نتایج جستجو برای: rocky shores
تعداد نتایج: 8872 فیلتر نتایج به سال:
The design and analysis of manipulative experiments is a key skill for undergraduate ecologists to learn. Despite this, students rarely conduct a true manipulative experiment with appropriate control treatments in the field, because of practical constraints such as time. Meaningful ecological experiments typically require months to obtain results, as well as constant maintenance and attention; ...
Rhizocephalan cirripedes are a very unique group of parasites infecting decapod crustaceans, but apart from few well-studied species, little is known on their ecology and impact hosts. Here we report the results 14-month study infestations rhizocephalan Parasacculina leptodiae in rocky shore crab Leptodius exaratus along shores Kuwait Persian (Arabian) Gulf. Monthly samples an intertidal gradie...
The effect of different stages of the tidal cycle, weather conditions and the presence of conand allo-specifics on the time and activity budgets of Eurasian Oystercatchers Haematopus ostralegus was investigated. Data were collected at a breeding site on Lundy Island in the Bristol Channel, UK, where Oystercatchers feed on limpets Patella spp. on rocky shores. Sixteen behaviours were recorded fo...
Mussels rely on a strong byssal attachment to persist in a range of habitats with differing rates of water flow. Recent studies, however, suggest that the ability of one mussel species to sense and respond adaptively to the flow in its environment is limited under even modest flow conditions because the process of byssal thread formation is disrupted. This study extends these findings to four m...
Gastropod assemblages from nearshore rocky habitats were studied over large spatial scales to (1) describe broad-scale patterns in assemblage composition, including patterns by feeding modes, (2) identify latitudinal pattern of biodiversity, i.e., richness and abundance of gastropods and/or regional hotspots, and (3) identify potential environmental and anthropogenic drivers of these assemblage...
Latitudinal gradients in species abundance and diversity have been postulated for nearshore taxa but few analyses have been done over sufficiently broad geographic scales incorporating various nearshore depth strata to empirically test these gradients. Typically, gradients are based on literature reviews and species lists and have focused on alpha diversity across the entire nearshore zone. No ...
The Pacific oyster, Crassostrea gigas (Thunberg), is the main bivalve species cultivated in the world. With global warming enabling its reproduction and larval survival at higher latitudes, this species is now recognized as invasive and creates wild oyster reefs globally. In this study, the spatial distribution of photosynthetic assemblages colonizing the shells of wild C. gigas was investigate...
Although consumers can strongly influence community recovery from disturbance, few studies have explored the effects of consumer identity and density and how they may vary across abiotic gradients. On rocky shores in Maine, recent experiments suggest that recovery of plant- or animal- dominated community states is governed by rates of water movement and consumer pressure. To further elucidate t...
Group living is ubiquitous, yet causal explanations are not fully tested. Evidence for a reduction in predation risk is clear, and there is support for reduction of risk from the abiotic environment. Potential reproductive benefits are less well understood, especially for non-lekking, externally fertilising animals which form medium-term aggregations. We used Patella vulgata to test the model t...
The ecological consequences of human-driven overexploitation and loss of keystone consumers are still unclear. In intertidal rocky shores over the world, the decrease of keystone macrograzers has resulted in an increase in the dominance of herbivores with smaller body (i.e., "mesograzers"), which could potentially alter community assembly and structure. Here, we experimentally tested whether me...
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