Benthic use of phytoplankton blooms: Agnes M. L. Karlson
... species richness have been proposed (e.g. Lawton 1994). First, the linear, “rivet” hypothesis suggests that all species contribute to ecosystem function (e.g. Lawton 1994). Second, the “redundancy” hypothesis suggests that ecosystems can lose many species with no consequences for their performance, ...
... species richness have been proposed (e.g. Lawton 1994). First, the linear, “rivet” hypothesis suggests that all species contribute to ecosystem function (e.g. Lawton 1994). Second, the “redundancy” hypothesis suggests that ecosystems can lose many species with no consequences for their performance, ...
mammals - The Woodland Trust
... Aside from bats’ foraging needs, the most important resource woodland provides is roosting sites. In historical terms, bats generally fall into two groups: those evolved to roost in caves and those adapted to tree roosts. The relative permanency of caves contrasts with the transient nature of tree r ...
... Aside from bats’ foraging needs, the most important resource woodland provides is roosting sites. In historical terms, bats generally fall into two groups: those evolved to roost in caves and those adapted to tree roosts. The relative permanency of caves contrasts with the transient nature of tree r ...
Ecological Engineering Effects of plant diversity - Everglades-HUB
... 2.2. Evaluation of the experimental plant communities During the experiment, all species mixtures that were planted were still present, except for the one-species mixtures, where these mixtures, individually planted with Thalia dealbata, Cassia tora Linn., Sapindus mukorossi Gaertn., Neyraudia monta ...
... 2.2. Evaluation of the experimental plant communities During the experiment, all species mixtures that were planted were still present, except for the one-species mixtures, where these mixtures, individually planted with Thalia dealbata, Cassia tora Linn., Sapindus mukorossi Gaertn., Neyraudia monta ...
Effects of short-term warming on low and high latitude forest ant
... climatic change than those at high latitudes, ecological communities at low latitudes could be more resilient to environmental change because they are generally more diverse (Wittebolle et al. 2009). Yet, because most experimental studies of the effects of warming have been conducted at single sites ...
... climatic change than those at high latitudes, ecological communities at low latitudes could be more resilient to environmental change because they are generally more diverse (Wittebolle et al. 2009). Yet, because most experimental studies of the effects of warming have been conducted at single sites ...
The Global Decline of Reptiles, Deja Vu Amphibians
... s a group [reptiles] are neit her ‘good ’n or ‘bad,’ but iare interes ting and unu sual, although of minor importance. If they should all disappe ar, it would not make much difference one way or the other ”( Zim and Smith 1953, p. 9). Fortunately, this opinion from the Golden Guide Series does not p ...
... s a group [reptiles] are neit her ‘good ’n or ‘bad,’ but iare interes ting and unu sual, although of minor importance. If they should all disappe ar, it would not make much difference one way or the other ”( Zim and Smith 1953, p. 9). Fortunately, this opinion from the Golden Guide Series does not p ...
Are there general laws in parasite community - MiVEGEC
... given host population. Then the highest level of parasite organization is the suprapopulation which represents all individuals of a given parasite species within an ecosystem. Next, the parasite compound community consists of all the parasite communities within an ecosystem (see Esch et al. 1990). T ...
... given host population. Then the highest level of parasite organization is the suprapopulation which represents all individuals of a given parasite species within an ecosystem. Next, the parasite compound community consists of all the parasite communities within an ecosystem (see Esch et al. 1990). T ...
What does ecological modelling model? A proposed classification of
... somewhat misleading since it is actually the distribution of suitable habitats that is being predicted by the model, rather than the species’ distribution per se (Pearson, 2007). Also, the term ENM refers directly to the ecological niche theory (Guisan and Zimmermann, 2000; Pulliam, 2000; Kearney, 2 ...
... somewhat misleading since it is actually the distribution of suitable habitats that is being predicted by the model, rather than the species’ distribution per se (Pearson, 2007). Also, the term ENM refers directly to the ecological niche theory (Guisan and Zimmermann, 2000; Pulliam, 2000; Kearney, 2 ...
15. NEW WORLD NECTAR-FEEDING VERTEBRATES
... Moreno-Valdez 2000). Within tropical latitudes, seasonal changes in the composition of hummingbird communities occur as a result of both altitudinal and latitudinal migrations. At six well-studied sites in Costa Rica, for example, the proportion of migrant species ranged from 12 to 60 percent (Table ...
... Moreno-Valdez 2000). Within tropical latitudes, seasonal changes in the composition of hummingbird communities occur as a result of both altitudinal and latitudinal migrations. At six well-studied sites in Costa Rica, for example, the proportion of migrant species ranged from 12 to 60 percent (Table ...
