scholarly journals Life history of Capnia bifrons (Newman, 1838) (Plecoptera: Capniidae) in a small Apennine creek, NW Italy

2013 ◽  
Vol 24 (1) ◽  
pp. 29-34 ◽  
Author(s):  
Bo Tiziano ◽  
Manuel Jesús López-Rodríguez ◽  
Alessandro Mogni ◽  
Josè Manuel Tierno de Figueroa ◽  
Stefano Fenoglio
Keyword(s):  
Organic Matter ◽  
Life History ◽  
Secondary Production ◽  
Flight Period ◽  
Ontogenetic Shift ◽  
Coarse Particulate Organic Matter ◽  
Food Items ◽  
Mountain System ◽  
History Of ◽  
Nw Italy

The biology of stoneflies from Apennine mountain system is little known. In the present study, we provide information on the life cycle, secondary production, nymphal feeding and flight period of <i>Capnia bifrons</i> (Newman, 1838) in the Albedosa creek (NW Italy). At this study site, the species has a univoltine life cy- cle, with a relatively short and fast nymphal development period and high annual secondary production. Nymphs feed mainly on detritus but incorporate also other food items in their diet, such as coarse particulate organic matter and fungi. Ontogenetic shift from collector-gatherer to shredder habits is detected. Emer- gence is in February–April, slightly late compared to northern populations.

scholarly journals Life History of Lepidostoma hirtum in an Iberian Stream and its Role in Organic Matter Processing

Hydrobiologia ◽  
2006 ◽  
Vol 559 (1) ◽  
pp. 183-192 ◽  
Author(s):  
H. V. S. Azevedo-Pereira ◽  
M. A. S. Graça ◽  
J. M. González
Keyword(s):  
Organic Matter ◽  
Life History ◽  
History Of ◽  
Organic Matter Processing

Hyporheic secondary production and life history of a common Ozark stonefly

Hydrobiologia ◽  
2019 ◽  
Vol 847 (2) ◽  
pp. 443-456 ◽  
Author(s):  
Nathan C. Dorff ◽  
Debra S. Finn
Keyword(s):  
Life History ◽  
Secondary Production ◽  
History Of

XV.—An Investigation into the Structure and Life-History of the Sulphur Bacteria (I)

1925 ◽  
Vol 44 ◽  
pp. 153-167
Author(s):  
David Ellis
Keyword(s):  
Organic Matter ◽  
Life History ◽  
Protein Molecule ◽  
Shallow Waters ◽  
Naked Eye ◽  
Full Development ◽  
Sulphur Bacteria ◽  
History Of ◽  
Abundant Supply ◽  
Sulphuretted Hydrogen

The sulphur bacteria are found in shallow waters, both marine and fresh, and play an active part in the decomposition of animal and vegetable matter. They require for their full development an abundant supply of oxygen and of sulphuretted hydrogen. They do not thrive unless the water is periodically renewed, or else is so shallow that oxygen is obtainable to a fairly large extent from the atmosphere. When the oxygen is used up their development rapidly comes to an end, and in some cases, as is described below, the organisms disappear completely. They derive their supply of sulphuretted hydrogen from the decomposition of the protein molecule of vegetable and animal matter. Usually a growth of sulphur bacteria is visible to the naked eye as a greyish or reddish mantle covering the surface of a mass of decomposing organic matter. If, for some reason or other, the supply of oxygen is not plentiful at the bottom of the pool, the mass of growth leaves the surface of the decomposing matter and moves nearer the surface of the water.

The life history of a tropical dragonfly: Cora marina (Odonata: Polythoridae) in Guanacaste, Costa Rica

1996 ◽  
Vol 12 (4) ◽  
pp. 573-581 ◽  
Author(s):  
Gordon Pritchard
Keyword(s):  
Life History ◽  
Costa Rica ◽  
Hyporheic Zone ◽  
Flight Period ◽  
Low Oxygen ◽  
Wet Season ◽  
Oxygen Conditions ◽  
History Of ◽  
One Year ◽  
Oviposition Sites

