|
|
|
|
|
| Marazzo,Andrea; Valentin,Jean Louis. |
| Populations of Pseudevadne tergestina were studied in Guanabara Bay, southeastern Brazil, to assess temporal variations in density and population dynamics. Data on temperature, salinity and zooplankton samples were taken from the superficial water of a fixed station, every 3 - 4 days, from February 2 through August 1, 2000. The highest abundance of this species was observed in March, when densities varied widely, from 20 to 600 ind. m-3. Population parameters were calculated, such as birth rate (from 0.25 to 0.90 ind.-1.day-1), growth rate (from -1.30 to 2.09 day-1 ) and death rate ( from -1.6 to 1.9 day-1 ) Start of population could be attributed to the increase of temperature and to the hatching of resting eggs. The population collapsed in fall-winter,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zooplankton; Cladocera; Population parameters; Temporal distribution; Guanabara bay; Brazil. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000500006 |
| |
|
| |
|
|
| De Casamajor, Marie-noelle; Derrien-courtel, Sandrine; Lalanne, Yann; Maria Gorostiaga, José; Le Gal, Aodren; Huguenin, Laura; Quintano, Endika; Lissardy, Muriel. |
| Cystoseira baccata, a biological quality element for the implementation of the Water Framework and Marine Strategy EU Directives, is a dominant species in the subtidal rocky bottoms of the Basque coast. As part of this issue and given the need to better understand the functional character of benthic rocky ecosystems and use them as a reference to anthropogenic changes, two samplings campaigns were conducted in 2014 and 2017. Several population parameters (i.e. frond density, frond length frond-length/total frond-length ratio and taxonomic richness of epibionts) of C. baccata were studied from three sites monitored within the Water Directive Framework in relation to bathymetry during the two campaigns. The results showed a significant influence of... |
| Tipo: Text |
Palavras-chave: Bathymetry; Cystoseira baccata; Epiphytes; Foundation species; Population parameters; Water framework directive. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00500/61151/64581.pdf |
| |
|
| |
|
| |
|
|
| Bergmans, M.. |
| Caswell and Hastings (1980) introduced an explicit model for the relative merits, in terms of growth rate <i>lambda</i>, of developmental shifts vs. fecundity increases. Some aspects of their model are clarified by concentrating on the (fitness >1) half-plane rather than on the (accelerated reproduction) half-plane. There is no strict equivalence between Caswell and Hastings' key parameter <i>lambda/P</i> and the dynamic behaviour of the population which is governed by <i>lambda</i>. Thus in some stationary/declining populations time shifts of reproduction (forward or backward, according to the value of <i>lambda/P</i>) are just as effective in promoting a high <i>lambda</i> as they are in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Population parameters. |
| Ano: 1983 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3364 |
| |
|
|
|
