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963 results for “Gobies”
FIGURE 17 in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 17. Suborbital rows of sensory papillae in genus Silhouettea with suborbital sensory papillae row b ends anteriorly below anterior edge of eye.
FIGURE 19 in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 19. The example of suborbital sensory papillae row a with many transversal rows in Pomatoschistus minutus. Row a marked, material stained. Photo and modifications by M. Kovačić.
FIGURE 16 in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 16. Suborbital rows of sensory papillae with absent transverse rows and only longitudinal rows in Buenia massutii. Drawing by M. Kovačić.
FIGURE 15. Suborbital row c in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 15. Suborbital row c with irregular transversal proliferations in Papillogobius melanobranchus marked with grey arrow. Photo and modifications by M. Kovačić.
FIGURE 18 in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 18. Anterior oculoscapular head canal ends in interorbit with paired pore λ in Knipowitschia panizzae. Material stained. Photo and modifications by M. Kovačić.
FIGURE 14 in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 14. Anterior oculoscapular head canal in genus Aulopareia with pore α large, elongate, slit like, extending posteriorly from the posteroventral margin of the eye. Drawing by M. Kovačić.
FIGURE 11. A in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 11. A) Snout slightly larger than eye diameter in Lebetus patzneri and B) snout clearly shorter than eye diameter in L. guilleti. Material stained. Photos by M. Kovačić.
FIGURE 10. A in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 10. A) Head anterior oculoscapular canal, posterior oculoscapular canal and preopercular canal present; B) Head anterior oculoscapular canal and preopercular canal present, posterior oculoscapular canal absent; C) Head anterior oculoscapular canal present, preopercular canal and posterior oculoscapular canal absent; D) Head canals absent. Drawing by M. Kovačić.
FIGURE 12 in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 12. Suborbital rows of sensory papillae with absent transverse rows and only longitudinal rows in genus Lesueurigobius. Material stained. Photo by M. Kovačić.
FIGURE 7 in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 7. Dorsal and anal fins confluent with caudal fin in Trypauchen vagina. Drawing by M. Kovačić..
FIGURE 4. Pelvic fins A in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 4. Pelvic fins A) almost completely separated, B) -D) pelvic fins united in pelvic disc. Pelvic disc B) rounded, C) truncate and D) emarginate. Pelvic disc emargination: (a) the shortest branches of fifth branched ray measured from the base of the fifth ray and (b) the longest branches of fourth branched rays measured from the base of the fourth ray, emargination (e) calculated as e=(b-a)/b. Drawing by M. Kovačić.
FIGURE 1 in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 1. The terminology and position of A) head canal with pores and of B) papillae rows of lateral-line system in the present keys. A) Head anterior oculoscapular canal pores σ¹, σ, λ, κ, ω, α, β, ρ; posterior oculoscapular canal pores ρ1, ρ2; preopercular canal pores γ, δ, ε. B) Rows of sensory papillae: preorbital: r, s1, s2, s3, c1, c2, c, c; suborbital: a, b, c (if more 1 2 transversal c rows present: c1, c2, c3, c4, c5, c6 commonly just marked with numbers: 1, 2, 3, 4, 5, 6, 7), d; preoperculomandibular: e, i, f; oculoscapular: x1, x2, tra, trp, z, q, y, as1, as2, as3, la 1, la 2; opercular: ot, os, oi; anterior dorsal: n, o, g, m, h; interorbital: p. Drawing by M. Kovačić.
FIGURE 8 in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 8. The example of the first dorsal fin with two spines in Crystallogobius linearis. Material stained. Photo by M. Kovačić.
FIGURE 3 in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 3. The squamation characters used in the key with marked areas where the presence of scales should be checked. The example of (a) partially scaled cheek and completely scaled (b) opercle, (c) predorsal area, (d) the base of the first dorsal fin between spine I and spine VI and (e) the base of the second dorsal fin between the first spine and the last ray. Photo and modifications by M. Kovačić.
FIGURE 2 in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 2. The count of scales in lateral series marked as pale stripe. Photo and modifications by M. Kovačić.
FIGURE 5. Pelvic disc anterior membrane A in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 5. Pelvic disc anterior membrane A) absent, B) and C) present. Pelvic disc anterior membrane B) without lateral lobes and C) with lateral lobes. Absence of anterior membrane in A), presence of anterior membrane in B) and lateral lobe in C) marked with grey arrow. Pelvic disc anterior membrane height (a) in midline and the length of spinous ray (b) in red. Drawing by M. Kovačić.
