Odnosi med telesno velikostjo, razširjenostjo in gostoto gnezdečih ptic v Sloveniji

Abstract

V prispevku predstavljam odnos med telesno velikostjo, gostoto in razširjenostjo gnezdilk na območju Slovenije. Ugotovitve so bile skladne z obema preizkušenima hipotezama: (1) Gostota (abundanca) gnezdečih parov je bila v značilni in negativni korelaciji s telesno velikostjo vrste. Ugotovitev je v skladu s hipotezo, da se omejena količina naravnih virov med velikimi vrstami porazdeli med manj osebki kot med telesno majhnimi vrstami. Posledica je, da so telesno manjše vrste v povprečju številčnejše in pogostejše kot telesno velike vrste. (2)Korelacija med razširjenostjo vrst in njihovo gostoto je bila tesna. To pomeni, da so imele vrste z večjo razširjenostjo tudi višjo gostoto (abundanco). Ugotovitev je v skladu z domnevo, da imajo bolj razširjene vrste širšo ekološko nišo in izkoriščajo širši spekter naravnih virov. Nespecializiranost jim omogoča poselitev različnih habitatnih tipov in s tem večjo razširjenost. Dostop do širšega spektra naravnih virov jim omogoča višjo naselitveno gostoto in posledično višje število gnezdečih parov.

Keywords

biologija;zoologija;ornitologija;ptice;Aves;telesna velikost;razširjenost;številčnost;gnezdilke;Slovenija;ne zaključna dela;

Data

Language:	Slovenian
Year of publishing:	2002
Typology:	1.01 - Original Scientific Article
Organization:	UM PEF - Faculty of Education
Publisher:	Društvo za opazovanje in proučevanje ptic Slovenije
UDC:	598.2(497.4)
COBISS:	12481800
ISSN:	0351-2851
Parent publication:	Acrocephalus
Views:	1502
Downloads:	54
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Relationship between body size, distribution and abundance of breeding birds in Slovenia
Secondary abstract:	Through the analysis of empirical data on the breeders of Slovenia, relations between their distribution, abundance and body size were being assessed. Two hypotheses were tested: 1) species with greater distribution have greater abundance than species limited to smaller geographical regions: 2) larger species have lower average abundance than smaller. The relationship between distribution and abundance of the species breeding in Slovenia was in accordance with the exponent growth, while the correlation coefficient was high and positive (R=0,75). Correlation between distribution of species and number of breeding pairs was also significant and positive (R=0,88). Larger species had smaller average abundance and therefore smaller number of breeding pairs than smaller birds. Correlation between body size and abundanceof pairs was negative (r=-0,41). The difference in abundance of pairs between species with larger and smaller body size is presumably the result of different access to natural resources (mainly food). In larger species, the same quantity of limited natural resources is distributed among smaller number of individuals, while in small body size species this quantity is distributed among greater number of birds.
Secondary keywords:	biology;zoology;ornitology;birds;Aves;body size;distribution;abundance;breeding birds;Slovenia;Ornitologija;Ptice;Slovenija;
URN:	URN:NBN:SI
Type (COBISS):	Scientific work
Pages:	str. 123-128
Volume:	ǂLetn. ǂ23
Issue:	ǂšt. ǂ113/114
Chronology:	2002
ID:	1747065