Population Ecology

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Are there genetically controlled habitat-specific differences in spatial aggregation of drosophilids?
Population Ecology - Tập 46 - Trang 269-274 - 2004
Marko Rohlfs, Thomas S. Hoffmeister
Variation in spatial patterns of competing organisms is of fundamental importance for community and population processes. Yet the mechanisms controlling subjects like the degree of spatial aggregation in competing insect larvae across fragmented resources have rarely been addressed. In the present study, we tested for systematic differences in the spatial distribution patterns of Drosophila subobs...... hiện toàn bộ
Dispersal and habitat cuing of Eurasian red squirrels in fragmented habitats
Population Ecology - Tập 52 - Trang 527-536 - 2010
Lucas Armand Wauters, Goedele Verbeylen, Damiano Preatoni, Adriano Martinoli, Erik Matthysen
Animal dispersal and subsequent settlement is a key process in the life history of many organisms, when individuals use demographic and environmental cues to target post-dispersal habitats where fitness will be highest. To investigate the hypothesis that environmental disturbance (habitat fragmentation) may alter these cues, we compared dispersal patterns of 60 red squirrels (Sciurus vulgaris) in ...... hiện toàn bộ
Toads in the backyard: why do invasive cane toads (Rhinella marina) prefer buildings to bushland?
Population Ecology - Tập 58 - Trang 293-302 - 2016
Edna González-Bernal, Matthew J. Greenlees, Gregory P. Brown, Richard Shine
Like many invasive species, cane toads (Rhinella marina) in Australia concentrate in the disturbed habitats created by human activity, rather than in pristine areas. We surveyed cane toads in the wet–dry tropics of the Northern Territory to assess the abundances, body sizes, sexes, behaviour, hydration state and feeding rates of toads around buildings compared to those in areas remote from buildin...... hiện toàn bộ
Conspecific host discrimination by ovipositing Euphydryas editha butterflies: Its nature and its consequences for offspring survivorship
Population Ecology - Tập 27 Số 1 - Trang 87-98 - 1985
Duncan A. Mackay
SummaryOvipositing E. editha butterflies display post‐alighting discrimination among patches of Collinsia torreyi, one of their major hosts in the General's Highway (GH) population at a montane site in California. Females tended to accept (i.e. oviposit on) dense patches of this host and to reject sparse patches...... hiện toàn bộ
Density dependence in northern ungulates: interactions with predation and resources
Population Ecology - Tập 51 - Trang 123-132 - 2008
Guiming Wang, N. Thompson Hobbs, Saran Twombly, Randall B. Boone, Andrew W. Illius, Iain J. Gordon, John E. Gross
Variation in the abundance of animals has traditionally been explained as the outcome of endogenous forcing from density dependence and exogenous forcing arising from variation in weather and predation. Emerging evidence suggests that the effects of density dependence interact with external influences on population dynamics. In particular, spatial heterogeneity in resources and the presence of cap...... hiện toàn bộ
Herbivory damage does not indirectly influence the composition or excretion of aphid honeydew
Population Ecology - Tập 48 - Trang 245-250 - 2006
David H. Hembry, Noboru Katayama, Masaru K. Hojo, Takayuki Ohgushi
Recent research has shown that extrafloral nectar secretion by plants, which also attracts ants, is a defense inducible by herbivory damage. Our research addresses the question of whether plants can manipulate the honeydew secretions of homopterans as an inducible defense in response to herbivory in the same manner as extrafloral nectaries. We investigated changes in honeydew composition and excre...... hiện toàn bộ
Comparative demographic analysis in contrasting environments of Magnolia dealbata: an endangered species from Mexico
Population Ecology - Tập 52 Số 1 - Trang 203-210 - 2010
Lázaro Rafael Sánchez-Velásquez, María del Rosario Pineda-López
AbstractThe study of population regulation and demography in natural habitats is critical for the conservation of rare and endangered species. We address the impact of cattle exclusion on the demographics of Magnolia dealbata (Magnoliaceae), an endangered species according to IUCN and Federal Mexican laws. Sixteen permanent plots were est...... hiện toàn bộ
The ingestion in wolf spiders II. The expression of degree of hunger and amount of ingestion in relation to spider's hunger
Population Ecology - - 1972
Kazuo Nakamura
SummaryTo express the degree of hunger during both of feeding and unfeeding periods of spiders, equations for the amount of ingestion and food disappearance from the gut were presented using three components: capacity of gut, rate of ingestion and rate of food disappearance. The degree of hunger was expressed by the rate of unfilled capacity of gut to the capacity ...... hiện toàn bộ
Population fluctuation in the system of host-parasite interaction
Population Ecology - Tập 2 - Trang 22-46 - 1953
Syunro Utida
The relative importance of sexual and clonal reproduction for population growth in the perennial herb Fragaria vesca
Population Ecology - Tập 54 - Trang 369-380 - 2012
Juerg Schulze, Rita Rufener, Andreas Erhardt, Peter Stoll
The relative importance of sexual and clonal reproduction for population growth in clonal plants is highly variable. Clonal reproduction is often more important than sexual reproduction but there is considerable interspecific variation and the importance of the two reproductive modes can change with environmental conditions. We carried out a demographic study on the woodland strawberry (Fragaria v...... hiện toàn bộ
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