FIGURE 6 in Checklist of gobies (Teleostei: Gobiidae) of the Mediterranean Sea and a key for species identification
FIGURE 6. Head canals with additional pore σ¹ on the snout of Oxyurichthys petersi. Drawing by M. Kovačić.
Data from: Effects of elevated carbon dioxide on male and female behavioural lateralisation in a temperate goby
Behavioural abnormality in fishes has been proposed as a significant threat of the increasing levels of carbon dioxide occurring in the oceans. Negative effects of elevated CO2 have been reported for behaviours such as predator-prey interactions, foraging, hearing and behavioural lateralisation. Importantly, the effects vary greatly both within and between species, and some recent studies have shown minimal effects of CO2 on behaviour. Whether the effect of CO2 also varies between males and females is however virtually unexplored. According to resource allocation theory, females are expected to be more sensitive to elevated CO2, meaning that non-sex specific studies may overlook ecologically important differences between the sexes. In this study, we investigated the possible differences between males and females in their response to elevated CO2 by performing behavioural lateralisation tests in adult temperate two-spotted gobies Gobiusculus flavescens. We found that the strength of the side bias (absolute lateralisation) was unaffected by the CO2 treatment, and there was no difference between males and females. The control fish were slightly right-biased in their behavioural asymmetry (mean relative lateralisation of 14). Exposure to high CO2 affected this pattern, such that treated fish were slightly left biased (mean relative lateralisation of -10), regardless of their sex. The same results were obtained yet again when the study was repeated during a second year. We discuss our results in light of the great variation in lateralisation that has been reported to depend on variables such as species, ecological settings and environmental factors.
Data from: Invasion strategies in round goby (Neogobius melanostomus): is bigger really better?
Few studies have systematically investigated mid- or long-term temporal changes of biological characteristics in invasive alien species considering the different phases of an invasion. We studied the invasion performance of one of the most invasive species worldwide, the round goby Neogobius melanostomus, from total absence over first occurrence until establishment from 2010 to 2015 in the upper Danube River. After an upstream movement of the invasion front of about 30 river km within four years, the pattern that round goby pioneering populations significantly differ from longer established ones has been confirmed: Pioneering populations at the invasion front comprised more females than males, and adult specimens with a larger body size compared to those at longer inhabited areas. On the population-level, the proportion of juveniles increased with time since invasion. The results of this study provide support for the previously postulated ´bigger is better´ and ´individual trait utility´ hypotheses explaining invasion success in round goby. Pioneering invaders with their greater exploratory behavior, highly adaptive phenotypic plasticity and increased competitive ability seem to act as prime emperors of new habitats, strongly following and benefiting from man-made river-bank structures.
Data from: Through the eye of a Gobi khulan – application of camera collars for ecological research of far-ranging species in remote and highly variable ecosystems
The Mongolian Gobi-Eastern Steppe Ecosystem is one of the largest remaining natural drylands and home to a unique assemblage of migratory ungulates. Connectivity and integrity of this ecosystem are at risk if increasing human activities are not carefully planned and regulated. The Gobi part supports the largest remaining population of the Asiatic wild ass (Equus hemionus; locally called "khulan"). Individual khulan roam over areas of thousands of square kilometers and the scale of their movements is among the largest described for terrestrial mammals, making them particularly difficult to monitor. Although GPS satellite telemetry makes it possible to track animals in near-real time and remote sensing provides environmental data at the landscape scale, remotely collected data also harbors the risk of missing important abiotic or biotic environmental variables or life history events. We tested the potential of animal born camera systems ("camera collars") to improve our understanding of the drivers and limitations of khulan movements. Deployment of a camera collar on an adult khulan mare resulted in 7,881 images over a one-year period. Over half of the images showed other khulan and 1,630 images showed enough of the collared khulan to classify the behaviour of the animals seen into several main categories. These khulan images provided us with: i) new insights into important life history events and grouping dynamics, ii) allowed us to calculate time budgets for many more animals than the collared khulan alone, and iii) provided us with a training dataset for calibrating data from accelerometer and tilt sensors in the collar. The images also allowed to document khulan behaviour near infrastructure and to obtain a day-time encounter rate between a specific khulan with semi-nomadic herders and their livestock. Lastly, the images allowed us to ground truth the availability of water by: i) confirming waterpoints predicted from other analyses, ii) detecting new waterpoints, and iii) compare precipitation records for rain and snow from landscape scale climate products with those documented by the camera collar. We discuss the added value of deploying camera collars on a subset of animals in remote, highly variable ecosystems for research and conservation.
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