ABSTRACTThe life history of Cora marina was followed for one year in two permanent streams at 600 m elevation in Guanacaste National Park; Costa Rica. The water temperature was c. 21°C year-round, but there was a distinct wet-dry seasonality, very little rain falling from January to May. In both streams, C. marina was univoltine. Adults first appeared at the beginning of May and the flight period coincided with the wet season. The availability of water-soaked logs as oviposition sites probably restricts reproduction to the wet season. Eggs hatched from mid-July to December. Recruitment to subsequent larval instars was slow during the wet season but increased at the start of the dry season. Final-instar larvae were collected from March to October. Oviposition in logs above the stream and the ability to live in the low oxygen conditions of the hyporheic zone probably allow eggs and small larvae to survive wet season spates.El ciclo biológico de una libelula tropical: Cora marina (Odonata: Polythoridae) en Guanacaste, Costa Rica.

The life history of Branchinecta mackini Dexter (Crustacea: Anostraca) in an argillotrophic lake of Alberta

1977 ◽  
Vol 55 (1) ◽  
pp. 161-168 ◽  
Author(s):  
Graham R. Daborn
Keyword(s):  
Organic Matter ◽  
Life History ◽  
Life Cycle ◽  
Growth Rates ◽  
Dry Weight ◽  
Fairy Shrimp ◽  
Maximum Biomass ◽  
History Of ◽  
Mean Size

The life history of B. mackini was studied in a large argillotrophic lake during 1970–1972. Hatching began immediately after spring thaw and was terminated by rising salinity 10 days to 2 weeks later. Growth rates reached maxima of 1 mm/day at 4 weeks of age and then declined as mean size approached 22–23 mm at 7–8 weeks. Clutch sizes varied as a function of female length. Maximum biomass of 580 mg dry weight/m2 (2700 cal/m2) was reached in late May, of which 3.9% per day was consumed by B. gigas. Source of the energy is presumed to be a bacteria – organic matter complex associated with suspended particles. Life cycle details are compared with other fairy shrimp species and the role of B. mackini in the community is discussed.

scholarly journals Nymphal biology of Brachyptera risi (Morton, 1896) (Plecoptera: Taeniopterygidae) in a North Apennine stream (Italy)

2008 ◽  
Vol 19 (4) ◽  
pp. 228-231 ◽  
Author(s):  
Stefano Fenoglio ◽  
Tiziano Bo ◽  
Jesus López-Rodríguez ◽  
José Tierno de Figueroa
Keyword(s):  
Organic Matter ◽  
Life History ◽  
Life Cycle ◽  
Principal Component ◽  
Gut Contents ◽  
Trophic Plasticity ◽  
Egg Diapause ◽  
Fine Particulate ◽  
History Of ◽  
European Populations

Some aspects of the life history of a population of Brachyptera risi were investigated in a North Apennine stream and compared with previously studied European populations. In our study area, this species showed a univoltine fast seasonal life cycle. Nymphs were present from January to the beginning of May, probably spending the rest of the year mainly in egg diapause. Fine particulate organic matter was the principal component of the diet, while diatoms and other algae were also found in the guts. This finding suggests the existence of greater trophic plasticity of the species. Individuals of this population act as gatherer-collectors but not as scrapers as usually pointed out for other European populations. We also detected considerable amounts of animal matter in the gut contents. The density of B. risi nymphs in the study area was very variable during the study period, ranging from 0 to 2,348 ind/m2.

The life history of Philocasca alba (Trichoptera: Limnephilidae) in a Rocky Mountain stream

1984 ◽  
Vol 62 (7) ◽  
pp. 1282-1288 ◽  
Author(s):  
R. A. Mutch ◽  
G. Pritchard
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Rocky Mountains ◽  
Laboratory Experiments ◽  
Larval Instar ◽  
Rocky Mountain ◽  
Mountain Stream ◽  
Flight Period ◽  
Conifer Needles ◽  
History Of