Succession: A Closer Look
... The concept of predictable change in vegetation time was next championed by Frederick Clements in the early 1900s. He proposed the concept of a climax state for communities, which represented the final, or permanent, end-stage of succession (Clements 1936). For Clements, climax communities were the ...
... The concept of predictable change in vegetation time was next championed by Frederick Clements in the early 1900s. He proposed the concept of a climax state for communities, which represented the final, or permanent, end-stage of succession (Clements 1936). For Clements, climax communities were the ...
O Salamanders in a Changing Environment on Hemlock Hill Brooks Mathewson
... fragmenters and, subsequently, the surface area of leaf litter available to bacteria and fungi. In addition to being extremely abundant and positioned in the middle of the food web, plethodontid salamanders are good indicators of overall ecosystem health because populations do not fluctuate greatly f ...
... fragmenters and, subsequently, the surface area of leaf litter available to bacteria and fungi. In addition to being extremely abundant and positioned in the middle of the food web, plethodontid salamanders are good indicators of overall ecosystem health because populations do not fluctuate greatly f ...
Conservation Assessment for the Red-Tailed Chipmunk
... chipmunks in Washington. Therefore, I draw on accounts of the species from its entire range. There is no information regarding differences in ecology between the two subspecies. This work should not be considered complete, as unpublished reports of occurrence or ecological information are very likel ...
... chipmunks in Washington. Therefore, I draw on accounts of the species from its entire range. There is no information regarding differences in ecology between the two subspecies. This work should not be considered complete, as unpublished reports of occurrence or ecological information are very likel ...
origins of the azorean intertidal biota: the significance of introduced
... Pico (MORTONet al. 1996). RIDLEY(1930) suggested that the seeds of the seagrass Zoster~z marina can pass through the intestine of the Mallard (Anas platj~rhynchos)and retain their viability. That this is also possible for Ruppia maritima is evidenced by its recent discovery in the isolated, but a de ...
... Pico (MORTONet al. 1996). RIDLEY(1930) suggested that the seeds of the seagrass Zoster~z marina can pass through the intestine of the Mallard (Anas platj~rhynchos)and retain their viability. That this is also possible for Ruppia maritima is evidenced by its recent discovery in the isolated, but a de ...
PDF
... Teelucksingh, 2007), Trinidad, the most appropriate lag length was found to be two years in this system. The relationship between target and bycatch species is negative. If there is an increase in the target species landings, then the landings of bycatch species will fall because the increased morta ...
... Teelucksingh, 2007), Trinidad, the most appropriate lag length was found to be two years in this system. The relationship between target and bycatch species is negative. If there is an increase in the target species landings, then the landings of bycatch species will fall because the increased morta ...
Conservation status of Powerful Owl in New South Wales
... under the National Parks and Wildlife Act 1972 (NPW Act). The species is not listed under Commonwealth legislation. The NSW Scientific Committee recently determined that the Powerful Owl meets criteria for listing as Vulnerable in NSW under the Threatened Species Conservation Act 1995 (TSC Act), bas ...
... under the National Parks and Wildlife Act 1972 (NPW Act). The species is not listed under Commonwealth legislation. The NSW Scientific Committee recently determined that the Powerful Owl meets criteria for listing as Vulnerable in NSW under the Threatened Species Conservation Act 1995 (TSC Act), bas ...
Biodiversity in grasslands: current changes and scenarios for the
... changes. There are various possible scenarios of change in biodiversity for the next century, according to the report by Sala et al. (2000). The report discusses the sensitivity of biomes to the different global changes. They screened five drivers of change: land use; climate; nitrogen deposition; b ...
... changes. There are various possible scenarios of change in biodiversity for the next century, according to the report by Sala et al. (2000). The report discusses the sensitivity of biomes to the different global changes. They screened five drivers of change: land use; climate; nitrogen deposition; b ...
Mammals and Seeds - Plymouth State University
... after the fourth day. It is possible that the small mammal residents were becoming more cautious to the threats of spending increased time in the risky habitat, so they started spending less time in the field. They could have also been more aware of the seeds present in the ecotone and forest and be ...
... after the fourth day. It is possible that the small mammal residents were becoming more cautious to the threats of spending increased time in the risky habitat, so they started spending less time in the field. They could have also been more aware of the seeds present in the ecotone and forest and be ...
Comparison of terrestrial large-mammal communities in Suriname v2
... known to occur in all three localities (Ouboter, pers. obs.), were only found at Raleighvallen during this study. Red Brocket Deer and Paca were much more abundant at Raleighvallen, which is probably also related to palm swamps with many fruiting palms. The savannas in the Coesewijne area are relati ...
