Search results for "Fauna"
showing 10 items of 513 documents
δ18O values of coexisting brachiopods and fish: Temperature differences and estimates of paleo–water depths
1998
To estimate vertical thermal gradients and paleo–water depths to marine platforms we present a new method based on the difference between δ 18 O values of contemporaneous brachiopod carbonate and fish phosphate. Present-day marine fauna of well-known ecology from the surface to the sea floor record isotopic temperatures that agree with measured temperatures. We predict distributions of isotopic data that result from sampling strategy, basin morphology, and fauna ecology and discuss limitations. Application of the method to the Jurassic Paris-London basin gives vertical thermal variations of up to 14 °C associated with depths varying from a few meters to 170 ± 30 m. The estimated depths are …
Crustacea Decapoda from Ustica (Southern Tyrrhenian Sea): species distribution and sampling approach.
2011
The decapod crustacean fauna of Ustica Island (Sicily, southern Tyrrhenian Sea) has been investigated in summer 2002 with the aid of many different sampling methods: suction device, pushnet, skid trawl, trammel net, traps, underwater observation, interviews. All the substrata occurring around the island from 0 to about -30 m were surveyed: midlittoral rock, infralittoral rock, pebbles, seagrass (Posidonia oceanica) bed, sand, detritic bottom, submerged cave. Fiftyseven species were collected in the investigated localities. Abundance and frequency of all species in the samples and in each surveyed biotope are given. The performance of each sampling method has been evaluated, in terms of numb…
Population dynamics using temporal series analysis in a industrial two-stage activated sludge pilot plant
1998
A time series analysis using an autocorrelation function (ACF) was used to assess the relative importance of density (DD) and non density-dependent - (NDD) factors on microfauna abundance of a two-stage activated sludge pilot plant treating industrial effluents. Although some previous work has detected a carrying capacity for the total microfauna abundance in both reactors, ACF showed a general pattern of non-density dependent abundance regulation. Stationarity due to density-dependent factors was observed for the two major species in the first reactor, the sessile Opercularia asymmetrica and the crawling Chilodonatella minuta. There was no evidence of bacterial competition and only weak ev…
Speciation of sponges in Baikal-Tuva region: an outline
2006
Lake Baikal is known for its high percentage of endemic fauna and flora. The most abundant sessile animal taxa in the littoral zone of Baikal are the photosymbiotic sponges. These endemic sponges are grouped to the family Lubomirskiidae and are separated, based on molecular data, from the cosmopolitan family Spongillidae Gray 1867. In the present review, recent data on the potential driving forces of the rapid speciation in Lake Baikal have been unified. Current data suggest that the genetic repertoire of the sponges was sufficiently large to cope with the major cold events, occurring 2.8–2.5 and 1.8–1.5 Ma. It is proposed that during those periods of climatic incisions founder populations …
Augsnes makrofaunas daudzveidība vērī un gāršā dabas parkā „Ogres ieleja”
2016
Bakalaura darba pētījums tika veikts dabas parkā „Ogres ieleja”. Darbā tika pētīta augsnes makrofaunas daudzveidība egļu vērī un jauktu koku gāršā. Augsnes makrofaunai ir liela nozīme organisko atlieku sadalīšanā, barības vielu aprites nodrošināšanā un augsnes auglības uzturēšanā. Darbā tika noskaidrots augsnes makrofaunas īpatņu skaits, sugu sastāvs un īpatsvars apsekotajos biotopos. Lai noteiktu dažādu vides faktoru ietekmi uz augsnes faunu tika veikta vairāku augsnes fizikāli - ķīmisko parametru analīze. Bakalaura darba izstrādes laikā darba autore apguva makrofaunas ievākšanas un vairāku taksonomisko grupu noteikšanas metodiku, veģetācijas aprakstīšanas metodiku, augsnes ķīmisko un fizi…
La fauna indoeuropea. Sobre els noms del llop i el camell en ie.
2015
Els noms d’animals salvatges i domèstics ocupen un lloc principal en tots els estudis sobre vocabulari, cultura o economia dels indoeuropeus. La seua reconstrucció serveix com a il·lustració molt aclaridora d’un poble que passa de ser nòmada a sedentari i que, probablement fugint d’una climatologia extrema, protagonitza una gran expansió cap a indrets més temperats i fèrtils on descobreix i estén la ramaderia i l’agricultura. En aquest treball farem un breu repàs a la nòmina tradicionalment acceptada d’animals del món indoeuropeu i en revisarem l’etimologia de dos d’ells: el llop, prototip d’animal ferotge en totes les cultures indoeuropees (lupus est homo hominis), i el camell, oblidat en …
The Role of Aquatic Refuge Habitats for Fish, and Threats in the Context of Climate Change and Human Impact, during Seasonal Hydrological Drought in …
2021
In spite of the obvious climate changes effects on the Carpathian Basin hydrographic nets fish fauna, studies on their potential refuge habitats in drought periods are scarce. Multiannual (2016–2021) research of fish in some streams located in the Saxon Villages area during hydrological drought periods identified, mapped, and revealed the refuge aquatic habitats presence, management needs, and importance for fish diversity and abundance for small rivers. The impact of increasing global temperature and other human activities induced hydrologic net and habitats alteration, decreased the refuge habitats needed by freshwater fish, diminished the fish abundance, and influenced the spatial and te…
Reconstruction of human subsistence and husbandry strategies from the Iberian Early Neolithic: A stable isotope approach
2018
Objectives The Early Neolithic involved an important social and economic shift that can be tested not only with the material culture, but also through biomolecular approaches. The Iberian Peninsula presents few Early Neolithic sites where fauna and humans can be analyzed together from an isotopic perspective. Here we present an isotopic study on the site of Cueva de Chaves as an example for understanding the dietary and economical changes that took place during Early Neolithic in Iberia. Material and methods Here we apply carbon and nitrogen stable isotope analysis to bone collagen from 4 humans and 64 faunal samples from 14 different species. The large dataset belongs to the same unique ch…
The “Alluvial Mesovoid Shallow Substratum”, a New Subterranean Habitat
2013
Received: April 5, 2013; Accepted: August 23, 2013; Published: October 4, 2013
Yet another alien: a second species of Lepisiota spreading across the Canary Islands, Spain (Hymenoptera: Formicidae)
2018
The Canary Islands are a biologically important archipelago hosting many unique species, whose myrmecofauna is peculiarly rich in both endemic and introduced species. Lepisiota frauenfeldi cfr. kantarensis Forel, 1911 is reported for the first time from Fuerteventura and Tenerife. It is the second species of Lepisiota introduced in the archipelago in the last few years, and one of the few documented cases in which Lepisiota frauenfeldi (Mayr, 1855) s.l. acts as a successful tramp species. Comments are also given on taxonomic problems involving the L. frauenfeldi-group and related taxa. Finally, new additional information and comments are presented on the distribution of other alien ants spe…