. L'écologie de l'estuaire de Tijuana, en Californie : un programme national estuarine research reserve. Écologie estuarienne -- California Tijuana et de l'estuaire de la rivière. Parce que la saison sèche est plus longue que la période d'inondation de l'hiver, conditions existent ; par conséquent, l'habitat s'appelle une panne de sel, plutôt qu'un étang temporaire. La nature éphémère de la phase aquatique, il est difficile d'apprécier la productivité et la complexité de ces communautés. Il est souvent recommandé dans les propositions d'atténuation que le sel pannes être converti à un autre usage, parce que leurs valeurs sont supposés être faible. Très

• Contributeur: The Book Worm / Alamy Banque D'Images
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. The ecology of Tijuana Estuary, California : a national estuarine research reserve. Estuarine ecology -- California Tijuana River Estuary. Because the dry season is longer than the winter inundation period, barren conditions prevail; hence, the habitat is called a salt panne, rather than a temporary tidal pond. The ephemeral nature of the aquatic phase makes it difficult to appreciate the productiv- ity and complexity of these communities. It is often recommended in mitigation proposals that salt pannes be converted to some other use, because their wetland values are assumed to be low. Very little research has been done in salt pannes, so their habitat values have not been quantified. Species that are characteristic of salt pannes have developed adaptations to the extremes of prolonged inundation and high salt accumulation. Many soil-dwelling insects utilize "plastrons, " or air traps, that allow them to respire when the water or soil is anaerobic (Foster and Treherne 1976). In addition, many have developed waterproof integuments and mechanisms for secreting hypertonic rectal fluids to regulate osmotic and ionic balance. Rove beetles (Staphylinidae, Genus Bledius; Figure 3.14) were studied at Tijuana Estuary by Nordby (1984). Several species of these small beetles inhabit complex underground labyrinths that are evidenced at the surface by excavated "middens." The density of middens reaches 500/m2; the tunnels beneath them are about 20 cm in depth. Densities of beetles were highest in March 1984, when 8 adults and 22 juveniles were recorded per 1, 650 cm2 core. Reproduction occurred in the spring with eggs attached to the sides of burrows by means of a clear, threadlike material. Intertidal elevation is the most important physical variable that characterizes rove beetle distribution patterns. They are densest in a narrow belt at about the high tide line. The beetles prefer soil dampened by tidal inundation but not covered by standing water. A typi

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