... known to occur in all three localities (Ouboter, pers. obs.), were only found at Raleighvallen during this study. Red Brocket Deer and Paca were much more abundant at Raleighvallen, which is probably also related to palm swamps with many fruiting palms. The savannas in the Coesewijne area are relati ...
Herrera.1979.Oikos
... transects 700 m long were walked 6-7 times each per month during the first three hours after sunrise. Observations on feeding-site utilization were carried out during periods of variable length uniformly distributed from sunrise to dusk. Within a given month, observations were made during all times ...
... transects 700 m long were walked 6-7 times each per month during the first three hours after sunrise. Observations on feeding-site utilization were carried out during periods of variable length uniformly distributed from sunrise to dusk. Within a given month, observations were made during all times ...
Ecological niches occupied by in South African rangeland communities Dichapetalum cymosum
... affected. This is mainly due to the high costs associated with control measures such as fencing, supplementary feeding and veterinary expenses, and / or lack of grazing management with livestock numbers exceeding the biological carrying capacity of the rangeland due to lack of grazing lands. Proper ...
... affected. This is mainly due to the high costs associated with control measures such as fencing, supplementary feeding and veterinary expenses, and / or lack of grazing management with livestock numbers exceeding the biological carrying capacity of the rangeland due to lack of grazing lands. Proper ...
Population Dynamics of Pathogens with Multiple Host Species
... changes in the relative intensity of within- versus betweenspecies transmission. I explicitly assume rates of betweenspecies transmission are lower than rates of within-species transmission; this largely reflects the ecological assumption that species tend to have more interactions with individuals ...
... changes in the relative intensity of within- versus betweenspecies transmission. I explicitly assume rates of betweenspecies transmission are lower than rates of within-species transmission; this largely reflects the ecological assumption that species tend to have more interactions with individuals ...
PSHE - Sky Rainforest Rescue
... What’s the number? • One in 10 of the world’s species can be found in the Amazon rainforest. • The Amazon rainforest covers 6.7 million square kilometres. • 40,000 plant species have been discovered in the rainforest. • 3 million indigenous people living in the Amazon rainforest. ...
... What’s the number? • One in 10 of the world’s species can be found in the Amazon rainforest. • The Amazon rainforest covers 6.7 million square kilometres. • 40,000 plant species have been discovered in the rainforest. • 3 million indigenous people living in the Amazon rainforest. ...
the Wildlife Packet
... adapted, and in many cases, become specialized to use a certain location or time of day for their hunting or food gathering to avoid excessive competition. When animals use different layers of a habitat it is called stratification of niches, or resource partitioning. An example would be warblers, wh ...
... adapted, and in many cases, become specialized to use a certain location or time of day for their hunting or food gathering to avoid excessive competition. When animals use different layers of a habitat it is called stratification of niches, or resource partitioning. An example would be warblers, wh ...
Ruesink.pps
... gigas) introduced to Washington State? – Harvesting native oysters was no longer economical… but therein lies a story ...
... gigas) introduced to Washington State? – Harvesting native oysters was no longer economical… but therein lies a story ...
Impact of prescribed burning on endophytic insect
... of 5–30 Silphium stems per site. Although only the remains of burned stems were collected, insects emerging from them nevertheless represented the total number of survivors of the entire stem. We sectioned stems to fit within individual food storage bags (3.8 L volume), and stored these bags in an u ...
... of 5–30 Silphium stems per site. Although only the remains of burned stems were collected, insects emerging from them nevertheless represented the total number of survivors of the entire stem. We sectioned stems to fit within individual food storage bags (3.8 L volume), and stored these bags in an u ...
Bifrenaria
Bifrenaria, abbreviated Bif. in horticultural trade, is a genus of plant in family Orchidaceae. It contains 20 species found in Panama, Trinidad and South America. There are no known uses for them, but their abundant, and at first glance artificial, flowers, make them favorites of orchid growers.The genus can be split in two clearly distinct groups: one of highly robust plants with large flowers, that encompass the first species to be classified under the genus Bifrenaria; other of more delicate plants with smaller flowers occasionally classified as Stenocoryne or Adipe. There are two additional species that are normally classified as Bifrenaria, but which molecular analysis indicate to belong to different orchid groups entirely. One is Bifrenaria grandis which is endemic to Bolívia and which is now placed in Lacaena, and Bifrenaria steyermarkii, an inhabitant of the northern Amazon Forest, which does not have an alternative classification.