Jump to Main Content
PubAg
Main content area
Search
« Previous |
1 - 20 of 350
|
Next »
Search Results
- Author:
- Scott, James A.
- Source:
- Ecology 1975 v.56 no.6 pp. 1367-1377
- ISSN:
- 0012-9658
- Subject:
- migratory species, etc ; Lepidoptera; adults; extinction; flight; food plants; habitats; larvae; males; oviposition; population size; rearing; shrubs; trees; Show all 14 Subjects
- Abstract:
- ... Flights (movements from place to place) were studied in 11 species of Lepidoptera which differed in size, mate—locating behavior, food plants of larvae and adults, oviposition behavior, population size, areal extent of populations, and habitat features possibly limiting flights. and population size were quantified. Mate—locating behavior influences the difference in flights of ♂ ♂ and ♀ ♀; males t ...
- DOI:
- 10.2307/1934703
-
http://dx.doi.org/10.2307/1934703
- Author:
- Wiens, John A.; Rotenberry, John T.
- Source:
- Ecological monographs 1980 v.50 no.3 pp. 287-308
- ISSN:
- 0012-9615
- Subject:
- migratory species, etc ; Geographical Locations; birds; body length; carnivores; diet; ecological differentiation; frequency distribution; grasslands; monogamy; prediction; principal component analysis; semiarid zones; sexual dimorphism; sexual selection; territoriality; Show all 16 Subjects
- Abstract:
- ... We analyze patterns of morphological variation in a guild of 12 species of grassland/shrubsteppe birds in relation to various theories expressing ecomorphological correlations. Variability in morphology over the six geographic locations sampled was moderate for most species, but several morphological traits exhibited significant variation between years at given locations. Sexual variation (dimorph ...
- DOI:
- 10.2307/2937253
-
http://dx.doi.org/10.2307/2937253
- Author:
- Iwanaga, Kyoko; Nakasuji, Fusao; Toja, Sumio
- Source:
- Entomologia experimentalis et applicata 1987 v.43 no.1 pp. 3-10
- ISSN:
- 0013-8703
- Subject:
- migratory species, etc ; Nilaparvata lugens; coasts; females; immigration; laboratory experimentation; nymphs; population density; China; Indonesia; Japan; Malaysia; Philippines; South Asia; Taiwan; Show all 15 Subjects
- Abstract:
- ... Great variations in nymphal density and wing-form relationships occur in field populations of the brown planthopper, Nilaparvata lugens (Stål) (Homoptera: Delphacidae). When tested under uniform laboratory conditions, half of the female populations collected from 20 locations in Japan exhibited higher ratios of macropters with increasing nymphal density, but one quarter were macropterous over broa ...
- DOI:
- 10.1111/j.1570-7458.1987.tb02194.x
-
http://dx.doi.org/10.1111/j.1570-7458.1987.tb02194.x
- Author:
- Iwanaga, Kyoko; Nakasuji, Fusao; Toja, Sumio
- Source:
- Entomologia experimentalis et applicata 1987 v.43 no.2 pp. 3-10
- ISSN:
- 0013-8703
- Subject:
- migratory species, etc ; Nilaparvata lugens; coasts; females; immigration; laboratory experimentation; China; Indonesia; Japan; Malaysia; Philippines; South Asia; Taiwan; Show all 13 Subjects
- Abstract:
- ... Great variations in nymphal density and wing-form relationships occur in field populations of the brown planthopper, Nilaparvata lugens (Stål) (Homoptera: Delphacidae). When tested under uniform laboratory conditions, half of the female populations collected from 20 locations in Japan exhibited higher ratios of macropters with increasing nymphal density, but one quarter were macropterous over broa ...
- DOI:
- 10.1111/j.1570-7458.1987.tb01038.x
-
http://dx.doi.org/10.1111/j.1570-7458.1987.tb01038.x
- Author:
- Dingle, Hugh; Evans, Kenneth E.
