scholarly journals Seasonal Changes in Blood IgM Levels in Goldfish, with Special Reference to Water Temperature and Gonadal Maturation

1996 ◽  
Vol 62 (5) ◽  
pp. 754-759 ◽  
Author(s):  
Yuzuru Suzuki ◽  
Minoru Orito ◽  
Masayuki Iigo ◽  
Hiroaki Kezuka ◽  
Makito Kobayashi ◽  
...  
Keyword(s):  
Special Reference ◽  
Water Temperature ◽  
Seasonal Changes ◽  
Gonadal Maturation

scholarly journals Computer-Simulated Growth Prediction of Replacement Pullets with Special Reference to Seasonal Changes in Feed Intake

1989 ◽  
Vol 68 (6) ◽  
pp. 771-780 ◽  
Author(s):  
T. MURAMATSU ◽  
S. ISARIYODOM ◽  
I. UMEDA ◽  
J. OKUMURA
Keyword(s):  
Special Reference ◽  
Feed Intake ◽  
Seasonal Changes ◽  
Growth Prediction ◽  
Simulated Growth

Seasonal changes in the diel surfacing behaviour of the bimodally respiring turtle Rheodytes leukops

2003 ◽  
Vol 81 (9) ◽  
pp. 1614-1622 ◽  
Author(s):  
Matthew A Gordos ◽  
Craig E Franklin ◽  
Colin J Limpus
Keyword(s):  
Water Temperature ◽  
Seasonal Changes ◽  
Abiotic Factors ◽  
Diurnal Variations ◽  
Freshwater Turtle ◽  
Behavioural State ◽  
Pressure Sensitive ◽  
Diel Fluctuations ◽  
Increased Activity ◽  
Austral Autumn

The purpose of this study was to determine whether a relationship existed between the diel surfacing trends of the bimodally respiring freshwater turtle Rheodytes leukops and daily fluctuations in specific biotic and abiotic factors. The diel surfacing behaviour of adult R. leukops was recorded over four consecutive seasons (Austral autumn 2000 – summer 2001) within Marlborough Creek, central Queensland, Australia, using pressure-sensitive time–depth recorders. Additionally, diurnal variations in water temperature and aquatic PO2 level, as well as the turtle's behavioural state (i.e., active versus resting), were monitored. In autumn and summer, surfacing frequency increased significantly during the daylight hours, with peak levels normally occurring around dawn (0500–0700) and dusk (1700–1900). However, no consistent diel surfacing trend was recorded for the turtles in winter or spring, owing to considerable variation among individual R. leukops. Diurnal surfacing trends recorded for R. leukops in autumn and summer are attributed to periods of increased activity (possibly associated with foraging) during the daylight hours and not to daily variations in water temperature or aquatic PO2 level. Turtles generally remained at a depth greater than 1 m throughout the day, where the effect of diel fluctuations in water temperature (<0.5 °C) and aquatic PO2 level (<15 mm Hg (1 mm Hg = 133.322 Pa)) was considered to be negligible.

Influences of forested watershed conditions on fluctuations in stream water temperature with special reference to watershed area and forest type

Limnology ◽  
2009 ◽  
Vol 10 (1) ◽  
pp. 33-45 ◽  
Author(s):  
Luki Subehi ◽  
Takehiko Fukushima ◽  
Yuichi Onda ◽  
Shigeru Mizugaki ◽  
Takashi Gomi ◽  
...  
Keyword(s):  
Special Reference ◽  
Water Temperature ◽  
Forest Type ◽  
Stream Water ◽  
Forested Watershed ◽  
Watershed Area

scholarly journals DNA metabarcoding of zooplankton communities: species diversity and seasonal variation revealed by 18S rRNA and COI

