Complexity of early and middle successional stages in a rocky intertidal surfgrass community

Abstract

A variety of simple models have been proposed to describe ecological succession (e.g., Connell and Slatyer 1977), but these models do not address some agents that may increase complexity. To determine the complexity of a natural sequence, four null hypotheses were tested: (1) seasonality of growth, recruitment, and mortality does not influence succession; (2) the interspecific interactions that produce successional change are the same throughout the sequence; (3) consumers have no influence on succession, and (4) small scale spatial variation in establishment and mortality does not occur. These hypotheses were tested in a low zone rocky intertidal community normally dominated by the surfgrass Phyllospadix scouleri on the Oregon coast.Succession experiments initiated in different seasons and an herbivore exclusion experiment falsified each of these hypotheses. At two sites (Boiler Bay and Squaw Island) experimental plots that were cleared in the spring were first colonized by Ulva sp., but those cleared in other seasons were first colonized by Phaeostrophion irregulare. Ulva appears adapted to colonize space made available by winter storms, whereas Phaeostrophion takes advantage of space made available by sand movement in the fall. Another seasonal pattern was the sharp decline in total algal cover in the fall, when wave action increased. At Squaw Island, the presence of Phaeostrophion established in fall and winter significantly inhibited the summer establishment of Ulva, though Ulva occupied some space epiphytically. In contrast, at Boiler Bay, a different, stronger type of interspecific interaction occurred: Phaeostrophion totally inhibited the establishment of filamentous diatoms. The cover of Ulva in the summer was also influenced by herbivores, but Ulva cover declined in the fall in both herbivore exclusions and controls, suggesting that herbivores were not solely responsible for its replacement. Local variation was demonstrated, because after three years of succession, replicate plots often differed. The early colonists, Phaeostrophion and Ulva, continued to dominate some plots; in other plots they had been replaced by middle successional species, including Cryptosiphonia woodii and Odonthalia floccosa. In still other plots Rhodomela larix had replaced other species. Similarly complex successional sequences occur in many natural communities. Thus, the features that simple models do not address may add complexity to succession, and for some communities different approaches must be developed.

Responses of algae with different life histories to temporal and spatial variability of disturbance in subtidal reefs

“…Dictyota dichotoma a n d Laurencia obtusa, conversely, colonised bare rock throughout the year, although their abundances were generally greater in patches cleared in spring to early autumn months. This temporal variability in the responses of algae to disturbance suggests that it might be possible to predict yearly patterns of abundance of some species from annual variations in the timing of disturbance (see also Turner 1983). For Dictyota dichotoma this hypothesis was supported by consistency of results of this study with results of previous experiments on the same assemblage (Airoldi & Cinelli 1997, Airoldi 1998).…”

Disturbance, interspecific interaction and diversity in metapopulations

“…Finally, the tolerance model supposes that either early or late species can colonize an empty patch, and that the sequence of early to late species is determined by their relative abilities to tolerate the reduction in resource levels that occurs as the populations grow. Gallagher, Jumars & Trueblood (1983) and Turner (1983a) have recently reviewed experimental evidence on successional mechanisms in marine benthic systems. Both facilitation (e.g.…”

Leaf versus root nitrogen uptake by the surfgrass Phyllospadix torreyi

“…These physical differences of the habitat have implications for community processes such as nutrient cycling, community stability and succession (McRoy & Lloyd 1981), and suggest that Phyllospadix beds could be more similar to macroalgae communities than to other seagrass beds. In fact, Phyllospadix is able to compete successfully with macroalgae for space and form communities with high persistence (Turner 1983a, b, 1985, Turner & Lucas 1985.…”