- Source:
- Entomologia experimentalis et applicata 1987 v.45 no.3 pp. 289-296
- ISSN:
- 0013-8703
- Subject:
- migratory species, etc ; Oncopeltus fasciatus; fecundity; genetic correlation; insect flight; migratory behavior; wings; Iowa; Puerto Rico; Show all 9 Subjects
- Abstract:
- ... A sample of nonmigratory Oncopeltus fasciatus (Dallas) (Hemiptera: Lygaeidae) from Puerto Rico was subjected to bi-directional selection for wing length for 20 generations. Response to selection was strong in both directions. In the 8th and 14th generations samples were drawn from the selected lines and tested for tethered flight. There was little flight observed and no correlation between wing le ...
- DOI:
- 10.1111/j.1570-7458.1987.tb01097.x
-
http://dx.doi.org/10.1111/j.1570-7458.1987.tb01097.x
- Author:
- Denno, Robert F.; Roderick, George K.
- Source:
- Ecology 1992 v.73 no.4 pp. 1323-1334
- ISSN:
- 0012-9658
- Subject:
- migratory species, etc ; Fulgoroidea; body size; females; habitats; insects; interspecific competition; migratory behavior; morphs; population growth; survival rate; sympatry; wings; Show all 13 Subjects
- Abstract:
- ... In dense populations, most planthoppers (Homoptera:Delphacidae) produce fully winged migratory forms that can escape to new habitats. Under less crowded conditions, flightless morphs with reduced wings result. For two sympatric species, Prokelisia marginata and Prokelisia dolus, interspecific crowding was found to be as strong a stimulus for the production of migrants as intraspecific crowding. Th ...
- DOI:
- 10.2307/1940679
-
http://dx.doi.org/10.2307/1940679
- Author:
- Dadswell, M. J.; Rulifson, R. A.
- Source:
- Biological journal of the Linnean Society 1994 v.51 no.1/2 pp. 93-113
- ISSN:
- 0024-4066
- Subject:
- migratory species, etc ; Alosa sapidissima; Morone saxatilis; Salmo salar; coasts; estuaries; herring; life history; mortality; seals; shad; sharks; squid; sturgeon; surveys; turbines; water currents; water power; whales; Alaska; Florida; United Kingdom; Show all 22 Subjects
- Abstract:
- ... Macrotidal estuaries of the inner Bay of Fundy are utilized by large numbers of migratory fishes, particularly dogfish, sturgeon, herring, shad, Atlantic salmon and striped bass as well as by other migratory marine animals, many of which have large body sizes (squid, Lamnid sharks, seals and whales). Tagging experiments indicate the fishes originate from stocks derived over the entire North Americ ...
- DOI:
- 10.1111/j.1095-8312.1994.tb00947.x
-
http://dx.doi.org/10.1111/j.1095-8312.1994.tb00947.x
- Author:
- Cowx, I. G.; O'Grady, K. T.; HAIMOVICI, M.
- Source:
- Fisheries management and ecology 1998 v.5 no.4 pp. 277-289
- ISSN:
- 0969-997X
- Subject:
- migratory species, etc ; Cynoscion guatucupa; Macrodon ancylodon; Micropogonias furnieri; Pagrus pagrus; Paralichthys patagonicus; Pogonias cromis; Rhinobatos; Umbrina; crabs; demersal fish; fisheries; gillnets; life history; population dynamics; shrimp; traps; trawl nets; winter; Argentina; Brazil; Uruguay; Show all 22 Subjects
- Abstract:
- ... The demersal fish stocks in southern Brazil were assessed from landings and catchper‐unit effort data trends between 1975 and 1994, available information on the life history patterns, and population dynamics of the most important species. The fishing gears, mostly otter and pair bottom trawls in the 1970s, diversified towards double‐rig trawls for fish and shrimp and bottom gill nets in the mid 19 ...
