A5048090589- Crustacean biology and ecology
- Marine and fisheries research
- Species Distribution and Climate Change
- Ecology and Vegetation Dynamics Studies
- Plant and animal studies
- Animal Ecology and Behavior Studies
- Wildlife Ecology and Conservation
- Marine Biology and Ecology Research
- Coral and Marine Ecosystems Studies
- Fish biology, ecology, and behavior
- Sustainability and Ecological Systems Analysis
- Ecology and biodiversity studies
- Fish Biology and Ecology Studies
- Statistical Methods and Applications
- Animal Behavior and Reproduction
- Parasite Biology and Host Interactions
- Environmental, Ecological, and Cultural Studies
- Conservation, Biodiversity, and Resource Management
- Insect and Arachnid Ecology and Behavior
- Conservation, Ecology, Wildlife Education
- Genetically Modified Organisms Research
- Ichthyology and Marine Biology
- Evolutionary Game Theory and Cooperation
- Banana Cultivation and Research
- Complex Systems and Decision Making
York University
2010-2024
University of Toronto
1996-2003
Freshwater crayfish are amongst the largest macroinvertebrates and play a keystone role in ecosystems they occupy. Understanding global distribution of these animals is often hindered due to paucity distributional data. Additionally, non-native introductions becoming more frequent, which can cause severe environmental economic impacts. Management decisions related their habitats require accurate, up-to-date data mapping tools. Such currently patchily distributed with limited accessibility...
The distribution of biodiversity at multiple sites a region has been traditionally investigated through the additive partitioning regional into average within-site and among sites. standard diversity requires use measure diversity, which is concave function relative abundance species, such as Gini-Simpson index, for instance. Recently, it was noticed that widely used index does not behave well when number species very large. objective this paper to show new weighted preserves qualities...
Leading invasion biologists sometimes dismiss critics and criticisms of their field by invoking "the straw man" fallacy. Critics biology are also labelled as a small group "naysayers" or "contrarians", who engaging in "science denialism". Such unfortunate labels can be seen way to possibly suppress legitimate debates minimize reasonable concerns about some aspects biology, including the uncertainties geographic origins complex environmental impacts species, control programs against species...
Abstract During agonistic contests between size-matched Cambarus robustus crayfish males of breeding form, the eventual winners and losers initiated approximately same number fights. However, differed in frequencies types initiation behaviours used. The used almost exclusively more subtle Ambivalent Contact behaviours, whereas primarily aggressive Lunge Claws Raised behaviours. vast majority (81.5%) very first fights overall contests. type by these from beginning allows us to predict status...
In this study, we evaluate the aggressive interactions between breeding form (Form I) and non-breeding II) male crayfishes, Cambarus robustus, during inter-form contests, compare these data to those from previous studies on intra-form contests in species. The analysis of agonistic size-matched crayfishes showed that Form I males were clearly dominant, most cases, over II males. Furthermore, performed significantly more Lunge Claws Raised initiation behaviors than contests. These two strongly...
Shannon's entropy and Simpson's index are the most used measures of species diversity. As Simpson proves to be just an approximation Shannon entropy, conditional indices diversity a global measure interdependence among introduced, similar those in corresponding entropic formalism from information theory. Also, since both depend only on number relative abundance respective given ecosystem, paper generalizes these case when numerical weight is attached each species. Such could reflect...
The Gini-Simpson quadratic index is a classic measure of diversity, widely used by ecologists. As shown recently, however, this not suitable for the measurement beta diversity when number species very large. objective paper to introduce Rich- which preserves all qualities but behaves well even additive partitioning using Rich-Gini- Simpson and an application from island biogeography are analyzed.
The distribution of biodiversity at multiple sites a region has been traditionally investigated through the additive partitioning regional biodiversity, called γ-diversity, into average within-site or α-diversity, and among sites, β-diversity. standard diversity requires use measure which is concave function relative abundance species, like Shannon entropy Gini- Simpson index, for instance. When phylogenetic distance between species also taken account, Rao's quadratic index used as...
Abstract The concept of native range in invasion biology is difficult to define since, many cases, this type unknown and cannot be determined. We investigate the uncertainties related by focusing on distribution Faxonius rusticus (Girard, 1852), also known as rusty crayfish, which perceived possibly worst invasive crayfish species North America. In study, we undertake a comprehensive literature review, includes 430 studies published between 1852 2018, order analyze introduced ranges species....
