Publication Type: | Journal Article |
Year of Publication: | 1982 |
Authors: | P. Holter |
Journal: | Oikos |
Volume: | 39 |
Pagination: | 213-227 |
ISBN Number: | 00301299 |
Abstract: | Resource partitioning in a guild of 13 Aphodius species (adults) from cattle dung was studied along two dimensions in time - season and age of dung pats - and two dimensions in space - distribution of beetles among pats and microdistribution within pats. Moreover, total respiration of the guild in relation to season was roughly estimated. Most data were from one site in northern Zealand, Denmark. The energy requirements of this coprophagous guild varied widely through the season. Even at the time of maximum activity, the beetles assimilated only about 0.2% of the energy in a dung pat; hence there is no evidence of competition for food at normal population densities. Neither did other results indicate within-guild competition, past or present. Features like (1) the contagious distribution of beetles on evenly spaced, identical pats, (2) the positive association between species, and (3) habitat specializations within pats may have evolved as adaptations facilitating intraspecific contacts in populations which are often sparse in relation to chances of mating. /// àðÑÂÿрõôõûõýøõ рõÑÂурÑÂþò ò óруÿÿõ ø÷ 13 òøôþò Aphodius (øüðóþ) ø÷ ÑÂúÑÂúрõüõýтþò úруÿýþóþ рþóðтþóþ ÑÂúþтð øÑÂÑÂûõôþòðûø ò ôòух òрõüõýýых ø÷üõрõýøÑÂÑ… - ò þтýþшõýøø ú ÑÂõ÷þýу ø òþ÷рðÑÂту ÑÂúÑÂúрõüõýтþò, ø ò ôòух ÿрþÑÂтрðýÑÂтòõýýых ø÷üõрõýøÑÂÑ… - ò þтýþшõýøø ú рðÑÂÿрõôõûõýøю öуúþò ò рð÷ýых úучðх ÑÂúÑÂúрõüõýтþò ø øх üøúрþрðÑÂÿрõôõûõýøю ò ÿрõôõûðх þôýþù úучø. ßþüøüþ ÑÂтþóþ ø÷üõрÑÂûø ÑÂуüüðрýþõ ôыхðýøõ óруÿÿы ò тõчõýøõ ÑÂõ÷þýð. ÃÂðøñþûьшõõ чøÑÂûþ ôðýýых ÿþûучõýþ ø÷ þôýþóþ üõÑÂтþþñøтðýøѠò áõòõрýþù ×õûðýôøø (Ãâ€Ã°Ã½Ã¸ÑÂ). Ã’ тõчõýøõ ÑÂõ÷þýð ÑÂýõрóøтøчõÑÂúøõ ÿþтрõñýþÑÂтø óруÿÿы úþÿрþфðóþò ÑÂøûьýþ òðрьøруют. Ãâ€Ã°Ã¶Ãµ ò ÿõрøþô üðúÑÂøüðûьýþù ðúтøòýþÑÂтø öуúø ðÑÂÑÂøüøûøруют þúþûþ 0,2% ÑÂýõрóøø ÑÂúÑÂúрõüõýтþò. ßþÑÂтþüу ýõт ôþúð÷ðтõÃȄ΄Âтò úþýúурõýцøø ÷ð ÿøшу ÿрø ýþрüðûьýþù ÿûþтýþÑÂтø ÿþÿуÃȄÂцøø. Ãâ€Ã‘€ÑƒÃ³Ã¸Ãµ рõ÷уûьтðты тðúöõ ÿþúð÷ыòðют þтÑÂутÑÂтòøõ úþýúурõýцøø òýутрø óруÿÿы ò ÿрþшûþü øûø àðÑÂтþÑÂщõü. âðúøõ чõрты, úðú 1. úþýтðóøþ÷ýþõ рðÑÂÿрõôõûõýøõ öуúþò ýð рðòýþüõрýþ рðÑÂÿþûþöõýýых øôõýтøчýых úучðх, 2. ÿþûþöøтõûьýыõ ðÑÂÑÂþцøðцøø üõöôу òøôðüø ø 3. ÿрþÑÂтрðýÑÂтòõýýðѠÑÂÿõцøðûø÷ðцøѠòýутрø ÑÂúÑÂúрõüõýтþò üþóут рðÑÂÑÂüðтрøòðтьÑÂѠúðú ðôðÿтðцøø, þñûõóчðющøõ òýутрøòøôþòыõ úþýтðúты ò ÿþÿуÃȄÂцøÑÂÑ…, úþтþрыõ чðÑÂтþ рð÷рõöõýы ò þтýþшõýøø òþ÷üþöýþÑÂтõù ÑÂÿðрøòðýøÑÂ. |
URL: | http://www.jstor.org/stable/3544488 |