- DOI:
- 10.1046/j.1365-2400.1998.540277.x
-
http://dx.doi.org/10.1046/j.1365-2400.1998.540277.x
- Author:
- Svensson, Erik; Hedenström, Anders
- Source:
- Biological journal of the Linnean Society 1999 v.67 no.2 pp. 263-276
- ISSN:
- 0024-4066
- Subject:
- migratory species, etc ; Sylviidae; adults; birds; breeding; breeding sites; feathers; migratory behavior; molting; phylogeny; summer; winter; Show all 12 Subjects
- Abstract:
- ... Adult birds replace their flight feathers (moult) at least once per year, either in summer after termination of breeding or (in the case of some long-distance migratory species) in the winter quarters. We reconstructed the evolutionary pathways leading to summer and winter moult using recently published molecular phylogenetic information on the relationships of the Western Palearctic warblers (Ave ...
- DOI:
- 10.1111/j.1095-8312.1999.tb01864.x
-
http://dx.doi.org/10.1111/j.1095-8312.1999.tb01864.x
- Author:
- Eby, Peggy; Richards, Greg; Collins, Linda; Parry-Jones, Kerryn
- Source:
- The Australian zoologist 1999 v.31 no.1 pp. 240-253
- ISSN:
- 0067-2238
- Subject:
- migratory species, etc ; Pteropus alecto; Pteropus poliocephalus; animals; at-risk population; coasts; conservation status; flowering; habitats; human population; nectar; nectar feeding; population dynamics; vegetation; New South Wales; Show all 15 Subjects
- Abstract:
- ... The Grey-headed Flying-fox Pteropus poliocephalus has an expansive range. However, the species actually occupies a relatively restricted and continuously changing habitat area, which is primarily defined by irregular patterns of nectar availability. A synchronous count of Greyheaded Flying-foxes in New South Wales taken in July 1988 described the distribution and abundance of the species du ...
- DOI:
- 10.7882/AZ.1999.024
-
http://dx.doi.org/10.7882%2FAZ.1999.024
- Author:
- Pringle, Catherine M.
- Source:
- Ecological applications 2001 v.11 no.4 pp. 981-998
- ISSN:
- 1051-0761
- Subject:
- migratory species, etc ; aquifers; atmospheric deposition; climate change; energy; groundwater extraction; habitats; humans; hydrologic cycle; introduced species; landscapes; pollution; terrestrial ecosystems; toxicity; watersheds; wildlife; wind; Show all 17 Subjects
- Abstract:
- ... Increasingly, biological reserves throughout the world are threatened by cumulative alterations in hydrologic connectivity within the greater landscape. Hydrologic connectivity is used here in an ecological sense to refer to water‐mediated transfer of matter, energy, and/or organisms within or between elements of the hydrologic cycle. Obvious human influences that alter this property include dams, ...
-
- Author:
- Koenig, Walter D.
- Source:
- Ecology 2001 v.82 no.9 pp. 2636-2644
- ISSN:
- 0012-9658
- Subject:
- migratory species, etc ; autocorrelation; birds; environmental factors; extinction; food chain; interspecific variation; monitoring; population dynamics; population size; winter; Show all 11 Subjects
- Abstract:
- ... I examined the degree to which population sizes of North American wintering birds exhibit spatial synchrony (autocorrelation) and local disappearances based on 30 yr of Christmas Bird Counts. The primary goal of these analyses was to determine whether processes expected in metapopulations, including low spatial synchrony, frequent local disappearances, and colonization leading to population rescue ...
- DOI:
- 10.1890/0012-9658(2001)082[2636:SAALDI]2.0.CO;2
-
http://dx.doi.org/10.1890/0012-9658(2001)082%5B2636:SAALDI%5D2.0.CO;2
- Author:
- Fleming, Theodore H.; Sahley, Catherine T.; Holland, J. Nathaniel; Nason, John D.; Hamrick, J. L.