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11057
Author(s):  
Lina Zhao ◽  
Xue Zhang ◽  
Mengyue Xu ◽  
Ying Mao ◽  
Yuan Huang
Keyword(s):  
Environmental Factors ◽  
Water Temperature ◽  
Total Nitrogen ◽  
Seasonal Changes ◽  
18S Rrna ◽  
Freshwater Ecosystems ◽  
Influential Factors ◽  
Diversity Assessment ◽  
Dna Metabarcoding ◽  
Sanmenxia Reservoir

Background Zooplankton is an important component of aquatic organisms and has important biological and economical significance in freshwater ecosystems. However, traditional methods that rely on morphology to classify zooplankton require expert taxonomic skills. Moreover, traditional classification methods are time-consuming and labor-intensive, which is not practical for the design of conservation measures and ecological management tools based on zooplankton diversity assessment. Methods We used DNA metabarcoding technology with two different markers: the nuclear small subunit ribosomal RNA (18S rRNA) and mitochondrial cytochrome c oxidase (COI), to analyze 72 zooplankton samples collected in 4 seasons and 9 locations from the Sanmenxia Reservoir. We investigated seasonal changes in the zooplankton community and their relationship with water environmental factors. Results A total of 190 species of zooplankton were found, belonging to 12 phyla, 24 classes, 61 orders, 111 families, and 174 genera. Protozoa, especially ciliates, were the most diverse taxa. Richness and relative abundance of zooplankton showed significant seasonal changes. Both alpha and beta diversity showed seasonal trends: the diversity in summer and autumn was higher than that in winter and spring. The zooplankton diversity was most similar in winter and spring. By correlating metabarcoding data and water environmental factors, we proved that water temperature, chemical oxygen demand, total nitrogen and ammoniacal nitrogen were the main environmental factors driving the seasonal changes in zooplankton in the Sanmenxia Reservoir. Water temperature, followed by total nitrogen, were the most influential factors. This study highlights the advantages and some limitations of zooplankton molecular biodiversity assessment using two molecular markers.

Temporal changes in a demersal fish and cephalopod community of an unexploited coastal area in Northern Australia

1984 ◽  
Vol 35 (6) ◽  
pp. 747 ◽  
Author(s):  
SF Rainer
Keyword(s):  
Water Temperature ◽  
Seasonal Changes ◽  
Fish Community ◽  
Demersal Fish ◽  
Temporal Changes ◽  
Tropical Fish ◽  
Trawl Survey ◽  
Depth Range ◽  
Local Abundance ◽  
Different Seasons

A trawl survey of the south-eastern Gulf of Carpentaria carried out at the beginning of a commercial prawn fishery in the 1960s provided data on the demersal fish of an unexploited tropical fish community. The extent of temporal variation in this community was investigated using abundance data on 359 taxa of fish and cephalopods over 13 months in 1963-1964. Seasonal changes in water temperature and salinity were large, particularly in nearshore waters. Catch rates and species richness in nearshore waters were highest during summer, and in offshore waters during autumn or winter. Shannon diversity was variable, with no clear seasonal component. Temporal changes in community composition resulted in large changes between different seasons in the structure of site groups derived by classification; temporal effects within seasons were also found. The numerically dominant species were the leatherjackets Paramonacanthus spp., the ponyfish Equulites leuciscus, the tripodfish Tripodichthys blochii, and the saury Saurida undosquamis. Squid, the ponyfish Leiognathus sp. nr blochi, the butterfly-bream Nemipterus tolu and the grunter Pomadasys maculatus were seasonally abundant. Although species were restricted in their depth range, discrete communities that maintained their identity in different seasons were apparently absent. The relative abundance of many species varied substantially wirh season and probably also over a longer period. Small changes in local abundance were often associated with movement to deeper water at times of high nearshore water temperature (summer) or of reduced nearshore salinity (autumn). Large seasonal changes occurred in the local abundance of estuarine and semidiadromous species. The community shared many species with the demersal fish community of the Gulf of Thailand. It is suggested that similar structural changes in the fish community of the Gulf of Carpentaria may occur in response to intensive fishing. Further research on the effects of demersal fishing and on the interactions of the demersal fish community with commercially important crustaceans is necessary.

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