ABSTRACT This comprehensive update of the distribution crayfishes genera Cambarus and Fallicambarus in Ontario includes substantial material collected since 1965 a reexamination previous records. Revised provincial range limits are presented for two wide-ranging, openwater species, C. bartonii robustus, as well 2 obligate burrowers more restricted distribution, diogenes F. fodiens. Previously unreported locality records represent extensions, fill geographic gaps known ranges, or confirm...
The crayfish genus Fallicambarus Hobbs, 1969 contains 16 species. All of these are semi-terrestrial burrowers found in the eastern half North America. A total 75% species is currently endangered, threatened, or vulnerable, and therefore, require special attention from a conservation standpoint. most widely distributed this genus, fodiens (Cottle, 1863), also vulnerable certain parts its overall range. information available about little-known crayfishes reviewed order to raise awareness...
[The crayfish genus Cambarus Erichson, 1846 contains 97 species found in a wide diversity of freshwater aquatic and semi-aquatic habitats eastern central regions North America. The greatest this is the south-eastern areas United States, particularly states such as Tennessee, Georgia, Carolina, Alabama. About half (47.42%) all are either endangered, threatened, or vulnerable. Therefore, these require special attention from conservation standpoint. Habitat destruction degradation main threats...
The weighted Gini-Simpson quadratic index is the simplest measure of biodiversity which takes into account relative abundance species and some weights assigned to species. These could be based on factors such as phylogenetic distance between species, or their conservation values, even richness vulnerability habitats where these live. In vast majority cases measured are supposed independent, means that proportion a pair product proportions component making up respective pair. first section...
[Informal observation suggested that Fallicambarus fodiens, which lives in close aggregations of mud burrows, exhibits less aggression than related epigean Cambarus spp. Interactions between size-matched, same sex pairs F. fodiens were analysed the laboratory. The analysis shows these crayfish use behaviours similar to those used by initiating agonistic interactions. However, approximately 84% such interactions never proceed point physical contact two opponents, whereas almost all comparable...
A study of the osteology Acanthuridae (surgeonfishes) and a cladistic analysis 42 osteological external characters resulted in well-corroborated hypothesis (consistency index = 0.96) phylogenetic relationship six recognized acanthurid genera. Removal autapomorphies for terminal taxa data matrix 20 characters, consistency 0.91, same phylogeny. Character polarity was determined using outgroup method. Zanclus, Luvarus, Siganidae were selected as first, second, third outgroups, respectively....
Abstract. The vast majority of tested juvenile crayfish Fallicambarus fodiens consistently preferred conspecific‐built mud chimneys over similar‐looking human‐built chimneys. When the were surrounded by transparent acetate sheets, no longer discriminated between and This suggests that visual cues not important in allowing to discriminate two chimney types. In absence chimneys, significantly more showed an initial preference for saturated with water had contained conspecifics, similar...
Both the weighted entropy, which generalizes Shannon and quadratic index, Gini-Simpson are used for getting a unified treatment of some diversity measures proposed recently in ecology. The weights may reflect ecological importance, rarity, or economic value species from given habitat. measures, being concave functions, be additive partition diversity. index has special advantage over entropy because its maximum simple analytical formula allows us to introduce normed measure dissimilarity...
Abstract An analysis of intra-form agonistic contests between size-matched male Form II (non-breeding form) Cambarus robustus Girard, 1852 crayfish revealed that the winners and losers these differed in numbers types initiation behaviours used. The (eventual) winners, which initiated significantly more fights overall, used mostly aggressive Claws Raised Lunge behaviours, whereas losers, also most very first overall contests, tentative Ambivalent Contact behaviour. Thus, can be as good...
Abstract During contests between evenly size-matched Cambarus bartonii crayfish males of reproductive form (Form I), the eventual winners performed significantly more total initiation acts, Lunge and Claws Raised behaviours than losers. There were no significant differences numbers Ambivalent Contact acts tail flip escape behaviours, respectively, by intraspecific, intra-form contests, C. b. Form I used same three main types as closely related species robustus. The highly aggressive act...