- Source:
- Ecological monographs 2001 v.71 no.4 pp. 511-530
- ISSN:
- 0012-9615
- Subject:
- migratory species, etc ; Carnegiea gigantea; Chiroptera; Pachycereus pringlei; Pachycereus schottii; Stenocereus thurberi; additive effect; cacti and succulents; evolution; females; flowering; flowers; fruit set; fruits; geographical variation; habitats; honey bees; hummingbirds; migratory behavior; moths; mutualism; nectar; phenology; pollen; pollination; pollinators; rain; seed set; seeds; spatial variation; spring; temperature; temporal variation; Arizona; Mexico; Sonoran Desert; Show all 36 Subjects
- Abstract:
- ... We studied variation in flowering phenology, fruit and seed set, and the abundance of the pollinators of four species of night‐blooming Sonoran Desert columnar cacti for up to eight years at one site in Mexico and one year at one site in Arizona. We determined how spatiotemporal variation in plant–pollinator interactions affects the evolution of generalized pollination systems. We conducted pollin ...
- DOI:
- 10.1890/0012-9615(2001)071[0511:SDCCAT]2.0.CO;2
-
http://dx.doi.org/10.1890/0012-9615(2001)071%5B0511:SDCCAT%5D2.0.CO;2
- Author:
- Hendricks, Paul; Johnson, Joseph; Lenard, Susan; Currier, Coburn
- Source:
- Canadian field-naturalist 2005 v.119 no.1 pp. 132-133
- ISSN:
- 0008-3550
- Subject:
- migratory species, etc ; Lasiurus cinereus; culverts; females; habitats; leaves; roosting behavior; surveys; trees; Montana; Show all 10 Subjects
- Abstract:
- ... The Hoary Bat (Lasiurus cinereus) is a migratory species with the widest distribution of all New World bats. It is a solitary species that roosts during the day and night primarily among tree foliage. During a survey of 130 highway structures (bridges and culverts) in south central Montana for evidence of use by bats, we discovered a female Hoary Bat with young in mid July 2003 using a wooden b ...
- DOI:
- 10.22621/cfn.v119i1.92
-
http://dx.doi.org/10.22621/cfn.v119i1.92
- Author:
- Latch, E.K.; Rhodes, O.E. Jr..
- Source:
- Animal conservation 2006 v.9 no.3 pp. 308-315
- ISSN:
- 1367-9430
- Subject:
- migratory species, etc ; adults; allozymes; flocks; genetic techniques and protocols; geographical distribution; microsatellite repeats; social structure; spring; turkeys; Show all 10 Subjects
- Abstract:
- ... Traditional population genetic analyses typically seek to characterize the genetic substructure caused by the nonrandom distribution of individuals. However, the genetic structuring of adult populations often does not remain constant over time, and may vary relative to season or life-history stages. Estimates of genetic structure may be biased if samples are collected at a single point in time, an ...
- DOI:
- 10.1111/j.1469-1795.2006.00037.x
-
http://dx.doi.org/10.1111/j.1469-1795.2006.00037.x
- Author:
- Husté, Aurélie; Boulinier, Thierry
- Source:
- Ecological applications 2007 v.17 no.1 pp. 168-180
- ISSN:
- 1051-0761
- Subject:
- migratory species, etc ; animal communities; biodiversity conservation; birds; breeding; data collection; extinction; habitat fragmentation; habitats; humans; landscapes; migratory behavior; probability; sedentary species; species diversity; suburban areas; temporal variation; urban areas; urbanization; wildlife; France; Show all 21 Subjects
- Abstract:
- ... Studying the effects of urbanization on the dynamics of communities has become a priority for biodiversity conservation. The consequences of urbanization are mainly an increased fragmentation of the original landscapes associated with a decrease in the amount of favorable habitats and an increased pressure of human activities on the remaining patches suitable for wildlife. Patterns of bird species ...
