2 edition of Morphometric and ecological differentiation of Atlantic island chaffinch (Fringilla spp.) populations. found in the catalog.
Morphometric and ecological differentiation of Atlantic island chaffinch (Fringilla spp.) populations.
Michael David.* Dennison
Written in English
|The Physical Object|
|Number of Pages||136|
Differentiation after colonisation: founder events, drift and selection. Island systems are ideal models for studying the processes involved in population differentiation and speciation, because each colonisation event can be viewed as an independent evolutionary episode (Clegg, ). Individuals colonising a new island are a subset of the. Ecological divergence. The Galápagos sea lion and the Galápagos fur seal were sampled extensively across their distribution ranges. Stable isotope analysis was used to provide insight into foraging ecology. δ 15 N values reflect differences in trophic levels of prey items, whereas δ 13 C values indicate foraging mode [pelagic or benthic: see e.g. [23,24]].
Callinectes sapidus is native to the Atlantic coasts of the Americas. In the Mediterranean, it appeared around and though that it is established in East Mediterranean waters, relevant studies are limited. The aim of the present study is to report quantitative and qualitative data on the blue crab’s biology and ecology in its non-native range, that are indispensable for management purposes. lips and jaws — is thought to underlie their ecological differentiation, specialization and, ultimately, speciation. The Midas cichlid species complex (Amphilophus spp.) of Nicaragua provides one of the few known examples of sympatric speciation where species have rapidly evolved different but parallel morphologies in young crater lakes.
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Cultural evolution was assessed by computing distances among island syllable pools, based on presence or absence coding of syllables. Morphometric differentiation was assessed by computing average taxonomic distances among populations using data from Grant (P.
Grant. Biol. Linn. Soc. – ).Cited by: Congruence of morphometric and cultural evolution in Atlantic island chaffinch populations Article in Canadian Journal of Zoology 64(7) February with 20 Reads How we measure 'reads'.
These alternatives have different implications for the evolution of morphometric and plumage differentiation in island chaffinches. To determine the most likely colonization route, we estimated the phylogenetic relationships among island and continental subspecies of common chaffinch using sequences from four mtDNA genes (cytochrome b, ATPase Cited by: Atlantic Island populations of chaffinches do have larger beaks than mainland birds (Grant, ; Dennison & Baker, ), but this has not yet been explicitly linked to variation in song.
Although a comparison of common chaffinch song among 14 samples in the Atlantic region shows significant amounts of differentiation among regions, there is.
Results also indicate the existence of morphometric differences among islands that could be due to ecological features instead of island isolation. Atlantic island populations are well. Abstract. Chaflinches have differentiated within the last million years on the Canary Islands and the Azores.
All island populations differ more from mainland. Examples of sympatric speciation in nature are rare and hotly debated. We describe the parallel speciation of finches on two small islands in the Tristan da Cunha archipelago in the South Atlantic Ocean.
Nesospiza buntings are a classic example of a simple adaptive radiation, with two species on each island: an abundant small-billed dietary generalist and a scarce large-billed specialist. The common chaffinch is about cm ( in) long, with a wingspan of – cm (– in) and a weight of 18–29 g (– oz).
The adult male of the nominate subspecies has a black forehead and a blue-grey crown, nape and upper mantle. The rump is a light olive-green; the lower mantle and scapulars form a brown side of head, throat and breast are a dull rust-red. Macaronesia, a group of archipelagos (Azores, Madeira, Canary Islands and Cape Verde) in the Atlantic Ocean, is one of the global biodiversity hot-spots.
However, for species that occur throughout these archipelagos the extent of genetic and morphological differentiation between the archipelagos and mainland Iberia and Africa is often unknown.
Here we investigate phenotypic and. MORPHOMETRIC VARIABILITY IN CONTINENTAL AND ATLANTIC ISLAND POPULATIONS OF CHAFFINCHES (FRINGILLA COELEBS) Morphometric and ecological differentiation of Atlantic island chaffinch, Fringilla.
Identifying intraspecific units or stocks of a species with unique morphological characteristics has now become more powerful and enables a better management of these subunits of species and ensures better management and conservation of the fishery resources.
These morphometric characteristics typically show ontogenic changes in body shape particularly rapid at key life history stages. For. Moderated intralineage differentiation was also detected at the morphometric level.
As has been suggested for other Triatominae species, wing geometry is a quantitative trait, and its polymorphism is expected to respond to both environmental and genetic variation (Dujardin et al.,Dujardin et al.,Dujardin et al., b). The archipelago of the Azores is situated between latitudes 36°55′ and 39°43′N, and longitudes 24°46′and 31°16′W, about km from Europe and km from North America ().The Azores encompass nine islands and several islets of recent volcanic origin (with ages ranging from to 8 million years), which are spread over > km along a northwest–southeast line (França et al.
Diagnosing distinct evolutionary taxa requires careful assessment of genetic, morphological, ecological, and behavioral variation within and among populations. In this study, data on phenotype (mensural and plumage coloration), genotype (mitochondrial DNA control-region sequences), and distributional projections derived from ecological niche models, were used to investigate.
Abstract. Using microsatellite DNA variation, morphological measurements and sonagrams made from tape-recordings in the field, we examine the allopatric differentiation of six populations of the sharp-beaked ground finch, Geospiza difficilis, in the Galapagos ask how and why the populations became differentiated, and consider what the differences imply about speciation.
Lynch A., Baker ence of cultural and morphometric evolution in Atlantic island populations of chaffinches Can. Zool., 64 (), pp. Google Scholar. Atlantic island and neighboring continental chaffinch populations and measured a stan-dard suite of skeletal characters on each specimen (Baker, ).
The morphometric results differ both in magnitude and pattern from previous studies, and we suggest pop-ulation variability in island chaffinches is consistent with a neutral model of pheno.
Population structure studies play an increasingly integral role in conservation and management of marine mammal species. Genetic markers are commonly used; however, ecological markers (i.e.
chemical compounds) are a fairly recent and useful tool to investigate ecological management units. The objective of this study is to investigate the population structure of the Atlantic. The widespread common chaffinch (Fringilla coelebs) inhabits five of the seven Canary ces of the mitochondrial cytochrome b gene ( bp) revealed new insights into the systematics and phylogeography of this taxon.
Additionally, a set of microsatellite loci were analyzed to examine the structure of these populations. At higher levels of dispersal, ecological differentiation is lost and it becomes impossible for the mating cue to identify locally adapted prospective mates. More work is needed to establish, in relation to dispersal rules and cases of incomplete dominance, the conditions for stable ecological .The objective of this study was to analyse the differences in shape of the cephalothorax in four fishery stocks of sea-bob shrimp Xiphopenaeus kroyeri that are distributed on the east coast of Brazil, applying geometric morphometry as the analytical tool.
Samples were collected at the fishing ports of Caravelas (17°43′S 39°15′W), Vitória (20°15′S 40°14′W), Atafona (21°35′S As big as the ocean world is, it can be disturbed by small pieces of trash, much of which originates as litter on our city streets.
When it rains, trash flows into drains that lead to the Lake Worth Lagoon and other waterways. As the water continues out of the inlets and into the ocean, it carries the litter along with it. Pollution is a serious danger to marine mammals, fish, sea turtles, and.