scholarly journals Seasonal variations of species composition and abundance of zooplankton in Ehoma Lake, a floodplain lake in Nigeria

2009 ◽  
Vol 58 (1) ◽  
Author(s):  
Okechukwu. I. Okogwu
Keyword(s):  
Species Composition ◽  
Seasonal Variations ◽  
Floodplain Lake

scholarly journals Seasonal variations in biomass and species composition of seaweeds along the northern coasts of Persian Gulf (Bushehr Province)

2012 ◽  
Vol 121 (1) ◽  
pp. 241-250 ◽  
Author(s):  
A DADOLAHI-SOHRAB ◽  
M GARAVAND-KARIMI ◽  
H RIAHI ◽  
H PASHAZANOOSI
Keyword(s):  
Species Composition ◽  
Seasonal Variations ◽  
Persian Gulf

scholarly journals Seasonal Changes in Bird Assemblages of a Forest-Steppe Ecotone in North Patagonia

2018 ◽  
Author(s):  
Víctor R. Cueto ◽  
Cristian A. Gorosito
Keyword(s):  
Species Composition ◽  
Seasonal Variations ◽  
Bird Species ◽  
Abundant Species ◽  
Species Level ◽  
Forest Steppe ◽  
Total Abundance ◽  
Long Distance ◽  
North Patagonia ◽  
Different Seasons

AbstractWe evaluate seasonal variations at the community level, analyzing changes in species richness, species composition and total abundance, and at the species level, evaluating differences in breeding and molting seasonality among bird species in a forest-steppe ecotone of north Patagonia. The bird assemblage showed a low seasonal variation in richness and total abundance, but a great change in species composition between spring-summer and fall-winter. The change in species composition promoted few seasonal variations in richness and total abundance, because they were compensated by the presence of abundant species that visit the area in different seasons. At the species level, resident birds and short distance migrants tended to begin breeding earlier than long distance migrants, and birds began to molt body and flight feathers after breeding. Therefore, we found a low overlap of these two demanding activities. Our results highlight the importance of bird movements in response to seasonal variations in the availability of resources, which promote migration or local displacements of birds.Resumen. Cambios estacionales en los ensambles de aves en un ecotono bosque-estepa del norte de PatagoniaEvaluamos las variaciones estacionales a nivel comunitario, analizando la riqueza de especies, la composición de especies y la abundancia total, y a nivel de las especies, evaluando las diferencias en la estacionalidad reproductiva y de muda entre las especies de aves en un ecotono bosque-estepa del norte de Patagonia. El ensamble de aves mostró pocas variaciones estacionales en la riqueza y abundancia total, pero un notable cambio en la composición de especies entre la primavera-verano y el otoño-invierno. El cambio en la composición de especies promovió pocas variaciones estaciones en la riqueza y la abundancia total, porque fueron compensadas por la abundancia de las especies que visitan el área en las diferentes estaciones. A nivel de las especies, las aves residentes y migrantes de corta distancia tendieron a comenzar la reproducción antes que las migrantes de larga distancia, y las aves comenzaron la muda de plumas del cuerpo y del ala al finalizar la reproducción. Por lo cual encontramos una baja superposición de estas dos demandantes actividades. Nuestros resultados remarcan la importancia del movimiento de las aves en respuesta a las variaciones en la disponibilidad de recursos, que promueven la migración o el desplazamiento local de las aves.

scholarly journals Spatial and temporal variations of tintinnids (Ciliata: Protozoa) in the Bay of Mersin, Northeastern Mediterranean Sea

2019 ◽  
Vol 20 (2) ◽  
pp. 342 ◽  
Author(s):  
SEVIM POLAT ◽  
TUBA TERBIYIK KURT ◽  
SÜLEYMAN TUĞRUL
Keyword(s):  
Species Composition ◽  
Seasonal Variations ◽  
Dominant Species ◽  
Trophic State ◽  
Trophic Status ◽  
Temporal Variations ◽  
Species Number ◽  
Entire Study ◽  
Species Numbers ◽  
Entire Study Area

Seasonal variations in species composition and abundance of tintinnids were investigated in the eutrophic coastal and offshore waters of Mersin Bay. Twelve sampling cruises were performed from September 2008 to February 2011. A total of 85 tintinnid taxa were identified. Among the recorded genera, agglutinated Tintinnopsis had the largest number of species (12 species), followed by hyaline loricated Eutintinnius (9 species), and Proplectella (7 species). Stenosemella ventricosa, Tintinnopsis beroidea, T. compressa, Favella azorica, and Helicostemella subulata were the dominant species during the study period. There were clear seasonal variations in species composition and abundance of tintinnids. The highest number of tintinnid species occurred in January 2009 and November 2010 in the entire study area, while the lowest species number occurred in March 2009. Morever, species numbers were higher in offshore stations than coastal stations. Some species were present in the coastal area of the bay, and other species were present offshore. The highest tintinnid abundance values were found in September 2008 (820 ind L-1) and August 2009 (749 ind L-1) at coastal stations. The high abundance values in the coastal stations indicates that an increase of tintinnids is closely related to trophic status of the marine environment. In connection with these results, correlation analysis revealed that chlorophyll-a had an important effect on tintinnid abundance. Tintinnid communities may be used as a potential bio-indicator for assessing the trophic state of the coastal seas and bays. 

High Annual and Seasonal Variations in Malaria Transmission by Anophelines and Vector Species Composition in Dielmo, a Holoendemic Area in Senegal

1997 ◽  
Vol 56 (3) ◽  
pp. 247-253 ◽  
Author(s):  
Didier Fontenille ◽  
Lassana Konate ◽  
Nafissatou Diagne ◽  
Jean-Jacques Lemasson ◽  
Mathurin Diatta ◽  
...  
Keyword(s):  
Species Composition ◽  
Malaria Transmission ◽  
Seasonal Variations ◽  
Vector Species

scholarly journals Seasonal variations in species composition of fish assemblage collected by trammel net in coastal waters of the East Sea

2012 ◽  
Vol 48 (4) ◽  
pp. 415-427 ◽  
Author(s):  
Kwang Ho Choi ◽  
Moon Hee Han ◽  
Chang-Keun Kang ◽  
Joo Myun Park ◽  
Jung Hwa Choi ◽  
...  
Keyword(s):  
Species Composition ◽  
Seasonal Variations ◽  
Coastal Waters ◽  
Fish Assemblage ◽  
East Sea
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