimura
Keyword(s):  
New Species ◽  
Common Ancestor ◽  
Amphipod Species ◽  
Male Antenna ◽  
Molecular Phylogenetic Tree ◽  
Molecular Phylogenetic ◽  
Freshwater Habitats ◽  
High Conservation ◽  
The Common ◽  
Aomori Prefecture

Freshwater habitats, especially cold springs, are environments in which the risk of extinction faced by organisms remains high due to human activities. To conserve endangered species, it is important to describe and name them. Here, a new, endangered freshwater anisogammarid amphipod species, Jesogammarus (Jesogammarus) acalceolussp. nov., found in a spring in Aomori Prefecture, Japan, is described which is potentially the sole remaining habitat of this species. Both morphological and molecular phylogenetic results strongly support the nesting of the new species within Jesogammarus. Jesogammarus (J.) acalceolussp. nov. is the first species of genus Jesogammarus that was found to lack a calceolus, a sensory organ located on male antenna 2. Thus, the diagnostic criteria for this genus required amendment. A reconstruction of ancestral calceoli, based on a molecular phylogenetic tree, revealed that the common ancestor of Jesogammarus possessed calceoli, which were secondarily lost in J. (J.) acalceolussp. nov. Our results indicate that this new species, which is key to clarifying the evolution of the calceolus, is of high conservation significance.

scholarly journals On the Brink of Extinction: A New Freshwater Amphipod Jesogammarus Acalceolus (Anisogammaridae) From Japan

2021 ◽  
Author(s):  
Ko Tomikawa ◽  
Naoya Kimura
Keyword(s):  
New Species ◽  
Extinction Risk ◽  
Amphipod Species ◽  
Male Antenna ◽  
Molecular Phylogenetic Tree ◽  
Molecular Phylogenetic ◽  
Freshwater Habitats ◽  
High Conservation ◽  
The Common ◽  
Aomori Prefecture

Abstract Freshwater habitats, especially cold springs, are environments in which the extinction risk faced by organisms remains high due to human activities. The extinction risks faced by many species go unrecognized prior to their extinction. To conserve endangered species, it is important to describe and name them. Here, we describe a new, endangered freshwater anisogammarid amphipod species, Jesogammarus (Jesogammarus) acalceolus sp. nov., found in a spring in Aomori Prefecture, Japan, which is potentially the sole remaining habitat of this species. Both morphological and molecular phylogenetic results strongly support the nesting of the new species within Jesogammarus. Jesogammarus (J.) acalceolus sp. nov. is the first species of genus Jesogammarus that was found to lack a calceolus, a sensory organ located on male antenna 2. Thus, the diagnostic criteria for this genus required amendment. A reconstruction of ancestral calceoli, based on a molecular phylogenetic tree, revealed that the common ancestor of Jesogammarus possessed calceoli, which were secondarily lost in J. (J.) acalceolus sp. nov. Our results indicate that this new species, which is key to clarifying the evolution of the calceolus, is of high conservation significance.

scholarly journals Ecology of a Two-barred Crossbill (Loxia leucoptera) irruption to Norway in 2019–20: altitudinal migration and interspecific habitat differences

2021 ◽  
Vol 44 ◽  
pp. 19-30
Author(s):  
Svein Dale
Keyword(s):  
Breeding Season ◽  
Bird Species ◽  
Open Forest ◽  
Habitat Differences ◽  
Seed Eating ◽  
The Common ◽  
Analyse Data ◽  
Common Crossbill ◽  
One Year ◽  
Se Norway

Cover photo: A male Two-barred Crossbill (Loxia leucoptera). Photo: Frode Falkenberg.    Two-barred Crossbills (Loxia leucoptera) have cyclic irruptions to Norway, but are generally uncommon and breeding is rare. Here I analyse data on a large irruption occurring in 2019–20 to assess the magnitude of the irruption and the ecological niche of the species. The irruption lasted one year, starting in July 2019 and ending in June 2020. Total numbers reported by birdwatchers to the website of the National Biodiversity Information Centre in Norway were ca. 7,000 individuals. Breeding indications were reported from nearly 100 sites. Analyses of elevation of records indicated that birds were often seen at low elevations before the breeding season in February–June, but moved to higher elevations during the breeding season. In a focal study area in SE Norway, breeding season surveys along elevational gradients indicated that Two-barred Crossbills occurred at higher elevations, and often close to summits of hills, perhaps representing preferences for more open forest habitats. Two-barred Crossbills often co-occurred with other seed-eating bird species, but presence was more closely related to numbers of Common Redpoll (Acanthis flammea), than to Eurasian Siskin (Spinus spinus) or cogeneric Common Crossbill (L. curvirostra). Similarly, the Common Redpoll also increased strongly in abundance with elevation, whereas the other two species did so to a lesser degree. These data suggest that the Two-barred Crossbill favors montane forests during the breeding season, and thereby has a different niche than the Common Crossbill which is distributed more widely across all elevations.

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