The life cycle of Philocasca alba Nimmo spans 3 years in a cold, second order, subalpine stream in the Rocky Mountains of Alberta. The flight period was from mid-May to late July. Larval instar 1 was found only in August–September; all other four instars were present in samples throughout most of the year. In their third autumn in the stream larvae in the final instar burrowed into gravel, pupated, and overwintered. Growth was confined to the ice-free period, June to November, when larval densities were greatest among deposits of conifer needles, cones, and woody material in pools. Larvae from these detrital accumulations had mainly fragments of conifer needles in their guts, although laboratory experiments showed that larvae could feed and grow on conifer needles only if they were highly conditioned. The later instars, particularly instar V, constituted a much greater than expected proportion of total larvae among submerged bank vegetation in spring and summer and deciduous leaves in autumn. Larvae in these two microhabitats mainly had fragments of moss and fragments of leaves, respectively, in their guts. The importance of moss was confirmed by a field experiment which showed that fifth instar larvae had significantly faster growth rates when fed on detritus supplemented with bank moss than detritus alone or detritus supplemented with deciduous leaves during the autumn.

Quelques aspects de la biologie du grand corégone Coregonus clupeaformis des lacs Hélène et Nathalie, territoire de la Baie James

1978 ◽  
Vol 56 (6) ◽  
pp. 1402-1411 ◽  
Author(s):  
Pierre Dumont ◽  
Réjean Fortin
Keyword(s):  
Life History ◽  
Population Density ◽  
Water Temperature ◽  
Growth Rates ◽  
Aquatic Insects ◽  
Coregonus Clupeaformis ◽  
Main Food ◽  
Food Items ◽  
Relative Fecundity ◽  
History Of

The life history of lake whitefish in lakes Nathalie (53°27′ N; 77°27′ W) and Hélène (53°27′ N; 77°31′W) was studied between June 1974 and November 1975. The age of 840 specimens was determined from the scales. Growth rates are very slow, compared only with those of dwarf whitefish of certain North American lakes. Food varies with the length of the fish and with the season of the year. Main food items are aquatic insects (larvae and adults), mollusks, and small fishes. In 1975, spawning occurred in late October (water temperature: 4 °C), at depths of 2–4 m; substrates utilized were sand, gravel, and boulders. Spawning lasted less than 2 weeks. Males mature at 390 mm (age 8) and females at 400 mm (age 9). Lake Nathalie whitefish (N = 41) show a low relative fecundity (17 980 eggs/kg). In the fall of 1974, the population density of Lake Nathalie whitefish 350 mm and longer was estimated at 839 individuals (0.72 kg/ha).

scholarly journals Stable isotope analysis of vertebrae reveals ontogenetic changes in habitat in an endothermic pelagic shark

2015 ◽  
Vol 282 (1799) ◽  
pp. 20141446 ◽  
Author(s):  
Aaron B. Carlisle ◽  
Kenneth J. Goldman ◽  
Steven Y. Litvin ◽  
Daniel J. Madigan ◽  
Jennifer S. Bigman ◽  
...  
Keyword(s):  
Life History ◽  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Prey Availability ◽  
Isotope Analysis ◽  
Isotopic Niche ◽  
Mixing Models ◽  
Ontogenetic Shift ◽  
Ontogenetic Changes ◽  
History Of

Ontogenetic changes in habitat are driven by shifting life-history requirements and play an important role in population dynamics. However, large portions of the life history of many pelagic species are still poorly understood or unknown. We used a novel combination of stable isotope analysis of vertebral annuli, Bayesian mixing models, isoscapes and electronic tag data to reconstruct ontogenetic patterns of habitat and resource use in a pelagic apex predator, the salmon shark ( Lamna ditropis ). Results identified the North Pacific Transition Zone as the major nursery area for salmon sharks and revealed an ontogenetic shift around the age of maturity from oceanic to increased use of neritic habitats. The nursery habitat may reflect trade-offs between prey availability, predation pressure and thermal constraints on juvenile endothermic sharks. The ontogenetic shift in habitat coincided with a reduction of isotopic niche, possibly reflecting specialization upon particular prey or habitats. Using tagging data to inform Bayesian isotopic mixing models revealed that adult sharks primarily use neritic habitats of Alaska yet receive a trophic subsidy from oceanic habitats. Integrating the multiple methods used here provides a powerful approach to retrospectively study the ecology and life history of migratory species throughout their ontogeny.

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