-
- Author:
- Rehm, Evan M.; Baldassarre, Guy A.
- Source:
- Journal of field ornithology 2007 v.78 no.1 pp. 56-63
- ISSN:
- 0273-8570
- Subject:
- migratory species, etc ; Botaurus lentiginosus; Ixobrychus exilis; Podiceps; Podilymbus; Rallus limicola; geographical variation; marshes; monitoring; population dynamics; surveys; temporal variation; water birds; New York; Virginia; Show all 15 Subjects
- Abstract:
- ... The decline in populations of several species of marsh birds in North America has prompted development of a monitoring protocol that involves the broadcast of conspecific calls to enhance detection of these secretive species. However, with a standardized protocol, temporal (seasonal) and geographic variation in responses to the broadcast of calls could lead to inadequate monitoring of migratory sp ...
- DOI:
- 10.1111/j.1557-9263.2006.00085.x
-
http://dx.doi.org/10.1111/j.1557-9263.2006.00085.x
- Author:
- Smith, Katherine L.; Jones, Michael L.
- Source:
- Environmental monitoring and assessment 2007 v.135 no.1-3 pp. 291-311
- ISSN:
- 0167-6369
- Subject:
- migratory species, etc ; data collection; fish; game animals; habitats; hydrology; introduced species; managers; species diversity; surveys; watersheds; Great Lakes; Show all 12 Subjects
- Abstract:
- ... Addressing landscape-level threats to stream fishes such as habitat and hydrological alterations requires adequate watershed-level species inventories. Where watershed-level ichthyofaunal surveys are prohibitively expensive, existing (historical) data sources may provide an option for compiling species lists. However, it is critical that managers consider potential biases or limitations of species ...
- DOI:
- 10.1007/s10661-007-9650-1
-
http://dx.doi.org/10.1007/s10661-007-9650-1
- Author:
- Dudley, R.; Srygley, R.B.
- Source:
- Functional ecology 2008 v.22 no.2 pp. 264-270
- ISSN:
- 0269-8463
- Subject:
- migratory species, etc ; Nymphalidae; Pieridae; butterflies; chloroform; energy; flight; gender; lipid content; lipids; methanol; prediction; tropics; wet season; wind; Panama; Show all 16 Subjects
- Abstract:
- ... 1. Aerodynamic theory predicts that migrant fliers should reduce their speed of flight as endogenous energy reserves are gradually consumed. This prediction was tested for butterfly species (Pieridae and Nymphalidae) that engage in annual rainy season migrations through central Panama. 2. Direct airspeed measurements were made on butterflies in natural free flight, followed by chloroform : methano ...
- DOI:
- 10.1111/j.1365-2435.2007.01364.x
-
http://dx.doi.org/10.1111/j.1365-2435.2007.01364.x
- Author:
- D'Adamo, R.; Di Stasio, M.; Fabbrocini, A.; Petitto, F.; Roselli, L.; Volpe, M. G.
- Source:
- Environmental monitoring and assessment 2008 v.143 no.1-3 pp. 15-24
- ISSN:
- 0167-6369
- Subject:
- migratory species, etc ; Crustacea; cadmium; case studies; chromium; coasts; copper; environmental quality; exoskeleton; heavy metals; juveniles; lead; manganese; muscles; pollution; sediments; shrimp; zinc; Italy; Show all 19 Subjects
- Abstract:
- ... The Lesina lagoon is located on the southern Adriatic coast of Italy; many marine species, such as the shrimp M. kerathurus, use the Lesina lagoon as a nursery, spending their initial growth phase there. In order to assess the usefulness of migratory species as biomonitors of the environmental quality of this nursery area, we evaluated the metal content of the M. kerathurus juveniles at the end of ...
- DOI:
- 10.1007/s10661-007-9944-3
-
http://dx.doi.org/10.1007/s10661-007-9944-3