Gallardo c s (5 risultati)

Condizione: New. Idioma/Language: Español. *** Nota: Los envíos a España peninsular, Baleares y Canarias se realizan a través de mensajería urgente. No aceptamos pedidos con destino a Ceuta y Melilla.

Paperback. Condizione: Brand New. 11.42x8.86x0.08 inches. In Stock. Santolaya Ruiz Clavijo, Antonia; Filella García, Lluís; Labari Ilundain, José Ángel; López Salán, Felipe; Flores Márquez, Enrique; Tejerina Martínez, Germán; Mark, Alya; Munté Vidal, Marta; BRONCO STUDIO SCP,; Luchini, Maximiliano; Aranda I Recasens, Ricard; Gómez Mut, Marina; Balzola Careaga, Sofía; Pérez Navarro, Cristina; Campillo Besses, Susanna; Diáz Pérez Pelorroto, Alberto; Serra Bonilla, Sebastiá; El Bello Quebrado,; Osuna, Rosa; Arumí Casanovas, David; Asensio Moruno, Arturo; Sánchez Marcos, Lydia; García Simavilla, María José; Moreno Arrastio, Félix; Lorenzo De Las Cuevas, Antonio Moisés; Costa Virgili, Marta; Salomó Fisa, Xavier; Berdugo Garvia, Guillermo; Iglesias Ortiz, Beatriz; Lorenzo Diaz, Enrique; Itxart Ros, Inmaculada; Comotto, Agustín; López Gallardo, Pamela (illustratore). …

Populations of Littorina mariae, L. obtusata and L. saxatilis from the coast near Roscoff (Brittany), from the North Sea islands Helgoland and Sylt were investigated with regard to several characters of their reproductive biology. Important factors are body size and weight, maturation size, shell thickness, sex ratio and reproductive effort of adults as well as number, size and mortality of embryos. Mature L. saxatilis individuals inhabiting sandy shores are smaller and have thinner shells and higher reproductive effort than those on rocky coasts. On shores with loose and semipermanent boulders the adults are clearly larger. Interannual variations in some life history parameters may be explained by changes in food supply. In populations with small adults, females are bigger than males. In localities where L. mariae and L. obtusata occur sympatrically, a tendency to accentuate interspecific contrast is recognized. Life history patterns, especially in L. saxatilis populations, show two tendencies: (a) a rapid increase of shell-size and thickness, which offers better chances of survival and of maximizing clutch-size and clutch-numbers during life-time; (b) early entrance into maturity leads to accelerated reproduction, but life expectation is reduced. Both tendencies are balanced by the action of biotic and abiotic factors. 22 pp., 4 figs, 14 tabs, gr. 8.…

Condizione: New.