Understanding and predicting how regional to global scale processes affect macroalgal populations and communities requires elucidating the mechanisms underlying observed patterns. This dissertation identifies some of the underlying mechanisms that produce complex multi-scale responses of macroalgae across space and time by delineating the role of key local environmental drivers and...
Human actions are pushing natural systems into states that have no historical precedent. In response, empirical and theoretical researchers are increasingly focused on developing ways to predict the responses of ecological systems to change. However, significant knowledge gaps remain, often leading to “ecological surprises” where observed impacts of global change...
The multifaceted role of the environment in regulating the structure and dynamics of biological communities has long fascinated ecologists and motivated much debate and research. Now, in a time of accelerated global changes due to human impacts, the need to understand how the environment shapes communities has gained new urgency....
Oceanic uptake of rising anthropogenic CO₂ emissions has caused the emergence
of ocean acidification as a major threat to marine ecosystems worldwide. Along eastern
boundary current systems, seawater is naturally acidified due to coastal upwelling of low
pH seawater from depth. Compounded by ocean acidification, upwelling regions are
Ocean Acidification (OA) has emerged as a major threat to marine ecosystems, particularly regarding calcifying organisms. A growing body of literature describing laboratory investigations into pH stress indicates broadly deleterious effects for calcifiers, but responses vary greatly across taxa and can be influenced by variations in other environmental characteristics. Scaling...
The influence of the physical environment on organisms has long been a subject of ecological research. But, the complex drivers of environmental variation, and the multiple scales at which this can occur, make studying this topic a difficult challenge. In rocky intertidal habitats, oceanographic- and climate-scale variability influence benthic communities...
The interaction between the acmaeid limpet, Collisella instabilis
and the subtidal laminarian, Pterygophora californica involves positive
effects on the limpet population and subtle positive or null effects on
the kelp. Collisella, which is found only on Pterygophora and another
kelp, Laminaria dentigera (Kjellman, 1889), may exploit several features
I studied the feeding behavior of marked individuals of the
carnivorous marine snail Thais melones in a rocky shore habitat of
Pacific Panama. The population of snails consume a variety of
invertebrate species such as bivalves, limpets, and polychaetes.
Individuals exhibited a range of diet breadth, with some
Succession and organization of rocky intertidal zone surfgrass beds
(Phyllospadix scouleri Hook) were examined experimentally at two sites
on the Oregon coast. The interaction of three attributes of the plant
-- high persistence, high preemption, and slow recovery -- strongly
influences the organization of surfgrass beds. Permanent plots indicate
Gradients of physical disturbance are central to
theories of community organization yet rarely are studies
performed in which physical factors are experimentally
manipulated. Pothole tidepool algal communities exhibit
distinct zonation patterns from top to bottom that result
from scouring by rocks and other debris in the pools.
Scouring is easily...